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Determination of foraging áreas and migratory routes of Ardenna creatopus to assess risks of incidental bycatch in fisheries

Released: 2015
Citation:
Hodum, P, R Carle, J Adams, V Lopez, V Colodro, J Felis. 2015. Determination of foraging áreas and migratory routes of Ardenna creatopus to assess risks of incidental bycatch in fisheries. The XTH Neotropical Ornithological Congress (NOC) Meeting, Manaus, Brazil, July 2015. [presentation]

The Pink-footed Shearwater, Ardenna creatopus, is a pelagic seabird that is listed as in danger of extinction by Chile, with an estimated global population of ~60,000 individuals. It is thought that incidental bycatch of this species in fisheries could be an important cause in population decline (i.e. annual estimated mortality of >1000 adults).

This species breeds only in Chile on the Juan Fernandez Archipelago (JFI; 30% of global population), and Isla Mocha (70% of global population). Using GPS and satellite transmitters, we determined foraging areas during the breeding period and migratory routes of individuals from JFI and Isla Mocha during 6 years between 2002-2015.

During the breeding period, foraging areas were associated with the continental shelf of Chile between 31.5 and 40.0 degrees south, and birds remained in Chile territorial waters 100% of the time. This region contains major sardine and anchovy fisheries, Pink-footed Shearwaters’ principal prey. Overlap of foraging areas and these fisheries may represent an important threat of bycatch.

During migration, birds traveled up to 8,616 kilometers. There were two principal wintering zones; one off the coast of Peru (in the principal fishing area of the southern Pacific), and the other off of Southern California, USA. During the migratory period, birds spent 82% of the time outside of the territorial waters of Chile.

These results highlight the importance of working across countries where Pink-footed Shearwaters migrate to assess bycatch risks and implement conservation solutions.

 



This product is associated with the following project:
Summary of Seabird Studies at WERC

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