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Guide to Marine Mammals and Turtles of the U.S. Pacific

Field guide to marine mammals and sea turtles of Hawaii, California, Oregon, Washington Learn more...

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This is part of Seabird Bycatch: Trends, Roadblocks, and Solutions

Description

Experts in seabird ecology, fisheries management, and population modeling participated in a three-day workshop (October 8-10, 1998) at the Western Pacific Regional Fishery Management Council (WPRFMC) offices in Honolulu to investigate the population dynamics of the Black-footed Albatross (Phoebastria nigripes). The workshop’s primary goal was to characterize the population biology of the Black-footed Albatross and evaluate its resilience to the effects of mortality due to longline fishery interactions. Worldwide there are 61,866 and 558,415 breeding pairs of Blackfooted and Laysan (P. immutabilis) Albatrosses, respectively, and both species are caught in approximately equal numbers during longline fishing. This suggests that the Black footed Albatross population may be more seriously affected. The Black-footed Albatross population suffers different combinations of both anthropogenic and natural mortalities, in common with many seabird populations. Thus, a series of simulations were conducted to investigate how population removals added onto baseline mortality would affect the sustainable population growth rates. Also, analyses generated from the bird-banding data sets found that juvenile Blackfooted Albatrosses were caught on longline more frequently than adults. Simulated experiments also investigated how differences in juvenile and adult removals would affect the Black-footed Albatross population dynamics. The findings showed that over the long term, a chronic mortality such as longline fishing resulted in slow decline of species population size irrespective of uncertainties associated with the estimated parameters. Workshop participants generated seven recommendations for consideration by the WPRFMC, including the improvement and standardization of data collection and the completion of analyses as studies progress.

Item details

• Item number: AK-SG-01-01f
• Year: 2001
• DOI: https://doi.org/10.4027/sbtrs.2001.06

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