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- W2119102736 abstract "Most population genetic studies in streams infer long-term patterns of gene flow by calculating fixation indices (e.g., FST) among sampled populations. In more-recent analytical methods, the need to assign individuals to populations a priori (clustering algorithms) is relaxed, and spatial autocorrelation analysis of allele frequencies (SA) is used to infer finer-scale and potentially short-term dispersal distances. We applied multiple methods to study the population genetic structure of the riverine caddisfly Stenopsyche marmorata (Trichoptera:Stenopsychidae) from 4 adjacent catchments in northeastern Japan. We genotyped larval individuals (N = 532) from 30 sites at 8 polymorphic microsatellite loci. Fixation indices suggested low levels of genetic differentiation among populations (global FST = 0.062, p < 0.01), and significant isolation-by-distance (IBD) indicated populations were in drift–migration equilibrium. Bayesian clustering separated S. marmorata into distinct upland (>250 m asl) and lowland populations, with different FST values (upland FST = 0.048, p < 0.01; lowland FST = 0.029, p < 0.01) and significant IBD only among upland populations. Allele frequencies were significantly positively autocorrelated (Moran’s I > 0, p < 0.05) at distances up to 18 km along streams and up to 12 km across terrestrial habitat. These values were similar to directly observed flight distance in a single generation for this species in the field. We conclude that the multiple-method approach revealed: 1) unexpected population subdivision between upland and lowland areas that may result from local adaptation, differences in phenology, and historical colonization by multiple lineages; and 2) fine-scale estimates of dispersal that match direct observations of flight and suggest gene flow is more pronounced along water courses in this species." @default.
- W2119102736 created "2016-06-24" @default.
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- W2119102736 date "2014-03-01" @default.
- W2119102736 modified "2023-10-16" @default.
- W2119102736 title "Fine-scale dispersal in a stream caddisfly inferred from spatial autocorrelation of microsatellite markers" @default.
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- W2119102736 doi "https://doi.org/10.1086/675076" @default.
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