Challenges to assessing connectivity between massive populations of the Australian plague locust
Identifieur interne : 001967 ( Pmc/Curation ); précédent : 001966; suivant : 001968Challenges to assessing connectivity between massive populations of the Australian plague locust
Auteurs : Marie-Pierre Chapuis [Australie, France] ; Julie-Anne M. Popple [Australie] ; Karine Berthier [Australie] ; Stephen J. Simpson [Australie] ; Edward Deveson [Australie] ; Peter Spurgin [Australie] ; Martin J. Steinbauer [Australie] ; Gregory A. Sword [Australie, États-Unis]Source :
- Proceedings of the Royal Society B: Biological Sciences [ 0962-8452 ] ; 2011.
Abstract
Linking demographic and genetic dispersal measures is of fundamental importance for movement ecology and evolution. However, such integration can be difficult, particularly for highly fecund species that are often the target of management decisions guided by an understanding of population movement. Here, we present an example of how the influence of large population sizes can preclude genetic approaches from assessing demographic population structuring, even at a continental scale. The Australian plague locust,
Url:
DOI: 10.1098/rspb.2010.2605
PubMed: 21389030
PubMed Central: 3158929
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<front><div type="abstract" xml:lang="en"><p>Linking demographic and genetic dispersal measures is of fundamental importance for movement ecology and evolution. However, such integration can be difficult, particularly for highly fecund species that are often the target of management decisions guided by an understanding of population movement. Here, we present an example of how the influence of large population sizes can preclude genetic approaches from assessing demographic population structuring, even at a continental scale. The Australian plague locust, <italic>Chortoicetes terminifera</italic>
, is a significant pest, with populations on the eastern and western sides of Australia having been monitored and managed independently to date. We used microsatellites to assess genetic variation in 12 <italic>C. terminifera</italic>
population samples separated by up to 3000 km. Traditional summary statistics indicated high levels of genetic diversity and a surprising lack of population structure across the entire range. An approximate Bayesian computation treatment indicated that levels of genetic diversity in <italic>C. terminifera</italic>
corresponded to effective population sizes conservatively composed of tens of thousands to several million individuals. We used these estimates and computer simulations to estimate the minimum rate of dispersal, <italic>m</italic>
, that could account for the observed range-wide genetic homogeneity. The rate of dispersal between both sides of the Australian continent could be several orders of magnitude lower than that typically considered as required for the demographic connectivity of populations.</p>
</div>
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<title-group><article-title>Challenges to assessing connectivity between massive populations of the Australian plague locust</article-title>
<alt-title alt-title-type="short">Genetic homogeneity across locust range</alt-title>
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<given-names>Marie-Pierre</given-names>
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<contrib contrib-type="author"><name><surname>Berthier</surname>
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</name>
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<contrib contrib-type="author"><name><surname>Simpson</surname>
<given-names>Stephen J.</given-names>
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<contrib contrib-type="author"><name><surname>Steinbauer</surname>
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<abstract><p>Linking demographic and genetic dispersal measures is of fundamental importance for movement ecology and evolution. However, such integration can be difficult, particularly for highly fecund species that are often the target of management decisions guided by an understanding of population movement. Here, we present an example of how the influence of large population sizes can preclude genetic approaches from assessing demographic population structuring, even at a continental scale. The Australian plague locust, <italic>Chortoicetes terminifera</italic>
, is a significant pest, with populations on the eastern and western sides of Australia having been monitored and managed independently to date. We used microsatellites to assess genetic variation in 12 <italic>C. terminifera</italic>
population samples separated by up to 3000 km. Traditional summary statistics indicated high levels of genetic diversity and a surprising lack of population structure across the entire range. An approximate Bayesian computation treatment indicated that levels of genetic diversity in <italic>C. terminifera</italic>
corresponded to effective population sizes conservatively composed of tens of thousands to several million individuals. We used these estimates and computer simulations to estimate the minimum rate of dispersal, <italic>m</italic>
, that could account for the observed range-wide genetic homogeneity. The rate of dispersal between both sides of the Australian continent could be several orders of magnitude lower than that typically considered as required for the demographic connectivity of populations.</p>
</abstract>
<kwd-group><kwd>approximate Bayesian computation</kwd>
<kwd>gene flow</kwd>
<kwd>migration rate</kwd>
<kwd>population size</kwd>
<kwd>power test</kwd>
</kwd-group>
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