title: Isotopic partitioning by small mammals in the subnivium.
abstract: In the Arctic, food limitation is one of the driving factors behind small mammal population fluctuations. Active throughout the year, voles and lemmings (arvicoline rodents) are central prey in arctic food webs. Snow cover, however, makes the estimation of their winter diet challenging. We analyzed the isotopic composition of ever-growing incisors from species of voles and lemmings in northern Finland trapped in the spring and autumn. We found that resources appear to be reasonably partitioned and largely congruent with phylogeny. Our results reveal that winter resource use can be inferred from the tooth isotopic composition of rodents sampled in the spring, when trapping can be conducted, and that resources appear to be partitioned via competition under the snow.
authors.affiliation: GEGENAA - EA 3795 Université de Reims Champagne-Ardenne Reims France.
authors.forename: Ivan
authors.initials: I
authors.lastname: Calandra
authors.affiliation: Laboratoire PALEVO École Pratique des Hautes Études Dijon France ; Biogéosciences - UMR uB/CNRS 6282 Université Bourgogne Franche-Comté Dijon France.
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Labonne
authors.affiliation: Biogéosciences - UMR uB/CNRS 6282 Université Bourgogne Franche-Comté Dijon France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Mathieu
authors.affiliation: Natural Resources Institute Finland Vantaa Finland.
authors.forename: Heikki
authors.initials: H
authors.lastname: Henttonen
authors.affiliation: Biogéosciences - UMR uB/CNRS 6282 Université Bourgogne Franche-Comté Dijon France.
authors.forename: Jean
authors.initials: J
authors.lastname: Lévêque
authors.affiliation: Biogéosciences - UMR uB/CNRS 6282 Université Bourgogne Franche-Comté Dijon France.
authors.forename: Marie-Jeanne
authors.initials: MJ
authors.lastname: Milloux
authors.affiliation: Evo-Devo Lab Institute of Biotechnology University of Helsinki Helsinki Finland.
authors.forename: Élodie
authors.initials: É
authors.lastname: Renvoisé
authors.affiliation: Laboratoire PALEVO École Pratique des Hautes Études Dijon France ; Biogéosciences - UMR uB/CNRS 6282 Université Bourgogne Franche-Comté Dijon France.
authors.forename: Sophie
authors.initials: S
authors.lastname: Montuire
authors.affiliation: Laboratoire PALEVO École Pratique des Hautes Études Dijon France ; Biogéosciences - UMR uB/CNRS 6282 Université Bourgogne Franche-Comté Dijon France.
authors.forename: Nicolas
authors.identifier: 0000-0001-5694-4201
authors.initials: N
authors.lastname: Navarro
keywords: Arvicolinae; Lapland; carbon isotopes; foraging behavior; nitrogen isotopes; seasonality