Smirnov D G, Vekhnik V P
Izv Akad Nauk Ser Biol. 2009 Jan-Feb(1):88-94.
The spatial arrangement of individual bats of seven species and their tendency to form groups were studied in artificial caves of the Samara Luka during five winter periods (1999 and 2003-2006). It was demonstrated that formation of dense groups did not depend on the hibernating population size or density and was related to the biological characteristics of the species. Most Myotis brandtii and M. dasycneme (60-80% of the populations) wintered in groups. M. mystacinus, M. daubentonii, Pecotus auritus, M. nattereri, and Eptesicus nilssonii usually wintered singly (87% of the animals). In M. brandtii and M. dasycneme, as many as 78% of individual animals were in conspecific groups, whereas this proportion for the other species was no higher than 11%. All pairs of species exhibited negative assortativeness, which indicated a higher preference of spending winter in conspecific groups than in groups containing representatives of other species. Estimation of the ratios between groups containing animals of one and several species showed that conspecific groups were prevailing in M. brandtii and M. dasycneme, whereas all other species usually formed mixed groups.
在1999年以及2003 - 2006年的五个冬季期间，在萨马拉卢卡的人工洞穴中研究了七种蝙蝠个体的空间分布及其形成群体的倾向。结果表明，密集群体的形成并不取决于冬眠种群的大小或密度，而是与物种的生物学特性有关。大多数布氏鼠耳蝠和大足鼠耳蝠（种群的60 - 80%）成群冬眠。长耳蝠、水鼠耳蝠、毛腿鼠耳蝠、纳氏鼠耳蝠和艾氏鼠耳蝠通常单独冬眠（87%的个体）。在布氏鼠耳蝠和大足鼠耳蝠中，多达78%的个体处于同种群体中，而其他物种的这一比例不高于11%。所有成对物种均表现出负关联性，这表明与包含其他物种代表的群体相比，它们更倾向于在同种群体中过冬。对包含一种和几种物种个体的群体之间比例的估计表明，布氏鼠耳蝠和大足鼠耳蝠中同种群体占主导，而所有其他物种通常形成混合群体。
