Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models
Over-exploitation of top predators and fish stocks has altered ecosystems towards less productive systems with fewer trophic levels. In the Celtic Sea (CS), discards and bycatch levels have prompted concern about some fisheries, while fin and humpback whales are recovering from centuries of over-exp...
Published in: | Marine Mammal Science |
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ftsouthampton:oai:eprints.soton.ac.uk:361852 2023-07-30T04:02:31+02:00 Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models Ryan, Conor Berrow, Simon D. McHugh, Brendan O'Donnell, Ciarán Trueman, Clive N. O'Connor, Ian 2014-01 https://eprints.soton.ac.uk/361852/ English eng Ryan, Conor, Berrow, Simon D., McHugh, Brendan, O'Donnell, Ciarán, Trueman, Clive N. and O'Connor, Ian (2014) Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models. Marine Mammal Science, 30 (1), 242-258. (doi:10.1111/mms.12034 <http://dx.doi.org/10.1111/mms.12034>). Article PeerReviewed 2014 ftsouthampton https://doi.org/10.1111/mms.12034 2023-07-09T21:51:20Z Over-exploitation of top predators and fish stocks has altered ecosystems towards less productive systems with fewer trophic levels. In the Celtic Sea (CS), discards and bycatch levels have prompted concern about some fisheries, while fin and humpback whales are recovering from centuries of over-exploitation. A lack of empirical evidence on the preferred diet of some predators such as whales in the CS has hindered the implementation of effective conservation measures using an ecosystem-based approach to fisheries management. Using a Bayesian framework (SIAR), stable carbon (?13C) and nitrogen (?15N) isotope mixing models were used to assign proportionate diet solutions to fin and humpback whales (skin biopsies) and putative prey items: herring (Clupea harengus), sprat (Sprattus sprattus), and krill (Meganyctiphanes norvegica and Nyctiphanes couchii) in the CS. Krill was the single most important prey item in the diet of fin whales, but one of the least important for humpback whales (albeit based on a small sample of humpback whale samples). Age 0 sprat and herring comprised a large proportion of the diet of both species, followed by older sprat (age 1–2) and older herring (age 2–4). An ecosystem based approach to fisheries management will be required in the CS if we seek effective conservation of both fin and humpback whales, and sustainable fisheries. Article in Journal/Newspaper Balaenoptera physalus Humpback Whale Meganyctiphanes norvegica Megaptera novaeangliae University of Southampton: e-Prints Soton Marine Mammal Science 30 1 242 258 |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
Over-exploitation of top predators and fish stocks has altered ecosystems towards less productive systems with fewer trophic levels. In the Celtic Sea (CS), discards and bycatch levels have prompted concern about some fisheries, while fin and humpback whales are recovering from centuries of over-exploitation. A lack of empirical evidence on the preferred diet of some predators such as whales in the CS has hindered the implementation of effective conservation measures using an ecosystem-based approach to fisheries management. Using a Bayesian framework (SIAR), stable carbon (?13C) and nitrogen (?15N) isotope mixing models were used to assign proportionate diet solutions to fin and humpback whales (skin biopsies) and putative prey items: herring (Clupea harengus), sprat (Sprattus sprattus), and krill (Meganyctiphanes norvegica and Nyctiphanes couchii) in the CS. Krill was the single most important prey item in the diet of fin whales, but one of the least important for humpback whales (albeit based on a small sample of humpback whale samples). Age 0 sprat and herring comprised a large proportion of the diet of both species, followed by older sprat (age 1–2) and older herring (age 2–4). An ecosystem based approach to fisheries management will be required in the CS if we seek effective conservation of both fin and humpback whales, and sustainable fisheries. |
format |
Article in Journal/Newspaper |
author |
Ryan, Conor Berrow, Simon D. McHugh, Brendan O'Donnell, Ciarán Trueman, Clive N. O'Connor, Ian |
spellingShingle |
Ryan, Conor Berrow, Simon D. McHugh, Brendan O'Donnell, Ciarán Trueman, Clive N. O'Connor, Ian Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models |
author_facet |
Ryan, Conor Berrow, Simon D. McHugh, Brendan O'Donnell, Ciarán Trueman, Clive N. O'Connor, Ian |
author_sort |
Ryan, Conor |
title |
Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models |
title_short |
Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models |
title_full |
Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models |
title_fullStr |
Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models |
title_full_unstemmed |
Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models |
title_sort |
prey preferences of sympatric fin (balaenoptera physalus) and humpback (megaptera novaeangliae) whales revealed by stable isotope mixing models |
publishDate |
2014 |
url |
https://eprints.soton.ac.uk/361852/ |
genre |
Balaenoptera physalus Humpback Whale Meganyctiphanes norvegica Megaptera novaeangliae |
genre_facet |
Balaenoptera physalus Humpback Whale Meganyctiphanes norvegica Megaptera novaeangliae |
op_relation |
Ryan, Conor, Berrow, Simon D., McHugh, Brendan, O'Donnell, Ciarán, Trueman, Clive N. and O'Connor, Ian (2014) Prey preferences of sympatric fin (Balaenoptera physalus) and humpback (Megaptera novaeangliae) whales revealed by stable isotope mixing models. Marine Mammal Science, 30 (1), 242-258. (doi:10.1111/mms.12034 <http://dx.doi.org/10.1111/mms.12034>). |
op_doi |
https://doi.org/10.1111/mms.12034 |
container_title |
Marine Mammal Science |
container_volume |
30 |
container_issue |
1 |
container_start_page |
242 |
op_container_end_page |
258 |
_version_ |
1772813336121966592 |