Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations
Data on sampling variability in smolt abundance for Babine Lake sockeye salmon (Oncorhynchus nerka) are combined with a previous analysis to calculate a more accurate estimate of the degree of nonlinearity in the relation between smolts and adults. Results indicate significant within-stock nonlinear...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1982
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f82-121 http://www.nrcresearchpress.com/doi/pdf/10.1139/f82-121 |
id |
crcansciencepubl:10.1139/f82-121 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f82-121 2024-06-23T07:56:13+00:00 Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations Peterman, Randall M. 1982 http://dx.doi.org/10.1139/f82-121 http://www.nrcresearchpress.com/doi/pdf/10.1139/f82-121 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 39, issue 6, page 904-913 ISSN 0706-652X 1205-7533 journal-article 1982 crcansciencepubl https://doi.org/10.1139/f82-121 2024-05-30T08:13:49Z Data on sampling variability in smolt abundance for Babine Lake sockeye salmon (Oncorhynchus nerka) are combined with a previous analysis to calculate a more accurate estimate of the degree of nonlinearity in the relation between smolts and adults. Results indicate significant within-stock nonlinear mortality, large variability in mortality which tends to obscure any smolt-to-adult relation, or both. Analysis of age structure data identifies the first 15 mo of marine life as the period when most of this nonlinear or relation-masking mortality occurs. I also calculate the amount of smolt measurement error below which other salmon stocks are classed as having nonlinear marine survival. A distinct separation between even and odd brood year marine survival of Babine Lake sockeye suggests interactions with pink salmon. Juvenile pink salmon (O. gorbuscha) abundances correlate positively with residuals in Babine Lake sockeye survival for the same seaward migration year. This suggests a depensatory mortality effect which occurs later in the marine life stage than the possible within-population compensatory effect. Depensation is plausible because the size of pink fry equals that of sockeye smolts by August in coastal waters, permitting mutual swamping of predators. The paper concludes with implications for further enhancement.Key words: density dependence, marine survival, measurement error, enhancement, depensation, nonlinear, variability Article in Journal/Newspaper Pink salmon Canadian Science Publishing Sockeye ENVELOPE(-130.143,-130.143,54.160,54.160) Babine Lake ENVELOPE(-126.014,-126.014,54.776,54.776) Canadian Journal of Fisheries and Aquatic Sciences 39 6 904 913 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Data on sampling variability in smolt abundance for Babine Lake sockeye salmon (Oncorhynchus nerka) are combined with a previous analysis to calculate a more accurate estimate of the degree of nonlinearity in the relation between smolts and adults. Results indicate significant within-stock nonlinear mortality, large variability in mortality which tends to obscure any smolt-to-adult relation, or both. Analysis of age structure data identifies the first 15 mo of marine life as the period when most of this nonlinear or relation-masking mortality occurs. I also calculate the amount of smolt measurement error below which other salmon stocks are classed as having nonlinear marine survival. A distinct separation between even and odd brood year marine survival of Babine Lake sockeye suggests interactions with pink salmon. Juvenile pink salmon (O. gorbuscha) abundances correlate positively with residuals in Babine Lake sockeye survival for the same seaward migration year. This suggests a depensatory mortality effect which occurs later in the marine life stage than the possible within-population compensatory effect. Depensation is plausible because the size of pink fry equals that of sockeye smolts by August in coastal waters, permitting mutual swamping of predators. The paper concludes with implications for further enhancement.Key words: density dependence, marine survival, measurement error, enhancement, depensation, nonlinear, variability |
format |
Article in Journal/Newspaper |
author |
Peterman, Randall M. |
spellingShingle |
Peterman, Randall M. Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations |
author_facet |
Peterman, Randall M. |
author_sort |
Peterman, Randall M. |
title |
Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations |
title_short |
Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations |
title_full |
Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations |
title_fullStr |
Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations |
title_full_unstemmed |
Nonlinear Relation Between Smolts and Adults in Babine Lake Sockeye Salmon ( Oncorhynchus nerka) and Implications for Other Salmon Populations |
title_sort |
nonlinear relation between smolts and adults in babine lake sockeye salmon ( oncorhynchus nerka) and implications for other salmon populations |
publisher |
Canadian Science Publishing |
publishDate |
1982 |
url |
http://dx.doi.org/10.1139/f82-121 http://www.nrcresearchpress.com/doi/pdf/10.1139/f82-121 |
long_lat |
ENVELOPE(-130.143,-130.143,54.160,54.160) ENVELOPE(-126.014,-126.014,54.776,54.776) |
geographic |
Sockeye Babine Lake |
geographic_facet |
Sockeye Babine Lake |
genre |
Pink salmon |
genre_facet |
Pink salmon |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 39, issue 6, page 904-913 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f82-121 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
39 |
container_issue |
6 |
container_start_page |
904 |
op_container_end_page |
913 |
_version_ |
1802649180792946688 |