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Trophic position an...
Trophic position and foraging ecology of Ross, Weddell, and crabeater seals revealed by compound-specific isotope analysis
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- Brault, Emily K. (författare)
- University of California Santa Cruz
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- Koch, Paul L. (författare)
- University of California Santa Cruz
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- Costa, Daniel P. (författare)
- University of California Santa Cruz
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- McCarthy, Matthew D. (författare)
- University of California Santa Cruz
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- Hückstädt, Luis A. (författare)
- University of California Santa Cruz
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- Goetz, Kimberly T. (författare)
- National Institute of Water and Atmospheric Research, Wellington, New Zealand
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- McMahon, Kelton W. (författare)
- University of Rhode Island
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- Goebel, Michael E. (författare)
- Southwest Fisheries Science Center, La Jolla, USA
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- Karlsson, Olle (författare)
- Naturhistoriska riksmuseet,Enheten för miljöforskning och övervakning
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- Teilmann, Jonas (författare)
- Aarhus University
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- Harkonen, Tero (författare)
- Naturhistoriska riksmuseet,Enheten för miljöforskning och övervakning
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- Harding, Karin C., 1968 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,University of Gothenburg
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(creator_code:org_t)
- Inter-Research Science Center, 2019
- 2019
- Engelska.
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Ingår i: Marine Ecology Progress Series. - : Inter-Research Science Center. - 0171-8630 .- 1616-1599. ; 611, s. 1-18
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Abstract
Ämnesord
Stäng
- © The authors 2019. Ross seals Ommatophoca rossii are one of the least studied marine mammals, with little known about their foraging ecology. Research to date using bulk stable isotope analysis suggests that Ross seals have a trophic position intermediate between that of Weddell Leptonychotes weddellii and crabeater Lobodon carcinophaga seals. However, consumer bulk stable isotope values not only reflect trophic dynamics, but also variations in baseline isotope values, which can be substantial. We used compound-specific isotope analysis of amino acids (CSI-AA) to separate isotopic effects of a shifting baseline versus trophic structure on the foraging ecology of these ecologically important Antarctic pinnipeds. We found that Ross seals forage in an open ocean food web, while crabeater and Weddell seals forage within similar food webs closer to shore. However, isotopic evidence suggests that crabeater seals are likely following sea ice, while Weddell seals target productive areas of the continental shelf of West Antarctica. Our CSI-AA data indicate that Ross seals have a high trophic position equivalent to that of Weddell seals, contrary to prior conclusions from nitrogen isotope results on bulk tissues. CSI-AA indicates that crabeater seals are at a trophic position lower than that of Ross and Weddell seals, consistent with a krill-dominated diet. Our results redefine the view of the trophic dynamics and foraging ecology of the Ross seal, and also highlight the importance of quantifying baseline isotope variations in foraging studies.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- Amino acids
- Antarctica
- Compound-specific isotopes
- Crabeater
- Foraging ecology
- Ross seal
- Seal
- Trophic dynamics
- Weddell seal
- Man and the environment
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- ref (ämneskategori)
- art (ämneskategori)
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- Av författaren/redakt...
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Brault, Emily K.
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Koch, Paul L.
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Costa, Daniel P.
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McCarthy, Matthe ...
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Hückstädt, Luis ...
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Goetz, Kimberly ...
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visa fler...
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McMahon, Kelton ...
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Goebel, Michael ...
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Karlsson, Olle
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Teilmann, Jonas
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Harkonen, Tero
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Harding, Karin C ...
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visa färre...
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