Calandra Ivan, Labonne Gaëlle, Mathieu Olivier, Henttonen Heikki, Lévêque Jean, Milloux Marie-Jeanne, Renvoisé Élodie, Montuire Sophie, Navarro Nicolas
GEGENAA - EA 3795 Université de Reims Champagne-Ardenne Reims France.
Laboratoire PALEVO École Pratique des Hautes Études Dijon France ; Biogéosciences - UMR uB/CNRS 6282 Université Bourgogne Franche-Comté Dijon France.
Ecol Evol. 2015 Sep 4;5(18):4132-40. doi: 10.1002/ece3.1653. eCollection 2015 Sep.
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.
在北极地区，食物限制是小型哺乳动物种群数量波动的驱动因素之一。田鼠和旅鼠（田鼠亚科啮齿动物）全年活跃，是北极食物网中的核心猎物。然而，积雪使得估算它们冬季的食物构成具有挑战性。我们分析了芬兰北部春季和秋季捕获的田鼠和旅鼠种类中不断生长的门齿的同位素组成。我们发现资源似乎得到了合理分配，并且在很大程度上与系统发育相一致。我们的结果表明，冬季资源利用情况可以从春季捕获的啮齿动物的牙齿同位素组成推断出来，因为此时可以进行捕获，而且资源似乎是在积雪下通过竞争进行分配的。
