Predation by bears drives senescence in natural populations of salmon.
Classic evolutionary theory predicts that populations experiencing higher rates of environmentally caused ("extrinsic") mortality should senesce more rapidly, but this theory usually neglects plausible relationships between an individual's senescent condition and its susceptibility to...
Published in: | PLoS ONE |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Public Library of Science (PLoS)
2007
|
Subjects: | |
Online Access: | https://doi.org/10.1371/journal.pone.0001286 https://doaj.org/article/3fdefb32a92b4cc5afa81e8c0920a41f |
id |
ftdoajarticles:oai:doaj.org/article:3fdefb32a92b4cc5afa81e8c0920a41f |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:3fdefb32a92b4cc5afa81e8c0920a41f 2023-05-15T18:42:09+02:00 Predation by bears drives senescence in natural populations of salmon. Stephanie M Carlson Ray Hilborn Andrew P Hendry Thomas P Quinn 2007-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0001286 https://doaj.org/article/3fdefb32a92b4cc5afa81e8c0920a41f EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3280632?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0001286 https://doaj.org/article/3fdefb32a92b4cc5afa81e8c0920a41f PLoS ONE, Vol 2, Iss 12, p e1286 (2007) Medicine R Science Q article 2007 ftdoajarticles https://doi.org/10.1371/journal.pone.0001286 2022-12-31T08:17:32Z Classic evolutionary theory predicts that populations experiencing higher rates of environmentally caused ("extrinsic") mortality should senesce more rapidly, but this theory usually neglects plausible relationships between an individual's senescent condition and its susceptibility to extrinsic mortality. We tested for the evolutionary importance of this condition dependence by comparing senescence rates among natural populations of sockeye salmon (Oncorhynchus nerka) subject to varying degrees of predation by brown bears (Ursus arctos). We related senescence rates in six populations to (1) the overall rate of extrinsic mortality, and (2) the degree of condition dependence in this mortality. Senescence rates were determined by modeling the mortality of individually-tagged breeding salmon at each site. The overall rate of extrinsic mortality was estimated as the long-term average of the annual percentage of salmon killed by bears. The degree of condition dependence was estimated as the extent to which bears killed salmon that exhibited varying degrees of senescence. We found that the degree of condition dependence in extrinsic mortality was very important in driving senescence: populations where bears selectively killed fish showing advanced senescence were those that senesced least rapidly. The overall rate of extrinsic mortality also contributed to among-population variation in senescence-but to a lesser extent. Condition-dependent susceptibility to extrinsic mortality should be incorporated more often into theoretical models and should be explicitly tested in natural populations. Article in Journal/Newspaper Ursus arctos Directory of Open Access Journals: DOAJ Articles Sockeye ENVELOPE(-130.143,-130.143,54.160,54.160) PLoS ONE 2 12 e1286 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Stephanie M Carlson Ray Hilborn Andrew P Hendry Thomas P Quinn Predation by bears drives senescence in natural populations of salmon. |
topic_facet |
Medicine R Science Q |
description |
Classic evolutionary theory predicts that populations experiencing higher rates of environmentally caused ("extrinsic") mortality should senesce more rapidly, but this theory usually neglects plausible relationships between an individual's senescent condition and its susceptibility to extrinsic mortality. We tested for the evolutionary importance of this condition dependence by comparing senescence rates among natural populations of sockeye salmon (Oncorhynchus nerka) subject to varying degrees of predation by brown bears (Ursus arctos). We related senescence rates in six populations to (1) the overall rate of extrinsic mortality, and (2) the degree of condition dependence in this mortality. Senescence rates were determined by modeling the mortality of individually-tagged breeding salmon at each site. The overall rate of extrinsic mortality was estimated as the long-term average of the annual percentage of salmon killed by bears. The degree of condition dependence was estimated as the extent to which bears killed salmon that exhibited varying degrees of senescence. We found that the degree of condition dependence in extrinsic mortality was very important in driving senescence: populations where bears selectively killed fish showing advanced senescence were those that senesced least rapidly. The overall rate of extrinsic mortality also contributed to among-population variation in senescence-but to a lesser extent. Condition-dependent susceptibility to extrinsic mortality should be incorporated more often into theoretical models and should be explicitly tested in natural populations. |
format |
Article in Journal/Newspaper |
author |
Stephanie M Carlson Ray Hilborn Andrew P Hendry Thomas P Quinn |
author_facet |
Stephanie M Carlson Ray Hilborn Andrew P Hendry Thomas P Quinn |
author_sort |
Stephanie M Carlson |
title |
Predation by bears drives senescence in natural populations of salmon. |
title_short |
Predation by bears drives senescence in natural populations of salmon. |
title_full |
Predation by bears drives senescence in natural populations of salmon. |
title_fullStr |
Predation by bears drives senescence in natural populations of salmon. |
title_full_unstemmed |
Predation by bears drives senescence in natural populations of salmon. |
title_sort |
predation by bears drives senescence in natural populations of salmon. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2007 |
url |
https://doi.org/10.1371/journal.pone.0001286 https://doaj.org/article/3fdefb32a92b4cc5afa81e8c0920a41f |
long_lat |
ENVELOPE(-130.143,-130.143,54.160,54.160) |
geographic |
Sockeye |
geographic_facet |
Sockeye |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
PLoS ONE, Vol 2, Iss 12, p e1286 (2007) |
op_relation |
http://europepmc.org/articles/PMC3280632?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0001286 https://doaj.org/article/3fdefb32a92b4cc5afa81e8c0920a41f |
op_doi |
https://doi.org/10.1371/journal.pone.0001286 |
container_title |
PLoS ONE |
container_volume |
2 |
container_issue |
12 |
container_start_page |
e1286 |
_version_ |
1766231763761233920 |