Dispersal responses override density effects on genetic diversity during post-disturbance succession.

Smith, Annabel L, Landguth, Erin L, Bull, C Michael, Banks, Sam C, Gardner, Michael G and Driscoll, Don 2016, Dispersal responses override density effects on genetic diversity during post-disturbance succession., Proceedings of the royal society b: biological science, vol. 283, no. 1827, pp. 1-10, doi: 10.1098/rspb.2015.2934.

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Title Dispersal responses override density effects on genetic diversity during post-disturbance succession.
Author(s) Smith, Annabel L
Landguth, Erin L
Bull, C Michael
Banks, Sam C
Gardner, Michael G
Driscoll, DonORCID iD for Driscoll, Don orcid.org/0000-0002-1560-5235
Journal name Proceedings of the royal society b: biological science
Volume number 283
Issue number 1827
Start page 1
End page 10
Total pages 10
Publisher Royal Society Publishing
Place of publication London, Eng.
Publication date 2016-03-23
ISSN 1471-2954
Keyword(s) demographic population model
density dependence
fire
habitat fragmentation
landscape genetics
movement ecology
Summary Dispersal fundamentally influences spatial population dynamics but little is known about dispersal variation in landscapes where spatial heterogeneity is generated predominantly by disturbance and succession. We tested the hypothesis that habitat succession following fire inhibits dispersal, leading to declines over time in genetic diversity in the early successional geckoNephrurus stellatus We combined a landscape genetics field study with a spatially explicit simulation experiment to determine whether successional patterns in genetic diversity were driven by habitat-mediated dispersal or demographic effects (declines in population density leading to genetic drift). Initial increases in genetic structure following fire were likely driven by direct mortality and rapid population expansion. Subsequent habitat succession increased resistance to gene flow and decreased dispersal and genetic diversity inN. stellatus Simulated changes in population density alone did not reproduce these results. Habitat-mediated reductions in dispersal, combined with changes in population density, were essential to drive the field-observed patterns. Our study provides a framework for combining demographic, movement and genetic data with simulations to discover the relative influence of demography and dispersal on patterns of landscape genetic structure. Our results suggest that succession can inhibit connectivity among individuals, opening new avenues for understanding how disturbance regimes influence spatial population dynamics.
Language eng
DOI 10.1098/rspb.2015.2934
Field of Research 060207 Population Ecology
050204 Environmental Impact Assessment
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Royal Society Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083271

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