Category Archives: Bird monitoring

2013 Breeding Bird Survey Part 1: L’Etacq to Sorel Point

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By Cris Sellares

Aims

Meadow pipit. Photo by Paul MarshallThis survey aims to establish the number and location of breeding pairs of selected bird species within the BIRDS ON THE EDGE project area i.e. the Island’s coastal land. We will set out to do this in several sections of the coastland and will start with the north-west coast from L’Étacq to Sorel Point. Data collected will not only allow us to map the most important areas on this coast for the focal bird species (see Birds) but can also be used in future studies on population trends.

We cannot expect to look at all possible bird species so will concentrate on the following ones:

  • Linnet
  • Stonechat
  • Skylark
  • Common whitethroat
  • Dartford warbler
  • Meadow pipit
  • Jackdaw
  • Raven
  • Peregrine falcon
  • Kestrel

Le Don Paton. Photo by Mick DrydenWe will also restrict the survey to a narrow strip along the coast as we already know that none of these birds, except the kestrel, nests further than only a few metres almost, inland from the coastal cliff path. The widest area of habitat suitable for these species is at Les Landes as they do not breed in developed or farmed land. It is likely too that a very high proportion of Jersey’s entire breeding population of several of these species is restricted to the north-west coast.

Methodology

The number and location of the chosen bird species will be established by using information provided through existing ongoing surveys including the Farmland Bird Survey transects at Sorel Pont (two transects), Crabbé and at Les Landes (two transects) and the BTO Breeding Bird Survey (BBS) squares in the area.

The gaps in the study area between the transects and BBS squares will be surveyed by a team of volunteer observers co-ordinated through the Société Jersiaise Ornithology Section. The observers will record the location of breeding pairs and breeding behaviours such as singing, territorial displays, nest-building and food delivery to the nests by direct observation from the coastal path. Each observer will be given maps and a handheld GPS so that they can mark the location of each observation. In many cases more than one visit by different observers might be needed to confirm the location and status of the breeding site.

Results

This quick, easy and enjoyable bird survey will give BIRDS ON THE EDGE invaluable data for producing maps showing the location of each of the most important bird species and numbers that we can compare with repeat surveys over the years. We will also enlarge the survey to cover other stretches of the coast in the next few years.

If anyone is interested in contributing to the survey by spending an hour or two on our beautiful coastline watching the birds please make contact through this website.

 

New study finds pesticides leading cause of grassland bird declines

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From American Bird Conservancy

Meadow pipit. Photo by Paul Marshall A new study in North America has identified acutely toxic pesticides as the most likely leading cause of the widespread decline in grassland bird numbers in the United States, a finding that challenges the widely-held assumption that loss of habitat is the primary cause of those population declines. Download the study for free here

Although this study focusses on the situation in North America it does state that: Common agricultural birds are in decline, both in Europe and in North America. Evidence from Europe suggests that agricultural intensification and, for some species, the indirect effects of pesticides mediated through a loss of insect food resource is in part responsible (for declines).

The scientific assessment, which looked at data over a 23-year period (1980 to 2003) has just been published. The study looked at five potential causes of grassland bird declines besides lethal pesticide risk: change in cropped pasture such as hay or alfalfa production, farming intensity or the proportion of agricultural land that is actively cropped, herbicide use, overall insecticide use, and change in permanent pasture and rangeland.

Common cuckoo juvenile. Photo by Mick Dryden“What this study suggests is that we need to start paying a lot more attention to the use of pesticides if we want to reverse, halt or simply slow the very significant downward trend in grassland bird populations. Our study put the spotlight on acutely toxic insecticides used in our cropland starting after the Second World War and persisting to this day – albeit at a lower level. The data suggest that loss of birds in agricultural fields is more than an unfortunate consequence of pest control; it may drive bird populations to local extinction,” co-author Pierre Mineau said.

Many grassland bird species have undergone range contractions or population declines in recent decades. In fact, analyses of North American birds indicate that these birds are declining faster than birds from other biomes (a situation mirrored in Europe). Habitat protection has long been considered a central pillar in efforts to stem the decline of grassland bird species.

“We are still concerned about loss of habitat in agriculture, range management, and urban development,” said Cynthia Palmer, manager of the Pesticides Programme at American Bird Conservancy. “This study by no means diminishes the importance of habitat fragmentation and degradation. But it suggests that we also need to rein in the use of lethal pesticides in agriculture, and that we need to be especially careful about any new pesticides we introduce into these ecosystems such as the neonicotinoid insecticides. It reminds us that the poisonings of birds and other wildlife chronicled a half century ago by famed biologist and author Rachel Carson are by no means a thing of the past.”

The study found that lethal pesticides were nearly four times more likely to be associated with population declines than the next most likely contributor, changes in cropped pasture – an important component of habitat loss associated with agricultural lands. The publication says that “…..large quantities of products of very high toxicity to birds have been used for decades despite evidence that poisonings were frequent even when products were applied according to label directions.”

The authors argue that only a small proportion of total cropland needs to be treated with a dangerous pesticide to affect overall bird population trends. Pesticide drift from croplands is also affecting birds that favour the adjoining grasslands.

The study found that declines of grassland birds were much more likely in states with high use of toxic insecticides lethal to birds. The current study relies on pesticide data from the 1980s and early 1990s, a time when organophosphates such as Diazinon and Chlorpyrifos, and carbamates such as Carbofuran and Methomyl, were still largely in vogue. Since that time, a new class of insecticides, the neonicotinoids, have soared to the top of global pesticide markets. Unfortunately, a major toxicological assessment soon to be released by American Bird Conservancy puts to rest any notion that birds and other organisms will fare much better under the new pesticide regime. Neonicotinoids have also been implicated in declines of bees – see the latest RSPB statement on use of these pesticides here

Population estimates of birds in Great Britain and the United Kingdom

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From British Birds

Wren. Photo by Mick DrydenThe journal British Birds has published an updated estimate of bird populations in Great Britain and the UK. This follows previous estimates published in 1997 and 2006. There are now thought to be about 84 million breeding pairs of birds in the UK. The ten commonest species contribute 57% of this total, with wren alone providing one in ten of the country’s breeding birds (with 8,600,000 breeding territories). In all, 23 species exceed one million breeding pairs. The individual population estimates come from a wide variety of sources, many from extrapolation of previous estimates by recognised trend measures, others from new surveys and novel analytical approaches developed since the last report. Despite the exceptional level of detail available for some species, many gaps in our knowledge remain. Recommendations are made in the report to allow a continuing improvement in our understanding of the numbers of birds in GB and the UK. There are many opportunities for volunteer and amateur birdwatchers to make a significant contribution.

Atlantic puffin. Photo by Paul MarshallAlthough the figures do not include birds from the Channel Islands the species that BIRDS ON THE EDGE are concerned with are in the list (2006 figures are in brackets):

  • Peregrine 1,500 pairs in UK and Isle of Man (1,283)
  • Atlantic puffin 580,000 breeding pairs (580,799)
  • Turtle dove 14,000 breeding territories (44,000)
  • Cuckoo 16,000 breeding pairs (9,600-20,000)
  • Red-billed chough 930-940 individuals in UK and 450 individuals in Isle of Man (total 1,360-1,367)
  • Raven 7,400 pairs (12,900)
  • Skylark 1,500,000 breeding territories (1,785,000)
  • Common whitethroat 1,100,000 breeding territories (945,000)
  • Dartford warbler 3,200 breeding pairs (1,600-1,890)
  • Stonechat 59,000 breeding pairs (9,000-23,000)
  • Meadow pipit 2,000,000 breeding pairs (1,600,00)
  • Linnet 430,000 breeding pairs (556,000)
  • Yellowhammer 710,000 breeding territories (792,000)
  • Cirl bunting 860 breeding territories (697)

Also of note are the recent colonists and other successes:

  • Little egret 660-740 breeding pairs (146-162)
  • Marsh harrier 320-380 breeding pairs (201)
  • Firecrest 550 breeding territories (80-250).

Jersey’s Great Garden Bird Watch

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The 12th Great Garden Bird Watch takes place this weekend, Saturday 2nd and Sunday 3rd February

Chaffinch. Photo by Mick DrydenIslanders are urged to become involved in monitoring bird life in the Island. The event is coordinated by Action for Wildlife Jersey in conjunction with the Jersey Evening Post (JEP) and all data received will be passed on to La Société Jersiaise to add to their records and included in BIRDS ON THE EDGE bird monitoring analyses. Data from past years’ surveys were included in the 2011 assessment of our birds that became the Island’s first bird redlist The Conservation Status of Jersey’s Birds which can be downloaded here.

How to enter the survey

Collared dove. Photo by Mick DrydenWatch the birds in your garden for any period between
8 am and 11 am on either the Saturday or the Sunday. Note the highest number of each species of bird that you see together at one time during that period – not the total number which enter your garden over the period of the watch. Survey forms and a handy identification guide will be published in the JEP on Thursday the 31st.

Completed forms can be posted in or delivered to the JEP or there is a convenient form for submitting records on line here.

Jersey welcomes visitors. Lots of them!

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Winter lapwing in Jersey, January 2013. Photo by Paul MarshallThe current cold spell in north-west Europe will have been accompanied by the usual media activity in many places. Much of the news generated will focus on the regular “why weren’t we better  prepared” headlines. One group, however, that know exactly what to do when snow comes in the area are the many thousands of birds that winter in the region. While resident birds not used to such cold weather might have to make do, those species that have come from further north are quick to up and move until they find something more suitable. The most obvious places for these versatile wanderers to head for are the coast and offshore islands that are usually much milder than inland areas. And so, with the snowfall on Friday, Jersey welcomed many thousands of new arrivals.

Winter redwing in Jersey, January 2013. Photo by Paul MarshallThe usual clue to a cold-weather migration of this sort is the presence of lapwings on verges and every small field. While big flocks might develop in areas like the fields around St Ouen’s Pond, lapwings may happily feed alone in much smaller areas. The 2-300 lapwings on the Island on Thursday had been joined by possibly over a thousand more by Friday. Several small flocks of golden plovers came in with the lapwings – these two birds often join together in winter.

Winter fieldfare in Jersey, January 2013. Photo by Paul MarshallThe other abundant and obvious visitors are the thrushes. There were already plenty of wintering redwings on the Island but on Friday morning they were joined by many thousands more that had arrived across the parishes in fields and gardens alike.  New blackbirds and song thrushes had arrived too and were obvious as they tried to feed on the roadside at first light. Fieldfares, a bird formerly more common in the Jersey winter when winters were much colder than now, had also come in but only in smaller numbers so far. Interestingly, there are many less waterbird arrivals like ducks and grebes suggesting that so far it is only snow on the fields moving the wanderers and not the kind of cold temperatures that freeze ducks out of their ponds.

Farmland bird monitoring milestone reached

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Counting birds at Crabbe. Photo by Richard E LewisToday we reached a significant milestone when the 2,000th data sheet was input into the Farmland Bird Monitoring database. The first sheet, from Crabbé, was filled out on 1st April 2005 when we made 45 records involving 100 birds of 15 species. The 2,000th sheet, from Les Creux on 19th January, detailed  144 records of 729 birds from 25 species – an event greatly helped by the arrival of heavy snow. At the beginning of this long-term survey there were only five sites being monitored but that has now increased to 18 transects at 16 sites covering farmland, parkland, woodland, heath and unimproved grassland. To date 160 bird species have been recorded including six escapes (three living wild), two feral and two introduced species. The species total includes two identifiable subspecies of white wagtail (most records go under just the one catchall race!) and two yellow wagtails. We have so far input over 80,000 records detailing 200,000 birds!

The data collected in this survey is not suitable to estimate the size of our bird populations at any of the individual sites or for an overall Island figure. This form of consistent data collection does, however, provide a fantastic tool for seeing how our birds are faring both within a year and from year to year.

Line of bird transect, Les Blanche Banques. Photo by HGYoungEach fortnight, 21km of transects are walked once whatever the weather. To date, 24 observers have contributed records with a core of around 10 real diehards who laugh off the horizontal rain and the attention of the many dogs we seem to meet on each transect. The real benefit to a scheme like this will only begin to be seen several years after the start as long term trends in our bird populations become apparent. While some transects have now been counted for nearly eight years others have come in to the project much more recently. The database will allow us to look at population trends at single sites or at combinations of sites. Obviously the biggest benefit will come from the biggTrend in linnet numbers 2005-2010 across five Jersey sites.est size of dataset and at the moment that is the set that comprises of the five original sites (Les Landes, Crabbé, Les Creux, Les Blanche Banques and Noirmont). In the future we will be able to run off graphs like that here for linnet from a combined dataset of maybe 16 sites. The greatest value of this project is in highlighting the status of our Island’s birds, of the environment in which they live and in planning for the future.

So, with this project…..

  • Wren. Photo by Mick DrydenWhat are the most recorded species? Blackbird, robin, wren and great tit seem to be seen most regularly but possibly chaffinch is the most recorded overall;
  • What is the rarest? Luckily for the recorders several of the rarest birds recorded in Jersey have turned up on a transect during a count including solitary and buff-breasted sandpipers. Fan-tailed warbler and firecrest were first found nesting on a transect and the returning cirl buntings were found on one too;
  • And favourites? Each of the counters has their own favourites but the occurrence of bearded tits in St Ouen’s Bay and the possibility in season of migratory yellow wagtails, wryneck and ring ouzel are always highlights. However, little can beat finding a bittern or a long-eared owl stood on a transect staring at the observer!
  • Dunnock. Photo by Mick DrydenAnd the least favourite? Well, surely there are none but some can be a bit tricky at times to pick out as they skulk or when their songs resemble others -dunnocks and garden warblers stand out here (or are too high-pitched for ageing recorders like me);
  • And the saddest? The loss of yellowhammer and steady declines in stonechat and skylark numbers are perhaps most poignant;
  • And the next species? Well, there are some obvious candidates but surely it will be red-billed chough!

 

Two new woodland bird transects added for 2013

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The Farmland Bird Monitoring St Catherine's Woods. Photo by Mick Drydenproject has been further enlarged to include two new woodland sites. The new sites, at Rozel Manor and La Poudretterie (du Scez) near La Saie in St Martin increase the number of woodlands monitored to five with St Catherine’s Woods, Fern Valley and St Peter’s Valley. They also increase the overall project to 18 transects at 16 sites, each to be visited once every two weeks throughout the year. The two new transects are 843 Rozel Manor site with transect. Map by Tim Wrightand 1,543 metres long respectively.

The two new sites are both privately owned and monitoring is done with the kind permission of the owners. Birds recorded will be entered into the project database but will also be used for woodland management trials aimed for 2014 as part of a joint project by the Department of the Environment and Game & Wildlife Conservation Trust.

Le Saie site with transect. Map by Tim WrightEarly visits to the two new sites have found that all the expected birds are present including great spotted woodpecker, goldcrest, short-toed treecreeper and common buzzard. The real excitement, however, might be more in seeing which species are there during the breeding season.

New bird monitoring transect established

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Conservation fields, Sorel. Photo by Liz CorryA further bird monitoring transect has been added to our Farmland and Coastland Bird Monitoring Project. This transect, a second in the Sorel Point to Mourier Valley area, is the 16th that we are counting birds along. As with the other transects (15 at 14 sites), this 1,070m path will be visited once every two weeks from January 2013 and all birds present recorded. The new transect runs along the National Trust for Jersey land on the south of Le Don Linnets near Sorel. December 2012. Photo by Liz CorryPaton. This land will be farmed in a rotation that will be beneficial to wildlife with some of the fields providing food for birds each year. In December 2012 there are over 200 linnets feeding in these fields with good numbers of chaffinches and meadow pipits present. Up to three marsh harriers are regularly present and migrant birds such as swallows and winter thrushes will no doubt be recorded at the right time of year.  The new transect compliments the Sorel transects 1 and 2 December 2012. Mapping by Tim Wrightexisting Sorel to Mourier Valley transect that runs along the cliff path.

The project’s monitoring guidelines are available for download here

Study follows marsh harrier migration

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Wing tagged marsh harrier. Photo by Andy ThompsonNews update from the Hawk and Owl Trust

Five young marsh harriers hatched on Sculthorpe Moor Reserve in Norfolk, UK have had wing tags fitted as part of a long-term study to see where the species travels to once the young birds leave the area where they were hatched.

This year’s birds join a total of 27 young marsh harriers hatched from other Norfolk sites in the same season and 14 from the 2011 generation, making a total to date of 46 birds carrying distinctive lime green wing tags.

Hawk and Owl Trust marsh harrier tag. www.hawkandowl.orgTags are visible to the naked eye from a distance, and the individual codes can be read with binoculars or telescopes.

Older birds can be distinguished from this year’s because the 2011 harriers’ tags carried white letters and numbers, while the 2012 birds have black codes.

The fitting of the wing tags is done by bird ringers, who have a wealth of experience and knowledge in handling birds of all species. It is a painless experience for the birds. Data is being analysed by students at Leicester University, but little is known about the birds’ movements once they leave the nest, where they go in winter and where they return to nest in the spring. Marsh harriers are migratory and are expected to fly south. However, in recent years many marsh harriers have been stayed within the UK and Channel Islands.

This study will allow the scientists to understand the following questions:

1. Where do these birds go once they are independent of their parents? Are they a long distant migrant, travelling into Europe and beyond, or do they stay in the local area for the winter?
2. Once mature, do they return to the area where they were hatched, or do they breed at completely different sites?
3. Once they start to breed, do they breed in their traditional reed bed habitat or in other crops?”

None of Jersey’s marsh harriers have been given wing tags but several have been given numbered metal leg rings in common with other bird species ringed locally and elsewhere.

Please report any sightings of wing-tagged harriers if they come to Jersey or pass through the Island. Sightings should be reported to the Hawk and Owl Trust here but please also let the Société Jersiaise Ornithology Section know too. All records are valuable even if details of the wing codes are not clear to the observer. Look out too for any birds with coloured plastic leg rings that might be obvious – these might be birds from other study programmes.

 

Wild bird populations in UK, 1970-2011

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Press release from UK’s Department of Environment, Food and Rural Affairs (Defra)

Bird populations have long been considered by scientists to provide a good indication of the broad state of wildlife because birds occupy a wide range of habitats, they tend to be near or at the top of food chains and there are considerable long-term data on changes in bird populations from a range of national surveys and monitoring schemes coordinated by expert organisations. Birds also have huge cultural importance and are viewed as a highly valued part of the UK’s natural environment by the general public.

Defra 2012. www.defra.gov.ukThe latest annual statistics present trends up to 2011 in wild bird populations in the UK and highlight that:

  • When viewed together, the status of common native breeding bird species in UK appear to have changed      little compared with 40 years ago. However, there has been considerable variation between individual bird species and groups of species that share the same broad habitats, and there have been some large losses in once abundant species, particularly house sparrow and starling. The all-species index showed a small but significant decline of 2% from 2005 to 2010;
  • Common starling. Photo by Mick DrydenAlthough the largest decreases in farmland bird populations occurred between the late seventies and the early nineties, there has been a pronounced recent decline of 13% since 2003. Historically, the decrease has been driven mainly by species that are restricted to, or highly dependent, on farmland habitats (the ‘specialists’). However, there has also been a decline in species that are associated with a wider range of habitats (the ‘generalists’) following a peak in 2003;
  • There has been little recent change in UK woodland bird populations, with the greatest decline occurring from the late eighties until the mid nineties. In the late    nineties, populations of generalist species started to increase but the populations of specialist species continued to decline;
  • In 2011 breeding water and wetland bird populations in the UK were at around the same level as they were in 1975, although there has been a decline of 14%since 2000;
  • Seabird populations in the UK have fallen by 12% since a peak in 1999; however, they remain 27% higher than when data collection began in 1970;
  • In the winter of 2010-11 populations of wintering waterbirds in the UK were 93% higher than in the winter of 1975-6, although there has been a 7% decline in numbers since their peak in 1996-7.

The bird population indices have been compiled in conjunction with the Royal Society for the Protection of Birds (RSPB), the British Trust for Ornithology (BTO) and the Joint Nature Conservation Committee (JNCC).

Dowload full report here