By R.A. Mavor, Martin Parsons, Martin Heubeck, S. Schmitt
This annual document offers the tracking result of seabird populations and breeding functionality all through Britain and eire in 2003 and compares those findings with prior years. the purpose of this record is to attract awareness to extraordinary alterations in seabird numbers or breeding good fortune, that could advantage direct conservation motion or additional examine, and to supply necessary suggestions through putting effects for person colonies or areas in a much wider context. The document is produced in collaboration with the Royal Society for the security of Birds (RSPB) and the Shetland Oil Terminal Environmental Advisory workforce (SOTEAG).
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Extra resources for Seabird Numbers and Breeding Success in Britain and Ireland 2003 (UK Nature Conservation Series)
No previous productivity data are available for either colony. 3 Breeding success (chicks per pair) of mew gulls 2002-2003 and 1986-2002 at selected colonies mentioned in the text. Figures in parentheses under 2001 and 2002 are the number of nests from which the estimates of success are derived. ) No. 0% to 81 pairs, the lowest figure recorded here since 1998. Breeding success was also below the long-term average (Swann 2003b). Elsewhere in the region, numbers declined at Alness Point, to 30 pairs, and accidental human disturbance again ensured no young were raised for the third successive year (A.
Similarly, on Foula only about two thirds of the 2002 territories were occupied in 2003, but meaningful numbers were difficult to assess due to many adults visiting their territories only briefly (Furness 2003). Numbers of AOT at study sites on Noss and Fetlar remained at seven and nine, respectively, each around half their long term average. The only Shetland site not following the trend was Hermaness (Duffield 2003), where numbers increased from 7 AOT in 2002 to 10 in 2003, still the second lowest for 12 years.
2% to 31 AON, the lowest count there since 1993. On Eigg, a small increase was noted since 2002 although the population there has 44 Lesser black-backed gull Larus fuscus remained between 35-45 AON since 1998. A small number continues to nest at Nigg Oil Terminal (north Scotland) where six pairs were again present in 2003. In Shetland, no birds were found on territory on Hildasay in early July, a colony which formerly held 50+ pairs as recently as 1998 (Okill 2003b). Elsewhere in the region, a survey of roof-nesting gulls in Lerwick found one pair, the first occurrence of this habit in the region (Okill 2003c) and the small colony on Mousa increased from three pairs in 2002 to 10 pairs.