Intracolony variability during periods of poor reproductive performance at a Glaucous-winged Gull colony

Article Abstract:

A field study was conducted to determine the intracolony variations in periods of low breeding in a Glaucous-winged Gull (Larus glaucescens) colony in southcoastal Alaska. Nest-sites of gulls were observed during 1979 and 1980, years of poor reproductive performance in the colony. Breeding success was found to be lower in areas where gulls nested only in 1980 than in areas where nesting also occurred in 1979. The study showed that variations in reproductive performance occurred between years, and were not associated with large clutch or brood size.

Bird breeding, Bird populations, Gulls

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Nesting phenology of Kittlitz's Murrelet

Article Abstract:

The final laying and earliest hatching of Kittlitz's Murrelet (Brachyramphus brevirostris) eggs in South-eastern Alaska occur before those in the Chukchi Sea start laying eggs. Phenological variations in reproduction range from 30 days in Southeastern Alaska to 11 days in the more northern regions. The freezing of the Chukchi Sea and areas close to the nesting site poses a barrier to the Kittlitz's Murrelets nesting in the north. The murrelets in the south also have a greater variety in elevation of nesting sites.

Environmental aspects, Natural history, Bird eggs, Bird nests, Nest building, Murrelets, Phenology, Chukchi Sea

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Effects of the Exxon Valdez oil spill surveys in Prince William Sound, Alaska

Article Abstract:

A survey on the Exxon Valley oil spill was conducted to compare its pre- and post-spill effects on birds. Furthermore, the changes in the overall abundance across bays between the pre-spill and post-spill and unoiled/lightly oiled, moderately/heavily oiled bays were evaluated. Results reveal that some birds showed no negative responses to oiling. However, the impact of this oil spill was evident during 1989 and significantly affected Pigeon Guillemots species.

Exxon Valdez Oil Spill Disaster, 1989, Oil spills, Prince William Sound, Water birds, Wildlife, Oil spills and wildlife

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