title: Processes driving short-term temporal dynamics of small mammal distribution in human-disturbed environments.
abstract: As the impact of anthropogenic activities intensifies worldwide, an increasing proportion of landscape is converted to early successional stages every year. To understand and anticipate the global effects of the human footprint on wildlife, assessing short-term changes in animal populations in response to disturbance events is becoming increasingly important. We used isodar habitat selection theory to reveal the consequences of timber harvesting on the ecological processes that control the distribution dynamics of a small mammal, the red-backed vole (Myodes gapperi). The abundance of voles was estimated in pairs of cut and uncut forest stands, prior to logging and up to 2 years afterwards. A week after logging, voles did not display any preference between cut and uncut stands, and a non-significant isodar indicated that their distribution was not driven by density-dependent habitat selection. One month after harvesting, however, juvenile abundance increased in cut stands, whereas the highest proportions of reproductive females were observed in uncut stands. This distribution pattern appears to result from interference competition, with juveniles moving into cuts where there was weaker competition with adults. In fact, the emergence of source-sink dynamics between uncut and cut stands, driven by interference competition, could explain why the abundance of red-backed voles became lower in cut (the sink) than uncut (the source) stands 1-2 years after logging. Our study demonstrates that the influences of density-dependent habitat selection and interference competition in shaping animal distribution can vary frequently, and for several months, following anthropogenic disturbance.
authors.affiliation: Chaire de Recherche Industrielle CRSNG, Université Laval en Sylviculture et Faune, Québec, Canada.|Département de biologie, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: Julie
authors.initials: J
authors.lastname: Martineau
authors.affiliation: Chaire de Recherche Industrielle CRSNG, Université Laval en Sylviculture et Faune, Québec, Canada.|Département des sciences du bois et de la forêt, Université Laval, Québec, QC, G1V 0A6, Canada.
authors.forename: David
authors.initials: D
authors.lastname: Pothier
authors.affiliation: Chaire de Recherche Industrielle CRSNG, Université Laval en Sylviculture et Faune, Québec, Canada. Daniel.Fortin@bio.ulaval.ca.|Département de biologie, Université Laval, Québec, QC, G1V 0A6, Canada. Daniel.Fortin@bio.ulaval.ca.
authors.forename: Daniel
authors.initials: D
authors.lastname: Fortin
mesh_terms: D000818:Animals; D003411:Arvicolinae; D017753:Ecosystem; D065928:Forests; D012098:Reproduction
keywords: Anthropogenic disturbances; Habitat selection; Interference competition; Isodar; Red-backed vole