Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England
Little is known about the diet of harbor porpoises (Phocoena phocoena) in southern New England Where bycatch Was a highly contentious issue since the late 1990s until recently. To fill this data gap, stomach contents Were examined from 46 harbor porpoises taken as bycatch over 24 years (1994–2017) b...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1873 2023-10-09T21:55:17+02:00 Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England Orphanides, Christopher D. wenzel, Frederick W. Collie, Jeremy S. 2020-01-01T08:00:00Z https://digitalcommons.uri.edu/gsofacpubs/904 https://doi.org/10.7755/FB.118.2.7 unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/904 doi:10.7755/FB.118.2.7 https://doi.org/10.7755/FB.118.2.7 Graduate School of Oceanography Faculty Publications text 2020 ftunivrhodeislan https://doi.org/10.7755/FB.118.2.7 2023-09-11T18:07:44Z Little is known about the diet of harbor porpoises (Phocoena phocoena) in southern New England Where bycatch Was a highly contentious issue since the late 1990s until recently. To fill this data gap, stomach contents Were examined from 46 harbor porpoises taken as bycatch over 24 years (1994–2017) between January and May. Prey species Were identified to the lowest possible taxon through hard part analysis, primarily of otoliths and squid beaks. Size and species of harbor porpoise prey overlapped little With those of gillnet catch. Average prey size Was larger for adult harbor porpoises (≥140 cm total length), females, and those taken during the first half of our study (1994–2006) than for smaller porpoises, males, and those caught during the second half (2007–2017). Average total biomass consumed per stomach Was 2.3 kg, an estimate that represents approximately 12–24 h of feeding. Clupeids, true hakes (Urophycis spp.), squids (Decapodiformes), and silver hake (Merluccius bilinearis) constituted 85.5% of all estimated biomass. Cusk-eels (Ophidiidae) and small flatfish species (Pleuronectiformes) Were frequently consumed (found in 29.8% and 27.7% of all stomach samples), but each taxon made up less than 1% of estimated biomass because of their small size. These results could help advance ecosystem-based management by better defining the diet of harbor porpoises in the context of potential climate changes. Text Phocoena phocoena University of Rhode Island: DigitalCommons@URI Hake ENVELOPE(15.612,15.612,66.797,66.797) Fishery Bulletin 118 2 184 197 |
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Open Polar |
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University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
description |
Little is known about the diet of harbor porpoises (Phocoena phocoena) in southern New England Where bycatch Was a highly contentious issue since the late 1990s until recently. To fill this data gap, stomach contents Were examined from 46 harbor porpoises taken as bycatch over 24 years (1994–2017) between January and May. Prey species Were identified to the lowest possible taxon through hard part analysis, primarily of otoliths and squid beaks. Size and species of harbor porpoise prey overlapped little With those of gillnet catch. Average prey size Was larger for adult harbor porpoises (≥140 cm total length), females, and those taken during the first half of our study (1994–2006) than for smaller porpoises, males, and those caught during the second half (2007–2017). Average total biomass consumed per stomach Was 2.3 kg, an estimate that represents approximately 12–24 h of feeding. Clupeids, true hakes (Urophycis spp.), squids (Decapodiformes), and silver hake (Merluccius bilinearis) constituted 85.5% of all estimated biomass. Cusk-eels (Ophidiidae) and small flatfish species (Pleuronectiformes) Were frequently consumed (found in 29.8% and 27.7% of all stomach samples), but each taxon made up less than 1% of estimated biomass because of their small size. These results could help advance ecosystem-based management by better defining the diet of harbor porpoises in the context of potential climate changes. |
format |
Text |
author |
Orphanides, Christopher D. wenzel, Frederick W. Collie, Jeremy S. |
spellingShingle |
Orphanides, Christopher D. wenzel, Frederick W. Collie, Jeremy S. Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England |
author_facet |
Orphanides, Christopher D. wenzel, Frederick W. Collie, Jeremy S. |
author_sort |
Orphanides, Christopher D. |
title |
Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England |
title_short |
Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England |
title_full |
Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England |
title_fullStr |
Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England |
title_full_unstemmed |
Diet of harbor porpoises (Phocoena phocoena) on the continental shelf off southern New England |
title_sort |
diet of harbor porpoises (phocoena phocoena) on the continental shelf off southern new england |
publisher |
DigitalCommons@URI |
publishDate |
2020 |
url |
https://digitalcommons.uri.edu/gsofacpubs/904 https://doi.org/10.7755/FB.118.2.7 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Hake |
geographic_facet |
Hake |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/904 doi:10.7755/FB.118.2.7 https://doi.org/10.7755/FB.118.2.7 |
op_doi |
https://doi.org/10.7755/FB.118.2.7 |
container_title |
Fishery Bulletin |
container_volume |
118 |
container_issue |
2 |
container_start_page |
184 |
op_container_end_page |
197 |
_version_ |
1779319143384743936 |