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How spatio-temporal habitat connectivity affects amphibian genetic structure
Alexander G Watts1, Peter E Schlichting2, Shawn M Billerman3
1Department of Ecology & Evolutionary Biology, University of Toronto Toronto, ON, Canada.
Frontiers in Genetics
|October 7, 2015
Summary
Landscape genetics reveals how fluctuating wetland quality and connectivity impact boreal chorus frog dispersal and genetic structure. Understanding these dynamics is key for managing this dispersal-limited species.
Area of Science:
- Ecology
- Population Genetics
- Conservation Biology
Background:
- Species dispersal and genetic structure are influenced by landscape heterogeneity and environmental fluctuations.
- Effective species management requires understanding biotic and abiotic factors impacting population dynamics in variable environments.
Purpose of the Study:
- To evaluate how spatio-temporal habitat connectivity affects dispersal and genetic structure in boreal chorus frogs (Pseudacris maculata).
- To assess the influence of wetland characteristics and landscape matrix on genetic distance using a landscape genetics approach.
Main Methods:
- Developed gravity models to quantify functional connectivity based on genetic distance.
- Created three networks assessing connectivity via dispersal ability, temporal wetland quality variation, and stepping-stone wetlands.
- Analyzed genetic data from 322 boreal chorus frogs across 18 Colorado wetlands using 12 microsatellite loci.
Main Results:
- Genetic connectivity was significantly influenced by topographic complexity and moisture gradients within and between wetlands.
- Functional connectivity, particularly through stepping-stone wetlands, played a crucial role in genetic structure.
- Dynamic environmental factors and asynchronous interactions shape metapopulation structure for dispersal-limited species.
Conclusions:
- Habitat connectivity, especially dynamic wetland networks, is a critical determinant of genetic structure in boreal chorus frogs.
- Landscape genetics provides valuable insights into the effects of environmental fluctuations on dispersal-limited populations.
- Findings inform conservation strategies for species reliant on interconnected, yet variable, habitats.
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