A potential role for restricted intertactical heritability in preventing intralocus conflict

Abstract Intralocus sexual conflict, which arises when the same trait has different fitness optima in males and females, reduces population growth rates. Recently, evolutionary biologists have recognized that intralocus conflict can occur between morphs or reproductive tactics within a sex and that...

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Autores principales:	Madilyn M. Gamble, Ryan G. Calsbeek
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	alternative reproductive tactics antagonistic selection heritability intralocus conflict Oncorhynchus kisutch Evolution QH359-425
Acceso en línea:	https://doaj.org/article/94c94633fa4044829c5c63514a7f37f8
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spelling	oai:doaj.org-article:94c94633fa4044829c5c63514a7f37f82021-11-15T07:15:49ZA potential role for restricted intertactical heritability in preventing intralocus conflict1752-457110.1111/eva.13292https://doaj.org/article/94c94633fa4044829c5c63514a7f37f82021-11-01T00:00:00Zhttps://doi.org/10.1111/eva.13292https://doaj.org/toc/1752-4571Abstract Intralocus sexual conflict, which arises when the same trait has different fitness optima in males and females, reduces population growth rates. Recently, evolutionary biologists have recognized that intralocus conflict can occur between morphs or reproductive tactics within a sex and that intralocus tactical conflict might constrain tactical dimorphism and population growth rates just as intralocus sexual conflict constrains sexual dimorphism and population growth rates. However, research has only recently focused on sexual and tactical intralocus conflict simultaneously, and there is no formal theory connecting the two. We present a graphical model of how tactical and sexual conflict over the same trait could constrain both sexual and tactical dimorphisms. We then use Coho salmon (Oncorhynchus kisutch), an important species currently protected under the Endangered Species Act, to investigate the possibility of simultaneous sexual and tactical conflict. Larger Coho males gain access to females through fighting while smaller males are favored through sneaking tactics, and female reproductive success is positively correlated with length. We tested for antagonistic selection on length at maturity among sexes and tactics and then used parent–offspring regression to calculate sex‐ and tactic‐specific heritabilities to determine whether and where intralocus conflict exists. Selection on length varied in intensity and form among tactics and years. Length was heritable between dams and daughters (h2 ± 95% CI = 0.361 ± 0.252) and between fighter males and their fighter sons (0.867 ± 0.312), but no other heritabilities differed significantly from zero. The lack of intertactical heritabilities in this system, combined with similar selection on length among tactics, suggests the absence of intralocus conflict between sexes and among tactics, allowing for the evolution of sexual and tactical dimorphisms. Our results suggest that Coho salmon populations are unlikely to be constrained by intralocus conflict or artificial selection on male tactic.Madilyn M. GambleRyan G. CalsbeekWileyarticlealternative reproductive tacticsantagonistic selectionheritabilityintralocus conflictOncorhynchus kisutchEvolutionQH359-425ENEvolutionary Applications, Vol 14, Iss 11, Pp 2576-2590 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	alternative reproductive tactics antagonistic selection heritability intralocus conflict Oncorhynchus kisutch Evolution QH359-425
spellingShingle	alternative reproductive tactics antagonistic selection heritability intralocus conflict Oncorhynchus kisutch Evolution QH359-425 Madilyn M. Gamble Ryan G. Calsbeek A potential role for restricted intertactical heritability in preventing intralocus conflict
description	Abstract Intralocus sexual conflict, which arises when the same trait has different fitness optima in males and females, reduces population growth rates. Recently, evolutionary biologists have recognized that intralocus conflict can occur between morphs or reproductive tactics within a sex and that intralocus tactical conflict might constrain tactical dimorphism and population growth rates just as intralocus sexual conflict constrains sexual dimorphism and population growth rates. However, research has only recently focused on sexual and tactical intralocus conflict simultaneously, and there is no formal theory connecting the two. We present a graphical model of how tactical and sexual conflict over the same trait could constrain both sexual and tactical dimorphisms. We then use Coho salmon (Oncorhynchus kisutch), an important species currently protected under the Endangered Species Act, to investigate the possibility of simultaneous sexual and tactical conflict. Larger Coho males gain access to females through fighting while smaller males are favored through sneaking tactics, and female reproductive success is positively correlated with length. We tested for antagonistic selection on length at maturity among sexes and tactics and then used parent–offspring regression to calculate sex‐ and tactic‐specific heritabilities to determine whether and where intralocus conflict exists. Selection on length varied in intensity and form among tactics and years. Length was heritable between dams and daughters (h2 ± 95% CI = 0.361 ± 0.252) and between fighter males and their fighter sons (0.867 ± 0.312), but no other heritabilities differed significantly from zero. The lack of intertactical heritabilities in this system, combined with similar selection on length among tactics, suggests the absence of intralocus conflict between sexes and among tactics, allowing for the evolution of sexual and tactical dimorphisms. Our results suggest that Coho salmon populations are unlikely to be constrained by intralocus conflict or artificial selection on male tactic.
format	article
author	Madilyn M. Gamble Ryan G. Calsbeek
author_facet	Madilyn M. Gamble Ryan G. Calsbeek
author_sort	Madilyn M. Gamble
title	A potential role for restricted intertactical heritability in preventing intralocus conflict
title_short	A potential role for restricted intertactical heritability in preventing intralocus conflict
title_full	A potential role for restricted intertactical heritability in preventing intralocus conflict
title_fullStr	A potential role for restricted intertactical heritability in preventing intralocus conflict
title_full_unstemmed	A potential role for restricted intertactical heritability in preventing intralocus conflict
title_sort	potential role for restricted intertactical heritability in preventing intralocus conflict
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/94c94633fa4044829c5c63514a7f37f8
work_keys_str_mv	AT madilynmgamble apotentialroleforrestrictedintertacticalheritabilityinpreventingintralocusconflict AT ryangcalsbeek apotentialroleforrestrictedintertacticalheritabilityinpreventingintralocusconflict AT madilynmgamble potentialroleforrestrictedintertacticalheritabilityinpreventingintralocusconflict AT ryangcalsbeek potentialroleforrestrictedintertacticalheritabilityinpreventingintralocusconflict
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A potential role for restricted intertactical heritability in preventing intralocus conflict

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