The independence of enzyme heterozygosity and life-history traits in natural populations of Salvelinus fontinalis (brook trout)

Hutchings, Jeffrey A.; Ferguson, Moira M.

doi:10.1038/hdy.1992.164

Cited by 14 publications

(15 citation statements)

References 36 publications

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“…First, in fishes, selection tends to favor smaller body size and/or earlier age-at-maturity in shallower streams because larger fish have reduced overwintering survival and/or higher predation risk than smaller fish due to a lack of deep habitat (Miller 1979; Hutchings 1990, 1993; Gende et al 2001). We might therefore expect BC fish to be smaller than WC fish.…”

Section: Introductionmentioning

confidence: 99%

Concurrent habitat and life history influences on effective/census population size ratios in stream‐dwelling trout

Belmar-Lucero

Wood

Scott

et al. 2012

Ecology and Evolution

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Lower effective sizes (Ne) than census sizes (N) are routinely documented in natural populations, but knowledge of how multiple factors interact to lower Ne/N ratios is often limited. We show how combined habitat and life-history influences drive a 2.4- to 6.1-fold difference in Ne/N ratios between two pristine brook trout (Salvelinus fontinalis) populations occupying streams separated by only 750 m. Local habitat features, particularly drainage area and stream depth, govern trout biomass produced in each stream. They also generate higher trout densities in the shallower stream by favoring smaller body size and earlier age-at-maturity. The combination of higher densities and reduced breeding site availability in the shallower stream likely leads to more competition among breeding trout, which results in greater variance in individual reproductive success and a greater reduction in Ne relative to N. A similar disparity between juvenile or adult densities and breeding habitat availability is reported for other species and hence may also result in divergent Ne/N ratios elsewhere. These divergent Ne/N ratios between adjacent populations are also an instructive reminder for species conservation programs that genetic and demographic parameters may differ dramatically within species.

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Section: Introductionmentioning

confidence: 99%

Concurrent habitat and life history influences on effective/census population size ratios in stream‐dwelling trout

Belmar-Lucero

Wood

Scott

et al. 2012

Ecology and Evolution

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show abstract

“…It is also not necessary for increased homozygosity to result in decreased fitness, although many examples of the phenomenon exist. For example, no correlation between heterozygosity and fitness was found in forked fungus beetles (Whitlock 1993), brook trout (Hutchings & Ferguson 1992), or a tropical palm (Eguiarte ef al. 1992).…”

Section: Introductionmentioning

confidence: 99%

Conservation genetics: beyond the maintenance of marker diversity

1994

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One of the major problems faced by conservation biologists is the allocation of scarce resources to an overwhelmingly large number of species in need of preservation efforts. Both demographic and genetic information have been brought to bear on this problem; however, the role of information obtained from genetic markers has largely been limited to the characterization of gene frequencies and patterns of diversity. While the genetic consequences of rarity may be a contributing factor to endangerment, it is widely recognized that demographic factors often may be more important. Because patterns of genetic marker variation are influenced by the same demographic factors of interest to the conservation biologist, it is possible to extract useful demographic information from genetic marker data. Such an approach may be productive for determining plant mating systems, inbreeding depression, effective population size, and metapopulation structure. In many cases, however, data consisting only of marker frequencies are inadequate for these purposes. Development of genealogical based analytical methods coupled with studies of DNA sequence variation within and among populations is likely to yield the most information on demographic processes from genetic marker data. Indeed, in some cases it may be the only means of obtaining information on the long‐term demographic properties that may be most useful for determining the future prospects of a species of interest.

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“…This is owing, in part, to the inherent di¤-culties in accurately measuring ¢tness traits of long-lived organisms in the natural environment (Hutchings & Ferguson 1992), and also to the tremendous e¡ort required to generate detailed pedigree data to quantify an individual's coancestry (Keller et al 1994). An alternate approach has been to produce relatively inbred and outbred individuals by controlled breeding in the laboratory, and then infer the in£uences of inbreeding on individual ¢tness following their release into the wild (Jimenez et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Birth weight and neonatal survival of harbour seal pups are positively correlated with genetic variation measured by microsatellites

Coltman

Bowen

Wright

1998

Proc. R. Soc. Lond. B

280

270

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We examined the relations between ¢tness-related traits of wild harbour seal (Phoca vitulina) pups with microsatellite heterozygosity, and with a measure of genomic diversity based on the mean squared distance between microsatellite alleles within an individual, mean d 2 . Birth weight was positively in£uenced by maternal age, pup sex, and either mean d 2 or individual heterozygosity in separate multiple regression models. The association of birth weight with mean d 2 was stronger than that with heterozygosity, however. The factors maternal age, pup sex, and mean d 2 combined to account for 36.8% of the variation in birth weight, with mean d 2 accounting for the greatest explanatory power (52.3% of the variance explained). Pups which survived until weaning had signi¢cantly higher mean d 2 than pups which died, independent of birth weight. These e¡ects are consistent with heterosis resulting from recent population mixing, and/or inbreeding depression in this population. Mean d 2 thus provides (i) a better measure of individual genetic variability than heterozygosity for microsatellite data; and (ii) a convenient tool for assessing the e¡ects of inbreeding and outbreeding in natural populations.

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The independence of enzyme heterozygosity and life-history traits in natural populations of Salvelinus fontinalis (brook trout)

Cited by 14 publications

References 36 publications

Concurrent habitat and life history influences on effective/census population size ratios in stream‐dwelling trout

Concurrent habitat and life history influences on effective/census population size ratios in stream‐dwelling trout

Conservation genetics: beyond the maintenance of marker diversity

Birth weight and neonatal survival of harbour seal pups are positively correlated with genetic variation measured by microsatellites

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