The problem of sampling families rather than populations: relatedness among individuals in samples of juvenile brown trout <i>Salmo trutta</i> L.

Hansen, Michael Møller; Nielsen, Einar Eg; Mensberg, Karen-Lise Dons

doi:10.1046/j.1365-294x.1997.t01-1-00202.x

Cited by 184 publications

(167 citation statements)

References 14 publications

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“…Early (soon after hatching) non-random kin associations have been demonstrated in other stream fishes, including Atlantic salmon (Salmo salar) (Olsen et al 2004;Einum and Nislow 2005), brown trout (Salmo trutta) (Hansen et al 1997;Hansen and Jensen 2005;Carlsson 2007;Sanz et al 2011) and high predation populations of guppies (Poecilia reticulata) (Piyapong et al 2011) and are likely to be demonstrated in future studies of additional species. Population-specific spatial variation in kin associations is likely to vary with environmental conditions and age of the individuals under consideration.…”

Section: Discussionmentioning

confidence: 85%

Sampling strategies for estimating brook trout effective population size

et al. 2012

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The influence of sampling strategy on estimates of effective population size (N e ) from single-sample genetic methods has not been rigorously examined, though these methods are increasingly used. For headwater salmonids, spatially close kin association among age-0 individuals suggests that sampling strategy (number of individuals and location from which they are collected) will influence estimates of N e through family representation effects. We collected age-0 brook trout by completely sampling three headwater habitat patches, and used microsatellite data and empirically parameterized simulations to test the effects of different combinations of sample size (S = 25, 50, 75, 100, 150, or 200) and number of equally-spaced sample starting locations (SL = 1, 2, 3, 4, or random) on estimates of mean family size and effective number of breeders (N b ). Both S and SL had a strong influence on estimates of mean family size andN b ; however the strength of the effects varied among habitat patches that varied in family spatial distributions. The sampling strategy that resulted in an optimal balance between precise estimates of N b and sampling effort regardless of family structure occurred with S = 75 and SL = 3. This strategy limited bias by ensuring samples contained individuals from a high proportion of available families while providing a large enough sample size for precise estimates. Because this sampling effort performed well for populations that vary in family structure, it should provide a generally applicable approach for genetic monitoring of iteroparous headwater stream fishes that have overlapping generations.

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Section: Discussionmentioning

confidence: 85%

Sampling strategies for estimating brook trout effective population size

et al. 2012

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“…If fish remain in the vicinity of their hatching location until maturity (see for example, Allendorf and Phelps, 1981;Hansen et al, 1997), most individuals collected in those two small lakes could likely be derived from a small number of progenitors only. Mating could then be biased toward relatives if most dispersal opportunities are restricted to the close surroundings of the lakes.…”

Section: Discussionmentioning

confidence: 99%

Heterozygote deficiencies in small lacustrine populations of brook charr Salvelinus Fontinalis Mitchill (Pisces, Salmonidae): a test of alternative hypotheses

et al. 2002

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Empirical studies of natural populations have commonly reported departures from Hardy-Weinberg expected proportions of heterozygote individuals. Recent advances in statistical population genetics now offer the potential to exploit individual multilocus genotypic information to test more rigorously for possible sources of heterozygote deficiencies. In a previous study in lacustrine brook charr (Salvelinus fontinalis), we reported stronger deficits in small than in large lakes. In the present paper, we propose a methodology for empirically testing alternative hypotheses to identify the cause of the deficits observed in three of the smallest lakes (85, 109 and 182 ha) analysed. First, as in several salmonid species, brook charr may exhibit a trophic polymorphism in north temperate lakes. If morphs are genetically divergent, indiscriminate sampling of both forms would result in less heterozygote individuals than expected

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“…Specifically haplotypes 1, 18, 22 and 23 were present only in the Monterivoso population and could represent the pool of the putative native mtDNA haplotypes (see also Caputo et al 2004). The existence of a separate cluster containing three haplotypes (upper cluster of figure 2) mainly occurring in the Irish population, and the fact that just three of them were previously observed in Danish populations (Hansen & Loeschcke 1996;Hansen et al 1997), suggest the non-Danish origin of the entire Atlantic stocks implied in the Central-Western Italy restocking. The existence of such restocking practice with allochthonous stock is confirmed by LDH-C1* analysis, which reveals the presence of several hybrids showing the characteristic Atlantic allele (Table II).…”

Section: Discussionmentioning

confidence: 84%

Genetic characterization of a putative indigenous brown trout (Salmo truttafario) population in a secondary stream of the Nera River Basin (Central Italy) assessed by means of three molecular markers

Lucentini

Palomba

Gigliarelli

et al. 2006

Italian Journal of Zoology

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Genetic diversity was analysed in a putative autochthonous brown trout (Salmo trutta fario L.) population (Monterivoso Stream, Tyrrhenian Apennine Slope) by means of seven microsatellite loci and PCR-RFLP of two mitochondrial (ND1 and ND5/6) and one nuclear (LDH-C1*) locus. Monterivoso data were compared to those obtained analysing populations of the same basin (Nera River) and of the Po basin; Irish populations were used as a source of Atlantic strain brown trout. Haplotypes distributions, heterozygosity, F-statistic and UPGMA analyses indicated a genetic diversification between these populations, suggesting a widespread alteration of the genetic structure due to repeated stocking with allochthonous material, mainly of Atlantic origin, that has partially polluted the Monterivoso population. This population appeared to be constituted of Mediterranean strain samples and might represent a residue of an indigenous pool: it shows high specificity characteristics and it is genetically separate from the others observed and from populations of the Adriatic slope of the Apennines. This population should be employed in managing and breeding programmes finalised to an eco-sustainable restocking of brown trout in the Nera River Basin, with periodic monitoring by genetic analyses.

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The problem of sampling families rather than populations: relatedness among individuals in samples of juvenile brown trout Salmo trutta L.

Cited by 184 publications

References 14 publications

Sampling strategies for estimating brook trout effective population size

Sampling strategies for estimating brook trout effective population size

Heterozygote deficiencies in small lacustrine populations of brook charr Salvelinus Fontinalis Mitchill (Pisces, Salmonidae): a test of alternative hypotheses

Genetic characterization of a putative indigenous brown trout (Salmo truttafario) population in a secondary stream of the Nera River Basin (Central Italy) assessed by means of three molecular markers

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