30,000 words on water quality

Rosie Nelson – Masters Student

Rosie, geared up for outdoor working - copyright NYMNPAI have finally finished my research masters. All that stands between me and the real world is corrections and actually printing a 30,000 (ish) word document. So did I actually achieve anything. Well I’d like to think so, but first up I’ll tell you a bit about what I did, and how I did it.

I spent six blissful months walking three beautiful watercourse catchments in the North York Moors – Toad Beck, Danby Beck and Great Fryup Beck which are all tributaries into the River Esk. Aside from sun kissed skin and being chased by sheep, dogs and cows, I somehow managed to collect what I was after – a lot of useful data. To establish the water quality of a river a variety of sampling techniques is required. My favourite was using a probe which measures dissolved oxygen, conductivity, pH, salinity, temperature and much much more. Imagine, dangling a very expensive cable off the side of a bridge and waiting in anticipation for the numbers on the screen to settle. I loved it. Although once or twice the probe did ricochet off rocks to produce an alarming sound.

As my data collection evolved, I also started to gather water samples to take back to the laboratory for COD, BOD, DOC, anion and cation analysis. You might think I’ve just put some letters together to appear clever, but they do actually stand for things:
– COD is chemical oxygen demand (amount of oxygen required to oxidise the organic matter in the solution);
– BOD is biochemical oxygen demand (amount of dissolved oxygen being used by aerobic microorganisms when decomposing the organic matter in the solution);
– DOC is dissolved organic carbon (amount of organic matter in the solution);
– An anion is a negatively charged ion, a cation is a positively charged ion, and an ion is an electrically charged atom.

So what did I actually find out in these three catchments? Well I analysed the spatial and temporal variations of a variety of water parameters. The significance of focusing on both spatial and temporal variations within a catchment is it can easily identify areas of point source pollution at a small scale, something which isn’t done often enough.

For this post I’m focusing on dissolved oxygen and conductivity. The very important key species Freshwater Pearl Mussels require dissolved oxygen levels between 90 – 110% (Oliver, 2000). Other aquatic life like fish can survive on much lower saturations of dissolved oxygen, as low as <30%. The graph below shows how dissolved oxygen (a vital parameter for ascertaining the health of a river) changes through the year. Changes in water levels and plant growth can have serious effects on the amount of dissolved oxygen available for organic and aquatic life. During the summer months, plants will become abundant in a river, thus using up more oxygen and depleting the overall amount of dissolved oxygen available in a river. Once rainfall increases in the autumn dissolved oxygen levels should be replenished. As you can see September 2016 was a particularly poor month for dissolved oxygen, with average levels as low as 80%. Similarly, August on Toad Beck was low as well with an average of 75% saturation. But aside from in September for all three watercourses, and in August for Toad Beck, the dissolved oxygen levels remained within or above the proposed dissolved oxygen threshold.

2016 Dissolved Organic Carbon data graph - copyright Rosie Nelson

Next up – conductivity. Conductivity is a measure of a watercourse’s ability to conduct electrical flow and is therefore related to the concentration of ions in a river. Particular aquatic species need higher or lower conductivity – the Freshwater Pearl Mussel likes a lower conductivity. There are variations between suggested thresholds for conductivity: Moorkens (2000) suggests it should be 65µs/cm, whilst Bauer (1988) suggests <70µs/cm and Oliver (2000) suggests <100µs/cm. So I chose the only logical way forward and used all three thresholds. Focusing again on the month of September 2016, I produced the map below.

2016 Conductivity levels map - copyright Rosie Nelson

This is where analysing data spatially comes into its element. First up, the circles represent sampling locations (every now and again samples were missed out say if there were a herd of cows approaching as I climbed the style into their field, needless to say my flight or fight response would always be flight as advised in the National Park Authority’s Risk Assessments). Using a traffic light system, green circles represent good conductivity levels. As you can see, September was a poor month for both dissolved oxygen and conductivity. What I found particularly interesting was the variations that could occur in a small watercourse like Danby Beck, where as tributary field drains entered the beck conductivity levels could spike or decrease dramatically; how fantastic!

So to round off I thought I’d quickly summarise my thesis’ findings. Water quality is good in the three catchments, but it’s not good enough for Freshwater Pearl Mussels, and that’s the gist of it. The work of the River Esk catchment officers at the National Park to address the issues is great, the water bodies are reaching and maintaining ‘good’ ecological status, unfortunately the Freshwater Pearl Mussels require pristine water conditions and ‘high’ ecological status. However the future direction is positive for the health and conservation of Freshwater Pearl Mussels. And I too am looking forward to the future; I shall be taking a few weeks off from being chased by animals and I can’t wait.

 

 

 

 

A to Z: a number of Ns and Os

N and O

NATRIX NATRIX

There are three native UK snake species. Although Adders and Slow worms are common in the North York Moors, Grass snakes (Natrix natrix) aren’t. However they are found at at least one known site on the western edge of the National Park which makes them locally rare. They like rough grassland near to water and are known to swim (they’re also sometimes called Water snakes). Neither Grass snakes nor Slow worms are venomous, but Adders are.

Natrix natrix from www.herpetofauna.co.uk

All native snake species are protected. Please leave them alone and they should leave you alone.

NETWORKS

What is a network? In ecological terms it is basically the infrastructure through which species and habitats survive and flourish. In our 2012 Management Plan we identified the key ecological networks that we wanted to consolidate and enhance. Following the Lawton Principles (More, Bigger, Better and Joined) we’re working to ensure these networks and the associated habitats and species not only survive but become more resilient and sustainable into the future.

So what does a network actually look like? When we talk about networks and connectivity (which we do quite a lot on this Blog) we mean all sorts of things corridors, connections, linkages and stepping stones which whilst contributing to the same ecological goal, might look very different on the ground. For example, the Rivers Rye and Esk are important riparian linear networks, winding their way through other interconnected patchwork woodland and farmland networks. Some networks might be important for their great trophic diversity whilst others are essential for the survival of a particularly rare species. Promoting one particular network over another may impact on different species in different ways. For example, some farmland waders such as lapwing tend to nest in open fields with a low or short structure and areas of bare ground. One posited reason for preferring these open and large fields is that Lapwing want a clear line of site to any potential danger approaching their nests. So then planting hedgerows, usually a positive way to increase network connectivity, through good lapwing territory may negatively impact on this wader species. Similarly, native broadleaf woodland planting is usually something to be encouraged but not if it would break up a precious species-rich grassland network and adversely impact upon the important species that rely on it.

The North York Moors hosts a diversity of plants, animals and habitats. The challenge we’re grappling with is a putting together a jigsaw of different habitats and species; connecting up networks at varying spatial levels all within a framework of unpredictable future land use and climate change. It’s as difficult as it sounds.

And talking of different types of network, the National Park Authority is keen to foster a network of land managers in the North York Moors so we can share information and opportunities, and enable the North York Moors area to be a sounding board for new ideas in relation to land management and land use. If you are a local land manager and you’d be interesting in joining in – please contact us.

NEWTONDALE

Newtondale is a narrow valley cutting through the southern central moorland. It is the narrowness and steepness of Newtondale and its resulting inaccessibility which makes this dale unusual in the North York Moors which is renowned for its open landscapes. It contains important SSSI (Site of Special Scientific Interest) successional habitats including wet woodland, flush communities and species rich grassland.

Newtondale - copyright NYMNPA

Newtondale was formed in the last Ice Age at least partly as subaerial overflow from the glacial lake in Eskdale to the north of the higher ground drained south into the glacial lake in the Vale of Pickering. The two lakes formed from meltwaters dammed in the west by the ice sheet in the Vale of York and in the east by the massive North Sea ice sheet. Recently it has been suggested that Newtondale existed already at this time and the overflow scoured and deepened an already existing feature.

This naturally formed cutting was exploited by the always practical George Stephenson when he built the Pickering to Whitby railway (opened 1836). The railway connected up the northern and southern parts of the North York Moors divided by the large central area of high moorland. For centuries the only connections had being inhospitable and difficult trods and tracks. The railway line is still used – by the North Yorkshire Moors Railway, and Newtondale has its own request stop.

NICHOLAS POSTGATE

Nicholas Postgate was born in or near to Egton Bridge in Eskdale at the end of the 16th century. He was a Catholic. Although Anglican Protestantism was the official state religion by this time, there was much insecurity and uncertainty and an international element was attached to Roman Catholicism that meant not following the protestant religion as prescribed by the state implied potential treachery. In the first half of the 17th century refusing to attend Anglican Protestant services was illegal, this recusancy marked people out as non-compliant and dangerous .

Nicholas Postgate decided to be an active Catholic when passivity was definitely safer. He went to a seminary in France where he was ordained a priest and returned to England where after ministering to catholic gentry families he finally came back to Eskdale in the 1660s to practice his faith and serve persevering Catholics in the wider North York Moors travelling from house to house. The situation of the North York Moors, on the edge and out of the way, has allowed non conformist religions to survive and flourish over the centuries.

Father Postgate survived the Civil War and Commonwealth periods in England, but the Restoration re-ignited the fear of Catholicism which blew up into the Popish Plot in 1678. The plot didn’t need much substance, it suggested that internationalist Catholics were conspiring to murder the King and destroy the State just as many Protestants had long feared and gave credence to some not very latent animosity towards Catholicism and Catholics. There followed a short lived period of persecution and settling of scores.

Father Postgate was arrested in Littlebeck near Whitby, reportedly carrying out a christening. He was charged with being a Catholic priest in England and therefore causing Catholicism to spread ‘of purpose…not only to withdraw … subjects from their due obedience … also to stir up and move sedition, rebellion and open hostility … to the great endangering  … and to the utter ruin, desolation and overthrow of the whole realm’ (Act Against Jesuits and Seminarists, 1585). In line with the punishment for high treason as the highest crime imaginable, Father Postgate was hanged, drawn (disembowelled) and quartered at York on 7 August, 1679. He was 83.

Nicholas Postgate has been beautified by the Catholic Church as one of 85 English Martyrs. His beatification means he is known as the Blessed Nicholas Postgate, intercessional prayers can be addressed to him, and his image and relics are venerated. Reportedly a lock of his white hair is kept in a reliquary at Egton Bridge, a jawbone at English Martyrs Church in York, and a hand with a blood soaked cloth at Ampleforth Abbey.

There is an annual local rally in honour of the Blessed Nicholas Postgate, held alternatively in Egton Bridge (where he was born) and Ugthorpe (where he lived up to his death).

NORTH YORK MOORS

A lot of people get the name wrong. The North York Moors means the moors north of the city of York. There are other areas of North Yorkshire moors and moorland, but only one North (of) York Moors.

OPPOSITE-LEAVED GOLDEN SAXIFRAGE (Chrysosplenium oppositifolium)

Opposite-leaved golden saxifrage is a creeping perennial plant which can form extensive mats in damp, shady areas. So look out for it alongside becks, flushes and springs. It produces tiny golden flowers (3 to 5 mm) from February through to July. The plant has square-stems with directly opposite pairs of leaves.

Chrysosplenium oppositifolium from freenatureimages.eu

To make identification more complicated there is also an Alternate-leaved golden saxifrage (Chrysosplenium alternifolium) which shares the same genus. This species is very similar to the Opposite-leaved golden saxifrage except, as the name suggests, the leaves are alternate rather than opposite, and on triangular shaped stems. Its flowers can also be a bit bigger and brighter. The Alternate-leaved golden saxifrage is less common than its Opposite-leaved relative and it prefers a more limey habitat, but occasionally the different species can be found growing together.

Chrysosplenium alternifolium from freenatureimages.eu

ORCHARDS

In the North York Moors 19th and early 20th century farms and a lot of village houses had their own small orchards (still visible on Ordnance Survey historic mapping). Orchard fruit and other soft fruit provided part of a multi source income to people living hand to mouth and making the most of what they had. The fruit season ran from July through to winter – starting with gooseberries, then red and black currants and raspberries, then plums and finishing with apples and pears. The fruit wasn’t just sold at local markets, fruit could be sold on and because of the railways could end up in towns like Scarborough or end up in jam factories in Liverpool and Grimsby, or at the Rowntree’s factory in York to make jelly.

Apple and pear trees, as well as other tree species, are susceptible to canker (fungus). To counter this people used to whitewash orchard tree trunks with lime and spread lime on the orchard floor. Lime is still used as a fungicide.

Main local orchard species for the moors and dales are recorded as being:
Cooking Apples: Bramley’s Seedling, Lane’s Prince Albert, Old Cockpit
Eating Apples: Green Balsams, Winer Pippins
Pears: Hazels

Taken from Life and Tradition in the Moorlands of North-East Yorkshire by Marie Hartley and Joan Ingleby

The loss of orchards since WWII has been a major change in the landscape, biodiversity and culture of the North York Moors.

ORTHOSTATIC WALLING

An orthostat is a vertical ‘upright’ set stone. If its old enough i.e. prehistoric, it is likely to be called a standing stone. Less dramatic orthostats can also be found in drystone walls where farmers have made use of the stones to hand. Big stones have been reused over time and set vertically into the ground amongst the horizontally laid smaller stones more commonly found in drystone walls. Orthostats are also very useful within a wall as gate posts or as the edges of a sheep creep (to allow sheep but no other stock to rove) providing added strength and structure.

Orthostatic walling is rare enough here that where it does occur the walls are often recorded on the NYM Historic Environment Record.

Stone sheep creep built into wall in Raisdale - copyright Ami Walker, NYMNPA

Previously on the North York Moors A to Z … A, B, C, D, E, F, G, H, I, J, K, L, M

Turtle Doves: back with a purr

Richard Baines – Turtle Dove Project Officer

In my time as a birdwatcher I have learnt to identify any large pigeon-like bird crashing through the trees as a blundering Woodpigeon. These very successful birds are with us all year round fattening up on our winter bird tables.

Turtle Doves however are a very different story* – more remarkable and more refined, no clattering of wings, just a delicate flutter and an enticing soft purr. The Turtle name is presumed to come from the latinisation of their call: turr turr. The Turtle Dove is currently considered a high conservation priority in the UK because of severe population decline, and is classed as vulnerable on the IUCN’s red list of threatened species.

NYM Turtle Dove - coyright Steve Race

The Turtle Dove (Streptopelia turtur) is the smallest member of the European dove family but it flies the furthest during migration; a bird nicknamed Titan was radio tracked in 2014 and found to have flown 11,200 km from Mali back to its nesting site in Suffolk. He flew up to 700 km per night, at speeds up to 60 km per hour!

This year our North York Moors Turtle Doves have arrived back from Africa on time despite the cold north winds in early spring. Our first bird was seen on 16 April near Pickering. This was perfect timing for the start of my role as the HLF funded Turtle Dove Project Officer a few weeks later.

As the spring has developed our vital group of volunteer bird surveyors have been out and about recording Turtle Doves in known sites where they were present last year and in new sites offering similar habitats. Our project area survey is one of only two formal, locally based Turtle Dove surveys in the UK this year and the only one in the north of England. We’ll be looking to extend this surveying into the Howardian Hills Area of Outstanding Natural Beauty (AONB) in 2018.

One of the known sites for Turtle Doves is the National Park Centre at Sutton Bank. Up to three birds were recorded here in May visiting the bird feeding station, usually when there were fewer visitors around. Turtle Doves can be shy and wary. We are collecting lots of data on the birds at Sutton Bank and have a special Turtle Dove sightings book in which we want visitors to note their sightings – so if you are up at the Centre and you see the Turtle Doves, please add your report.

Using reported sightings we’ve identified the initial villages along the southern edge of the North York Moors which have small populations of the bird (< 6) and where we hope to start building community links and engagement.

During the next couple of months if you’re lucky enough to see or hear a Turtle Dove in or around the North York Moors, please let us know. The best time to hear them is either very early in the morning or late in the evening.

Example of Turtle Dove habitat - forest edge, Cropton Forest - copyright Richard Baines

*Footnote: The Turtle Dove has long been culturally associated with true love and devotion.

“..Oh yonder doth sit that little turtle dove
It doth sit on yonder high tree
A making a moan for the loss of his love
As I will do for thee, My dear
As I will do for thee”

Going with the flow

Anne-Louise Orange – Ryevitalise Programme Manager

Following the success in securing Heritage Lottery Fund money to support the development of our Ryevitalise programme, the team are now in place and working towards a Stage 2 application*.

The Heritage Lottery Fund’s Landscape Partnerships programme is for schemes led by a partnership of local, regional and national interests which aim to conserve specific areas of distinctive landscape character.

River Rye at Lower Locker, Snilesworth - copyright Liz Bassindale, HH AONB.

The Ryevitalise landscape incorporates the main upper Rye catchment, made up of the upper valleys of the Rye including the River Seph and the River Riccal. The Ryevitalise programme aims to protect and enhance the area’s natural and cultural heritage, resulting in a more natural, better functioning and better understood landscape.

River Rye in Duncombe Park - copyright NYMNPA.

We’ve got a remarkable abundance and variety of priority habitats and wildlife; a number of rare and priority species are strongly linked to the river valleys, including one of only three known UK populations of Alcathoe bat. The catchment is also a national hotspot for veteran trees – iconic and irreplaceable features of both our natural and cultural heritage.

River Rye - crow foot beds in the Vale of Pickering - copyright.

Ryevitalise projects will cover four themes:

  • River Riccal at sunset - copyright Rosy Eaton, Natural England.Water Environment, investigating aquatic habitats of the Rye and rare and threatened species;
  • Water Quality, working with land-owners and managers to reduce pollution;
  • Water Level Management, working alongside our delivery partners to harness natural processes to manage the sources and pathways of flood waters; and
  • Reconnecting People, improving the understanding of the river landscape by telling the story of its evolution and encouraging people to protect their heritage.

The new team – that’s me and Alex Cripps, Catchment Restoration Officer – are keen to hear from anyone with an interest in the Rye catchment. We will be consulting with partners, local landowners and wider communities over the coming months as we develop the projects we want to deliver, ensuring we incorporate peoples’ ideas and knowledge under the four themes. We look forward to meeting with/talking to as many people as we can as we develop our Stage 2 application.

Aerial view of River Rye and Nunnington Hall - taken by NEYEDC.

*The Stage 2 application will be submitted to Heritage Lottery Fund in the autumn of 2018.

Heritage Lottery Fund logo

Two Turtle Doves, one Turtle Dove, and then there were none

We’re beginning a new three-year project (Only Two Turtle Doves? An urgent quest to save our summer visitor) with funding from the Heritage Lottery Fund* through their ‘Our Heritage’ grant. We want to try and help our local population of Turtle Doves. The species is declining dramatically in the UK and is considered vulnerable to global extinction. The North York Moors still has a small population of the birds which currently breed here over the summer before migrating back to Africa.

Turtle Doves - copyright RSPB.

We know that Turtle Doves have been recorded mainly around the forests on the southern fringe of the North York Moors. Through our project we want to establish what it is that the Turtle Doves favour in terms of farmland/forest edge habitat here and then provide informed advice and carry out conservation work to secure and enhance these habitats to maintain our local population. We’re aiming to assist the birds by ensuring there are suitable plants for seed to eat throughout the summer, and also by providing clean supplementary seed in spring. The spring seed will help the birds reach breeding condition quickly once they arrive back following migration and this should hopefully improve breeding success.

We will be commissioning annual surveys and working with local volunteers on supplementary surveys, as well as asking the general public to submit sightings. The conclusions from the data collected will build up an understanding and help target and tailor advice to land managers whose land is, or could be, supporting the species though simple actions or help into an agri-environment scheme. The idea is that this will not only benefit Turtle Doves, but other declining farmland birds such as Skylark, Yellowhammer and Grey Partridge and wider biodiversity interests such as cornfield flowers, wildflower grasslands and pollinating insects.

We’re looking to build on synergies developed with the Cornfield Flowers Project, a long term arable flora conservation initiative and its existing network of conservation-minded farmers which provides a model for engagement and a source of farmer champions. We want to expand this engagement and use farm and woodland managers as advocates to share knowledge and best practice.

We’ll also be involving other parts of local communities as well as visitors – through interpretation, events and talks – sharing how to identify the Turtle Dove, where it goes on its perilous cross continent migration, why it needs assistance and what that entails. The more people appreciate the species as part of their natural heritage, the better placed the species will be to get the active help it needs to survive. We will be working with Parish Councils and Parochial Church Councils to manage public land for the benefit of the species e.g. roadside verges, village greens, churchyards, cemeteries; and we’ll be advising what people could do in their own gardens. Hopefully small actions will have beneficial consequences for the birds and for the people who then get to see and hear Turtle Doves in their own locality.

As well as the HLF and the National Park Authority, other project partners include the Forestry Commission, the RSPB, the North and East Yorkshire Ecological Data Centre, Scarborough Borough Council, and the Howardian Hills Area of Outstanding Natural Beauty; and crucially volunteers as well as the land managers and the local communities on the ground.

Turtle Dove - copyright THINKSTOCK.

We want to do what we can to prevent local extinction and to contribute as much as we can to the conservation of the species nationally so as many people as possible can get to hear the Turtle Dove’s evocative purring call first hand.

We’ll let you know what’s happening and how to get involved as the project develops.

* The project is part of the HLF’s campaign – Yorkshire’s Back Garden – to re-connect people to their natural heritage.

When is a woodland a wood?

Mark Antcliff – Woodland Officer

The National Park Authority has played a role in creating more than 600 hectares of new native woodland since the turn of the century, with something in excess of half a million trees established.

But when is a new woodland actually a wood and how do you measure the success of a habitat created?

In terms of tree growth the first milestone is when the young trees are fully established and have outgrown the competing vegetation and the attention of voles, rabbits, deer and livestock and their teeth. The second is when the branches of the new neighbouring trees meet – this is called “canopy closure” – from which point the ground flora will alter as shade tolerant and shade loving species will have better success, including our beloved bluebells. Perhaps a third is when the new trees reach a stage where they could be used to produce wood and timber through thinning or coppicing.

I was thoughtful of this question when revisiting a site that was planted about 16 years ago in Bilsdale. Here the area of an existing woodland had been extended by new planting, mainly young oak trees.Existing area of Ancient Woodland in Bilsdale. Copyright NYMNPA.

Contractors planting new woodland alongside the existing Ancient Woodland, back in 2001. Copyright NYMNPA.

There were some initial challenges caused by a faulty batch of plastic tree shelters that degraded faster than they should have leaving the new trees vulnerable. However the trees are now fully self-supporting and I can walk under them, which for me personally is a good moment as I can then consider myself in a wood rather than looking at it. The icing on the cake however is that some of the trees planted 16 years ago are now producing acorns, a sign that a true self-regenerating woodland has been created.

Part of the woodland planted approx. 16 years ago showing this year’s additional planting in the distance. Copyright NYMNPA.

Buoyed by such success we have, with the cooperation of the land owner and his agent, planted an additional area of 3 hectares this winter. I can’t wait to see how this new woodland extension looks in another 16 years’ time, alongside the ancient and post-millennial woods already in place.

As a Woodland Officer, I do tend to think in the long term.

Loving Levisham Estate: a personal view point

Rachel Pickering – Natural Environment Team Leader

Every day (when I am not at my desk) I take the dog for a walk past ‘the view point’ and every day I love it!  How could you not?

‘The view point’: view from Newton on Rawcliffe looking north east over Levisham Moor. Copyright Rachel Pickering, NYMNPA.

‘The view point’: view from Newton on Rawcliffe looking north east over Levisham Moor

My favourite version of the view is when the wisps of mist are still stuck to the trees in the valley even when the rest of the morning mist has long since left. I get to admire the landforms – Newtondale, the finest example of a glacial-lake overflow channel in England, carving through the striking two tiered moorland plateau. If I time it right I can hear and sometimes see a steam train chugging and tooting its way into Levisham Station down in the valley.

What makes this view extra special for me in particular is that it comprises part of Levisham Estate which I manage, alongside our Senior Ranger David Smith, for the National Park Authority. Between us we ensure that the Estate, which has been owned by the Authority since the 1970s, is managed for National Park purposes. As well as the stunning landscapes it boasts some outstanding wildlife habitats and a full range of archaeological curiousities including scheduled monuments.

It’s not just me that thinks its special. The majority of the Estate is designated as a Site of Special Scientific Interest (because of succession habitats, botany and geology), with the moorland also being designated as a Special Protection Area (because of merlin and golden plover populations) and a Special Area for Conservation (because of heathland habitats).

The majority of the Estate’s 3,358 acres are heather moorland but it actually includes a bit of everything. Here are a few of its gems:

Over the years we’ve been carrying out projects to conserve and improve the Estate. Here are a few examples of these:

Levisham Moor with heather in bloom. Copyright NYMNPA.

Improvements to the moorland grazing regime via a traditional Countryside Stewardship Scheme (2003-2013) and continued through the current Higher Level Stewardship agreement with the Commoners (Levisham Moor is Common Land).

Hole of Horcum following bracken control in 2015. Copyright/photo credit rjbphotographic.co.uk

Hole of Horcum area in 2015 showing positive results of bracken control . Bracken has also been specifically controlled on areas of high archaeological value at Rhumbard Snout and Dundale.

Carrying out scrub control at Station Field. Copyright NYMNPA.

Scrub control on wet grassland habitat at Station Field 2008.

Tree Planting, Hole of Hocum in 2011. Copyright NYMNPA.

Tree planting in the Hole of Horcum 2011 as part of the Slowing the Flow at Pickering partnership project.

Access improvements, Hole of Horcum in 2013. Copyright NYMNPA.

Access improvements being shown to National Park Authority Members – pitched path in the Hole of Horcum 2013.
Levisham Moor and the Hole of Horcum Walk

The Estate is a great place for volunteers to get involved. Over the last few years 4,000 of the trees planted are thanks to our committed volunteers. It has also proved to be a useful place for our Apprentice teams to practice their newly learnt skills including heather burning, bracken and scrub control, and fencing.

The Levisham Estate is a big commitment and a rewarding place for many people, not just me.

Footnote
I confess that I am feeling rather reflective at the moment as a couple of colleagues who have been working at the Park for even longer than me (over 18 years) are about to leave. I grew up near to Levisham Estate and have seen the changes close up, over time. A few years ago the following photos of ‘the view point’ were included in the ‘Now and Then’ photographic exhibition at The Moors National Park Centre, Danby. It was rather strange, but striking, that on the day I went to take the ‘now’ photograph there just happened to be four walkers sat on the bench. They were fascinated to see the level of change to the landscape and fortunately were very happy to be slightly rearranged to replicate the ‘then’ photograph.

The 'then' photo - looking down Newtondale, 1960s.

The 'now' photo - looking down Newtondale, 2012. Copyright NYMNPA.

A to Z: a multiplicity of Ms

M

MAGNETITE

As mentioned previously, in the 1850s a seam of iron rich ironstone was discovered in Rosedale. Also known as lodestone, magnetite had long been a valued mineral because of the amount of iron ore it contains, so much so that it is often magnetic.

Rosedale - copyright Colin Dilcock, NYMNPA

The discovery in Rosedale led to the rapid development and expansion of the mining and calcining industry there and in the wider area. There were great expectations …

“Professor Phillips delighted and informed the company by his description of the ‘Ironstones of Cleveland’ … The Rosedale band at its richest points, yielded 50 per cent [ore] and in many places 42 per cent. The Rosedale stone was magnetic and contained phosphorous, it was not merely magnetic, but it had an inherent magnetic polarity … There must spring up over the Cleveland district, through the working of the iron ore, great towns, with a numerous and active population; and, as a result, the moorland would be brought under cultivation and this once dismal tract of 20 square miles would rejoice in all the material means that could promote human happiness and prosperity…”

From a meeting of the British Association for the Advancement of Science at Leeds, as reported in the Manchester Courier and Lancashire General Advertiser, 2 October 1858.

However the actual magnetite seam was soon exhausted leaving the industry exploiting poorer ironstone and slowly declining into the 20th century. The magnetite proved to be rather a flash in the pan.

This Exploited Land of Iron logos

MESOTROPHIC LAKES

There are very few natural lakes in the North York Moors due to geology and climate, which makes Lake Gormire on the south western edge of the National Park even more remarkable. In the last Ice Age a hollow was formed by a meltwater channel between the edge of the moving Vale of York ice sheet and the edge of the North York Moors gritstone escarpment. The channel damned up and the lake left behind divided into two bodies of water – Gormire and the much smaller, Buttermere.

These are mesotrophic lakes – containing a narrow range of nutrients in medium concentrations. This type of lake chemistry is rare and becoming rarer as lakes are effected by artificially increased levels of nitrogen and phosphorus and so become eutrophic. Lake Gormire is surrounded mainly by semi natural woodland and fed by springs and so largely circumvents the risks of artificial diffuse pollution and nutrient enrichment.

Because of their chemistry Mesotrophic lakes can support higher levels of diversity of macrophytes (algae), aquatic plants, invertebrates and fish. The fen (‘mire’, ‘mere’) plants around Gormire/Buttermere reflect the acid soil, so there is Marsh cinquefoil Potentilla palustris, Common skullcap Scutellaria galericulata and Tufted loosestrife Lysimachia thyrsiflora, as well as Bog bean Menyanthes trifoliata and Water horsetail Equisetum fluviatile. Gormire is particularly popular with noisy water birds, mating toads and freshwater leeches, all exaggerating the primeval sense inside this Ice Age hollow.

Lake Gormire from Cleveland Way, north of Sutton Bank - copyright Mike Kipling, NYMNPA

Lake Gormire and the area around it is a designated Site of Special Scientific Interest. The cliff slope woodland above Lake Gormire is the Garbutt Wood Nature Reserve managed by the Yorkshire Wildlife Trust.

MILKY WAY

The Milky Way is a galaxy of billions of stars and planets sometimes partly visible to the naked eye as a milky looking band of light in the night sky.

Milky Way and Perseid Meteor Shower Sutton Bank - copyright Russ Norman Photography.

We’re in the middle of the Dark Skies Festival 2017 here in the North York Moors National Park. The dark skies over National Parks make it easier to see the lights of the galaxies around us. This February is particularly good for viewing Orion and also a very bright Venus.

February 27 1920   The mysterious stars

…Later in the evening a half-moon shone in a filmy sky across which, from S.E. to N.W., ran a Noë-ship of thin white clouds. A soft mist hung in the far valleys, but the nearer moory slopes loomed clearer. In the pastures the furze bushes were startlingly like huge black beasts grazing on the rimmed herbage. No sounds broke the utter silence of the moonlit hills; the wind had almost died away, but as I stepped over the little rill from Thunderbush Farm [Commondale], I heard its faint, musical ripple.

The ever-mysterious stars flashed through the interspaces of the filmy clouds and circled silently above the dim earth. Sirius flashed due south whilst mighty Orion hung high above the moor edge, his glory somewhat dimmed by the moon. What would life have been without the stars?”

A Man of the Moors: Extracts of the Diaries and Letter of Frank Elgee.

MINI-BEASTS

We use the term mini-beasts for the tiny invertebrates that go without notice until they’re looked at under the microscope and a menagerie of marvel and dread is revealed.

Identifying and counting river invertebrates is a very useful way of assessing the health of a river at a particular spot. Certain species indicate good water quality and others, poor water quality; a change in species/numbers indicate a change in water quality e.g. a pollution incident. There is a national programme of riverfly monitoring led by the Riverfly Partnership. Results are recorded centrally and indications of a potential incidents are reported to the Environment Agency. The National Park run a number of local Riverfly Monitoring Workshops for volunteers – the next one is 1 March.

MOSCHATEL Adoxa Moschatellina

Moschatel is a perennial unobtrusive plant which likes the damp, shady conditions found along woodland edges and on shaded hedge banks. It flowers between March and May, producing five lime green flowers on top of a leafless stalk, four flowers face outwards and one flower faces upwards, forming a cubic which has led to the plant’s other common name – Townhall Clock. The plant grows along the ground through rhizomes with the flower stalks growing up through its leaves to only c. 15cm tall. It is a common plant but easy to miss – look out for it in early spring before it gets hidden by taller plants.

Moschatel at Sieve Dale. Copyright Ami Walker, NYMNPA.

MOTTE AND BAILEY

Historic England suggest there are over 600 motte castles or motte-and-bailey castles in England. These were early medieval fortifications built by the Normans and made up of a large mound of earth/rubble (the ‘motte’) with a defensive palisade and tower on top, and an embanked enclosure with other buildings (the ‘bailey’) adjoining.

A motte and bailey castle could act as a fort when required as well as providing the residence for the local landowner/representative of the King and a centre for feudal power. They were often built on high ground to take advantage of the extra height to dominate the landscape and overlook access routes.

Soon after the beginning of Norman rule in England came the ‘harrying of the north’ – a military campaign to overcome and overwhelm the population in the north of the country and hammer home the idea that the Normans were here to stay. The new motte and bailey castles were a highly visible tool for holding that ground and reinforcing that message.

By the 13th century castle design had moved beyond the basic motte and bailey. Although the timber structures have largely gone, the earthworks are often still traceable in the landscape, and rubble mottes and the remnants of stone towers remain. Many are scheduled. Examples in the North York Moors include Hood Hill, Easby motte, and Foss Castle.

MOTHS

Moths are often considered the poor cousins of butterflies in the Lepidoptera family. The most obvious difference between butterflies and moths are that the former are active during the day whereas moths are mostly (but not all) nocturnal, feeding on the nectar of night blooming/night scented plants. Another difference is that when resting, butterflies usually close their wings whereas moths leave theirs open and this makes it easier to examine their intricate patterning and refined colouring. But as with most ecological questions – what is the difference between butterflies and moths? – there is no obvious answer and always an exception. Moths can be just as colourful, just as beguiling and just as in peril, as butterflies. For more on moth conservation see here.

Shandy Hall, Coxwold has become a location for moth study and reporting over the last few years. The gardens there provide a semi-natural/cultivated habitat for many species – over 400 different species have been recorded in the gardens to date.

Previously on the North York Moors A to Z … A, B, C, D, E, F, G, H, I, J, K, L

Ageing Mussels

Simon Hirst – River Esk Project Officer

As mentioned previously, the River Esk in the North York Moors is the only river in Yorkshire with a Freshwater pearl mussel population Margaritifera margaritifera. The population is estimated to be comprised of approximately 1,000 individuals and is in drastic decline, so much so that it is on the verge of extinction. The decline is due to a number of linked causes such as water pollution, choking of the river bed by sediment build-up, deterioration in fish numbers and habitat degradation.

A dense bed of healthy adult mussels in Scotland. Copyright Sue Scott - SNH,

We’re working to improve the riparian habitat and so help secure the local population of Freshwater pearl mussel in the River Esk. We recently sent a sample of mussel shells from the Esk* over to the Swedish Natural History Museum in Stockholm, in order to determine the age of the mussels in the River Esk. The maximum age of Freshwater pearl mussels in the wild has been shown to vary considerably, from a low of 35 years in Spain (warmer, lower latitude rivers) to over 200 years in arctic areas (colder and high latitude rivers). Information from the ageing study would tell us how long we have left to save the Esk population from extinction and help identify the approximate time when the River Esk mussel population went into decline.

Dr Elena Dunca from the Swedish Natural History Museum sectioned (cut though) the shells supplied and then counted the growth lines on the mussel shell using a high powered microscope.

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Growth lines visible on the freshwater pearl mussel shell.

Esk FWPM - Age and length graph - Swedish Natural History Museum

This age/length graph will allow us to age fairly accurately any mussels we find in the wild in the future just by measuring them.

A total of 10 shells were aged by Dr Dunca, and the graph below shows that the mussels sent to Sweden ranged in age from 45 to 88 years of age.  The mussels in the River Esk also showed normal growth rates.

Esk FWPM - Length frequency graph - Swedish Natural History Museum

Length frequency graph of mussels in the River Esk

The smallest live mussel we have found in the Esk up to now was 75mm (approximately 28 years of age). This means the last time the Esk mussels reproduced successfully in the wild was in the late 1980s. The largest mussel we have found in the Esk was 156mm (approximately 100 years of age), which means it was born around the time of the First World War. The vast majority of the mussels are around the 130mm-140mm size range (approximately 80 years of age). We now know for scientific certainty that the Esk has an ageing population in need of help!

The best hope for our mussels is for them to start to successfully reproduce again. We’re working with the Freshwater Biological Association (FBA) who are carrying out captive breeding work in the Lake District. We hope to re-introduce the captive bred young Esk mussels from the FBA Facility back into the Esk once the riparian habitat is restored enough to sustain them, and so ultimately stop this species from becoming extinct in the wild (of Yorkshire).

* Please note – No mussels were harmed in the making of this study! We used empty shells that were found on the banks of the Esk.

Thanks to our funders at Biffa Award, for their support to carry out this vital research work.

Biffa

Biffa Award is a multi-million pound fund that helps to build communities and transform lives through awarding grants to community and environmental projects across the UK, as part of the Landfill Communities Fund.

Revitalising the Rye

Tom Stephenson, External Funding Officer

There must be something in the water in the North York Moors, having just started delivering the This Exploited Land of Iron Landscape Partnership Scheme, the National Park Authority and its partners* have also been successful at the first stage of securing a further £2 million of Heritage Lottery Fund money to develop our next Landscape Partnership SchemeRyevitalise.

The River Rye and its tributaries rise on the moorland of the North York Moors, flowing through fast and clear upland becks that carve out steep sided dales until the land flattens and the river slows and broadens taking on the character of the undulating Howardian Hills and the flat lowlands of the Vale of Pickering. The Ryevitalise Landscape Partnership Scheme under development will help appreciate and enhance the Rye’s verdant landscape and clear waters which have been prized for millennia for their beauty and tranquillity resulting in a more natural, better functioning and better understood landscape.

Planned projects will cover four themes:

  • Water Environment, looking at aquatic habitats of the Rye and rare and threatened species;
  • Water Quality, working with land-owners and managers to reduce pollution;
  • Water Level Management, working alongside our delivery partners to harness natural processes to manage the sources and pathways of flood waters; and
  • Reconnecting People, improving the understanding of the river landscape by telling the story of its evolution and helping people to protect their heritage.

Without wanting to spoil the surprise of future blog posts, below are just some of the particular issues we are aiming to address through Ryevitalise scheme projects if we’re lucky enough to be successful in our Stage 2 application due in October 2018.

The wet…

Water is the major theme of Ryevitalise. Through the Ryevitalise scheme, from the high moorlands to the lowland wetlands, we will identify priority areas of riparian habitat for restoration to ensure existing high-value habitats (and their species) are in positive management and can act as nodes from which to extend outwards by creating ‘stepping stones’ and connections between these habitat sites.

Wetter still, we will assess the geomorphology and key features of the aquatic environment and target areas where aquatic habitats could be improved by creating changes to the channel through creating gravel bars, by placing debris to create slacks or by making changes to river bank profile. This work will include a survey of the habitats and species of the oxbow lakes in the lower Rye, and also the collecting and analysis of sediment cores to look for valuable paleoecological data which might shed light on how the local landscape formed.

The dry…

We have previously reported on the problems that fluctuating water levels in the River Rye
in Duncombe Park has on the White-clawed crayfish, the only native crayfish in the UK, White-clawed crayfish - during 2016 rescue in Duncombe Park. Copyright NYMNPA.which is suffering from a “perfect storm” of threats. Ryevitalise will prioritise protective measures for the existing population and carry out a feasibility study to identify where potential local ark sites might be located. Ark sites for White-clawed crayfish would allow populations to become established in isolation, separated from the threat of non-native crayfish and the crayfish plague they can carry.

The small…

Alcathoe bat. Copyright Cyril Schonbachler.One of the Rye catchment’s smallest inhabitants is the Alcathoe bat. Relatively new to science, having been first identified in 2001 and only recently becoming the latest addition to the UK bat family, this little creature has only been found at two other sites in the UK so far. Ryevitalise will seek to establish a deeper knowledge of where colonies of the Alcathoe bat and other key bat populations are, along with the requirements to support their survival.

The tall…

At the other end of the size spectrum and intrinsically linked to bats are some of the Rye catchment’s largest residents – its ancient and veteran trees. The area is a national hotspot for these giants that not only give an air of majesty to the landscape as living witnesses to history but also provide important habitat for many invertebrate species as well as providing important roosting sites for Rye bat populations.

The old…

Not only is the Rye catchment home to iconic built heritage like Rievaulx Abbey, Rievaulx Terrace, Duncombe Park and Nunnington Hall but it also contains a wealth of less obvious heritage that traces vernacular land use and tells the story of the working River Rye. Working with local history groups, Ryevitalise will record the remaining evidence of man’s relationship with the river over the centuries, surveying and recording the traces of the former agricultural and industrial settlements along the river banks. Accurate 3D models will be produced of the principal remaining watermills, iron working sites, water races and leats. Essential conservation and consolidation work will be identified from the surveys carried out.

The new…

Meanders in Rye near Sproxton - can see the water crowfoot beds within the river, September 2016. Copyright North East Yorkshire Ecological Data Centre.Like a lot of watercourses, it is not practical to access the river in its entirety at ground level. So as part of the Ryevitalise scheme an Unmanned Aerial Vehicle flight will record the entire 50km main river from its moorland origins all the way downstream to where it
meets the River Derwent. This will produce an invaluable record and will provide an insightful journey along the river for local communities, highlighting how this vital artery connects them all. Tailored sections of flight data will be made freely available to local schools, businesses, and community groups as a community resource; it will also form part of the scheme’s wider education programme.

We are all really excited about the next steps in developing the Ryevitalise scheme; the opportunity to make the most of the wealth of habitats, species and history surrounding the river; the potential to make a lasting difference to this wonderful landscape, and the chance to create a real splash.

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* Partners currently include East Yorkshire Rivers Trust, English Heritage, Environment Agency, Forestry Commission, Howardian Hills AONB, National Trust, Natural England, North Yorkshire County Council, Ryedale District Council, Woodland Trust, Yorkshire Wildlife Trust, as well as local communities.