Effects of landscape dynamics on the metapopulation of a ground beetle (Coleoptera, Carabidae) in a hedgerow network
Agriculture Ecosystems & Environment
A study was made on the effects of recent landscape history on the subdivided populations of the carabid species Abax parallelepipedus in a hedgerow network. The distribution of this species on the site was strongly related to landscape connectivity. Occupied habitats are the least isolated from a source of colonizers. Connectivity measured as the distance to the nearest occupied site calculated along the hedgerow network and weighted by the quality of their wooded elements (WD) is a good predictor of the distribution of Abas parallelepipedus in the study area. Many landscape changes have occured between 1952 and 1993 both in the structure and the quality of the wooded network in this area. As a consequence, functional isolation between sample sites has increased by 28% since 1952. The results indicate that the current distribution of Abax parallelepipedus in the network is significantly better related to the 1952 landscape than to the current one. This may indicate the existence of a time lag between landscape changes and the reaction of Abax parallelepipedus to such modifications. The relationship remains the same over a brood range of spatial scales. This result should lead to the consideration of landscape history in species distribution analysis. (C) 1998 Elsevier Science B.V. All rights reserved.
Author(s): Petit, S; Burel, F
Journal: Agriculture Ecosystems & Environment