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- W862114908 abstract "Principally because of the paucity of prespill data on the Barren Islands murre population size and reproductive success, it is impossible to quantify any effect on the spill on these populations. Available prespill data (1976--1978) on the East Amatuli murre population size ranges from 19,000 to 61,000 birds. These data are not systematic, replicated counts but rather are estimates indicating a broad range within which the true attendance figure probably resided. The postspill attendance counts range from 31,041 to 37,128 (1990--1992). Comparisons between matched historical and 1990s photographs showed nearly identical attendance patterns, although there were significantly more murres in the 1990s photographs. Postspill attendance data from multiply censused areas suggest a recovery may have been taking place because of greater than expected annual increases (+25% from 1990 to 1991). Prespill data on reproductive activity of the murres nesting in the Barren Islands were collected from a single 5 x 5-m plot located in a dense, flat section of the East Amatuli Light Rock colony. Comparisons with similarly collected postspill data suggest that phenology, egg production, and chick production are extremely variable among years, although chicks were fledged in all years. Egg and chick production were highest in 1977 andmore » 1991 and lowest in 1992. 72 refs., 9 figs., 5 tabs.« less" @default.
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- W862114908 date "2009-03-05" @default.
- W862114908 modified "2023-10-01" @default.
- W862114908 title "Common Murre Abundance, Phenology, and Productivity on the Barren Islands, Alaska: The" @default.
- W862114908 doi "https://doi.org/10.1520/stp19882s" @default.
- W862114908 hasPublicationYear "2009" @default.
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