Isotopic partitioning by small mammals in the subnivium

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Calandra , I , Labonne , G , Mathieu , O , Henttonen , H , Leveque , J , Milloux , M-J , Renvoise , E , Montuire , S & Navarro , N 2015 , ' Isotopic partitioning by small mammals in the subnivium ' , Ecology and Evolution , vol. 5 , no. 18 , pp. 4132-4140 . https://doi.org/10.1002/ece3.1653

Title: Isotopic partitioning by small mammals in the subnivium
Author: Calandra, Ivan; Labonne, Gaelle; Mathieu, Olivier; Henttonen, Heikki; Leveque, Jean; Milloux, Marie-Jeanne; Renvoise, Elodie; Montuire, Sophie; Navarro, Nicolas
Contributor: University of Helsinki, Natural Resources Institute Finland (LUKE)
University of Helsinki, Institute of Biotechnology
Date: 2015-09
Language: eng
Number of pages: 9
Belongs to series: Ecology and Evolution
ISSN: 2045-7758
URI: http://hdl.handle.net/10138/162257
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.
Subject: Arvicolinae
carbon isotopes
foraging behavior
Lapland
nitrogen isotopes
seasonality
STABLE-ISOTOPE
NORWEGIAN LEMMINGS
DENSITY-DEPENDENCE
DIET COMPOSITION
HABITAT USE
CLETHRIONOMYS
POPULATION
VOLES
NITROGEN
FOOD
1181 Ecology, evolutionary biology
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