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Migration, Patchiness, and Population Processes Illustrated by Two Migrant Pests

Migration, Patchiness, and Population Processes Illustrated by Two Migrant Pests AbstractNew technologies are improving scientists' understanding of the links between sources and destinations of subpopulations of migrants within populations as a whole (metapopulations). Such links and the importance of environmental patchiness are illustrated by migrations of two major pests, the red-billed quelea (Quelea quelea) and the desert locust (Schistocerca gregaria). The spatiotemporal distribution of rainfall determines where and when Quelea can breed, as shown for Quelea populations in southern Africa. Numbers and distributions of swarms of desert locusts in four different regions of their huge invasion area (29,000,000 km2) were analyzed as local populations of a metapopulation. Lagged cross-correlations of seasonally adjusted monthly data demonstrate links between the local populations, which vary in significance according to the pairings of regions analyzed and the lengths of the lags, illustrating the strength of the connectivity between them. Understanding such relationships is essential for predictions concerning future climate change scenarios. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png BioScience Oxford University Press

Migration, Patchiness, and Population Processes Illustrated by Two Migrant Pests

BioScience , Volume 57 (2) – Feb 1, 2007

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References (58)

Publisher
Oxford University Press
Copyright
© 2007 American Institute of Biological Sciences.
Subject
Overview Articles
ISSN
0006-3568
eISSN
1525-3244
DOI
10.1641/B570209
Publisher site
See Article on Publisher Site

Abstract

AbstractNew technologies are improving scientists' understanding of the links between sources and destinations of subpopulations of migrants within populations as a whole (metapopulations). Such links and the importance of environmental patchiness are illustrated by migrations of two major pests, the red-billed quelea (Quelea quelea) and the desert locust (Schistocerca gregaria). The spatiotemporal distribution of rainfall determines where and when Quelea can breed, as shown for Quelea populations in southern Africa. Numbers and distributions of swarms of desert locusts in four different regions of their huge invasion area (29,000,000 km2) were analyzed as local populations of a metapopulation. Lagged cross-correlations of seasonally adjusted monthly data demonstrate links between the local populations, which vary in significance according to the pairings of regions analyzed and the lengths of the lags, illustrating the strength of the connectivity between them. Understanding such relationships is essential for predictions concerning future climate change scenarios.

Journal

BioScienceOxford University Press

Published: Feb 1, 2007

Keywords: Keywords connectivity rainfall wind desert locust red-billed quelea

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