Rapid depletion of genotypes with fast growth and bold personality traits from harvested fish populations.

Biro, PA; Post, JR

Rapid depletion of genotypes with fast growth and bold personality traits from harvested fish populations.

Biro, PA

Post, JR

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Publication Type:: Journal Article
Citation:: Proc Natl Acad Sci U S A, 2008, 105 (8), pp. 2919 - 2922
Issue Date:: 2008-02-26

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Field	Value	Language
dc.contributor.author	Biro, PA https://orcid.org/0000-0002-3565-240X	en_US
dc.contributor.author	Post, JR	en_US
dc.date.issued	2008-02-26	en_US
dc.identifier.citation	Proc Natl Acad Sci U S A, 2008, 105 (8), pp. 2919 - 2922	en_US
dc.identifier.uri	http://hdl.handle.net/10453/8770
dc.description.abstract	The possibility for fishery-induced evolution of life history traits is an important but unresolved issue for exploited fish populations. Because fisheries tend to select and remove the largest individuals, there is the evolutionary potential for lasting effects on fish production and productivity. Size selection represents an indirect mechanism of selection against rapid growth rate, because individual fish may be large because of rapid growth or because of slow growth but old age. The possibility for direct selection on growth rate, whereby fast-growing genotypes are more vulnerable to fishing irrespective of their size, is unexplored. In this scenario, faster-growing genotypes may be more vulnerable to fishing because of greater appetite and correspondingly greater feeding-related activity rates and boldness that could increase encounter with fishing gear and vulnerability to it. In a realistic whole-lake experiment, we show that fast-growing fish genotypes are harvested at three times the rate of the slow-growing genotypes within two replicate lake populations. Overall, 50% of fast-growing individuals were harvested compared with 30% of slow-growing individuals, independent of body size. Greater harvest of fast-growing genotypes was attributable to their greater behavioral vulnerability, being more active and bold. Given that growth is heritable in fishes, we speculate that evolution of slower growth rates attributable to behavioral vulnerability may be widespread in harvested fish populations. Our results indicate that commonly used minimum size-limits will not prevent overexploitation of fast-growing genotypes and individuals because of size-independent growth-rate selection by fishing.	en_US
dc.language	eng	en_US
dc.relation.ispartof	Proc Natl Acad Sci U S A	en_US
dc.relation.isbasedon	10.1073/pnas.0708159105	en_US
dc.subject.mesh	Animals	en_US
dc.subject.mesh	Trout	en_US
dc.subject.mesh	Aggression	en_US
dc.subject.mesh	Genetics, Population	en_US
dc.subject.mesh	Genotype	en_US
dc.subject.mesh	Fisheries	en_US
dc.subject.mesh	Selection, Genetic	en_US
dc.title	Rapid depletion of genotypes with fast growth and bold personality traits from harvested fish populations.	en_US
dc.type	Journal Article
utslib.citation.volume	8	en_US
utslib.citation.volume	105	en_US
utslib.location.activity	United States	en_US
utslib.for	0602 Ecology	en_US
dc.location.activity	ISI:000253567900032	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.issue	8	en_US
pubs.publication-status	Published	en_US
pubs.volume	105	en_US

Abstract:

The possibility for fishery-induced evolution of life history traits is an important but unresolved issue for exploited fish populations. Because fisheries tend to select and remove the largest individuals, there is the evolutionary potential for lasting effects on fish production and productivity. Size selection represents an indirect mechanism of selection against rapid growth rate, because individual fish may be large because of rapid growth or because of slow growth but old age. The possibility for direct selection on growth rate, whereby fast-growing genotypes are more vulnerable to fishing irrespective of their size, is unexplored. In this scenario, faster-growing genotypes may be more vulnerable to fishing because of greater appetite and correspondingly greater feeding-related activity rates and boldness that could increase encounter with fishing gear and vulnerability to it. In a realistic whole-lake experiment, we show that fast-growing fish genotypes are harvested at three times the rate of the slow-growing genotypes within two replicate lake populations. Overall, 50% of fast-growing individuals were harvested compared with 30% of slow-growing individuals, independent of body size. Greater harvest of fast-growing genotypes was attributable to their greater behavioral vulnerability, being more active and bold. Given that growth is heritable in fishes, we speculate that evolution of slower growth rates attributable to behavioral vulnerability may be widespread in harvested fish populations. Our results indicate that commonly used minimum size-limits will not prevent overexploitation of fast-growing genotypes and individuals because of size-independent growth-rate selection by fishing.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/8770