Bardsey's Wildlife

Saturday, 7 June 2014

Sorry for the lack of updates over the past few days, Ben has been off the island doing his exams so he has not been updating the blog. That said however, there has been very little worth saying, with the exception of a Garden Warbler two days ago.

HOWEVER, upon Ben's return this morning, he struck big in his garden, when he heard a bird singing from deep cover. He radioed out the news of either a Marsh or Blyth's Reed Warbler!

I ran as fast as my little legs could carry me (good job no one saw this though!!)

Tantalisingly brief views in the wet grass suggested the bird was a Blyth's Reed but the bird had stopped singing. Ben obtained a couple of poor photos which showed the bird had a well marked face and were even suggestive of Paddyfield Warbler (which we had on this very date last year!) as it appeared to have a dark eyebrow in the shots.

However, the song of the bird was not right for Paddyfield and was very good for Blyth's Reed (Ben fortunately got a short video clip of the bird's singing, which we all agreed sounded good for Blyth's). This, coupled with the short looking and well bunched primaries and lack of white tips, was enough to eliminate Marsh Warbler. The lack of russet tones were enough for us the be happy it was not a Reed. After about two hours, in which it had not sang again, but gave fleeting (less that 1 second!!) views, usually just before or after it had flown, we were slightly frustrated... But the bird finally gave itself up, albeit at a range of 50m. It sat in the open for about ten seconds and I rattled off a few photographs of it (see below). I could see the bird clearly and see that the face was not a Paddyfield's, but the big supercillium in front of the eye, and large billed and small bodied appearance fitted Blyth's Reed perfectly, this along with the cold olive colouration of the upperparts was spot on - well done Ben!!

After this we set a net near the area it was skulking in and the bird was trapped. In-hand measurements were enough to absolutely confirm the bird was Bardsey's second Blyth's Reed Warbler.

Very distant views were enough to be able to say that the bird was definitely not a Paddyfield Warbler and showed many good features of Blyth's Reed.

The strong supra-loral splodge is a good feature of Blyth's Reed. The cold colour, short primaries and a wing length of 62mm all pointed to this being the 5th for Wales.

It was a rather scruffy individual and did not want to sit the have its picture taken!!

The Emarginations (indents in the tips on the outer web of the flight feathers) were present on primaries 3, 4 and Very slightly on 5. Reed Warbler normally shows Emarginations just on P3.

In this image the very short primary projection can be seen also the colour of the rump and mantle feathers lacking any warm tones associated with Reed Warbler.

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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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Saturday, 7 June 2014

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