Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies
Scientific surveys are widely used for stock assessment, but the estimated population parameters are based on the size-at-age relationship and age structure derived from a small subsample of the catch that is aged. This calls for an assessment of subsampling strategies, especially when population’s...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2019
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/cjfas-2017-0248 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0248 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0248 |
id |
crcansciencepubl:10.1139/cjfas-2017-0248 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/cjfas-2017-0248 2023-12-17T10:28:08+01:00 Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies Puerta, Patricia Johnson, Bethany Ciannelli, Lorenzo Helser, Thomas Lauth, Robert 2019 http://dx.doi.org/10.1139/cjfas-2017-0248 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0248 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0248 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 4, page 511-522 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2019 crcansciencepubl https://doi.org/10.1139/cjfas-2017-0248 2023-11-19T13:39:26Z Scientific surveys are widely used for stock assessment, but the estimated population parameters are based on the size-at-age relationship and age structure derived from a small subsample of the catch that is aged. This calls for an assessment of subsampling strategies, especially when population’s life history traits are spatially structured. In the Eastern Bering Sea, Pacific cod (Gadus macrocephalus) size and age are spatially structured, with younger and smaller individuals being more abundant at shallower depths. We conducted parallel subsamplings during Pacific cod surveys to compare two contrasting subsampling strategies: length-stratified and random. Geographical heterogeneity of Pacific cod length resulted in divergent estimates of ages between subsampling strategies. When this spatial variability was taken into account to estimate population parameters, random strategy provided more accurate mean and modal size-at-age and estimated age structure. Bias in the length-stratified subsampling arises from the poor efficacy in capturing the geographical patterns of size observed in the population. However, combining age data samples from multiple years helps to minimize the divergences between the two strategies. Article in Journal/Newspaper Bering Sea Canadian Science Publishing (via Crossref) Bering Sea Pacific Canadian Journal of Fisheries and Aquatic Sciences 76 4 511 522 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Puerta, Patricia Johnson, Bethany Ciannelli, Lorenzo Helser, Thomas Lauth, Robert Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Scientific surveys are widely used for stock assessment, but the estimated population parameters are based on the size-at-age relationship and age structure derived from a small subsample of the catch that is aged. This calls for an assessment of subsampling strategies, especially when population’s life history traits are spatially structured. In the Eastern Bering Sea, Pacific cod (Gadus macrocephalus) size and age are spatially structured, with younger and smaller individuals being more abundant at shallower depths. We conducted parallel subsamplings during Pacific cod surveys to compare two contrasting subsampling strategies: length-stratified and random. Geographical heterogeneity of Pacific cod length resulted in divergent estimates of ages between subsampling strategies. When this spatial variability was taken into account to estimate population parameters, random strategy provided more accurate mean and modal size-at-age and estimated age structure. Bias in the length-stratified subsampling arises from the poor efficacy in capturing the geographical patterns of size observed in the population. However, combining age data samples from multiple years helps to minimize the divergences between the two strategies. |
format |
Article in Journal/Newspaper |
author |
Puerta, Patricia Johnson, Bethany Ciannelli, Lorenzo Helser, Thomas Lauth, Robert |
author_facet |
Puerta, Patricia Johnson, Bethany Ciannelli, Lorenzo Helser, Thomas Lauth, Robert |
author_sort |
Puerta, Patricia |
title |
Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies |
title_short |
Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies |
title_full |
Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies |
title_fullStr |
Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies |
title_full_unstemmed |
Subsampling populations with spatially structured traits: a field comparison of stratified and random strategies |
title_sort |
subsampling populations with spatially structured traits: a field comparison of stratified and random strategies |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1139/cjfas-2017-0248 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2017-0248 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2017-0248 |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 4, page 511-522 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2017-0248 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
76 |
container_issue |
4 |
container_start_page |
511 |
op_container_end_page |
522 |
_version_ |
1785580172827688960 |