Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach
Intra-species variability in foraging strategies may be common, which has significant implications for efforts to understand and manage enigmatic species like the whale shark Rhincodon typus. The ecological relevance of differences in tissue isotopes within and between individuals in the context of...
id |
ftunivsthongkong:oai:repository.ust.hk:1783.1-97965 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
The Hong Kong University of Science and Technology: HKUST Institutional Repository |
op_collection_id |
ftunivsthongkong |
language |
English |
topic |
Amino acid Assimilation Discrimination Elasmobranch Fasting Growth Nutritional history Radiocarbon Starvation Whale shark |
spellingShingle |
Amino acid Assimilation Discrimination Elasmobranch Fasting Growth Nutritional history Radiocarbon Starvation Whale shark Wyatt, Alex S.J. Matsumoto, Rui Chikaraishi, Yoshito Miyairi, Yousuke Yokoyama, Yusuke Sato, Keiichi Ohkouchi, Naohiko Nagata, Toshi Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach |
topic_facet |
Amino acid Assimilation Discrimination Elasmobranch Fasting Growth Nutritional history Radiocarbon Starvation Whale shark |
description |
Intra-species variability in foraging strategies may be common, which has significant implications for efforts to understand and manage enigmatic species like the whale shark Rhincodon typus. The ecological relevance of differences in tissue isotopes within and between individuals in the context of foraging however depends on understanding tissue turnover times and carbon (Δ 13 C) and nitrogen (Δ 15 N) discrimination, which can vary with physiology, metabolism, and diet quality. Here, we examine isotope dynamics in captive R. typus as a basis for enhanced ecological insights into wild populations of the world's largest fish and other enigmatic species. A variable diet, principally consisting of two krill (Euphausia pacifica and Euphausia superba) provided an average of 48 ± 20 MJ/d (mean ± SD), or 2.7 ± 1.3 times basal metabolic requirements. On this diet, in agreement with allometric relationships, large body sizes (3,000–4,000 kg) were matched by slow plasma and cartilage turnover rates (empirically derived as 9 months and 3 yr, respectively), which provide tissue-specific limits on the timescales over which we can isotopically detect diet changes in this species. Average diet-to-tissue discrimination showed significant variation between tissues (plasma and cartilage), and among growing and fasting individuals (Δ 13 C range, 1.5 to 5.5‰; Δ 15 N range, −0.1 to 2.9‰). Assimilation rates increased with temperature and were higher for the smaller E. pacifica (15 ± 2 mm) than E. superba (48 ± 2 mm). Growth significantly lowered both Δ 15 N plasma and Δ 15 N cartilage , with inappetence markedly reducing Δ 15 N plasma and Δ 13 C plasma , as well as significantly altering blood biochemistry. Captive findings facilitated the first robust multi-tissue growth- and nutrition-corrected isotope analysis of a wild R. typus population, suggesting individual foraging specialization on low trophic level mid-ocean or coastal prey. Long-term fasting during ocean-basin-scale migrations may be common and such metabolic effects should be carefully quantified when isotopically assessing intra-species foraging differences. The metabolically constrained multi-tissue, multi-isotope approach described can facilitate ecological insights that are indispensable for effective conservation and management of globally threatened, but poorly understood, species by identifying differences in key foraging areas and target prey within and between individuals. © 2018 The Authors. Ecological Monographs published by Wiley Periodicals, Inc. on behalf of Ecological Society of America |
format |
Article in Journal/Newspaper |
author |
Wyatt, Alex S.J. Matsumoto, Rui Chikaraishi, Yoshito Miyairi, Yousuke Yokoyama, Yusuke Sato, Keiichi Ohkouchi, Naohiko Nagata, Toshi |
author_facet |
Wyatt, Alex S.J. Matsumoto, Rui Chikaraishi, Yoshito Miyairi, Yousuke Yokoyama, Yusuke Sato, Keiichi Ohkouchi, Naohiko Nagata, Toshi |
author_sort |
Wyatt, Alex S.J. |
title |
Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach |
title_short |
Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach |
title_full |
Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach |
title_fullStr |
Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach |
title_full_unstemmed |
Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach |
title_sort |
enhancing insights into foraging specialization in the world's largest fish using a multi-tissue, multi-isotope approach |
publishDate |
2019 |
url |
http://repository.ust.hk/ir/Record/1783.1-97965 https://doi.org/10.1002/ecm.1339 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0012-9615&rft.volume=89&rft.issue=(1)&rft.date=2019&rft.spage=&rft.aulast=Wyatt&rft.aufirst=&rft.atitle=Enhancing+insights+into+foraging+specialization+in+the+world%27s+largest+fish+using+a+multi-tissue,+multi-isotope+approach&rft.title=Ecological+Monographs http://www.scopus.com/record/display.url?eid=2-s2.0-85060132664&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000457652200010 |
genre |
Euphausia superba |
genre_facet |
Euphausia superba |
op_relation |
http://repository.ust.hk/ir/Record/1783.1-97965 Ecological Monographs, v. 89, (1), February 2019, article number e01339 0012-9615 1557-7015 https://doi.org/10.1002/ecm.1339 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0012-9615&rft.volume=89&rft.issue=(1)&rft.date=2019&rft.spage=&rft.aulast=Wyatt&rft.aufirst=&rft.atitle=Enhancing+insights+into+foraging+specialization+in+the+world%27s+largest+fish+using+a+multi-tissue,+multi-isotope+approach&rft.title=Ecological+Monographs http://www.scopus.com/record/display.url?eid=2-s2.0-85060132664&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000457652200010 |
op_doi |
https://doi.org/10.1002/ecm.1339 |
container_title |
Ecological Monographs |
container_volume |
89 |
container_issue |
1 |
container_start_page |
e01339 |
_version_ |
1766404532522188800 |
spelling |
ftunivsthongkong:oai:repository.ust.hk:1783.1-97965 2023-05-15T16:08:29+02:00 Enhancing Insights Into Foraging Specialization in the World's Largest Fish Using a Multi-tissue, Multi-isotope Approach Wyatt, Alex S.J. Matsumoto, Rui Chikaraishi, Yoshito Miyairi, Yousuke Yokoyama, Yusuke Sato, Keiichi Ohkouchi, Naohiko Nagata, Toshi 2019 http://repository.ust.hk/ir/Record/1783.1-97965 https://doi.org/10.1002/ecm.1339 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0012-9615&rft.volume=89&rft.issue=(1)&rft.date=2019&rft.spage=&rft.aulast=Wyatt&rft.aufirst=&rft.atitle=Enhancing+insights+into+foraging+specialization+in+the+world%27s+largest+fish+using+a+multi-tissue,+multi-isotope+approach&rft.title=Ecological+Monographs http://www.scopus.com/record/display.url?eid=2-s2.0-85060132664&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000457652200010 English eng http://repository.ust.hk/ir/Record/1783.1-97965 Ecological Monographs, v. 89, (1), February 2019, article number e01339 0012-9615 1557-7015 https://doi.org/10.1002/ecm.1339 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0012-9615&rft.volume=89&rft.issue=(1)&rft.date=2019&rft.spage=&rft.aulast=Wyatt&rft.aufirst=&rft.atitle=Enhancing+insights+into+foraging+specialization+in+the+world%27s+largest+fish+using+a+multi-tissue,+multi-isotope+approach&rft.title=Ecological+Monographs http://www.scopus.com/record/display.url?eid=2-s2.0-85060132664&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000457652200010 Amino acid Assimilation Discrimination Elasmobranch Fasting Growth Nutritional history Radiocarbon Starvation Whale shark Article 2019 ftunivsthongkong https://doi.org/10.1002/ecm.1339 2019-09-03T18:30:35Z Intra-species variability in foraging strategies may be common, which has significant implications for efforts to understand and manage enigmatic species like the whale shark Rhincodon typus. The ecological relevance of differences in tissue isotopes within and between individuals in the context of foraging however depends on understanding tissue turnover times and carbon (Δ 13 C) and nitrogen (Δ 15 N) discrimination, which can vary with physiology, metabolism, and diet quality. Here, we examine isotope dynamics in captive R. typus as a basis for enhanced ecological insights into wild populations of the world's largest fish and other enigmatic species. A variable diet, principally consisting of two krill (Euphausia pacifica and Euphausia superba) provided an average of 48 ± 20 MJ/d (mean ± SD), or 2.7 ± 1.3 times basal metabolic requirements. On this diet, in agreement with allometric relationships, large body sizes (3,000–4,000 kg) were matched by slow plasma and cartilage turnover rates (empirically derived as 9 months and 3 yr, respectively), which provide tissue-specific limits on the timescales over which we can isotopically detect diet changes in this species. Average diet-to-tissue discrimination showed significant variation between tissues (plasma and cartilage), and among growing and fasting individuals (Δ 13 C range, 1.5 to 5.5‰; Δ 15 N range, −0.1 to 2.9‰). Assimilation rates increased with temperature and were higher for the smaller E. pacifica (15 ± 2 mm) than E. superba (48 ± 2 mm). Growth significantly lowered both Δ 15 N plasma and Δ 15 N cartilage , with inappetence markedly reducing Δ 15 N plasma and Δ 13 C plasma , as well as significantly altering blood biochemistry. Captive findings facilitated the first robust multi-tissue growth- and nutrition-corrected isotope analysis of a wild R. typus population, suggesting individual foraging specialization on low trophic level mid-ocean or coastal prey. Long-term fasting during ocean-basin-scale migrations may be common and such metabolic effects should be carefully quantified when isotopically assessing intra-species foraging differences. The metabolically constrained multi-tissue, multi-isotope approach described can facilitate ecological insights that are indispensable for effective conservation and management of globally threatened, but poorly understood, species by identifying differences in key foraging areas and target prey within and between individuals. © 2018 The Authors. Ecological Monographs published by Wiley Periodicals, Inc. on behalf of Ecological Society of America Article in Journal/Newspaper Euphausia superba The Hong Kong University of Science and Technology: HKUST Institutional Repository Ecological Monographs 89 1 e01339 |