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Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon.

Perrier C, Normandeau É, Dionne M, Richard A, Bernatchez L - Evol Appl (2014)

Bottom Line: Moreover, mature male parr boosted the number of alleles found among progenies.Finally, mature male parr were in average less related to anadromous females than were anadromous males, likely because of asynchronous sexual maturation between mature male parr and anadromous fish of a given cohort.By increasing Nb and allelic richness, and by decreasing inbreeding, the reproductive contribution of mature male parr has important evolutionary and conservation implications for declining Atlantic salmon populations.

View Article: PubMed Central - PubMed

Affiliation: Département de Biologie, Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval Québec, Canada.

ABSTRACT
While nonanadromous males (stream-resident and/or mature male parr) contribute to reproduction in anadromous salmonids, little is known about their impacts on key population genetic parameters. Here, we evaluated the contribution of Atlantic salmon mature male parr to the effective number of breeders (Nb) using both demographic (variance in reproductive success) and genetic (linkage disequilibrium) methods, the number of alleles, and the relatedness among breeders. We used a recently published pedigree reconstruction of a wild anadromous Atlantic salmon population in which 2548 fry born in 2010 were assigned parentage to 144 anadromous female and 101 anadromous females that returned to the river to spawn in 2009 and to 462 mature male parr. Demographic and genetic methods revealed that mature male parr increased population Nb by 1.79 and 1.85 times, respectively. Moreover, mature male parr boosted the number of alleles found among progenies. Finally, mature male parr were in average less related to anadromous females than were anadromous males, likely because of asynchronous sexual maturation between mature male parr and anadromous fish of a given cohort. By increasing Nb and allelic richness, and by decreasing inbreeding, the reproductive contribution of mature male parr has important evolutionary and conservation implications for declining Atlantic salmon populations.

No MeSH data available.


Related in: MedlinePlus

Boxplot of population's Nb estimates obtained from demographic (Demo(1)) and genetic (LDNe) methods for either only anadromous salmon or both anadromous fish and mature male parr with 100–2500 (increments of 100 progeny) progeny subsampled 1000 and 100 times for Demo(1) and LDNe, respectively.
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fig03: Boxplot of population's Nb estimates obtained from demographic (Demo(1)) and genetic (LDNe) methods for either only anadromous salmon or both anadromous fish and mature male parr with 100–2500 (increments of 100 progeny) progeny subsampled 1000 and 100 times for Demo(1) and LDNe, respectively.

Mentions: We compared demographic (Nb Demo(1)) and genetic estimates (Nb LDNe) of Nb for various numbers of progeny (Fig.3). As expected, the variance in Nb estimates decreased when an increasing number of progeny were resampled for both methods. The median values of the demographic estimates increased from 100 to 1500 juveniles sampled and then reached a plateau (Fig.3A). For instance, median values of Nb were 55, 148, and 208 for 100, 500, and 1500 progeny subsampled, respectively, (anadromous individuals and mature male parr included). In contrast, the median values for the genetic estimates varied only slightly with the number of progeny (Fig.3B). Median values of Nb were 223, 204, and 199 for 100, 500, and 1500 progeny subsampled, respectively, (anadromous individuals and mature male parr included). Similar trends were observed for datasets including only anadromous salmon or both anadromous fish and mature male parr.


Alternative reproductive tactics increase effective population size and decrease inbreeding in wild Atlantic salmon.

Perrier C, Normandeau É, Dionne M, Richard A, Bernatchez L - Evol Appl (2014)

Boxplot of population's Nb estimates obtained from demographic (Demo(1)) and genetic (LDNe) methods for either only anadromous salmon or both anadromous fish and mature male parr with 100–2500 (increments of 100 progeny) progeny subsampled 1000 and 100 times for Demo(1) and LDNe, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4231598&req=5

fig03: Boxplot of population's Nb estimates obtained from demographic (Demo(1)) and genetic (LDNe) methods for either only anadromous salmon or both anadromous fish and mature male parr with 100–2500 (increments of 100 progeny) progeny subsampled 1000 and 100 times for Demo(1) and LDNe, respectively.
Mentions: We compared demographic (Nb Demo(1)) and genetic estimates (Nb LDNe) of Nb for various numbers of progeny (Fig.3). As expected, the variance in Nb estimates decreased when an increasing number of progeny were resampled for both methods. The median values of the demographic estimates increased from 100 to 1500 juveniles sampled and then reached a plateau (Fig.3A). For instance, median values of Nb were 55, 148, and 208 for 100, 500, and 1500 progeny subsampled, respectively, (anadromous individuals and mature male parr included). In contrast, the median values for the genetic estimates varied only slightly with the number of progeny (Fig.3B). Median values of Nb were 223, 204, and 199 for 100, 500, and 1500 progeny subsampled, respectively, (anadromous individuals and mature male parr included). Similar trends were observed for datasets including only anadromous salmon or both anadromous fish and mature male parr.

Bottom Line: Moreover, mature male parr boosted the number of alleles found among progenies.Finally, mature male parr were in average less related to anadromous females than were anadromous males, likely because of asynchronous sexual maturation between mature male parr and anadromous fish of a given cohort.By increasing Nb and allelic richness, and by decreasing inbreeding, the reproductive contribution of mature male parr has important evolutionary and conservation implications for declining Atlantic salmon populations.

View Article: PubMed Central - PubMed

Affiliation: Département de Biologie, Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval Québec, Canada.

ABSTRACT
While nonanadromous males (stream-resident and/or mature male parr) contribute to reproduction in anadromous salmonids, little is known about their impacts on key population genetic parameters. Here, we evaluated the contribution of Atlantic salmon mature male parr to the effective number of breeders (Nb) using both demographic (variance in reproductive success) and genetic (linkage disequilibrium) methods, the number of alleles, and the relatedness among breeders. We used a recently published pedigree reconstruction of a wild anadromous Atlantic salmon population in which 2548 fry born in 2010 were assigned parentage to 144 anadromous female and 101 anadromous females that returned to the river to spawn in 2009 and to 462 mature male parr. Demographic and genetic methods revealed that mature male parr increased population Nb by 1.79 and 1.85 times, respectively. Moreover, mature male parr boosted the number of alleles found among progenies. Finally, mature male parr were in average less related to anadromous females than were anadromous males, likely because of asynchronous sexual maturation between mature male parr and anadromous fish of a given cohort. By increasing Nb and allelic richness, and by decreasing inbreeding, the reproductive contribution of mature male parr has important evolutionary and conservation implications for declining Atlantic salmon populations.

No MeSH data available.


Related in: MedlinePlus