Bardsey's Wildlife

Friday, 17 May 2013

A fantastic bird-filled day saw hundreds of common migrants once again passing through the island, as well as a few scarcities thrown into the mix.
By far the highlight of the day was a Honey Buzzard which was seen very briefly above the mountain in the afternoon. This species is surprisingly rare on Bardsey, and the last record was over eight years ago.
The second Hen Harrier of the year also glided over the mountain midday, along with a single Buzzard. A Blue-headed Wagtail was seen briefly on the West Side in the afternoon, where it was joined by a female flavissima moments later.

A nice selection of other notable species included a Common Redstart, two Black Redstarts, three Whinchats, a Cuckoo, four Reed Warblers and a Lesser Whitethroat.

The numbers of common migrants was an incredible sight, and was certainly experienced at Cristin during the morning’s mist netting. In total, 236 birds were ringed during the day, an incredible 150 of which were Sedge Warblers!
A grand total of 309 Sedge Warblers were seen during the day, whilst final figures for other common warblers amounted to 191 Common Whitethroats, six Garden Warblers, 88 Blackcaps, 47 Willow Warblers and 39 Chiffchaffs. A superb 55 Spotted Flycatchers were recorded all over the island, including along the rocky coastline, and a single Pied Flycatcher was amongst the birds at the obs in the afternoon.

Hirundine movement was sustained all day long, with eight Sand Martins, 421 Swallows and 156 House Martin srecorded, along with 14 Swifts. Finch movement was also in evidence, with nine Siskins, 22 Goldfinches and 71 Lesser Redpolls recorded.

What a day!!!

The second Blue-headed Wagtail of the year was seen on the west side

Over 200 Sedge Warblers were seen during the day, and over 150 of these were ringed!

Spotted Flycatchers featured well, with 55 recorded

Male Whinchat

Common Whitethroats were also seen almost everywhere, with over 190 seen

Swift

House Martin

Poor shot of the Hen Harrier

Hooded Crow

Honey Buzzard

Chiffchaff

Spotted Flycatcher

And some pictures of today's ringing activities:

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An incredible 150 Sedge Warblers were ringed during the day, which is over half of the expected annual ringing total for this species (c) Steve Stansfield
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In the early morning, just under 120 birds were caught in two net rounds! (c) Steve Stansfield
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Reed Warbler (c) Steve Stansfield
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An educational image showing the contrast between a female first summer Blackcap (right) and an adult female (left) (c) Steve Stansfield

2 comments:

Douglas Mcfarlane17 May 2013 at 19:56
Stunning images Ben (especially those spotted flycathcers), I'm just trying to get my head around those numbers of Sedge Warblers, incredible.
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Ben Porter18 May 2013 at 19:51
Thanks Doug- the number of Sedge Warblers is pretty ridiculous!
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Click to see inside!

Edited by Mike Archer, Mark Grantham, Peter Howlett and Steve Stansfield and published by T & AD Poyser, this fabulous book describes how much has changed since the first edition of Bird Observatories in Britain and Ireland was published in 1976. There are detailed accounts of the history and work carried out at each of the 18 observatories, with personal accounts by wardens and staff of the excitement of discovering a rarity, watching thousands of migrants attracted to a lighthouse after dark, and the pleasure and experiences that working at some of the country’s most remote and beautiful locations can bring. Click the picture of the book to see inside or to buy your copy.

Migrants

Being sited on the main migration route of many species, Bardsey (or Ynys Enlli in Welsh) is a well-known site for migrant birds, turning up many scarcities and rarities, as well as large numbers of common migrants. The island’s list now stands on 326, after the recent addition of Citrine Wagtail in October 2012.

Although Bardsey’s reputation for rare birds may not quite match that of some observatories, it is almost certainly the best site in Wales for rarities. Among Bardsey’s rarer visitors are the first Summer Tanager (1957) and Yellow Warbler (1964) to have been recorded in Britain and Ireland, as well as American vagrants such American Bittern, Sora, Kildeer, Spotted Sandpiper, Grey-cheeked Thrush, American Robin, Song Sparrow, Dark-eyed Junco, Red-eyed Vireo, Black-and-white Warbler, Common Yellowthroat, Rose-breasted Grosbeak and Blackpoll Warbler. To add to this impressive list of rarities, Black-winged Stilt, Lesser Yellowlegs, Lanceolated Warbler, River Warbler, Western Orphean Warbler, Booted Warbler, Blyth’s Reed Warbler, Eyebrowed Thrush, Thrush Nightingale, Red-flanked Bluetail, Isabelline Wheatear, Black-eared Wheatear, Collared Flycatcher, Blyth’s Pipit, Pine Bunting, Rock Bunting, Yellow-breasted Bunting and White-throated Sparrow have all been recorded.

Besides the rarities, Bardsey regularly attracts large numbers of weary migrants during 'fall' conditions in Spring and Autumn, largely a consequence of the fully operational Bardsey Lighthouse. In 2011, for example, a single grounding of migrants resulted in over 1000 Willow Warblers making groundfall on the island in August. In the not-so-distant past, a single attraction of 40,000 Redwings occurred in late October at the end of the last century.

Breeding birds

Bardsey is home to some 26, 000 pairs of Manx Shearwaters, which can be heard on dark nights from mid-March to August. They breed in their excavated burrows, which are scattered all over the island. Chough is the most important species of conservation concern, with between four to eight pairs nesting around the coastal cliffs most years, and a wintering flock of up to 50 individuals. A pair of Peregrines breed on the island, and a 1-2 pair of Ravens also nest most years. There are several species which nest only occasionally, such as Sparrowhawk and Little Owl, along with Afro-Palearctic migrants like Sedge Warbler, Blackcap, Chiffchaff and Willow Warbler. Up to ten pairs of Stonechats can nest in the isolated gorse patches around the island, along with many Linnets and Meadow Pipits. Corncrakes were once a common breeder on the island, although since 1970 there have been no confirmed pairs nesting. In recent years the likes of Lapwing, Yellowhammer, House Sparrow and Starling have also all become extinct as breeding species. In contrast, Shelduck, Puffin, Long-eared Owl, Grasshopper Warbler and Goldcrest have been added to the breeding bird list since 1998.

Ringing

Ringing is a very important part of the observatory’s role on the island. Since 1953, the observatory has ringed over 315,00 birds of 198 species. The highest number ringed in a single year was 1988, with a total of 11, 301 birds ringed of 93 species. There have been many days in the observatory’s history when several hundred birds have been ringed in one day; these occasions have mostly involved breeding seabirds, although these numbers can also easily occur with migrant species.

Lepidoptera

A total of 561 species of moths have been recorded on the island. Bardsey is not an overly good location for scarce moths, although the existence of Thrift Clearwings (Nationally scarce) has been established on the Thrift plants around the coast in recent years, after first being recorded in the years 1980 and 1996. Migrant moths arrive in small numbers every year, for example the annual arrival of Hummingbird Hawkmoths in the autumn; rarer immigrants in the past have included Death’s Head Hawkmoths, Vestals, Crimson Speckled and Red-necked Footman.

In recent years, a greater emphasis has been placed on recording and identifying the so-called ‘micro-moths’, which has resulted in the finding of 41 new species for Bardsey since 2011. In 2012, the coastal subspecies of Eana penziana (E.p.colquhounana) was re-found on the island, which was the first time that this Nationally Scarce species had been recorded on Bardsey since 1966. Apotomis semifasciana is also amongst the scarcer species of micro-moths to inhibit the island (also Nationally Scarce).

Butterflies are present on the island in small numbers, with species such as Common Blue, Small Copper and Small Tortoise-shell being the most common. A scarcer breeding species is the Grayling, which can be found in small numbers on the top of the mountain. Migrant butterflies such as Painted Lady can arrive in their hundreds, although other migrants such as Clouded Yellow and Dark-green Fritillary are quite rare.

Bardsey's Wildlife

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Friday, 17 May 2013

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