Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth

Life-time records of the trophic sources of carbon, nitrogen and of growth rate can be generated from biogenic structures that show accretionary growth, including fish scales, whale baleen and the teeth of some animals. Records generated from individual teeth can also be combined to provide longer t...

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Published in:Marine Ecology Progress Series
Main Authors: Hanson, Nora Nell, Wurster, Christopher Martin, Bird, Michael Ian, Reid, K, Boyd, Ian Lamont
Other Authors: University of St Andrews. School of Biology, University of St Andrews. Marine Alliance for Science & Technology Scotland, University of St Andrews. Sea Mammal Research Unit
Format: Article in Journal/Newspaper
Language:English
Published: 2013
Subjects:
Online Access:http://hdl.handle.net/10023/3969
https://doi.org/10.3354/meps08158
http://www.scopus.com/inward/record.url?scp=69849100913&partnerID=8YFLogxK
id ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/3969
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spelling ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/3969 2023-07-02T03:30:15+02:00 Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth Hanson, Nora Nell Wurster, Christopher Martin Bird, Michael Ian Reid, K Boyd, Ian Lamont University of St Andrews. School of Biology University of St Andrews. Marine Alliance for Science & Technology Scotland University of St Andrews. Sea Mammal Research Unit 2013-08-19 10 application/pdf http://hdl.handle.net/10023/3969 https://doi.org/10.3354/meps08158 http://www.scopus.com/inward/record.url?scp=69849100913&partnerID=8YFLogxK eng eng Marine Ecology Progress Series Hanson , N N , Wurster , C M , Bird , M I , Reid , K & Boyd , I L 2009 , ' Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth ' , Marine Ecology Progress Series , vol. 388 , pp. 263-272 . https://doi.org/10.3354/meps08158 0171-8630 PURE: 468851 PURE UUID: 2db88a74-0a62-41ec-a676-1cd5dcdf5fa5 standrews_research_output: 32165 Scopus: 69849100913 ORCID: /0000-0002-0017-8963/work/30346980 http://hdl.handle.net/10023/3969 https://doi.org/10.3354/meps08158 http://www.scopus.com/inward/record.url?scp=69849100913&partnerID=8YFLogxK (c) 2009 Inter-Research Annulus Dietary reconstruction Stable isotope Southern Ocean QH301 Biology SDG 14 - Life Below Water QH301 Journal article 2013 ftstandrewserep https://doi.org/10.3354/meps08158 2023-06-13T18:26:38Z Life-time records of the trophic sources of carbon, nitrogen and of growth rate can be generated from biogenic structures that show accretionary growth, including fish scales, whale baleen and the teeth of some animals. Records generated from individual teeth can also be combined to provide longer time series elucidating changes in environmental conditions encountered by a population. Both intrinsic (i.e. ontogenetic) and extrinsic (i.e. environmental) factors are important in modulating variation in growth and the apparent dietary sources of C and N. We used the canine teeth of a large marine predator, the male Antarctic fur seal Arctocephalus gazella from South Georgia, to investigate both intrinsic and extrinsic sources of variation. Substantial ontogenetic shifts occurred in both delta C-13 and delta N-15 values in individual teeth, indicating a change in the trophic sources of C and N as individual animals age. Over the 40 yr period from 1964 to 2005, and after statistical reduction of ontogenetic variation, we also detected long-term declines in delta C-13 and delta N-15 values, indicating that the population has become more dependent on energy from a lower trophic level. A concurrent decline in annular tooth growth may be a consequence of rapid population growth during this period. The time series of delta C-13 values was also inversely correlated with sea surface temperatures in the region, although isolating a causal relationship remains elusive. Our analyses suggest that both intrinsic and extrinsic sources of variation, and their interaction, must be considered from Such time series data; failure to do so could result in a biased interpretation. Publisher PDF Peer reviewed Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Southern Ocean University of St Andrews: Digital Research Repository Antarctic Southern Ocean Marine Ecology Progress Series 388 263 272
institution Open Polar
collection University of St Andrews: Digital Research Repository
op_collection_id ftstandrewserep
language English
topic Annulus
Dietary reconstruction
Stable isotope
Southern Ocean
QH301 Biology
SDG 14 - Life Below Water
QH301
spellingShingle Annulus
Dietary reconstruction
Stable isotope
Southern Ocean
QH301 Biology
SDG 14 - Life Below Water
QH301
Hanson, Nora Nell
Wurster, Christopher Martin
Bird, Michael Ian
Reid, K
Boyd, Ian Lamont
Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth
topic_facet Annulus
Dietary reconstruction
Stable isotope
Southern Ocean
QH301 Biology
SDG 14 - Life Below Water
QH301
description Life-time records of the trophic sources of carbon, nitrogen and of growth rate can be generated from biogenic structures that show accretionary growth, including fish scales, whale baleen and the teeth of some animals. Records generated from individual teeth can also be combined to provide longer time series elucidating changes in environmental conditions encountered by a population. Both intrinsic (i.e. ontogenetic) and extrinsic (i.e. environmental) factors are important in modulating variation in growth and the apparent dietary sources of C and N. We used the canine teeth of a large marine predator, the male Antarctic fur seal Arctocephalus gazella from South Georgia, to investigate both intrinsic and extrinsic sources of variation. Substantial ontogenetic shifts occurred in both delta C-13 and delta N-15 values in individual teeth, indicating a change in the trophic sources of C and N as individual animals age. Over the 40 yr period from 1964 to 2005, and after statistical reduction of ontogenetic variation, we also detected long-term declines in delta C-13 and delta N-15 values, indicating that the population has become more dependent on energy from a lower trophic level. A concurrent decline in annular tooth growth may be a consequence of rapid population growth during this period. The time series of delta C-13 values was also inversely correlated with sea surface temperatures in the region, although isolating a causal relationship remains elusive. Our analyses suggest that both intrinsic and extrinsic sources of variation, and their interaction, must be considered from Such time series data; failure to do so could result in a biased interpretation. Publisher PDF Peer reviewed
author2 University of St Andrews. School of Biology
University of St Andrews. Marine Alliance for Science & Technology Scotland
University of St Andrews. Sea Mammal Research Unit
format Article in Journal/Newspaper
author Hanson, Nora Nell
Wurster, Christopher Martin
Bird, Michael Ian
Reid, K
Boyd, Ian Lamont
author_facet Hanson, Nora Nell
Wurster, Christopher Martin
Bird, Michael Ian
Reid, K
Boyd, Ian Lamont
author_sort Hanson, Nora Nell
title Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth
title_short Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth
title_full Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth
title_fullStr Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth
title_full_unstemmed Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth
title_sort intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male antarctic fur seal teeth
publishDate 2013
url http://hdl.handle.net/10023/3969
https://doi.org/10.3354/meps08158
http://www.scopus.com/inward/record.url?scp=69849100913&partnerID=8YFLogxK
geographic Antarctic
Southern Ocean
geographic_facet Antarctic
Southern Ocean
genre Antarc*
Antarctic
Antarctic Fur Seal
Arctocephalus gazella
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctic Fur Seal
Arctocephalus gazella
Southern Ocean
op_relation Marine Ecology Progress Series
Hanson , N N , Wurster , C M , Bird , M I , Reid , K & Boyd , I L 2009 , ' Intrinsic and extrinsic forcing in life histories : patterns of growth and stable isotopes in male Antarctic fur seal teeth ' , Marine Ecology Progress Series , vol. 388 , pp. 263-272 . https://doi.org/10.3354/meps08158
0171-8630
PURE: 468851
PURE UUID: 2db88a74-0a62-41ec-a676-1cd5dcdf5fa5
standrews_research_output: 32165
Scopus: 69849100913
ORCID: /0000-0002-0017-8963/work/30346980
http://hdl.handle.net/10023/3969
https://doi.org/10.3354/meps08158
http://www.scopus.com/inward/record.url?scp=69849100913&partnerID=8YFLogxK
op_rights (c) 2009 Inter-Research
op_doi https://doi.org/10.3354/meps08158
container_title Marine Ecology Progress Series
container_volume 388
container_start_page 263
op_container_end_page 272
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