Winter bird crops feeding more threatened birds every year

photo-by-romano-da-costa-1By Cris Sellarés

The Winter Bird Crops are going from strength to strength looking at the way the birds are rushing to get to them. Results from last winter’s surveys at the crops show an increase in bird numbers of almost 40% in density (birds per hectare), even when the number of fields and area planted did not increase from the previous year. Most encouragingly, the vast majority of birds feeding at the crops were the targeted species: farmland birds such as chaffinch, linnet, reed bunting, meadow pipit, goldfinch and starling.

The winter bird crops are crucial to keep hundreds of birds fed and alive throughout the winter, when there is not much food to be found in the fields or hedges. Many of the species benefiting from them are threatened right across their British and European ranges, and include local birds and migrants who come to spend winter here.

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You can download and read the full report 2015-16 Winter bird crops report here. Here are the highlights:

  • photo-by-romano-da-costa-4Farmland birds are in decline across Europe, the UK and Jersey, with some species having become locally extinct and many others considered threatened. One of main reasons of these declines is lack of food during winter which causes high levels of mortality. The so-called ‘Winter Bird Crops’ provide a source of food at this critical time, increasing the chances of survival of many threatened birds both local and migrants
  • Birds On The Edge works with Jersey’s potato farmers to provide winter bird crops for the longest time possible. A variety of crops are planted with staggered management regimes, ensuring that the crops do not disappear at once when the fields are planted with potatoes. The crops provide seeds and grains of various sizes, energy and nutritional values
  • In 2015 a total of 47 fields were planted to feed farmland birds during the 2015-16 winter. The fields were found at 12 different sites, and, combined, covered a total of 33.3 hectares (163 vergées)
  • The development of the crops and bird activity was monitored throughout the winter. A total of 46,155 records of birds of 54 species were collected over sixteen surveys, of which 40,949 (88.7%) were of target species (endangered farmland birds)
  • Of the ten most abundant species found at the crops, seven were farmland (target) species: chaffinch, linnet, starling, goldfinch, greenfinch, meadow pipit and reed bunting. A total of 14 target species was recorded at the sites. The most successful site had an average of 461 target birds per hectare
  • Net numbers increased by 13,874 birds compared to 2014-15 (54% increase) and by 33,177 compared to 2013-14 (534% increase)
  • The overall density of target birds increased by 39% from the previous winter (2014-15) and by 140% compared to the winter of 2013-14
  • The seed for the bird crops was purchased and provided thanks to the generosity of a private donor. It costs approximately £3,500 to plant the winter bird crops in Jersey
  • This year’s crops, which are already feeding birds in larger numbers than ever recorded, were paid for by the local charity Action For Wildlife and by the States of Jersey’s Countryside Enhancement Scheme
  • Our research proves just invaluable the crops are for these vulnerable species and we believe that continuing this scheme is paramount for their survival. As we begin to plan for next year’s crops with the farmers, Action For Wildlife has stepped up once again and donated £1000 towards the seed for next year’s crops. This will be added to a private donation of £200 we received in the autumn, as we close in our target of £3,500.

Read the full report 2015-16 Winter bird crops report

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Les Minquiers – A Natural History. Part 2

minquiers-30-7-2016-photo-by-hgyoung-27Marine habitats

Intertidal habitats

The intertidal habitat map has been compared with aerial photographs taken in 1944, 1980, 2003 and 2005. This suggests that the intertidal area at Les Minquiers is in good condition and there has been little measurable change in the type, size and location of its habitats. With the exception of some sand movement, the reef’s intertidal ecology seems to have remained stable during the past 70 years.

Unfortunately, not measurable from historical aerial photography is small scale ecological damage that can result from activities such as low water fishing and boating, such as not returning boulders. In 1956 it was reported that ormer fishermen were not returning rocks and that this was killing off under-boulder fauna to such an extent that it was affecting shellfish stocks on the reef. Survey work at Les Minquiers since 2013 suggests that while some ormer fishermen still do not return rocks, this is not happening enough to cause widespread habitat and species destruction.

Low water fishing activities should periodically be quantified to avoid some of the problems that have occurred on the nearby Chausey Islands. Compared with the French coast, pursuits such as raking, digging and ormering are at a low level on Les Minquiers and much that does occur tends to be within the anchorage at Maîtresse Île or on adjacent sandbanks. Raking has the potential to disrupt or destroy stable infaunal communities and is especially problematic in areas of eelgrass but when conducted on a small scale, habitats can recover and be repopulated from nearby areas. Promoting good practice regarding low water fishing will assist with the conservation of key intertidal habitats. Other potential but currently minor problems include the placing of moorings in eelgrass areas, the dumping of fishing gear and the threat from oil or other chemical spillages.

the-intertidal-environment-at-les-minquiers-is-diverse-and-mostly-pristine

The intertidal environment at Les Minquiers is diverse and mostly pristine. From Les Minquiers – A Natural History

Subtidal habitats

Assessing the nature and quality of subtidal habitats at Les Minquiers has been problematic and there is much work left to do in this area. Diving, aerial photography and fisheries data all suggest that the seabed from chart datum to around five to ten metres in depth is probably in good condition with little obvious evidence of degradation. An exception to this is an eelgrass area to the south-west of Le Rocher du Sud which, in 2003, showed clear evidence of having been heavily dredged causing considerable damage.

Deeper water areas have not been assessed since the 1970s but modern fisheries data indicate that the seabed to the east, south-east and north-east of the plateau has been regularly fished using mobile gear. The state of these seabed areas has not been ascertained but it is possible that they may have been damaged by commercial fishing and be in a degraded condition and/or affected by the accumulation of the American slipper limpet (Crepidula fornicata).

Some form of seabed survey, possibly by remote camera, is desirable, especially in areas that the PhD study of Retière (1979) records as having had maerl. Non-mobile métiers, such as potting and line fishing, do less harm and, apart from instances of lost gear, are unlikely to cause long-lasting seabed damage.

Rocky subtidal habitats are of less interest to dredgers and trawlers and evidence from divers, and the fisheries data, suggest that there has been little damage to rocky reefs or large areas of exposed bedrock on the seabed. Subtidal rocky habitats contain many delicate species such as sea fans, sponges and anemones and should be conserved whenever possible.

a-sponge-on-les-sauvages-a-particularly-important-underwater-site-to-the-south-east-of-les-minquiers

A sponge on Les Sauvages – a particularly important underwater site to the south-east of Les Minquiers. From Les Minquiers – A Natural History

Marine Species

A general lack of data pre-1992 makes it difficult to discern any population trends for marine species found at Les Minquiers. There is sufficient anecdotal information to suggest that a number of species have either disappeared from the reef or have noticeably declined. This includes the conger eel, sea bass, common octopus, slipper lobster, flat oyster and eelgrass, although their decline is probably related to factors outside of the reef such as regional overfishing, disease and climatic events. A severe decline in the ormer population is related to a combination of historical overfishing and, in 1999, disease. There has been some recovery since the 1990s but the population is at an historical low and further conservation measures may be needed to assure the ormer’s long-term regional future.

The reef has also gained some new species, some of which have migrated up from southern Europe and there are seven invasive species that have arrived from neighbouring coasts. Invasive species can present a real threat to the local marine environment and some, such as wireweed (Sargassum muticum), have permanently changed habitats within Les Minquiers. Fortunately, the Plateau des Minquiers seems to have fewer invasive species than neighbouring coasts although it is possible that the American slipper limpet may be affecting deeper water sediment areas. It is only through international regulation and meaningful biosecurity measures that future arrivals can be minimised in the north-west European area.

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Over 600 marine species are known from Les Minquiers. From Les Minquiers – A Natural History

Biodiversity on Les Minquiers

The table below summarises the number of species recorded from Les Minquiers from three separate periods of time: pre-1950; 1950 to 1999; post-1999. These periods broadly reflect elevated levels of recording that occurred either side of World War II and individual surveys during the 1950s, 1970s, 1990s and at the start of the current century.

It is probable that the number of species recorded on Maîtresse Île is an accurate reflection of the island’s overall biodiversity and that there has been a loss of plant and breeding bird species since the end of World War II. The resident arthropods have probably remained stable and may even have increased with the renovation of the huts from the 1970s onwards. Microscopic animals, such as mites and diatoms, and lichens have only recently been studied.

It is probable that the number of recorded marine species in the table is an underestimate with the total diversity probably being double or treble this total. Further targeted research will produce more records, especially in subtidal areas. Historical records are not good enough to discern whether there has been a decline in most marine species although this it is suspected in some cases.

a-summary-of-biodiversity-on-les-minquiers-for-three-time-periods-pre-1950-1950-1999-post-2000-together-with-the-total-number-of-species-recorded-overall

A summary of biodiversity on Les Minquiers for three time periods: pre-1950; 1950-1999 and post 2000 together with the total number of species recorded overall. From Les Minquiers – A Natural History

Environmental threats, causes and solutions

The information gathered during the course of this project suggests that Maîtresse Île is under considerable environmental pressure. Of particular concern is the issue of soil erosion which presents an immediate threat to the island’s wildlife and infrastructure. Addressing it is primarily a matter of awareness, stakeholder cooperation, management and infrastructure maintenance although there are some factors, such as rising sea levels, that cannot be tackled solely at a local level.

In the marine realm the greatest threat is from the fishing industry and especially the use of mobile gear (such as dredges and trawls) on the seabed which can cause serious and irreparable damage to habitats and species. A review of ecosystem services suggests that Les Minquiers is an area of high biological productivity with habitats that make it an important nursery area for commercial fish and shellfish species. This has been suspected for some time and as early as the 1930s it was suggested that the reef was important to regional fish stocks.

It is probable that conserving the nursery function of Les Minquiers will have a greater long-term economic return for the fishing industry than the short-term rewards gained from damaging its benthic habitats. It is, therefore, important that as much of the reef as possible is designated as a no mobile fishing gear zone but especially the shallow marine habitats on the Plateau des Minquiers most (but not all) of which are at present undamaged.

Some other common solutions include the need for increased management, monitoring and awareness and there are a number of major potential threats (such as climate change, oil slicks and invasive species) that require international cooperation. However, in the short term it is local and regional management that offers the best and most immediate means of conserving the key ecological, infrastructural and cultural attributes of Les Minquiers.

Historically Les Minquiers has been managed via an informal relationship between the States of Jersey, the Crown, hut owners and regional fishing authorities. However, in recent years other organisations and groups have been founded whose remit covers the reef including the Ramsar Management Authority, the National Park and the Maîtresse Île Residents’ Association. Exactly how the reef should best be managed and how this may best be accomplished without becoming intrusive or overbearing to its stakeholders, remains a matter for discussion.

About Les Minquiers Project

The project to study Les Minquiers was begun in 2012 by three members of the Société Jersiaise’s Marine Biology Section. They had been working on Les Écréhous and Paternosters and were aware of the importance and fragility of Jersey’s offshore reefs. They were aware that little was known about Les Minquiers and decided that they would take a look to see what could be done to rectify this.

The initial plan was to just look at the reef’s marine biology (its most obvious natural asset) but it became quickly apparent that almost every aspect of Les Minquiers needed documenting. The team soon expanded to include botanists, ornithologists, entomologists, divers, geologists, archaeologists, meteorologists and all manner of other specialists. Every conceivable thing was studied, from single-celled organisms through to the reef’s complex political and cultural history. In the end the project had nineteen principal contributors plus over 50 others who assisted with fieldwork, data crunching, logistics and archive research.

The projects results have been written up into a book which is available in a limited edition hardback (from Société Jersiaise only here) and a paperback. Any profit from the hardback edition will be used to pay for the project’s cost, most of which has been funded by the participants themselves.

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Le Minquiers – A Natural History

 

December volunteer activity

photo-by-department-of-the-environmentSunday 11th December 2016 – St Peter – 10:30-13.00

Why not take a break from the Christmas shopping this Sunday and join us to learn a new skill (or hone an existing one) and plant some trees!

From Jersey Conservation Volunteers

The details

We will be getting together again with Conrad Evans and the team from Jersey Trees for Life to provide a Christmas present for Jersey’s wildlife!  We will add to the organisation’s hedgerow campaign by planting native trees and shrubs around field boundaries to provide habitat corridors for the wildlife of St Peter.

Please contact Julia at j.meldrum@gov.je or Jon at jonparkes@nationaltrust.je or phone Julia on 441600 or Jon on 483193 before you go just case anything changes.

The site

Meet at the Jersey Wanderers car park off La Rue des Sauvalleries, St Peter (south of Jersey Rugby Club). Parking is by kind permission of Jersey Wanderers.

Jersey phone directory map 7, M14. Google maps here

Parking  There is parking at the meeting point.

The task Planting trees and shrubs.

Tools needed As always, we can supply some tools, but please bring your own if you have them. We are very limited on the number of spades we have available so bring yours along if you have one (please note that trowels, shovels, and garden forks are not suitable for this task).

Clothing needed Bring gardening gloves (though we can supply a pair if you don’t have them), wellies or sturdy boots, (it could well be muddy and the vegetation may be wet it and it may be rough underfoot) and common sense clothes to cope with the elements, we go ahead whatever the weather!

Children All are welcome, young or old. Children under 16 must be supervised by a parent or guardian during the task.

Work will be finished by 13.00. And, our very own Christmas angel Kim will supply hot drinks and her legendary homemade cakes at the end of the task.

Hope to see you there!

Les Minquiers – A Natural History. Part 1

les-minquiers-photo-by-mick-drydenles-minquiers-bookFollowing publication of the landmark book Les Minquiers – A Natural History Birds On The Edge asked one of the authors, Paul Chambers, to discuss the book and these remarkable but poorly known islands.

Situated just 12 miles south of St Helier, the tangle of rocks, reefs and sandbanks that form Les Minquiers is a world entirely removed from the bustle and traffic of Jersey life.

At 300 km2 the Minquiers’ plateau is larger than most British cities and yet at high tide only 0.002 km2 remains above the sea. Six hours later (and drop in sea level of up to 13 metres) and the area of exposed seashore expands by some 10,000 per cent to 20 km2. The reef holds around 20,000 individual rocks the oldest of which are at least 640 million years old. The one vegetated island, Maîtresse Île, has a rich prehistoric archaeology which suggests it has been regularly used by humans over the past 4,500 years.

This wonder of the natural world is sat on Jersey’s doorstep and yet until recently very little was known about the history or natural history of Les Minquiers. ‘There is perhaps no area of comparable extent in the British Isles about which so little is known,’ wrote the celebrated geologist Dr Arthur Mourant in 1977. This remained true until 2012 when a small team from Jersey’s Société Jersiaise set out to document the reef’s marine and terrestrial biology.

Following the recent publication of the team’s landmark book on the history and natural history of Les Minquiers (see book here) we are pleased to present an overview of the current ecological health of Les Minquiers. This has been adapted from the ‘Summary and Conclusions’ chapter in the book.

Introduction

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Les Minquiers. July 2016. Photo by Glyn Young

In 1998 the Jersey in the New Millennium government consultation document stated that Les Écréhous and Les Minquiers ‘may very well warrant SSI [Site of Special Interest] designation and even international recognition but there is an urgent need to recognise their unique character and the ecology/landscape/leisure use linkages in a “national park” style designation akin to that given to Les Mielles. The increase in leisure boating activity and the number of marinas on the adjacent French coast will subject these reefs to increasing people pressure with obvious knock-on ecological impacts’.

Since this was written all of Jersey’s offshore reefs have been designated as Ramsar (Wetlands of International Importance) areas and the terrestrial areas included within the Jersey National Park. Maîtresse Île is scheduled to become a Site of Special Interest (SSI) and has been subject to various management plans, laws, policies and multilateral environmental agreements.

This has drawn attention to the importance of the offshore reefs and yet, until recently, there remained a general lack of appreciation of their histories and natural histories, and an absence of coordinated study, management and monitoring. It was this knowledge gap that inspired a small team of amateur and professional naturalists to spend four years studying all aspects of Les Minquiers, from its history, archaeology and geology to its animal and plant life. Their results are published in the book, already described as ‘an achievement on a global scale’ by The Sunday Times environment correspondent (and author of End of the Line) Charles Clover.

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Les Minquiers. April 2011. Photo by Glyn Young

Aside from providing a comprehensive overview of every aspect of Les Minquiers, the project’s results provide much of the basic information that is needed by local, national and perhaps international authorities to make decisions regarding the reef’s present-day management, as well as to develop strategies to safeguard its future.

Presented below is a summary of those results and conclusions that most concern the general environmental and ecological health of Les Minquiers, especially those which might have some relevance to the reef’s future management.

These should not be taken as an exhaustive summary of all the project’s results as much other information is provided in the book and a reading of the relevant chapters is recommended. Regardless of how the information derived from this project is used in the future, the authors would like to think that their work does fulfil the ‘urgent need to recognise the unique character’ of Les Minquiers, as requested by the States of Jersey in 1998.

A summary of physical and environmental change

Presented below is a summary of key facts and conclusions relating to the current and historical  environmental status of Les Minquiers. This includes aspects of the reef’s archaeology and oceanography but does not include summaries of information relating to the human and geological history of the reef unless it touches on ecological and environmental matters.

Physical Geography, Oceanography and Sedimentology

The general topography of Les Minquiers has probably changed little since the post-glacial sea level stabilised around 2,000 to 4,000 years ago. Much of the plateau is made of hard igneous rock about ten per cent of which is exposed at low water. There has been little opportunity for human activity to destroy or alter the bedrock and so many parts of the reef will present the same profile now as they did when the first Bronze Age hunters travelled to the reef in search of seals.

The main exception to this is Maîtresse Île and several nearby rocks whose physical profile has changed considerably following quarrying in the early nineteenth century. The removal of rock from the north-west and south-east of the island may have accelerated soil erosion by allowing breaking waves to access the area west of the huts. It is probable that some soil erosion had occurred prior to this but quarrying may have accelerated the process.

A second noticeable change in topography concerns the reef’s many sandbanks which build up against rocks or form in the lee of obstacles within tidal currents. An obvious example is the large sandbank known as Le Gris Banc which, since the time of the first hydrographic surveys, has moved steadily eastwards into an adjacent channel. This movement accelerated in the 1990s entirely closing what was once a navigable gap of around 300 metres. Other less strategic sandbanks, such as Le Banc du Turbot, may also have changed shape in recent decades. Although visually remarkable and a nuisance to boaters and chart makers, sandbank movement is probably part of a natural cycle of accumulation and erosion within the reef.

le-gris-banc-a-sandbank-at-les-minquiers-which-has-moved-300-metres-during-the-past-decade

Le Gris Banc a sandbank at Les Minquiers which has moved 300 metres during the past decade. From Les Minquiers – A Natural History

Maîtresse Île

The small terrestrial area of Maîtresse Île has probably seen the greatest change of any place on Les Minquiers. Prior to the nineteenth century Maîtresse Île was a remote, largely untouched, vegetated island with no freshwater which was irregularly visited by fishermen. Then came the quarrymen and more organised fishing from La Rocque Harbour so that by the mid-nineteenth century around 18 stone buildings had been built which were permanently inhabited during the spring and summer months. It is probable that the fishermen managed the island’s vegetation (especially tree mallow) creating habitats for specialist coastal plants such as grasses. Throughout this time soil erosion continued to operate on the western and north-eastern edges of the island.

Maitresse Ile. April 2011. Photo by Glyn Young

Plant life

Following World War II the huts were abandoned, allowing plants and birds to take over. Renovation of the derelict buildings began in the 1970s and, by the 1980s, had led to a new phase of development and occupation by Jersey families. In 2016 just two hut sites remain undeveloped. As huts have been renovated and visitor numbers have increased, so the biology and ecology of Maîtresse Île has gradually changed. This was accelerated by the application of weed killer across the island in 1973 which removed an estimated 99% of all plant life. Erosion was enhanced immediately following this event leading to considerable soil loss.

Tree mallow (with mist net). April 2011. Photo by Glyn Young

Over the past century a total of 26 plant species have at some point been recorded from Maîtresse Île. The most species observed during an individual survey was 16 in 1973, immediately after the weed killer incident when, ironically, opportunistic weeds temporarily appeared. Currently there are eight known species with those plants that have disappeared during the past century mostly being grasses and short species such as thrift. Some of these (including thrift) may have been permanently removed by the weed killer incident while others were possibly crowded out by the tree mallow which currently dominates the island.

It is possible that tree mallow is naturally pervasive on Maîtresse Île and that, left to its own devices, this is the species that will proliferate and dominate. Other historically recorded species, such as grasses and thrift, may have been present only as long as the fishermen were resident and regularly clearing the tree mallow.

Aside from aesthetics, the most important roles of vegetation are to prevent soil erosion and provide food and shelter for wildlife. This is especially true for the island’s bird life with almost all the 92 recorded breeding and migratory species being dependent on the presence of tree mallow.

The destruction of vegetation exposes soil to the effects of waves, wind and rain, causing it to erode rapidly. Since 1928 Maîtresse Île has lost an estimated 50 per cent of its soil cover and it is soil erosion, above all else, that presents the greatest environmental threat to the island’s ecology. Soil provides an anchor for vegetation which is in turn needed by birds and invertebrate animals. Soil also supports hut foundations and contains archaeological material.

Although the issue of soil erosion has been raised several times by archaeologists, little has been done to address it. This should form a central part of any future management plans for Maîtresse Île, especially with regard to the way in which visitors and residents use the island. Without soil, Maîtresse Île will lose its wildlife, its infrastructure and its archaeology. Without soil, the central part of the island will be around a metre lower in height which will permit storm waves to sweep up from the south and east and cross the spine of the island.

Only the high points around the flagpole, Le Gabé and to the west of the toilet will be significantly above the high water mark. In such circumstances the huts and any terrestrial species are unlikely to survive, leaving Maîtresse Île a largely barren rock that, like La Grande Maison, would support only nesting birds, maritime algae and some lichens.

Nesting birds

Another notable biological change to have occurred in recent decades is in the use of Maîtresse Île by nesting birds. The discovery of seabird bones from the Bronze Age suggests that the island has been used as a nesting place for thousands of years. It is unlikely that seabirds would have nested successfully when fishermen were in residence as the nests would probably have been raided or scattered. After World War II birds did nest successfully as the ruined huts provided shelter for shags, gulls and other seabirds. Since renovation of the huts began in the 1970s, there has been a decrease in the number of species nesting so that currently it is only gull species which nest in any number on the rocky areas to the west and north of the huts although, in July and August 2015, a large number of Terns nested on the north of the island for the first time in living memory.

les-maisons-photo-by-mick-dryden

Les Maisons. Photo by Mick Dryden

Disturbance

In recent years weather, inadvertent disturbance and deliberate damage to nests has led to some poor breeding seasons on Maîtresse Île. For example, in 2014 all the gulls’ nests were deliberately destroyed early in the season leading to a disastrous breeding year for the birds. Additional monitoring of when, where and which species are nesting on the island might allow for a more targeted management during the nesting season. A second nesting site exists around the base of the beacon at La Grande Maison which seems to receive little human interference.

There have been many other events and incidents that have affected the ecology of Maîtresse Île in some way. Most of these result from individual acts of ignorance, such as clearing vegetation for camping or picnics, placing heavy machinery on the island and lighting barbecues on bare soil or next to huts. Other actions derive from ignorance or wanton destruction of property and the dumping of litter and chemicals are more deliberate acts.

An increased awareness of the fragility of Maîtresse Île’s ecology amongst visitors and residents will go some way to resolving these problems. Signs, websites and literature (such as posters and leaflets at marinas) should promote a greater understanding of Maîtresse Île and its ecology. There have also been issues around repairs and renovations on the island and it is recommended that future projects (whether by Jersey’s authorities or individuals) are made to adhere to tight management plans which avoid the risk of soil erosion, habitat destruction and pollution.

Climate change

One final and probably unavoidable issue facing Maîtresse Île is that of climate change and rising sea levels. Many different models and claims are made about the cause and visible effects of climate change but evidence does suggest that the global climate is undergoing a warming phase and that the sea level is rising. For low-lying islands and reefs this is not good news, as even small sea level rises risk increased erosion and marine inundation. This may be compounded by a predicted increase in the number and severity of storm surges as the warmer seas create and empower low pressure systems.

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Maitresse Ile. April 2011. Photo by Glyn Young

Between October 2013 and March 2014 the coast of Europe was hit by a series of spectacular storms that rolled in off the Atlantic swamping and damaging coastlines along the English Channel. On Maîtresse Île these storms removed soil from the west of the island, damaged two of the seawalls and undermined the concrete area at the top of the slipway. Similarly, a storm surge in February 2008 damaged a wall and shifted large boulders across the slipway. As the sea level rises, so the destructive potential of waves will move higher up the island placing pressure on the sea defences and further increase the action of soil erosion. This issue is being addressed for Jersey’s sea defences and needs to be addressed for Maîtresse Île too.

The results from this project suggest that Maîtresse Île is facing several immediate threats, the most serious of which are issues relating to soil erosion, habitat/species loss and storm damage. These, and other threats, are best addressed through coherent management and monitoring of the island, investment in infrastructure maintenance, the cooperation of its principal users and raising awareness for visitors and potential visitors.

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Maitresse Ile at Les Minquiers: soil erosion means it gets smaller every year. Les Minquiers – A Natural History

Ten Years of Jersey Toadwatch

common-toad-photo-by-kristian-bellFrom the States of Jersey Department of the Environment

jersey-toadwatch-logoThe Department commissioned Amphibian and Reptile Conservation to analyse and prepare a report on 10 years of citizen science data collected under the Toadwatch survey.

Jersey residents were asked to take part in Toadwatch by reporting sightings of our crapauds (spiny toads) using ponds. Data has now been collected for over 10 years (2005 – 2014) and this analysis has created an up to date toad distribution map for Jersey.  It has highlighted features of the Jersey landscape that are most important for toads and suggested areas to create new breeding ponds.

arc-logoA breakdown of the types of ponds used for toad breeding overwhelmingly supports the suggestion that man-made habitats are critical for the species’ survival in the island. Ensuring that these habitats are maintained and connected across the Island is considered to be a critical task to conserve our toads into the future.

The main document Ten Years of Jersey Toadwatch: Analysis & Recommendations contains much technical information which will allow the modelling approaches described in the report to be repeated in future.

Records of Jersey toads were received from 281 locations between 2005 and 2014 and used to create a distribution map. The same data were used to create a GIS model indicating which features of the Jersey landscape are most important for toads. Ponds and gardens were most important, along with other man-made habitats like parks, golf courses and recreational fields, indicating the reliance of toads on anthropogenic features in the modern Jersey landscape.

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All Toadwatch record locations 2005-2014

a-good-example-of-a-garden-pond-known-to-be-used-by-toads-and-newts-for-breeding-providing-an-excellent-source-of-food-for-grass-snakes-photo-by-rob-wardFurther modelling combined with an analysis of barriers to connectivity between populations (roads) revealed that many toad populations in the centre and north of the Island, especially, are isolated from the larger clusters of breeding ponds found in St. Brelade and St Helier-St Saviour. This can be used to suggest areas where creation of new breeding ponds and other habitat will be most effective as a tool for toad conservation in the Island – specifically:

  1. Between La Crabière and Les Landes, and between St Ouen’s Village and Grève de Lecq, as well as La Crabière and St Peter’s Village (to link populations in the west of the Island);
  2. Approximately between Beaumont and Sorel, and along almost any north-south valleys (to link the St Mary – St John population cluster to other populations);
  3. Eastern Trinity, St. Martin, south-east to Gorey and through Grouville (to restore connectivity in the east of the island);
  4. Approximately between Beaumont and Bellozane (reconnects the southern population clusters to one-another);
  5. Between Noirmont, Woodbine Corner and Ouaisné (the latter population not currently recorded as part of Toadwatch) (to connect Noirmont with other populations and improve population robustness in this key area).

les-landes-toad-site-photo-by-john-wilkinson

Analyses of the Toadwatch monitoring data showed that timing of toad breeding was very variable (starting usually any time between early January and early March) but there was no discernible trend towards earlier breeding. Analysis of any population trends 2005-2014 is difficult due to inconsistencies by recorders; however, the average number of spawn strings per pond was <4, indicating generally small populations. The majority of ponds (81%) also had <30 toads in any one year.

A breakdown of the types of ponds used for toad breeding in Jersey overwhelmingly supports the suggestion that man-made habitats are critical for the species’ survival in the Island. Nevertheless, almost half of the reporters recorded toads being killed on nearby roads – a consequence of their dependence on urban habitats.

Toadwatch has not yet provided much data on other key species (such as grass snakes), though some islanders have begun to record these species. The adoption of an on-line recording system, hosted by Jersey Biodiversity Centre will help improve collection of these data, improve consistency of reporting and allow for more revealing future analyses of e.g. population trends.

Summary of Key Recommendations

  • Create new breeding ponds in the areas suggested to improve population resilience
  • Continue to support collection of Toadwatch data on-line as a key component of monitoring the species’ status in the island
  • Use signage and patrols, where likely effective, to reduce road mortality
  • Update the available information on creating toad habitat/ponds.

Download the report Ten Years of Jersey Toadwatch: Analysis & Recommendations here

Jersey Toadwatch has its own Facebook page here

common-toad-photo-by-john-wilkinson