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• W2097588203 abstract "We searched for the presence of effects in the occupation of adjacent boreal-forest habitats by red- backed voles (Clethrionomys gapperi). First, we reviewed four models that differ in their predictions of abundance at habitat boundaries. Three of the models predicted an edge effect, while the so-called matrix or habitat model served as a null expectation. We then developed a protocol to detect, objectively, the ecotone between two habitats that is neces - sary to differentiate among the four models. The protocol revealed both abrupt and gradual ecotones along transects crossing conifer to cutover and conifer to deciduous habitats. Though vole density was almost always higher on one side of the ecotone than on the other, we were unable to detect an edge effect of any kind. Vole density within ecotones was intermediate to that on each side (refuting the existence of an ecotone effect). There were also no differ - ences in the pattern of density between abrupt and gradual ecotones (refuting the existence of a permeability effect), and no consistent pattern of vole density away from either type of ecotone (refuting the existence of a habitat-selection effect). Simulations that manipulated vole densities along the transects suggested, however, that the habitats may have been too similar to allow a habitat-selection effect to be detected. We suspect that our result will be common to mod- erately generalised species, and we recommend that controlled experiments be carried out to evaluate the conditions under which habitat-selecting species may exhibit edge effects. Resume : Nous avons tente de determiner si des effets de bordure affectaient l'occupation d'habitats boreaux-forestiers adjacents chez des Campagnols-a-dos-roux de Gapper (Clethrionomys gapperi). Nous avons d'abord reexamine quatre modeles qui donnent des previsions differentes de l'abondance en bordure des habitats. Trois des modeles prevoient un effet de bordure et le quatrieme, appele modele de la matrice ou modele de l'habitat, a servi d'hypothese nulle. Par la suite, nous avons mis au point un protocole dans le but de determiner objectivement quel ecotone entre deux habitats permettra de differencier les quatre modeles. Ce protocole a mis en lumiere des ecotones progressifs et des ecotones abrupts le long de transects allant des coniferes aux zones de coupe a blanc et des coniferes aux forets de decidus. La densite des campagnols etait toujours plus elevee d'un cote de l'ecotone que de l'autre, mais nous n'avons pas pu deceler d'effet de bordure de quelque type que ce soit. La densite des campagnols dans les ecotones etait intermediaire entre les densites enregistrees de chaque cote (refutant l'existence d'un effet d'ecotone). Il n'y avait pas non plus de difference dans les tendances de la densite entre l'ecotone graduel et l'ecotone abrupt (refutant l'existence d'un effet de permeabilite), et il n'y avait pas non plus de tendance definie de la densite loin de l'un ou l'autre type d'ecotone (refutant l'existence d'un effet du choix d'habitat). Des simulations au cours desquelles les densites des campagnols ont ete manipulees le long des transects ont indique, cependant, que les habitats peuvent avoir ete trop semblables pour que l'effet du choix d'habitat soit detecte. Nous soupconnons que nos resultats s'appliqueront a des especes modere - ment generalistes et nous recommandons des experiences en conditions controlees pour evaluer les conditions dans les- quelles les especes qui choisissent leur habitat manifesteront des effets de bordure. (Traduit par la Redaction) 2183" @default.
• W2097588203 created "2016-06-24" @default.
• W2097588203 creator A5041998704 @default.
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• W2097588203 date "2000-01-01" @default.
• W2097588203 modified "2023-09-26" @default.
• W2097588203 title "Voles looking for an edge: habitat selection across forest ecotones" @default.
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• W2097588203 doi "https://doi.org/10.1139/cjz-78-12-2174" @default.
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