Bardsey's Wildlife

Tuesday 22 April 2014

The day got off to an excellent start at 0730, with the island’s 10^th ever Iceland Gull seen amongst a flock of large gulls over the South Tip; this first-winter bird remained around the southern end of the island for the rest of the morning. At around the same time, the year’s first Little Egret flew out of Henllwyn, flying along the South End, before having a brief haggle with the Iceland Gull! The Turtle Dove remained on the island, residing above Ty Pellaf for the majority of the day.

Low cloud cover and light drizzle overnight resulted in a small attraction occurring at the Lighthouse in the small hours- some 60 Manx Shearwaters and 40 passerines (Wheatears, Blackcaps and phylloscs) were recorded. By morning, a good number of warblers and other common migrants were passing through the island, with counts amounting to: one Tree Pipit, 66 Wheatears, three Grasshopper Warbler, one Lesser Whitethroat, one Whitethroat, 22 Blackcaps, 58 Willow Warblers and 27 Chiffchaffs. A minimum of 83 Swallows sped southward over the island, perhaps heading to Ireland (as opposed to the mainland), and these were joined by three Sand Martins and one House Martin.

In other news, singles of 'Northern' Ringed Plover and Whimbrel were trapped and ringed overnight. The latter of these was fitted with colour-coded Darvic rings, as part of our colour-ringing project on this species. Coincidently, one of last year's colour-ringed Whimbrels actually appeared on the island midday, which we had ringed on the 28th April 2013.

A few mist nets were opened throughout the day, with just over 30 birds finding their way into them. Some of the highlights are shown below...(all images (c) Steve Stansfield)

After the first Lesser Whitethroat arrived yesterday, this smart bird was trapped and ringed at the observatory mid-morning

We have had two 'proper'-looking Mealy Redpolls this year, although we continue to catch birds which just don't seem to fit either (as has been the story in the last few springs). Take the top bird here, for example: large white wing bars, and a generally frosty look were somewhat intermediate, and a wing measurement of 72mm places it well inside the range for Lesser Redpoll. Compare the top bird to a normal Lesser Redpoll (lower)

Some Northern-looking Willow Warblers were also trapped: being noticeable larger in the hand, and looking somewhat greyer, almost like acredula birds

Twenty Manx Shearwaters were collected (alive) from the compound around the lighthouse in the morning; each bird was fitted with a ring, before being released at dusk. Above: some of the island visitors watch on as Steve rings one of the Manx Shearwaters

Conditions were perfect for moth trapping last night: low cloud cover, very little wind, mild temperatures, and a waning moon...the result was a decent catch in the moth traps, with around 25 caught at nant. This included the year's first V-Pug and Marbled Coronet...

Marbled Coronet

V-Pug

Spruce Carpet

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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 22 April 2014

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