Challenges to assessing connectivity between massive populations of the Australian plague locust

Chapuis Marie-Pierre, Popple Julie-Anne, Berthier Karine, Simpson Stephen J., Deveson Edward, Spurgin Peter, Steinbauer Martin, Sword Gregory A.. 2011. Challenges to assessing connectivity between massive populations of the Australian plague locust. Proceedings - Royal Society. Biological Sciences, 278 (1721) : 3152-3160.

Quartile : Q1, Sujet : ECOLOGY / Quartile : Q1, Sujet : BIOLOGY / Quartile : Q1, Sujet : EVOLUTIONARY BIOLOGY

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : 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, Chortoicetes terminifera, 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 C. terminifera 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 C. terminifera 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, m, 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.

Mots-clés Agrovoc : Chortoicetes terminifera, variation génétique, microsatellite, flux de gènes, dynamique des populations, migration animale, écologie animale, statistiques

Mots-clés géographiques Agrovoc : Australie

Classification Agris : H10 - Ravageurs des plantes
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Chapuis Marie-Pierre, CIRAD-BIOS-UPR Bioagresseurs (FRA)
• Popple Julie-Anne, University of Sydney (AUS)
• Berthier Karine, University of Sydney (AUS)
• Simpson Stephen J., University of Sydney (AUS)
• Deveson Edward, Australian Plague Locust Commission (AUS)
• Spurgin Peter, Australian Plague Locust Commission (AUS)
• Steinbauer Martin, Australian Plague Locust Commission (AUS)
• Sword Gregory A., University of Sydney (AUS)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/563884/)

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