Bardsey's Wildlife

Sunday 6 July 2014

Apologies for the lack of updates for the last few weeks; I am now back on the island and updates should resume regularity in the ensuing days and weeks. Although a slight trickle of southward-bound migrants has been noted in the last few weeks, autumn migration is certainly not in full swing as yet.

The focus at the moment is upon the island's wealth of breeding birds: both passerines and non-passerines. Linnets, Meadow Pipits, Swallows and Wheatears are all over the island, 80% of which are fledglings from this year. It is proving to be a brilliant breeding season for a number of species, particularly Choughs, as outlined in Steffan's piece on the breeding birds last week.

Waders are usually the most obvious migrants at this time of year, which has certainly been evident in the last few days: one Ringed Plover, two Lapwing, a Dunlin, seven Curlews, five Redshanks and three Common Sandpipers have been noted. Two Swifts flew south over the mountain midday, although any hirundine passage is difficult to assess at the moment due to the abundance of breeding Swallows.

Several Pied Wagtail pairs have managed to fledge their second broods, whilst others are still feeding chicks in the nest. This particular individual fledged from Ty Pellaf two days ago

Having remained extremely elusive for the last three months, the pair of Little Owls above Ty Pellaf have become much more noticeable after the fledging of their chicks in the last week or two. There is at least one other pair of Little Owls on the island, and possibly even a second

Manx Shearwaters

Meadow Pipits are all over the island at the moment, with around 100 pairs recorded. Many are looking very worn and bleached after rearing two broods. Some continue to feed their fledged young, such as this bird with what appears to be the body of a Dark Arches

The amazing pattern of a Horse Flie's eye is probably not enough to stop most people from swatting them, but they are pretty awesome!

Lepidoptera

This year is proving to be a fantastic year for moths on Bardsey. New species for the island are turning up in the traps with surprising regularity, and many of them are common garden moths elsewhere in the UK. Elephant Hawkmoth, Bordered Straw, Buff Arches and Pammene aurana are the most recent additions to the island's list. Aside these, two Double Lines in the last two days is a very surprising record, considering there is just one previous record on Bardsey, and that this is quite a scarce moth (Nationally Scarce Nb).

Double Line

Six-spot Burnets have started emerging from their pupal cases, and some fresh adults can be seen flying about the trackside and meadows

A handful of Yellow Shells can be disturbed by day from the bracken on the mountain

The first few Drinker moths have started turning up in the light traps around the withies and lowlands.

After the multitude of Lackey caterpillars which were present in their tents in early May through to June, the first adult moths are finding their way into the moth traps

Garden Tiger

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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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Sunday 6 July 2014

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