Demographic resilience of brook trout populations subjected to experimental size-selective

Shannon H. Clarke; Gregory R. McCracken; Shelley Humphries; Daniel E Ruzzante; James W.A. Grant; Dylan J. Fraser

doi:10.1111/eva.13478

Demographic resilience of brook trout populations subjected to experimental size-selective

Shannon H. Clarke, Gregory R. McCracken, Shelley Humphries, Daniel E Ruzzante, James W.A. Grant, Dylan J. Fraser

Medicine

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Sustainable management of exploited populations benefits from integrating demographic and genetic considerations into assessments, as both play a role in determining harvest yields and population persistence. This is especially important in populations subject to size-selective harvest, because size selective harvesting has the potential to result in significant demographic, life-history, and genetic changes. We investigated harvest-induced changes in the effective number of breeders ((Formula presented.)) for introduced brook trout populations (Salvelinus fontinalis) in alpine lakes from western Canada. Three populations were subject to 3 years of size-selective harvesting, while three control populations experienced no harvest. The (Formula presented.) decreased consistently across all harvested populations (on average 60.8%) but fluctuated in control populations. There were no consistent changes in (Formula presented.) between control or harvest populations, but one harvest population experienced a decrease in (Formula presented.) of 63.2%. The (Formula presented.) / (Formula presented.) ratio increased consistently across harvest lakes; however we found no evidence of genetic compensation (where variance in reproductive success decreases at lower abundance) based on changes in family evenness ((Formula presented.)) and the number of full-sibling families ((Formula presented.)). We found no relationship between (Formula presented.) and (Formula presented.) or between (Formula presented.) / (Formula presented.) and (Formula presented.). We posit that change in (Formula presented.) was buffered by constraints on breeding habitat prior to harvest, such that the same number of breeding sites were occupied before and after harvest. These results suggest that effective size in harvested populations may be resilient to considerable changes in N_c in the short-term, but it is still important to monitor exploited populations to assess the risk of inbreeding and ensure their long-term survival.

Original language	English
Journal	Evolutionary Applications
DOIs	https://doi.org/10.1111/eva.13478
Publication status	Accepted/In press - 2022

Bibliographical note

Funding Information:
We would like to thank D. Glaser, and B. Brookes for their significant contributions to data collection throughout the duration of the project. We would also like to thank all other members of the field team, including J. Budyk, H. Postma, G. Navarroli, N. Dupont, J. Beaulieu, C. Moir, A. Bourassa, J. Farkas, T. Ridgeon, and other volunteers on the project. This project would not have been possible without the support of Parks Canada for permits, logistical support, and use of their facilities. This work was supported by a Natural Sciences and Engineering Research Council (NSERC) Strategic Project Grant to D. Fraser, A. Derry, J. Post, and S. Rogers. S. Clarke was supported by an NSERC Canada Graduate Scholarship, and a collaborative partnership project award through the Interuniversity Research Group in Limnology (GRIL). G. McCracken was supported by an NSERC Strategic Project Grant to D. Ruzzante and NSERC Discovery grant (RGPIN‐2019‐04679) to D. Ruzzante.

Publisher Copyright:
© 2022 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.

ASJC Scopus Subject Areas

Ecology, Evolution, Behavior and Systematics
Genetics
General Agricultural and Biological Sciences

PubMed: MeSH publication types

Journal Article

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10.1111/eva.13478

Cite this

@article{ab22e8b58e27446bbf69508be82e1665,

title = "Demographic resilience of brook trout populations subjected to experimental size-selective",

abstract = "Sustainable management of exploited populations benefits from integrating demographic and genetic considerations into assessments, as both play a role in determining harvest yields and population persistence. This is especially important in populations subject to size-selective harvest, because size selective harvesting has the potential to result in significant demographic, life-history, and genetic changes. We investigated harvest-induced changes in the effective number of breeders ((Formula presented.)) for introduced brook trout populations (Salvelinus fontinalis) in alpine lakes from western Canada. Three populations were subject to 3 years of size-selective harvesting, while three control populations experienced no harvest. The (Formula presented.) decreased consistently across all harvested populations (on average 60.8%) but fluctuated in control populations. There were no consistent changes in (Formula presented.) between control or harvest populations, but one harvest population experienced a decrease in (Formula presented.) of 63.2%. The (Formula presented.) / (Formula presented.) ratio increased consistently across harvest lakes; however we found no evidence of genetic compensation (where variance in reproductive success decreases at lower abundance) based on changes in family evenness ((Formula presented.)) and the number of full-sibling families ((Formula presented.)). We found no relationship between (Formula presented.) and (Formula presented.) or between (Formula presented.) / (Formula presented.) and (Formula presented.). We posit that change in (Formula presented.) was buffered by constraints on breeding habitat prior to harvest, such that the same number of breeding sites were occupied before and after harvest. These results suggest that effective size in harvested populations may be resilient to considerable changes in Nc in the short-term, but it is still important to monitor exploited populations to assess the risk of inbreeding and ensure their long-term survival.",

author = "Clarke, {Shannon H.} and McCracken, {Gregory R.} and Shelley Humphries and Daniel E Ruzzante and Grant, {James W.A.} and Fraser, {Dylan J.}",

note = "Funding Information: We would like to thank D. Glaser, and B. Brookes for their significant contributions to data collection throughout the duration of the project. We would also like to thank all other members of the field team, including J. Budyk, H. Postma, G. Navarroli, N. Dupont, J. Beaulieu, C. Moir, A. Bourassa, J. Farkas, T. Ridgeon, and other volunteers on the project. This project would not have been possible without the support of Parks Canada for permits, logistical support, and use of their facilities. This work was supported by a Natural Sciences and Engineering Research Council (NSERC) Strategic Project Grant to D. Fraser, A. Derry, J. Post, and S. Rogers. S. Clarke was supported by an NSERC Canada Graduate Scholarship, and a collaborative partnership project award through the Interuniversity Research Group in Limnology (GRIL). G. McCracken was supported by an NSERC Strategic Project Grant to D. Ruzzante and NSERC Discovery grant (RGPIN‐2019‐04679) to D. Ruzzante. Publisher Copyright: {\textcopyright} 2022 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.",

year = "2022",

doi = "10.1111/eva.13478",

language = "English",

journal = "Evolutionary Applications",

issn = "1752-4563",

publisher = "Wiley-Blackwell",

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T1 - Demographic resilience of brook trout populations subjected to experimental size-selective

AU - Clarke, Shannon H.

AU - McCracken, Gregory R.

AU - Humphries, Shelley

AU - Ruzzante, Daniel E

AU - Grant, James W.A.

AU - Fraser, Dylan J.

N1 - Funding Information: We would like to thank D. Glaser, and B. Brookes for their significant contributions to data collection throughout the duration of the project. We would also like to thank all other members of the field team, including J. Budyk, H. Postma, G. Navarroli, N. Dupont, J. Beaulieu, C. Moir, A. Bourassa, J. Farkas, T. Ridgeon, and other volunteers on the project. This project would not have been possible without the support of Parks Canada for permits, logistical support, and use of their facilities. This work was supported by a Natural Sciences and Engineering Research Council (NSERC) Strategic Project Grant to D. Fraser, A. Derry, J. Post, and S. Rogers. S. Clarke was supported by an NSERC Canada Graduate Scholarship, and a collaborative partnership project award through the Interuniversity Research Group in Limnology (GRIL). G. McCracken was supported by an NSERC Strategic Project Grant to D. Ruzzante and NSERC Discovery grant (RGPIN‐2019‐04679) to D. Ruzzante. Publisher Copyright: © 2022 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.

PY - 2022

Y1 - 2022

N2 - Sustainable management of exploited populations benefits from integrating demographic and genetic considerations into assessments, as both play a role in determining harvest yields and population persistence. This is especially important in populations subject to size-selective harvest, because size selective harvesting has the potential to result in significant demographic, life-history, and genetic changes. We investigated harvest-induced changes in the effective number of breeders ((Formula presented.)) for introduced brook trout populations (Salvelinus fontinalis) in alpine lakes from western Canada. Three populations were subject to 3 years of size-selective harvesting, while three control populations experienced no harvest. The (Formula presented.) decreased consistently across all harvested populations (on average 60.8%) but fluctuated in control populations. There were no consistent changes in (Formula presented.) between control or harvest populations, but one harvest population experienced a decrease in (Formula presented.) of 63.2%. The (Formula presented.) / (Formula presented.) ratio increased consistently across harvest lakes; however we found no evidence of genetic compensation (where variance in reproductive success decreases at lower abundance) based on changes in family evenness ((Formula presented.)) and the number of full-sibling families ((Formula presented.)). We found no relationship between (Formula presented.) and (Formula presented.) or between (Formula presented.) / (Formula presented.) and (Formula presented.). We posit that change in (Formula presented.) was buffered by constraints on breeding habitat prior to harvest, such that the same number of breeding sites were occupied before and after harvest. These results suggest that effective size in harvested populations may be resilient to considerable changes in Nc in the short-term, but it is still important to monitor exploited populations to assess the risk of inbreeding and ensure their long-term survival.

AB - Sustainable management of exploited populations benefits from integrating demographic and genetic considerations into assessments, as both play a role in determining harvest yields and population persistence. This is especially important in populations subject to size-selective harvest, because size selective harvesting has the potential to result in significant demographic, life-history, and genetic changes. We investigated harvest-induced changes in the effective number of breeders ((Formula presented.)) for introduced brook trout populations (Salvelinus fontinalis) in alpine lakes from western Canada. Three populations were subject to 3 years of size-selective harvesting, while three control populations experienced no harvest. The (Formula presented.) decreased consistently across all harvested populations (on average 60.8%) but fluctuated in control populations. There were no consistent changes in (Formula presented.) between control or harvest populations, but one harvest population experienced a decrease in (Formula presented.) of 63.2%. The (Formula presented.) / (Formula presented.) ratio increased consistently across harvest lakes; however we found no evidence of genetic compensation (where variance in reproductive success decreases at lower abundance) based on changes in family evenness ((Formula presented.)) and the number of full-sibling families ((Formula presented.)). We found no relationship between (Formula presented.) and (Formula presented.) or between (Formula presented.) / (Formula presented.) and (Formula presented.). We posit that change in (Formula presented.) was buffered by constraints on breeding habitat prior to harvest, such that the same number of breeding sites were occupied before and after harvest. These results suggest that effective size in harvested populations may be resilient to considerable changes in Nc in the short-term, but it is still important to monitor exploited populations to assess the risk of inbreeding and ensure their long-term survival.

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DO - 10.1111/eva.13478

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Demographic resilience of brook trout populations subjected to experimental size-selective

Abstract

Bibliographical note

ASJC Scopus Subject Areas

PubMed: MeSH publication types

Access to Document

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