Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals
Copyright © 2007 Elsevier B.V. Fatty acid signature analysis of blubber has been used to study the foraging ecology of some marine mammals. However, species-specific information on fatty acid (FA) deposition, distribution and mobilization is required to develop further the application of FA as troph...
Published in: | Journal of Experimental Marine Biology and Ecology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier Science BV
2007
|
Subjects: | |
Online Access: | http://hdl.handle.net/2440/48258 https://doi.org/10.1016/j.jembe.2007.07.005 |
id |
ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/48258 |
---|---|
record_format |
openpolar |
spelling |
ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/48258 2023-05-15T18:43:24+02:00 Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals Wheatley, K. Nichols, P. Hindell, M. Harcourt, R. Bradshaw, C. 2007 http://hdl.handle.net/2440/48258 https://doi.org/10.1016/j.jembe.2007.07.005 en eng Elsevier Science BV Journal of Experimental Marine Biology and Ecology, 2007; 352(1):103-113 0022-0981 1879-1697 http://hdl.handle.net/2440/48258 doi:10.1016/j.jembe.2007.07.005 Bradshaw, C. [0000-0002-5328-7741] Blubber Diet Fatty acids Lactation Mobilization Journal article 2007 ftunivadelaidedl https://doi.org/10.1016/j.jembe.2007.07.005 2023-02-05T19:39:12Z Copyright © 2007 Elsevier B.V. Fatty acid signature analysis of blubber has been used to study the foraging ecology of some marine mammals. However, species-specific information on fatty acid (FA) deposition, distribution and mobilization is required to develop further the application of FA as trophic markers within the marine environment. Blubber samples were collected from adult female Weddell seals post-parturition and end of lactation, and were divided into inner and outer half sections. We determined the degree to which there was previous termvertical stratificationnext term in FA composition, and how this changed over the lactation period. Inner and outer layers of post-parturition blubber cores separated into two distinct groups. Sixty-two per cent of the dissimilarity between the two layers was accounted for by a higher abundance of monounsaturated fatty acids (18:1ω9c and 16:1ω7c) in the outer blubber layer, and more saturated fatty acids (16:0 and 14:0) in the inner layer. By end of lactation, the FA composition of the inner layer was different to post-parturition samples, and 20:5ω3 had the highest fractional mobilization of all FA. In contrast, the proportion of FA in the outer layer did not change, and there was more variability in the fractional mobilization of FA indicating mobilization was not uniform across the blubber layer. Dietary predictions changed considerably when highly mobilized FA were removed from analyses, and predictions were more consistent with previous dietary studies. The lack of uniformity in FA mobilization adds problems to the future use of FASA in dietary predictions, highlighting the need for more detailed information on FA mobilization. Kathryn E. Wheatley, Peter D. Nichols, Mark A. Hindell, Robert G. Harcourt and Corey J.A. Bradshaw http://www.elsevier.com/wps/find/journaldescription.cws_home/523011/description#description Article in Journal/Newspaper Weddell Seals The University of Adelaide: Digital Library Bradshaw ENVELOPE(163.867,163.867,-71.467,-71.467) Corey ENVELOPE(-145.133,-145.133,-76.667,-76.667) Harcourt ENVELOPE(172.417,172.417,-83.817,-83.817) Weddell Journal of Experimental Marine Biology and Ecology 352 1 103 113 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
Blubber Diet Fatty acids Lactation Mobilization |
spellingShingle |
Blubber Diet Fatty acids Lactation Mobilization Wheatley, K. Nichols, P. Hindell, M. Harcourt, R. Bradshaw, C. Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals |
topic_facet |
Blubber Diet Fatty acids Lactation Mobilization |
description |
Copyright © 2007 Elsevier B.V. Fatty acid signature analysis of blubber has been used to study the foraging ecology of some marine mammals. However, species-specific information on fatty acid (FA) deposition, distribution and mobilization is required to develop further the application of FA as trophic markers within the marine environment. Blubber samples were collected from adult female Weddell seals post-parturition and end of lactation, and were divided into inner and outer half sections. We determined the degree to which there was previous termvertical stratificationnext term in FA composition, and how this changed over the lactation period. Inner and outer layers of post-parturition blubber cores separated into two distinct groups. Sixty-two per cent of the dissimilarity between the two layers was accounted for by a higher abundance of monounsaturated fatty acids (18:1ω9c and 16:1ω7c) in the outer blubber layer, and more saturated fatty acids (16:0 and 14:0) in the inner layer. By end of lactation, the FA composition of the inner layer was different to post-parturition samples, and 20:5ω3 had the highest fractional mobilization of all FA. In contrast, the proportion of FA in the outer layer did not change, and there was more variability in the fractional mobilization of FA indicating mobilization was not uniform across the blubber layer. Dietary predictions changed considerably when highly mobilized FA were removed from analyses, and predictions were more consistent with previous dietary studies. The lack of uniformity in FA mobilization adds problems to the future use of FASA in dietary predictions, highlighting the need for more detailed information on FA mobilization. Kathryn E. Wheatley, Peter D. Nichols, Mark A. Hindell, Robert G. Harcourt and Corey J.A. Bradshaw http://www.elsevier.com/wps/find/journaldescription.cws_home/523011/description#description |
format |
Article in Journal/Newspaper |
author |
Wheatley, K. Nichols, P. Hindell, M. Harcourt, R. Bradshaw, C. |
author_facet |
Wheatley, K. Nichols, P. Hindell, M. Harcourt, R. Bradshaw, C. |
author_sort |
Wheatley, K. |
title |
Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals |
title_short |
Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals |
title_full |
Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals |
title_fullStr |
Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals |
title_full_unstemmed |
Temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating Weddell seals |
title_sort |
temporal variation in the vertical stratification of blubber fatty acids alters diet predictions for lactating weddell seals |
publisher |
Elsevier Science BV |
publishDate |
2007 |
url |
http://hdl.handle.net/2440/48258 https://doi.org/10.1016/j.jembe.2007.07.005 |
long_lat |
ENVELOPE(163.867,163.867,-71.467,-71.467) ENVELOPE(-145.133,-145.133,-76.667,-76.667) ENVELOPE(172.417,172.417,-83.817,-83.817) |
geographic |
Bradshaw Corey Harcourt Weddell |
geographic_facet |
Bradshaw Corey Harcourt Weddell |
genre |
Weddell Seals |
genre_facet |
Weddell Seals |
op_relation |
Journal of Experimental Marine Biology and Ecology, 2007; 352(1):103-113 0022-0981 1879-1697 http://hdl.handle.net/2440/48258 doi:10.1016/j.jembe.2007.07.005 Bradshaw, C. [0000-0002-5328-7741] |
op_doi |
https://doi.org/10.1016/j.jembe.2007.07.005 |
container_title |
Journal of Experimental Marine Biology and Ecology |
container_volume |
352 |
container_issue |
1 |
container_start_page |
103 |
op_container_end_page |
113 |
_version_ |
1766233794479652864 |