Fisheries Exploitation by Albatross Quantified With Lipid Analysis
Mortality from incidental bycatch in longline fishery operations is a global threat to seabird populations, and especially so for the albatross family (Diomedeidae) in which 15 out of 22 species are threatened with extinction. Despite the risks, fisheries remain attractive to many species of seabird...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2018-04-01
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| Series: | Frontiers in Marine Science |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/article/10.3389/fmars.2018.00113/full |
| _version_ | 1818379635994394624 |
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| author | Melinda G. Conners Melinda G. Conners Chandra Goetsch Suzanne M. Budge William A. Walker Yoko Mitani Daniel P. Costa Scott A. Shaffer Scott A. Shaffer |
| author_facet | Melinda G. Conners Melinda G. Conners Chandra Goetsch Suzanne M. Budge William A. Walker Yoko Mitani Daniel P. Costa Scott A. Shaffer Scott A. Shaffer |
| author_sort | Melinda G. Conners |
| collection | DOAJ |
| description | Mortality from incidental bycatch in longline fishery operations is a global threat to seabird populations, and especially so for the albatross family (Diomedeidae) in which 15 out of 22 species are threatened with extinction. Despite the risks, fisheries remain attractive to many species of seabird by providing access to high-energy foods in the form of discarded fish and offal, target fish, and baited hooks. Current policy regarding fisheries management is increasingly aimed at discard reform, exemplified by a discard ban initiated in the European Union Common Fisheries Policy in 2014. While there is global agreement on the importance of minimizing the waste inherent in bycatch and discards, there is also growing concern that there is a need to understand the extent to which marine animals rely on fisheries-associated resources, especially at the colony and individual levels. We used a novel adaptation of quantitative fatty acid signature analysis (QFASA) to quantify fisheries-associated prey in the diet of two threatened North Pacific albatross species. Diet was estimated with QFASA using multiple lipid classes from stomach oil collected from incubating and chick-brooding Laysan and black-footed albatrosses across three breeding seasons. Prey-specific error was estimated by comparing QFASA estimated diets from known “simulated” diets, which informed the level of precaution appropriate when interpreting model results. Fisheries-associated diet occurred in both albatross species across both the incubation and chick-brood stages; however, neither species relied on fisheries food as the dominant food source (consisting of <10% of the total pooled proportional diet in each species). While total diet proportion was low, the incidence of fisheries-associated resources in albatross diets was highest in the 2009–2010 breeding season when there was a strong central Pacific El Niño. Additionally, the diets of a few individuals consisted almost entirely of fisheries-associated food, indicating that some birds might specialize on this foraging tactic. QFASA proved a tractable method for estimating the importance of fisheries-associated resources in albatross diet, and, as a tool, has the potential to enable long-term monitoring of diet and fisheries reliance of breeding colonies in the northwestern Hawaiian Islands. |
| first_indexed | 2024-12-14T02:05:56Z |
| format | Article |
| id | doaj.art-3da8c9864dd54c269c0bd053a86c784a |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-14T02:05:56Z |
| publishDate | 2018-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-3da8c9864dd54c269c0bd053a86c784a2022-12-21T23:20:53ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452018-04-01510.3389/fmars.2018.00113329603Fisheries Exploitation by Albatross Quantified With Lipid AnalysisMelinda G. Conners0Melinda G. Conners1Chandra Goetsch2Suzanne M. Budge3William A. Walker4Yoko Mitani5Daniel P. Costa6Scott A. Shaffer7Scott A. Shaffer8Center for the Science of Animal Care and Welfare, Chicago Zoological Society, Brookfield, IL, United StatesDepartment of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, CA, United StatesDepartment of Ecology & Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, CA, United StatesDepartment of Process Engineering and Applied Science, Dalhousie University, Halifax, NS, CanadaMarine Mammal Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic Atmospheric Administration, Seattle, WA, United StatesField Science Center for Northern Biosphere, Hokkaido University, Hakodate, JapanDepartment of Ecology & Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, CA, United StatesDepartment of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, CA, United StatesDepartment of Biological Sciences, San Jose State University, San Jose, CA, United StatesMortality from incidental bycatch in longline fishery operations is a global threat to seabird populations, and especially so for the albatross family (Diomedeidae) in which 15 out of 22 species are threatened with extinction. Despite the risks, fisheries remain attractive to many species of seabird by providing access to high-energy foods in the form of discarded fish and offal, target fish, and baited hooks. Current policy regarding fisheries management is increasingly aimed at discard reform, exemplified by a discard ban initiated in the European Union Common Fisheries Policy in 2014. While there is global agreement on the importance of minimizing the waste inherent in bycatch and discards, there is also growing concern that there is a need to understand the extent to which marine animals rely on fisheries-associated resources, especially at the colony and individual levels. We used a novel adaptation of quantitative fatty acid signature analysis (QFASA) to quantify fisheries-associated prey in the diet of two threatened North Pacific albatross species. Diet was estimated with QFASA using multiple lipid classes from stomach oil collected from incubating and chick-brooding Laysan and black-footed albatrosses across three breeding seasons. Prey-specific error was estimated by comparing QFASA estimated diets from known “simulated” diets, which informed the level of precaution appropriate when interpreting model results. Fisheries-associated diet occurred in both albatross species across both the incubation and chick-brood stages; however, neither species relied on fisheries food as the dominant food source (consisting of <10% of the total pooled proportional diet in each species). While total diet proportion was low, the incidence of fisheries-associated resources in albatross diets was highest in the 2009–2010 breeding season when there was a strong central Pacific El Niño. Additionally, the diets of a few individuals consisted almost entirely of fisheries-associated food, indicating that some birds might specialize on this foraging tactic. QFASA proved a tractable method for estimating the importance of fisheries-associated resources in albatross diet, and, as a tool, has the potential to enable long-term monitoring of diet and fisheries reliance of breeding colonies in the northwestern Hawaiian Islands.http://journal.frontiersin.org/article/10.3389/fmars.2018.00113/fullbiochemical diet analysisQFASAfisheries resource managementPhoebastriaProcelleriformesseabird-fishery interaction |
| spellingShingle | Melinda G. Conners Melinda G. Conners Chandra Goetsch Suzanne M. Budge William A. Walker Yoko Mitani Daniel P. Costa Scott A. Shaffer Scott A. Shaffer Fisheries Exploitation by Albatross Quantified With Lipid Analysis Frontiers in Marine Science biochemical diet analysis QFASA fisheries resource management Phoebastria Procelleriformes seabird-fishery interaction |
| title | Fisheries Exploitation by Albatross Quantified With Lipid Analysis |
| title_full | Fisheries Exploitation by Albatross Quantified With Lipid Analysis |
| title_fullStr | Fisheries Exploitation by Albatross Quantified With Lipid Analysis |
| title_full_unstemmed | Fisheries Exploitation by Albatross Quantified With Lipid Analysis |
| title_short | Fisheries Exploitation by Albatross Quantified With Lipid Analysis |
| title_sort | fisheries exploitation by albatross quantified with lipid analysis |
| topic | biochemical diet analysis QFASA fisheries resource management Phoebastria Procelleriformes seabird-fishery interaction |
| url | http://journal.frontiersin.org/article/10.3389/fmars.2018.00113/full |
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