Electric expeditions

Kate Bailey – Catchment Partnership Officer

Electric fishing is a method used to determine fish populations in watercourses, commonly carried out by organisations such as the Environment Agency and the various River Trusts. Sites across the River Esk catchment up in the north of the North York Moors have been monitored using this technique over the past 20+ years as a way of estimating juvenile fish populations. In the last five years an increased number of sites have been surveyed along the Esk and we’ve managed to gain a better understanding of fish population changes.

This summer we took the chance to learn the technique ourselves. Simon Hirst our River Esk Project Officer, six keen volunteers and I went on a fully certified electric fishing course. Our new specialist team is made up of local anglers and existing River Esk Volunteers, all of whom care about the river and want to safeguard the species that live in it.

The two day course was essential to ensure our ‘in house’ monitoring can be carried out safely and to make sure the information we collect is scientifically robust so we can draw conclusions from it.

Methodology

During an electric fishing survey an electrical current is sent through the water which temporarily stuns the fish enabling them to be easily caught in nets. To produce an electrical current one team member wears the backpack which holds a battery and control box. A cathode trails behind the backpack resting in the water and the operator holds a pole with a metal ring on the end (anode). Once the operator places the anode in the water and turns the system on, the electrical circuit is complete and a small current passes through the water. The equipment has multiple safety features to ensure surveys can be carried out safely for all involved – that’s the fish, the operator and all the other team members in the water and on the bankside.

Two or three team members follow behind the operator with the nets and buckets ready to quickly remove the stunned fish from the river.

September 2017 - Electric Fishing in Esk. Copyright NYMNPA.

Once caught, the stunned fish are transferred into a large holding tank on the bankside. Each fish is measured using a special measuring board – this helps us estimate the relative age of the fish. The size and species is noted down and the fish is then released back into the river as quickly as possible.

September 2017 - Electric Fishing in Esk. Copyright NYMNPA.

Sites are identified – usually an approximately 50 metre stretch of river – and the team enters the water at the downstream end and walks upstream fishing as they go until they reach the top of the site. It is useful to fish up to a feature in the river, for example a natural barrier like a riffle, to ensure the greatest percentage of fish can be caught. If the end of the site was situated in the middle of a pool, for example, the fish would be driven beyond the far end and hence not be recorded.

Once the site has been fished, it also needs to be measured – this allows us to work out species density (i.e. the number of fish per unit area). We measure the channel width at 10 metre intervals and calculate an average width. This average width is multiplied by the length of river surveyed to give us a total area of river fished! Fish densities are usually recorded as the number of fish per 100 metres2

September 2017 - Electric Fishing in Esk. Copyright NYMNPA.

Health & Safety

Fish welfare (and the welfare of our volunteers and us) is extremely important, there is little point in measuring fish populations to help sustain numbers if we end up with dead fish. When electric fishing is carried out correctly this methodology does not harm the fish. As part of the training we learnt how to set the control box to the correct settings to ensure the electrical current will temporarily stun the fish but will not cause any damage. This is determined by the electrical conductivity of the water – a reading is taken before carrying out the surveys.  It is important to temporarily keep the fish in a large holding tank in the shade to ensure there is sufficient oxygen for them and that the water temperature does not increase too much, and we release the fish back to the river as soon as possible.

Fish aside, all team members who are in the river must ensure they are fully insulated (e.g. rubber chest waders) and must not put their hands into the water when the backpack is switched on. Prior to undertaking a survey each stretch of watercourse is checked for hazards and a site risk assessment produced. This is to make sure there are no ‘nasty’ surprises (such as deep holes!) when the team enter the water.

Why

Electric fishing is a really good way of estimating fish populations and this is extremely important on the River Esk. Atlantic salmon is a species that is struggling due to a wide variety of issues including water quality and habitat issues, barriers to fish migration and poor survival rates at sea. Monitoring juvenile numbers across the Esk every year will help to highlight areas where these issues are magnified and can therefore help target the conservation work we’re undertaking in the catchment to improve water quality and riparian habitats.

Our electric fishing team were out and about in the catchment in the autumn surveying six specific sites. It proved a success – the surveyed fish were released back and all the volunteers survived. Species recorded included Brown trout (Salmo trutta), Atlantic salmon (Salmo salar), Stone loach (Barbatula barbatula), European eel (Anguilla Anguilla), Bullhead (Cottus gobio) and Brook lamprey (Lampetra planeri). Overall our results showed healthy fish populations at each site, although as expected relatively low numbers of Atlantic salmon were found.

We plan to monitor juvenile fish populations annually in September, to build up our understanding of the local status of the Atlantic salmon and the other species found in the Esk.

Talking about Turtle Doves

Richard Baines – Turtle Dove Project Officer

Our Turtle Doves are now in Africa, but that doesn’t mean our work stops.

Turtle dove courtship at Sutton Bank NYMNP Visitor Centre May 2015 by Richard Bennet, North Yorkshire Turtle Dove Project

With the majority of results now in for our two formal survey areas (Cropton and Dalby Forests), along with many additional sightings logged this year, we can now announce our results. In 2017 a total of 244 birds were logged over 78 dates between the first seen on 17 April and the last record of one on 25 September near Pickering. Over both the 2016 and 2017 survey seasons we recorded 24 singing males in Cropton Forest. During our 2017 surveys in Dalby Forest we found 12 singing males. Our largest flock was 13 birds including juveniles recorded on 25 July 2017.

These results illustrate how important our area is for these endangered birds. In comparison there were very few sightings in the rest of Yorkshire this year and even fewer to the north of us. We have known for some time our area has been a stronghold for this species due to the committed work of many individual birdwatchers and the local Forest Bird Study Group. However this is the first time Turtle Doves have been surveyed as a single species in the north of England. We would not have been able to achieve these detailed results without the hard work of our volunteer surveyors. I started this project as a volunteer myself, keen to help these beautiful birds and I hoped other people would feel the same. Thankfully a small army have now joined the Turtle Dove brigade! Here’s a quote from George Day, one of our volunteer surveyors this year; “Being part of such an exciting project has been fantastic. It’s been a real treat to spend dawn in the forest with purring Turtle Doves”.

Carrying out these surveys can be fun in themselves, but we are often asked what happens to the data collected and is there a direct benefit to Turtle Doves? Within the first six months of this project the data collected by volunteers so far has been used to identify and target the best areas to set up new feeding sites and attempt to improve nesting habitat. I can now visit a farm, explain to the land manager how important their land is for Turtle Doves based on how many birds are nearby. This makes a huge difference to the delivery of the project.

Richard presenting to an end of term meeting of Turtle Dove volunteers, Dalby Visitor Centre 2017. Copyright NYMNPA.

We’re working hard to spread the word and plan sites for new and improved habitat to create in 2018. I have a Heritage Lottery Fund target to deliver 40 talks to groups in the three years of the project and I’m pleased to be on course to complete 20 by the end of the first year! It seems a lot of people want to learn about and help these iconic birds. From a small village community in Sawdon to a national Forestry Commission conference the North Yorkshire Turtle Dove roadshow is purring its way around our beautiful county and beyond….

North Yorkshire Turtle Dove Project logo

North Yorkshire Turtle Dove Project partner logos

Conservation recruits

Abi Duffy – Conservation Trainee and Sam Newton – Natural Heritage Trainee

Abi Duffy, Conservation Trainee. Copyright NYMNPA.I’m Abi Duffy, and I have recently started as a Conservation Trainee. I graduated from the University of Liverpool with a degree in Geography in July 2016 and since then I have been working towards gaining employment within the conservation sector. I am really interested in developing my knowledge and experience in this two year position with the National Park.

Sam Newton, Natural Heritage Trainee. Copyright NYMNPA.My name is Samuel Newton and I have started in the position of Natural Heritage Trainee with the National Lottery funded This Exploited Land of Iron Landscape Partnership Scheme. I have always been interested in the environment, leading to my graduation from Newcastle University with a degree in Ecology earlier this year. I am keen to use this opportunity to gain as much experience as possible of working in conservation.

Our first two months have been both varied and interesting as we’ve been contributing to a wide range of projects. We’ve taken advantage of the end of summer to be out in the field most days surveying.

Water vole surveying

One particularly memorable day was water vole survey training, for which we headed up to Fylingdales. This surveying entails walking a stretch of stream looking for signs of Water vole (Arvicola amphibious). The most obvious signs are droppings, which are ‘tic tac’ shaped and tend to be green, and are used for territory marking. Where droppings are flattened and more have been deposited on top this creates a ‘latrine’. We also looked for piles of nibbled grass, with a 45° cut angle at the end – characteristic of voles, as well as for burrows and footprints.

The training links in with our Water vole project which is aiming to secure the few remaining populations of Water vole within the North York Moors. The animals have North York Moors Water Vole. Copyright Elspeth Ingleby, NYMNPA.suffered from habitat loss and also the spread of invasive American mink. I (Sam) have been mapping water vole and mink survey results, mostly collected by our dedicated group of Water vole survey volunteers. These records create a base from which management of habitats and also mink can be carried out.

Botanical Surveying

We have been visiting species rich grasslands across the North York Moors, with a range of different underlying ecological conditions. By surveying the plant species and their abundance on these sites we can try and ensure management fits the individuality of each one, and that certain species are not being lost or becoming dominant to the detriment of others. Our Linking Landscapes volunteers also survey grassland within the National Park each summer; many volunteers survey the same site each year which helps identify changes. The volunteers send in their results to us for analysis.

Some of the interesting and beautiful flowers we have seen so far include Eyebright (Euphrasia officinalis), Common Spotted Orchid (Dactylorhiza fuchsia), Harebell (Campanula rotundifolia) and Fairy Flax (Linum catharticum). We also joined in with the Conservation Volunteers cutting some of these grassland sites where they’re not grazed and importantly raking off the cuttings to stop the grasslands becoming too nutrient rich. Nan Sykes’ book ‘Wild Flowers of North East Yorkshire’ has proved invaluable in helping improve our botanical ID skills.

Harebell. Copyright Sam Newton, NYMNPA.

MoorFest

As part of National Parks Week back in August, I (Abi) got involved with a MoorFest event at our Sutton Bank National Park Centre letting people know about the species rich grassland resource within the North York Moors. We had many families chatting to us about wildflowers and asking us questions about the grassland. This was a good way to help communicate to the wider public the work that farmers and the National Park do together to conserve and enhance grassland sites.

Moonwort at Sutton Bank. Copyright Ami Walker, NYMNPA.The triangular meadow out of the front of the Sutton Bank National Park Centre is a great example of such grassland. Back in June, before beginning in our roles, we both took part in a Volunteer training day there; we found the rare fern Moonwort and several Common Spotted Orchids among a vast array of species. This site is a good quality species rich grassland in top condition, and with continuing management we hope to keep it that way.

Triangle Meadow, Sutton Bank - Common spotted orchid at the forefront. Copyright Ami Walker, NYMNPA.

West Arnecliff Woodland Survey

In early August we were given the opportunity to follow up on research work done by the previous Research Student at the National Park, Sam Witham. Sam had been investigating the impact of deer browsing in woodland by constructing small exclusion enclosures, in order to establish whether these allowed greater natural regeneration. This is part of the National Park’s long term PAWS restoration project. Non-native conifers had already been removed from this site at West Arnecliff and the continuing research is to help understand how best to assist the regeneration of the Ancient Woodland features and habitat.

Japanese knotweed surveying

Something else we have been involved with is the River Esk project – in particular surveying stretches of the river for Japanese knotweed (Fallopia japonica). This destructive invasive has the potential to spread rapidly along the river banks generating sedimentation and damaging the river environment. There has been control work over the last decade but it’s important to keep on top of the plant and where it is coming back it needs to be treated as soon as possible to prevent a new outbreak. So the surveying is important and has become a bit of a right of passage for new members of the Conservation Department.

Conclusion

So far we have really enjoyed the first two months in our new roles We are looking forward to going out into the field even more and meeting and working with the land owners and land managers who shape the landscape of the North York Moors.

It is great to have the opportunity to understand and contribute to the work the National Park is doing, while learning about working in conservation at the same time.

Abi, Sam and Bernadline surveying in Rosedale. Copyright Elspeth Ingleby, NYMNPA.

Quest for knowledge

Graham Lee – Archaeological Officer

We recently commissioned additional high resolution LiDAR data (Light Detection and Ranging) for several areas of the North York Moors in partnership with Durham University who are currently involved in a long term research project on the coast. The data is collected by scanning the ground with beams of laser light. LiDAR data sees through vegetation and tree canopies which otherwise can obscure the view of the ground level to conventional air photography. For this commission we were particularly interested in areas of heather moorland.

Most publically available georeferenced LiDAR data in England comes from the Environment Agency. It is relatively low resolution, with data points collected at 1 metre or 50 centimetre intervals. The collected points enable the ground surface to be accurately mapped – the more points that are collected, the greater amount of detail that is recorded and revealed through 3-D representation. The newly collected data we now have is at 10 centimetre resolution which equates to about 90 data points per square metre. The amount of data means the ground topography can be perceived through relatively dense stands of vegetation, such as gorse.  For large expanses of the North York Moors which are covered in thick protective heather the idea is that this new data will help us to artificially see the archaeological earthworks beneath. It was this upland moorland plateau where prehistoric people lived and farmed and buried their dead.

As an archaeologist I am looking for human-made patterns in the landscape which represent different forms of earthworks created by human activity – either upstanding banks or ditches/hollows –which are visible in the data. Once noted, experience with data collected from aerial photographic survey allows these features to be interpreted. The interpretation is not necessarily conclusive – some more complex features will require a ground visit to collect further information before an interpretation can be firmed up. The features identified can then be incorporated within the National Park Authority’s Historic Environment Record (HER) which is the catalogue of our current archaeological knowledge. New and enhanced information which increases our understanding of archaeological landscapes is also very important for the protection and future management of archaeological sites.

Gallows Dyke, Levisham Moor. Copyright NYMNPA.

Initial examination of the LiDAR data for Levisham Moor has greatly increased our knowledge of the complexity and extent of the prehistoric and medieval field systems as well as other sites that survive here. This means that individual sites – such as possible prehistoric hut circles, as well as the extent of field system remains – can be precisely located and mapped rather than just using a general area. This is a considerable advance in our knowledge which greatly simplifies the locating of sites on the ground within extensive areas of what can seem like featureless heather moorland.

Fig 1: Dundale Rigg, Levisham Moor – The LiDAR imagery shows up the subtle remains of earthwork banks of an earlier (?Prehistoric or ?Medieval) field system overlain by later ridge and furrow cultivation. Also visible is a Bronze Age round barrow (mapped as a tumulus) with a central disturbance from the 1930s and a trial excavation from 1962, and the faint curvilinear traces of what is thought to be a prehistoric hut circle towards the top left of the photo.

Fig 2: Horness Rigg, Levisham Moor – Remains of a probable Prehistoric field system. The enclosed platform at the southern end, which sits within rather than being overlain by the fields, has been dated by excavation to the Late Iron Age or Roman periods.

In the future new information supplied by the LiDAR survey will be used to aid and stimulate research into the history and development of Levisham Moor and other areas in the North York Moors, as well as informing management, presentation and interpretation. LiDAR does not remove the need to confirm details on the ground and there is always work to do to look for associated features that may not be visible on the LiDAR, but it is enormously helpful in the quest for increased archaeological knowledge.

End of an era

Our Senior Archaeologist is taking phased retirement, so before he goes he has been asked to reflect on his time with the North York Moors National Park.

Graham Lee – Senior Archaeological Conservation Officer

graham-leeHow do I sum up a career lasting over a quarter of a century in a few paragraphs? It is a strange feeling to have 26 years seemingly flash by so fast.

I started work for the North York Moors National Park in April 1990, having previously worked in the archaeology section of North Yorkshire County Council since the summer of 1983. I had decided many years before that I loved the north of England and had no desire to return to my southern ‘roots’.

Graham had decided many years before that he loved the north of England, whatever the weather ... Copyright - NYMNPA.One of my first tasks with the National Park was the completion of a management survey of one of our large estates, encompassing moorland and large blocks of forestry. This quickly whetted my appetite for the excitement of making new archaeological discoveries – often very subtle earthworks, no more than a handful of centimetres in depth or relief – despite an exceptional tradition of previous high quality archaeological fieldwork in the region. Working solo in large blocks of conifers was a good test of dedication – crawling under the branches of dense stands of conifers searching for vague earthworks mapped in the 1890s – and the steadiness of nerve, when yet another wretched pheasant exploded out of the leafy vegetation where I was just about to step! In recent years the delights of discovery have been broadening thanks to new technology and techniques, especially LiDAR which provides an aerial view through tree and ground-cover vegetation of archaeological remains that were previously hidden or obscured.

If you have a passion for the past, the North York Moors have something for pretty much everyone – enigmatic Neolithic rock art; surviving prehistoric pitted boundaries and avenues; upstanding Bronze Age funerary monuments and field systems; Roman encampments; medieval castles and monasteries…

Human industry is also well represented – from the earliest iron industry through the search for alum into the full-blown “iron rush” of the mid 19th century, the exploitation of coal and jet, and the plentiful local rivers managed to provide motive power for a range of watermills. Research and conservation priorities relating to these local industries finally led to our new HLF Landscape Partnership Scheme, This Exploited Land of Iron. Some 15 or so years in gestation, it is very rewarding to see new generations captured by the excitement of the important remains of our 19th century ironstone industry and the associated development of early railways – although the original scheme for a canal link between Whitby and Pickering would have been a sight to behold and a major tourist attraction if it had ever been built.

Into the 20th century, remains survive here from both world wars – in the form of coastal defences, army camps as well as troop training and target practice areas. Finds are still occasionally made of 2nd World War unexploded ordnance in former training areas across the North York Moors, in particular after the wildfire on Fylingdales Moor in 2003 which affected two square kilometres of heather moorland.

Fylingdales Moor after teh wildfire in 2003. Copyright - NYMNPA.

Although an environmental disaster – the severity of the fire in reducing the shallow peat cover to ash, this event was an archaeological revelation. Virtually everywhere you looked, subtle archaeological remains became visible, including the drip gulleys around former prehistoric round houses, low stony prehistoric boundaries and cairns, large numbers of previously unrecorded examples of Neolithic rock art and occasional shallow trenches which resembled grave cuts with a subsiding infill. As numbers of the latter quickly increased their interpretation became clear – slit trenches from 2nd World War troop training. I remember my first visit to the site after the fire when the ground was reddened and blackened, covered in ash and still smouldering; few trees had survived and many had toppled after the peat holding their roots in place had been burnt away. Flashes of colour were very noticeable, such as an adder emerging from its underground refuge having survived the conflagration. A major project ensued, both to protect and restore the moorland habitat and to record and investigate the breath-taking remains of surviving archaeology.

Rosedale Calcining Kilns in a perilous state. Copyright - NYMNPA.There have always been new specialisms to get to grips with. A visit to the Scheduled Rosedale iron calcining kilns with the Park’s Conservation Director at the time revealed that a portion of one of the kilns’ firebrick linings had collapsed the previous winter. This led to a major conservation project to stabilise these huge monuments which ran for three years in the mid 1990s, a forerunner of This Exploited Land which will continue the efforts to conserve these monumental sites 20 years on.

Conservation project to stabalise the Calcining Kilns in the 1990s. Copyright - NYMNPA.

It has been such a pleasure working with like-minded and dedicated professionals, both in my own National Park, but also with colleagues throughout the family of British National Parks, and Historic England and Natural England. We’ve shared experiences and ideas to the betterment of our discipline from research to management, and also shared the excitement of attempting to bring our subject, which we love, to life for anyone who cares to see and to get involved.

Graham at work - examining finds at an archaeological excavation - Coxwold Creative Minds Project, March 2006. Copyright - NYMNPA.

The National Park Authority is currently looking for a new Senior Archaeologist to lead on archaeology in the North York Moors. The closing date for applications is 26 January 2017.

Patience and perserverance

We’ve launched a new concerted effort against two of the most threatening non-native invasive plant species in the North York Moors, bolstered by funding from Yorkshire Water over the next four years. We’re chasing down Himalayan balsam (Impatiens glandulifera) and Japanese knotweed (Fallopia japonica) in the River Esk and River Rye catchments.

As well as damaging existing ecosystems and decreasing diversity, both these species tend to overwhelm other plant species along river banks and the danger from this is that during the winter when these non-natives die back the banksides are left bare of vegetation so subject to erosion which increases the sediment getting into watercourses and smothering the water habitat.

Both plants are vigorous growers and virulent spreaders. Himalayan balsam disperses thousands of seeds per plant through exploding seed pods that can propel the seeds metres from the original plant. If the plants are next to watercourses the seeds can be carried downstream to colonise new areas. Japanese knotweed spreads through its underground rhizomes which are so effective that all remnants of the plants need to be carefully disposed of because even a small fragment of rhizome if given the chance to re-root will form a new plant.

The only way to have any real impact on the plants is to tackle them systematically starting at the top of catchments and moving downstream, and repeating the control year after year to remove any vestiges of the plants. This new funding will provide a much needed boost to efforts made over the last few years.

Himalayan balsam (Impatiens glandulifera) - it has a sickly, sweet smell, pink flowers and a bright green hollow stem. It can grow up to two meters tall. Copyright - NYMNPA.

Japanese knotweed grows to around three metres tall and has large alternate heart shaped leaves and a characteristic zigzag stem covered in purple speckles. Its flowers, which appear in late summer, consist of clusters of tiny creamy-white flowers. Copyright - NYMNPA.

We’ll be surveying the current extent of the plants and then resurveying each year to monitor the effects of the control. We’re using tried and tested control methods – hand pulling the Himalayan balsam before it gets the chance to seed and propogate, and treating individual Japanese knotweed plants with directly administered glyphosate injections to carry the chemical down into the rhizomes. We’ll be using contractors and volunteers to carry out the work coordinated by National Park staff.

Controlling and hopefully eradicating non-native invasive species in an area takes a long time. Simon, our River Esk Project Officer, is a real enthusiast for non-native invasive species control because he sees the detrimental effects the plants have on the river environment and on his beloved Freshwater pearl mussels. He can see the years of attrition starting to pay off as native vegetation starts to recolonise sites where invasive species have been removed.

“The secret of success is constancy to purpose” — Benjamin Disraeli

Discovered by Disaster

Aside

Prehistoric ‘cup and ring’ rock on Fylingdales Moor - photo by Jen Heathcote.

Fylingdales Moor on the eastern edge of the North York Moors features in an Historic England blog post from July on archaeological discoveries that came to light due to environmental change. In the case of Fylingdales Moor it was a severe wild fire which was devastating to the natural environment at the time – but from an archaeological point of view every cloud has a silver lining …

via Discovered by Disaster: 6 Astounding Archaeological Finds from Environmental Change — Heritage Calling

Habitat connectivity: back to basics

John Beech – Land Management Adviser

Currently this National Park Authority has two strategic priorities: one is to promote the North York Moors and the other is to improve the connectivity of habitats in order to benefit the biodiversity and landscape of the area, and mitigate the encroaching impacts of climate change.

Habitat connectivity features quite heavily on our Blog; that’s because it’s important to us. Habitat connectivity is the main driver for the work of the Conservation Department. It’s generally accepted that some of the most (ecologically) important habitats within our countryside have declined and fragmented over the decades and good quality habitat now tend to only exist in isolated pockets across the landscape. The first step is to conserve these remnants and then go on to establish connections, buffers, corridors, stepping stones – linking and increasing the habitat resource and therefore its sustainability into the future. These connections, buffers, corridors, stepping stones allow animals, birds, plants to move through the landscape between the habitats they need which helps populations thrive and grow (helping to mitigate the effects of climate change) – ‘stitching’ the landscape back together for wildlife.

Imagine a habitat e.g. native woodland and the biodiversity that depends on it e.g. oak, ash, birch, hazel, bluebell, wood anemone, wild garlic, great spotted woodpecker, nut hatch, wood warbler, tawny owl, ringlet butterfly, feathered thorn moth, barbastelle bat, wood mouse, not to mention the ferns, fungi, lichens, mosses, beetles and spiders etc. etc. We want to better the condition of existing native woodland habitat, to increase the extent of native woodland habitat, to create new native woodland habitat, and to ensure native woodland habitat is better connected; all to ensure a linked landscape for native woodland and the wildlife that depends on it.

Woodland with bluebells, near Hawnby - copyright NYMNPA

So what does this mean in practical terms?

Back in 2012 we sat down with a map of the National Park and considered where we were at. As discussions developed a clear picture of where concerted effort was needed began to emerge. We knew more or less where the surviving key habitats were and we also knew where we wanted to enhance other habitats more generally e.g. the areas which had been key habitats in the past and could benefit from restoration. Key habitats such as Ancient Woodlands, species rich and semi-improved grasslands, riparian strips and coastal hinterland were used as focuses around which to plan for greater connectivity. In the North York Moors, heathland/moorland which makes up around a third of the National Park would seem a likely key habitat but as this is already well connected with large expanses stretching as far as the eye can see, it does not require the attention that more isolated habitats do in terms of habitat connectivity.

We identified the strategic corridors where our efforts would be best focused in our 2012 Management Plan. We then identified the key ecological gaps along these corridors as well as a number of essential gaps to address more widely – 132 of them in total.

Strategic Connections Map from the North York Moors National Park Management Plan 2012

Target Connection Sites map from North York Moors National Park Business Plan 2012

What we then needed was a method of implementing our thoughts and vision. We draw polygons around the gaps to provide a framework for practical implementation. Officers are assigned individual or groups of polygons and using the original objectives for each ecological gap (e.g. restore PAWS to having Ancient Woodland characteristics, develop a mosaic of habitats, enhance species rich grassland) we develop rationales setting out what might be done on the ground and how best to do it. If we are going to carry out work and spend money in these target areas we need to establish sound reasons for doing so and to be able to justify our decisions. We start by carrying out a desk study of the habitat interest and records in that area – this includes previous habitat surveys, species information, existing and previous agri-environment agreement areas, public access, historic environment records, designations, and aerial photography. The records are important because as well as looking for opportunities we need to also consider potential constraints such as the historic environment because we don’t want to accidentally damage a valued feature by attempting to achieve the aims of Habitat Connectivity.

Once we have this background picture of a target area we need to get our boots on and get out on the ground to see what’s really there. We’re looking initially from Public Rights of Way only (unless specific permission to access the land has previously granted) – we need to assess how much of the information we have matches the real situation on the ground. A key requirement is to take good quality photographs (both of individual habitats and the wider landscape) as well as making accurate field notes, annotating our original maps and at the same time looking out for possible linkages across the landscape. As our main habitat survey information (a Phase 1 Survey) is nearly 30 years old it is not always still accurate as habitats have changed and shrunk since then. This is especially true of unimproved grasslands identified in the late 1980s where scrub, bracken and bramble succession has since encroached.

Once back in the Office with the results of the field work, we consult with specialist Officers (Rona the Senior Ecologist, Mark the Woodland Officer etc.) to agree the best way forward i.e. how to make a difference. A plan of action is developed using the following principles:

  • Identify – find and assess the current condition of the key habitats.
  • Protect – ensure that quality habitats are in some way ‘protected’ i.e. conserved. If there are particularly important species e.g. breeding waders, making use of a habitat e.g. rough pasture, that habitat might be enhanced but shouldn’t be transformed.
  • Enhance/restore – most areas of habitat need some form of continuing care and maintenance to prevent decline or loss.
  • Expand – are there any adjacent buffer areas of land that could be incorporated into the habitat?
  • Create – establishing new areas of habitat nearby – this is easier for some habitats e.g. woodland than others e.g. grassland. Long term commitment is required.

To take forward any ideas the involvement of landowners/land managers is essential. In many cases for a land manager and their family the land is their living. To protect, enhance/restore, expand or create the landowner/land manager has to be willing. We’re talking about facilitating capital works like fencing to control stock, scrub control, tree/hedge planting, spreading wild flower seeds, cutting grassland, managing woodland etc. Following negotiations, the National Park Authority can provide grant assistance, use its own Volunteers and Apprentices to carry out the required tasks, or buy the necessary materials and the land manager provides the labour. Longer term requirements are met through maintenance clauses or land management payments over time.

Then once the work is organised and underway, at some point we need to be able to declare whether the gap has been addressed and the looked for key ecological connection made, or rather is on the way to being made. We do that by returning to the rationale – have we been able to achieve what was identified as being required at the beginning of the process?

Although the process takes time it is necessary in order to ensure that we achieve the best workable and sustainable linkages we can.

Little Fryupdale - copyright Mike Kipling, NYMNPA

Falling leaves divulge our industrial past

Louise Cooke – This Exploited Land Heritage Officer

One of the tasks that we undertook during the just completed Development Phase of the This Exploited Land (HLF Landscape Partnership) programme was to try and establish a better understanding of the landscape character of the programme area.

Map of TEL area - submitted October 2015. By NYMNPA.

Understanding, analysing and describing the character types of the landscape includes some obvious ‘easy hits’ – wide open moorland, farmland, river corridors, enclosed wooded valleys. In each of these different landscapes in the This Exploited Land (TEL) area industrial archaeology has left a significant legacy.

For example, the industrial archaeology features are relatively straightforward to see in Rosedale. Alongside the well-known monumental kilns on both sides of the dale, it is possible to make out the flattened ‘terrace’ that marks out the line of the Rosedale Railway, and the ‘inclines’ that mark out the tramways bringing the ironstone from the mine entrances to the calcining kilns for processing. Whilst there are features that are unmapped (or which we are not quite sure how they actually ‘worked’) the industrial archaeology of Rosedale is easy to see in the landscape and so help to present the story of the dale’s industrial past. Rosedale East landscape - can see the surviving monuments and earthworks. Copyright NYMNPA.

But imagine that Rosedale was not an open moorland setting, but was rather in one of the enclosed wooded valleys. All that was easy enough to make out is suddenly very difficult to see and without seeing the features it is very hard to read the story of past industrial exploitation.

This is the case with the Murk Esk valley between Goathland and Grosmont, which today contains a mixture of broadleaved and conifer woodland, including Plantations on Ancient Woodland sites (PAWS) indicating there has been woodland on the site for a long time. But in addition, from c. 1840s – 1890s the valley was a scene of heavy industry including mineral extraction (ironstone and whinstone), calcining and ironworking (at Beck Hole and Grosmont), and associated domestic life.  This includes ‘key’ sites such as Beck Hole Ironworks, Grosmont Ironworks, Combs Wood, Blue Ber Wood and Holme House mines. Much of this industrial past is now ‘lost’ or hidden beneath the trees and it is very difficult to isolate, access and interpret the significant remains that are within the areas of dense woodland.

Murk Esk Valley. copyright Stephen Croft NYMNPA.

I’ve walked the route from Goathland to Grosmont with my children several times and they like the trees, really enjoy the river, but they don’t ‘see’ this as a historic place – it doesn’t have ‘easy’ to see ruins or landscape features – rather all they see is the trees, and these are somehow ‘old’ and must have always been there. The natural environment has subsumed the historic environment. As such the significance and value of the Murk Esk valley and the vital importance it played in the development of the ironstone industries and railway technologies is very hard to understand.

Industrial remains within Murk Esk woodland. Copyright NYMNPA.

Industrial remains within Murk Esk woodland. Copyright NYMNPA.

LiDAR

LiDAR survey employs a laser based instrument which transmits high frequency laser pulses and records the reflected signal which can be used to generate very accurate topographic map data even beneath woodland canopy. LiDAR is one of many ‘remote sensing’ technologies that are used by archaeologists to survey sites from the air – a ‘teched-up’ development from conventional aerial photography.

LiDAR has been used with spectacular results for archaeological discoveries around the world such as Angkor Watt, Caracol and here in the UK in the New Forest National Park (amongst many others). As it enables a landscape-scale approach it is particularly suited to documenting archaeological landscapes and features in a number of other HLF Landscape Partnership Schemes such as TEL. Although much of England is already covered by LiDAR data held by the Environment Agency (who need to understand topography and land use, including creating flood models and assessing coastal change) – the currently available coverage in the Murk Esk valley wasn’t available in sufficient density to make this useful as a tool for identification of the archaeological features beneath trees.

TEL LiDAR coverage map, coloured based upon broad elevation, showing the LiDAR survey area over the Murk Esk and the TEL data limits bordered in red. Bluesky/NYMNPA.High density LiDAR surveys enable us to ‘see’ beneath the trees and other vegetation where the laser beam has passed between the branches of the trees and been reflected from the ground beneath. So we commissioned our own survey of the Murk Esk valley to be undertaken in ‘leaf-off’ conditions – in the very short window between the leaves falling of the trees and vegetation and the new buds and growth forming – therefore increasing the possibility of the laser beam passing through the branches to the ground beneath. During the end weeks of winter I was spring-watching with increased nervousness in anticipation of the perfect combination of ‘timing’ and ‘weather’. Fortunately our survey was undertaken on the 9 March 2015.

 

Murk Esk LiDAR coverage in grey-scale overlain upon Google Earth map using virtual shading to highlight relief (with lighting from the south-east ) and in multi-shaded format in which virtual lighting from different directions is coloured differentially to enhance feature visibility. Bluesky/NYMNPA.We have now started to use the results to give us a much better understanding of the landscape character of the Murk Esk valley. The survey has demonstrated that the TEL landscape still contains significant unknowns, and there is a wealth of historic and natural heritage information that can be discovered, amalgamated and better understood. The verification of these results, mainly through ground truthing, will be a central element of the community archaeology and volunteer programs delivered through the TEL programme should HLF funding be secured for its Delivery Phase.

LiDAR - Beck Hole Ironworks - a number of industrial structures are served by sidings from the railway line. Bluesky/NYMNPA.

Ordnance Survey 1st Edition 25 inch map 1893 - Beck Hole Ironworks - a number of industrial structures are served by sidings from the railway line. © and database right Crown copyright and Landmark Information Group Ltd. All rights reserved North York Moors National Park Authority 100021930 2015 LM000373 2015.Aerial photography 2009 - Beck Hole Ironworks - a number of industrial structures are served by sidings from the railway line. © GeoPerspectives 2009. All rights reserved.

 

 

 

 

 

 

 

With our industrial past revealed by the falling leaves last winter, the scale of the ‘unknown’ is surprising particularly given the relatively recent past represented by the histories of early railways and iron making in the North York Moors. The past is still there to be discovered.