Small fish, large river: Surprisingly minimal genetic structure in a dispersal-limited, habitat specialist fish

Ecology and Evolution
Brooke A WashburnRebecca E Blanton

Abstract

Genetic connectivity is expected to be lower in species with limited dispersal ability and a high degree of habitat specialization (intrinsic factors). Also, gene flow is predicted to be limited by habitat conditions such as physical barriers and geographic distance (extrinsic factors). We investigated the effects of distance, intervening pools, and rapids on gene flow in a species, the Tuxedo Darter (Etheostoma lemniscatum), a habitat specialist that is presumed to be dispersal-limited. We predicted that the interplay between these intrinsic and extrinsic factors would limit dispersal and lead to genetic structure even at the small spatial scale of the species range (a 38.6 km river reach). The simple linear distribution of E. lemniscatum allowed for an ideal test of how these factors acted on gene flow and allowed us to test expectations (e.g., isolation-by-distance) of linearly distributed species. Using 20 microsatellites from 163 individuals collected from 18 habitat patches, we observed low levels of genetic structure that were related to geographic distance and rapids, though these factors were not barriers to gene flow. Pools separating habitat patches did not contribute to any observed genetic structure. Overall, E. le...Continue Reading

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Methods Mentioned

BETA
PCR
genotyping
PCA

Software Mentioned

GeneMarker
STRUCTURE
GENEPOP
GENETIX
ADEGENET
GenAlEx
‐ CHECKER
EEMS
Hereditec
R

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