title: Effects of landscape design of forest reserves on Saproxylic beetle diversity.
abstract: Increasing the density of natural reserves in the forest landscape may provide conservation benefits for biodiversity within and beyond reserve borders. We used 2 French data sets on saproxylic beetles and landscape cover of forest reserves (LCFR) to test this hypothesis: national standardized data derived from 252 assessment plots in managed and reserve stands in 9 lowland and 5 highland forests and data from the lowland Rambouillet forest, a forested landscape where a pioneer conservation policy led to creation of a dense network of reserves. Abundance of rare and common saproxylic species and total saproxylic species richness were higher in forest reserves than in adjacent managed stands only in highland forests. In the lowland regional case study, as LCFR increased total species richness and common species abundance in reserves increased. In this case study, when there were two or more reserve patches, rare species abundance inside reserves was higher and common species richness in managed stands was higher than when there was a single large reserve. Spillover and habitat amount affected ecological processes underlying these landscape reserve effects. When LCFR positively affected species richness and abundance in reserves or managed stands, >12-20% reserve cover led to the highest species diversity and abundance. This result is consistent with the target of 17% forested land area in reserves set at the Nagoya biodiversity summit in 2010. Therefore, to preserve biodiversity we recommend at least doubling the current proportion of forest reserves in European forested landscapes.
authors.affiliation: National Research Institute of Science and Technology for Environment and Agriculture, Forest Ecosystems Research Unit, Domaine des Barres, F-45290, Nogent-sur-Vernisson, France.
authors.forename: C
authors.initials: C
authors.lastname: Bouget
authors.affiliation: National Research Institute of Science and Technology for Environment and Agriculture, Forest Ecosystems Research Unit, Domaine des Barres, F-45290, Nogent-sur-Vernisson, France.|National Laboratory of Forest Entomology, National Forest Office, F-11500, Quillan, France.|National Museum of Natural History, Natural Patrimony Department, 36 rue Geoffroy St Hilaire, CP 41 75 231, Paris, CEDEX 05, France.
authors.forename: G
authors.initials: G
authors.lastname: Parmain
mesh_terms: D000818:Animals; D044822:Biodiversity; D001517:Coleoptera / Q000502:physiology*; D003247:Conservation of Natural Resources / Q000379:methods*; D065928:Forests; D005602:France
keywords: SLOSS; bosque templado; cantidad de hábitat; efecto de derrame; forest management; habitat amount; manejo de bosques; spillover effect; temperate; umbral