Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas
Southern Ocean humpback whales Megaptera novaeangliae are capital breeders, breeding in the warm tropics/subtropics in the winter and migrating to nutrient-rich Antarctic feeding grounds in the summer. The classic feeding model is for the species to fast while migrating and breeding, surviving on bl...
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Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Inter-Research Science Center
2024
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Subjects: | |
Online Access: | http://urn.fi/URN:NBN:fi:jyu-202406074433 |
id |
ftjyvaeskylaenun:oai:jyx.jyu.fi:123456789/95672 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
JYX - Jyväskylä University Digital Archive |
op_collection_id |
ftjyvaeskylaenun |
language |
English |
topic |
feeding ecology δ15N δ13C amino acids MixSIAR isoscapes antarctica UNSDG14 Life Below Water ravintoketjut valaat levinneisyys ravinto meriensuojelu isotooppianalyysi antarktinen alue migraatio (biologia) aminohapot |
spellingShingle |
feeding ecology δ15N δ13C amino acids MixSIAR isoscapes antarctica UNSDG14 Life Below Water ravintoketjut valaat levinneisyys ravinto meriensuojelu isotooppianalyysi antarktinen alue migraatio (biologia) aminohapot Bury, Sarah J. Peters, Katharina J. Sabadel, Amandine J. M. St John Glew, Katie Trueman, Clive Wunder, M.B. Cobain, Mathew R. D. Schmitt, Natalie Donnelly, David Magozzi, Sarah Owen, Kylie Brown, Julie C. S. Escobar-Flores, Pablo Constantine, Rochelle O’Driscoll, Richard, L. Double, Mike Gales, Nick Childerhouse, Simon Pinkerton, Mathew H. Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas |
topic_facet |
feeding ecology δ15N δ13C amino acids MixSIAR isoscapes antarctica UNSDG14 Life Below Water ravintoketjut valaat levinneisyys ravinto meriensuojelu isotooppianalyysi antarktinen alue migraatio (biologia) aminohapot |
description |
Southern Ocean humpback whales Megaptera novaeangliae are capital breeders, breeding in the warm tropics/subtropics in the winter and migrating to nutrient-rich Antarctic feeding grounds in the summer. The classic feeding model is for the species to fast while migrating and breeding, surviving on blubber energy stores. Whilst northern hemisphere humpback whales are generalists, southern hemisphere counterparts are perceived as krill specialists, but for many populations, uncertainties remain regarding their diet and preferred feeding locations. This study used bulk and compound-specific stable isotope analyses and isoscape-based feeding location assignments to assess the diet, trophic ecology and likely feeding areas of humpback whales sampled in the Ross Sea region and around the Balleny Islands. Sampled whales had a mixed diet of plankton, krill and fish, similar to the diet of northern hemisphere humpback whales. Proportions of fish consumed varied but were often high (2–60%), thus challenging the widely held paradigm of Southern Ocean humpback whales being exclusive krill feeders. These whales had lower δ15N values and trophic position estimates than their northern hemisphere counterparts, likely due to lower Southern Ocean baseline δ15N surface water values and a lower percentage consumption of fish, respectively. Most whales fed in the Ross Sea shelf/slope and Balleny Islands high-productivity regions, but some isotopically distinct whales (mostly males) fed at higher trophic levels either around the Balleny Islands and frontal upwelling areas to the north, or en route to Antarctica in temperate waters off southern Australia and New Zealand. These results support other observations of humpback whales feeding during migration, highlighting the species’ dietary plasticity, which may increase their foraging and breeding success and provide them with greater resilience to anthropogenically mediated ecological change. This study highlights the importance of combining in situ field data with regional-scale ... |
format |
Article in Journal/Newspaper |
author |
Bury, Sarah J. Peters, Katharina J. Sabadel, Amandine J. M. St John Glew, Katie Trueman, Clive Wunder, M.B. Cobain, Mathew R. D. Schmitt, Natalie Donnelly, David Magozzi, Sarah Owen, Kylie Brown, Julie C. S. Escobar-Flores, Pablo Constantine, Rochelle O’Driscoll, Richard, L. Double, Mike Gales, Nick Childerhouse, Simon Pinkerton, Mathew H. |
author_facet |
Bury, Sarah J. Peters, Katharina J. Sabadel, Amandine J. M. St John Glew, Katie Trueman, Clive Wunder, M.B. Cobain, Mathew R. D. Schmitt, Natalie Donnelly, David Magozzi, Sarah Owen, Kylie Brown, Julie C. S. Escobar-Flores, Pablo Constantine, Rochelle O’Driscoll, Richard, L. Double, Mike Gales, Nick Childerhouse, Simon Pinkerton, Mathew H. |
author_sort |
Bury, Sarah J. |
title |
Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas |
title_short |
Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas |
title_full |
Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas |
title_fullStr |
Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas |
title_full_unstemmed |
Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas |
title_sort |
southern ocean humpback whale trophic ecology. i : combining multiple stable isotope methods elucidates diet, trophic position and foraging areas |
publisher |
Inter-Research Science Center |
publishDate |
2024 |
url |
http://urn.fi/URN:NBN:fi:jyu-202406074433 |
geographic |
Antarctic Balleny Islands New Zealand Ross Sea Southern Ocean |
geographic_facet |
Antarctic Balleny Islands New Zealand Ross Sea Southern Ocean |
genre |
Antarc* Antarctic Antarctica Balleny Islands Humpback Whale Megaptera novaeangliae Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Balleny Islands Humpback Whale Megaptera novaeangliae Ross Sea Southern Ocean |
op_relation |
Marine Ecology Progress Series 0171-8630 734 10.3354/meps14532 Bury, S. J., Peters, K. J., Sabadel, A. J. M., St John Glew, K., Trueman, C., Wunder, M.B., Cobain, M. R. D., Schmitt, N., Donnelly, D., Magozzi, S., Owen, K., Brown, J. C. S., Escobar-Flores, P., Constantine, R., O’Driscoll, R., Double, M., Gales, N., Childerhouse, S., & Pinkerton, M. H. (2024). Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas. Marine Ecology Progress Series , 734 , 123-155. https://doi.org/10.3354/meps14532 CONVID_215895955 URN:NBN:fi:jyu-202406074433 http://urn.fi/URN:NBN:fi:jyu-202406074433 |
op_rights |
CC BY 4.0 © 2024 the Authors openAccess https://creativecommons.org/licenses/by/4.0/ |
_version_ |
1802638074048413696 |
spelling |
ftjyvaeskylaenun:oai:jyx.jyu.fi:123456789/95672 2024-06-23T07:47:51+00:00 Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas Bury, Sarah J. Peters, Katharina J. Sabadel, Amandine J. M. St John Glew, Katie Trueman, Clive Wunder, M.B. Cobain, Mathew R. D. Schmitt, Natalie Donnelly, David Magozzi, Sarah Owen, Kylie Brown, Julie C. S. Escobar-Flores, Pablo Constantine, Rochelle O’Driscoll, Richard, L. Double, Mike Gales, Nick Childerhouse, Simon Pinkerton, Mathew H. 2024 application/pdf 123-155 fulltext http://urn.fi/URN:NBN:fi:jyu-202406074433 eng eng Inter-Research Science Center Marine Ecology Progress Series 0171-8630 734 10.3354/meps14532 Bury, S. J., Peters, K. J., Sabadel, A. J. M., St John Glew, K., Trueman, C., Wunder, M.B., Cobain, M. R. D., Schmitt, N., Donnelly, D., Magozzi, S., Owen, K., Brown, J. C. S., Escobar-Flores, P., Constantine, R., O’Driscoll, R., Double, M., Gales, N., Childerhouse, S., & Pinkerton, M. H. (2024). Southern Ocean humpback whale trophic ecology. I : Combining multiple stable isotope methods elucidates diet, trophic position and foraging areas. Marine Ecology Progress Series , 734 , 123-155. https://doi.org/10.3354/meps14532 CONVID_215895955 URN:NBN:fi:jyu-202406074433 http://urn.fi/URN:NBN:fi:jyu-202406074433 CC BY 4.0 © 2024 the Authors openAccess https://creativecommons.org/licenses/by/4.0/ feeding ecology δ15N δ13C amino acids MixSIAR isoscapes antarctica UNSDG14 Life Below Water ravintoketjut valaat levinneisyys ravinto meriensuojelu isotooppianalyysi antarktinen alue migraatio (biologia) aminohapot article http://purl.org/eprint/type/JournalArticle http://purl.org/coar/resource_type/c_2df8fbb1 publishedVersion A1 2024 ftjyvaeskylaenun 2024-06-11T23:48:57Z Southern Ocean humpback whales Megaptera novaeangliae are capital breeders, breeding in the warm tropics/subtropics in the winter and migrating to nutrient-rich Antarctic feeding grounds in the summer. The classic feeding model is for the species to fast while migrating and breeding, surviving on blubber energy stores. Whilst northern hemisphere humpback whales are generalists, southern hemisphere counterparts are perceived as krill specialists, but for many populations, uncertainties remain regarding their diet and preferred feeding locations. This study used bulk and compound-specific stable isotope analyses and isoscape-based feeding location assignments to assess the diet, trophic ecology and likely feeding areas of humpback whales sampled in the Ross Sea region and around the Balleny Islands. Sampled whales had a mixed diet of plankton, krill and fish, similar to the diet of northern hemisphere humpback whales. Proportions of fish consumed varied but were often high (2–60%), thus challenging the widely held paradigm of Southern Ocean humpback whales being exclusive krill feeders. These whales had lower δ15N values and trophic position estimates than their northern hemisphere counterparts, likely due to lower Southern Ocean baseline δ15N surface water values and a lower percentage consumption of fish, respectively. Most whales fed in the Ross Sea shelf/slope and Balleny Islands high-productivity regions, but some isotopically distinct whales (mostly males) fed at higher trophic levels either around the Balleny Islands and frontal upwelling areas to the north, or en route to Antarctica in temperate waters off southern Australia and New Zealand. These results support other observations of humpback whales feeding during migration, highlighting the species’ dietary plasticity, which may increase their foraging and breeding success and provide them with greater resilience to anthropogenically mediated ecological change. This study highlights the importance of combining in situ field data with regional-scale ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Balleny Islands Humpback Whale Megaptera novaeangliae Ross Sea Southern Ocean JYX - Jyväskylä University Digital Archive Antarctic Balleny Islands New Zealand Ross Sea Southern Ocean |