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Wando Mount Pleasant Library
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Otranto Road Library
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John L. Dart Library
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Prey-switching to fishery discards does not compensate for poor natural foraging conditions in breeding albatross.
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- Author(s): Kuepfer, Amanda; Votier, Stephen C; Sherley, Richard B; Ventura, Francesco; Matias, Rafael; Anderson, Orea; Brickle, Paul; Arkhipkin, Alexander; Catry, Paulo
- Source:
ICES Journal of Marine Science / Journal du Conseil; Nov2023, Vol. 80 Issue 9, p2414-2426, 13p- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: Fishery discards supplement food for many seabirds, but the impacts of declining discards are poorly understood. Discards may be beneficial for some populations but have negative impacts by increasing bycatch risk or because they are junk-food. The Falkland Islands support > 70% of global black-browed albatross Thalassarche melanophris populations, which feed on discards. However, the effect of discards on population demographics, and implications of fishery management changes, are unknown. We analysed stomach contents of black-browed albatross chicks across eight breeding seasons (2004–2020) from New Island, Falkland Islands, to assess variation in discard consumption and how this relates to foraging conditions and breeding success. Across years, 68%–98% of samples contained natural prey, whilst 23%–88% of samples contained fishery discards. Discard consumption was positively related to fishery catches of hoki Macruronus magellanicus and sea surface temperature anomalies SSTA (°C), and negatively related to breeding success. These results suggest a diet-switching behaviour for Falkland Islands albatrosses, whereby birds switch from preferred natural prey to suboptimal discards when environmental conditions, and hence natural feeding opportunities, are unfavourable. Crucially, this study highlights that fishery discards do not compensate for poor natural foraging conditions for breeding albatrosses in the long term. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of ICES Journal of Marine Science / Journal du Conseil is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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