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The Spatio-Temporal Structure of the Population Dynamics of the Norwegian Lemming (Lemmus lemmus L.) in Fennoscandia. P. 321–335

Версия для печати

Section: Biology

UDC

591.9:599.323.43

Authors

Lyudmila G. Emel’yanova *, Artem S. Oboturov*
*Lomonosov Moscow State University (Moscow, Russian Federation)
Corresponding author: Lyudmila Emel’yanova, address: MPO-1, Leninskie Gory, 1, stroeniе 12, Moscow, 119991, Russian Federation; e-mail: biosever@yandex.ru

Abstract

The endemic of Fennoscandia ‒ the Norwegian lemming (Lemmus lemmus L.) – was very abundant (at “the population peak”) in 2011‒2012. The paper presents data on the population status from 2009 to 2014 for 41 geographical locations: 37 points in the Kola Peninsula and 4 points in Norway and Northern Sweden. The spatio-temporal structure of the complete cycle (depression – peak – depression) of the species dynamics is analyzed. For the first time, we use a technique for mapping the state of the Norwegian lemming populations for each year of the cycle to study the spatio-temporal regularities in the population dynamics. Spatio-temporal and quantitative parameters of the cycle are summarized in the survey cadastral maps. A 4-point assessment of the population’s state is used: “the species is not found”, “the species is very rare”, “the species is common” and “the species is abundant”. Determination of the phase of the lemming cycle is carried out on the basis of censuring and visual assessment results. In 2009, we observed a depression in Norwegian lemming populations throughout the territory of Fennoscandia. According to available data, in 2010 a high number of lemmings was found in Northern Sweden and in the north of the Kola Peninsula (Kharlov Island and Yulya-Akkayarvi Lake). In 2011, we marked a peak in the number of Norwegian lemming practically throughout the entire territory of Fennoscandia, which was followed by a depression of 2012. A high population level was observed only in the south of the Kola Peninsula. In 2013‒2014, the depression covered the whole territory of Fennoscandia. The studied population peak of the Norwegian lemming in 2011‒2012 is the longest and the highest in the last 30 years.

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