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Incidental and intentional catch threatens Galápagos waved albatross |
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| Authors: | Jill A Awkerman Kathryn P Huyvaert Jeffrey Mangel |
| Institution: | a Department of Biology, Wake Forest University, Winston-Salem, NC 27109-7325, USA b Department of Biology, University of Missouri, St. Louis, MO 63121-4499, USA c Pro Delphinus, Octavio Bernal, 572-5, Lima 11, Peru d Department of Fish, Wildlife, and Conservation Biology, Colorado State University, Ft. Collins, CO 80512-1474, USA |
| Abstract: | As large, long-lived seabirds with delayed and slow reproduction, albatrosses have low intrinsic mortality rates and are especially vulnerable to extinction from extrinsic sources of mortality such as fishery bycatch. Leg-band recovery information for waved albatrosses revealed mortality from both incidental catch and intentional catch for human consumption. Annual adult survival in 1999-2005, estimated from capture-mark-recapture data, was lower than historical estimates. This recent increase in adult mortality probably contributed to recent and dramatic shrinkage of the breeding population; periodic matrix models confirm that population growth rate is most sensitive to changes in adult survival. Banding data and recovery information also suggest that capture by fisheries is male-biased, which should reduce fecundity in this species with obligate bi-parental care. This new documentation of bycatch, harvesting, and associated demographic consequences provides reason for serious concern about the persistence of the single breeding population of the waved albatross. |
| Keywords: | Albatross Bycatch Harvest Galá pagos Perú Fisheries Seabird Mark-resight Periodic matrix model ENSO |
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