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...
Published in: | Marine Ecology Progress Series |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2009
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-forcing-in-life-histories(2db88a74-0a62-41ec-a676-1cd5dcdf5fa5).html https://doi.org/10.3354/meps08158 https://research-repository.st-andrews.ac.uk/bitstream/10023/3969/1/HansonMarEcolProgSer388.pdf http://www.scopus.com/inward/record.url?scp=69849100913&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/2db88a74-0a62-41ec-a676-1cd5dcdf5fa5 2024-06-23T07:46:42+00:00 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 2009-08 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-forcing-in-life-histories(2db88a74-0a62-41ec-a676-1cd5dcdf5fa5).html https://doi.org/10.3354/meps08158 https://research-repository.st-andrews.ac.uk/bitstream/10023/3969/1/HansonMarEcolProgSer388.pdf http://www.scopus.com/inward/record.url?scp=69849100913&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-forcing-in-life-histories(2db88a74-0a62-41ec-a676-1cd5dcdf5fa5).html info:eu-repo/semantics/openAccess 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 Annulus Dietary reconstruction Stable isotope Southern Ocean article 2009 ftunstandrewcris https://doi.org/10.3354/meps08158 2024-06-13T00:22:24Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella Southern Ocean University of St Andrews: Research Portal Antarctic Southern Ocean Marine Ecology Progress Series 388 263 272 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Annulus Dietary reconstruction Stable isotope Southern Ocean |
spellingShingle |
Annulus Dietary reconstruction Stable isotope Southern Ocean 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 |
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. |
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 |
2009 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-forcing-in-life-histories(2db88a74-0a62-41ec-a676-1cd5dcdf5fa5).html https://doi.org/10.3354/meps08158 https://research-repository.st-andrews.ac.uk/bitstream/10023/3969/1/HansonMarEcolProgSer388.pdf 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_source |
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 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/intrinsic-and-extrinsic-forcing-in-life-histories(2db88a74-0a62-41ec-a676-1cd5dcdf5fa5).html |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1802647585957085184 |