Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important
Cephalopods are components of the diet of many predators worldwide. They are identified mainly using their chitinized upper and lower beaks, but because it has been assumed that the number of upper and lower beaks would be the same in predator diet samples, more effort has been put into creating key...
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ftnerc:oai:nora.nerc.ac.uk:15282 2023-05-15T16:00:56+02:00 Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important Xavier, Jose C. Phillips, Richard A. Cherel, Yves 2011 http://nora.nerc.ac.uk/id/eprint/15282/ http://icesjms.oxfordjournals.org/content/68/9/1857.short unknown Oxford Journals Xavier, Jose C. orcid:0000-0002-9621-6660 Phillips, Richard A.; Cherel, Yves. 2011 Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important. ICES Journal of Marine Sciences, 68 (9). 1857-1864. https://doi.org/10.1093/icesjms/fsr103 <https://doi.org/10.1093/icesjms/fsr103> Marine Sciences Biology and Microbiology Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1093/icesjms/fsr103 2023-02-04T19:29:48Z Cephalopods are components of the diet of many predators worldwide. They are identified mainly using their chitinized upper and lower beaks, but because it has been assumed that the number of upper and lower beaks would be the same in predator diet samples, more effort has been put into creating keys for the lower beaks, which are more easily identifiable from morphology. A test is made of whether the number of upper and lower beaks differs in diet samples collected from a major cephalopod predator, the wandering albatross (Diomedea exulans), potential biases in the estimation of predator diets are assessed, and upper:lower beak ratios in published studies of other seabirds, seals, whales, and fish from different parts of the world reviewed. The ratio of upper to lower beaks in diet samples from wandering albatrosses varied greatly in a single year (from 69.6% more lower beaks to 59% more upper beaks), and between years (from 0.5 to 32.1% more upper beaks), and biases were greater for certain cephalopod species, resulting in underestimation of their relative importance. Future studies need to consider using both upper and lower beaks to improve the assessment of the contribution of different cephalopods to predator diets. Article in Journal/Newspaper Diomedea exulans Wandering Albatross Natural Environment Research Council: NERC Open Research Archive ICES Journal of Marine Science 68 9 1857 1864 |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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topic |
Marine Sciences Biology and Microbiology |
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Marine Sciences Biology and Microbiology Xavier, Jose C. Phillips, Richard A. Cherel, Yves Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important |
topic_facet |
Marine Sciences Biology and Microbiology |
description |
Cephalopods are components of the diet of many predators worldwide. They are identified mainly using their chitinized upper and lower beaks, but because it has been assumed that the number of upper and lower beaks would be the same in predator diet samples, more effort has been put into creating keys for the lower beaks, which are more easily identifiable from morphology. A test is made of whether the number of upper and lower beaks differs in diet samples collected from a major cephalopod predator, the wandering albatross (Diomedea exulans), potential biases in the estimation of predator diets are assessed, and upper:lower beak ratios in published studies of other seabirds, seals, whales, and fish from different parts of the world reviewed. The ratio of upper to lower beaks in diet samples from wandering albatrosses varied greatly in a single year (from 69.6% more lower beaks to 59% more upper beaks), and between years (from 0.5 to 32.1% more upper beaks), and biases were greater for certain cephalopod species, resulting in underestimation of their relative importance. Future studies need to consider using both upper and lower beaks to improve the assessment of the contribution of different cephalopods to predator diets. |
format |
Article in Journal/Newspaper |
author |
Xavier, Jose C. Phillips, Richard A. Cherel, Yves |
author_facet |
Xavier, Jose C. Phillips, Richard A. Cherel, Yves |
author_sort |
Xavier, Jose C. |
title |
Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important |
title_short |
Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important |
title_full |
Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important |
title_fullStr |
Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important |
title_full_unstemmed |
Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important |
title_sort |
cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important |
publisher |
Oxford Journals |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/15282/ http://icesjms.oxfordjournals.org/content/68/9/1857.short |
genre |
Diomedea exulans Wandering Albatross |
genre_facet |
Diomedea exulans Wandering Albatross |
op_relation |
Xavier, Jose C. orcid:0000-0002-9621-6660 Phillips, Richard A.; Cherel, Yves. 2011 Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important. ICES Journal of Marine Sciences, 68 (9). 1857-1864. https://doi.org/10.1093/icesjms/fsr103 <https://doi.org/10.1093/icesjms/fsr103> |
op_doi |
https://doi.org/10.1093/icesjms/fsr103 |
container_title |
ICES Journal of Marine Science |
container_volume |
68 |
container_issue |
9 |
container_start_page |
1857 |
op_container_end_page |
1864 |
_version_ |
1766396939142692864 |