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Related Experiment Video

Updated: Sep 20, 2025

Assessing Spatial Learning and Memory in Small Squamate Reptiles
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Spatial Replication Is Important for Developing Landscape Genetic Inferences for a Wetland Salamander.

Bryce S Wade1,2, Todd W Pierson3, Benjamin M Fitzpatrick4

  • 1Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, Tennessee, USA.

Molecular Ecology
|May 28, 2025
PubMed
Summary
This summary is machine-generated.

Replicated landscape genetics for the four-toed salamander (Hemidactylium scutatum) reveals habitat connectivity is influenced by forest cover and topography. Conserving moist forests free from roads is crucial for this threatened amphibian.

Keywords:
Hemidactylium scutatumconservation managementlandscape geneticsreplicationresistance surfacescale of effect

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Area of Science:

  • Landscape genetics
  • Conservation biology
  • Amphibian ecology

Background:

  • Habitat fragmentation threatens wildlife gene flow, necessitating effective conservation strategies.
  • Resistance surfaces are key tools for modeling landscape connectivity but show inconsistencies across studies.
  • Replicated landscape genetic analyses are vital for robustly understanding environmental influences on gene flow.

Purpose of the Study:

  • To conduct replicated landscape genetic analyses for the four-toed salamander (Hemidactylium scutatum) across five sites in Tennessee and Kentucky.
  • To test hypotheses on how landscape features (e.g., canopy cover) influence gene flow in a threatened amphibian.
  • To determine the appropriate spatial scales for modeling landscape features affecting gene flow.

Main Methods:

  • Utilized landscape genetic analyses across five distinct study sites.
  • Applied resistance surface modeling to assess gene flow patterns.
  • Tested various landscape features and spatial scales influencing connectivity for Hemidactylium scutatum.

Main Results:

  • Found concordance in the importance of forest cover and topography for gene flow, but also landscape-specific differences.
  • Observed discordance in the effective scale at which different landscape features influence gene flow.
  • Identified flat, moist forest areas not bisected by roads as critical for Hemidactylium scutatum.

Conclusions:

  • Replicated studies are essential for identifying consistent and variable drivers of gene flow across landscapes.
  • Conservation of moist forest habitats, particularly those lacking road fragmentation, is critical for four-toed salamander populations.
  • Understanding scale-dependent effects of landscape features improves the accuracy of connectivity models for conservation planning.