Bardsey's Wildlife

Tuesday 15 August 2017

Another blustery day saw scopes pointed out to sea for most of the daylight hours. However, rewards were rather less than yesterday. Kittiwakes numbered a season high of 1948, while Manx Shearwaters were down to just 1405, with 200 Gannets a good count. Variety came in the shape of 19 Fulmars, four Arctic Terns, three Common Terns, two Sandwich Terns and singles of Great Skua, Arctic Skua and Guillemot, the latter becoming more notable in August as Auks generally have become thin on the ground!

Manx Shearwater (Puffinus puffinus) - Elliot's Birding Diaries

A decent selection of waders featured as it's most notable member a single Black-tailed Godwit, found on the South End and relocating to Carreg yr Honwy. 51 Curlews and 37 Turnstones were the most numerous, with Oystercatchers down to a remarkably low 27. 17 Whimbrels was a pretty good count for Bardsey in the autumn, with the best of the rest being 11 Dunlins, six Ringed Plovers, five Redshanks, four Purple Sandpipers, three Snipes (flushed from a wet patch on the South End), and two Common Sandpipers.

Rock Pipit (Anthus petrosus), trapped and ringed in the Heligoland trap as part of the island

colour ringing project (Image - Ben Porter)

BBFO Staff out with NGBs Jacob Spinks, Kate Fox, Luke Ozsanlav-Harris & Eleanor Grove showing them the island portable Heligoland Trap used for trapping and studying the Rock Pipits & Waders (Image - Ben Porter)

A Great Spotted Woodpecker trapped at the Plantation was the highlight on the land, with the commonest migrant again being Linnet, numbers were again on 117. 12 Willow Warblers were mostly at the Plantation, with three Sedge Warblers and a Blackcap the only other warblers noted. Three Goldcrests and three White Wagtails were also on the deck, while overhead were 78 Swallows, 38 House Martins and a single Tree Pipit heading south. Singles of Kestrel and Sparrowhawk, the latter an immature female, were also new in.

NGBs out ringing Manx Shearwater chicks as part of the BBFO census work (Image - Steve Stainfield)

A quiet day for migrant insects did see two Migrant Hawkers and singles of Painted Lady and Silver Y encouraged by a slight improvement in the weather. One Speckled Wood at the Plantation was the most notable of the resident Lepidoptera to be seen.

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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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Tuesday 15 August 2017

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