Oxygen consumption was estimated in relation to ambient temperature in one hour respirometric runs in groups of A. flavicollis consisting of 2, 3, 4 and 5 individuals. For comparison similar determinations were carried out with single individuals. In the range of 5-20°C oxygen consumption computed for unit of body weight was found to be correlated with the numbers of individuals in a group. The lowest energy requirements were shown by individuals in groups consisting of 5 mice. Exceptionally at 25°C, due to increased locomotory activity of the animals, groups consisting of 4 and 5 individuals consumed more oxygen than those of 3.
During the captures of small mammals made near Werbkowice in the Hrubieszów district a young male shrew (Sorex araneus Linnaeus, 1758), the sex organs of which were distinctly enlarged, was caught on August 3rd, 1966. The dimensions of the individual (body length 58 mm, body weight 6 g) and also the small degree of wear of the teeth, appearance of the skull sutures and fur showed clearly that it was a young individual from the first litters of that year.
Examination was made of 17 different proteins coded by 36 loci (33 loci in spring) in the bank vole Clethrionomys glareolus (Schreber, 1780) caught in April-May (spring generation) and in SeptemberOctober (autumn generation). The autumn population consisted of resident and migrating individuals, while only resident voles were caught in spring. It was therefore possible to make comparisons of allele frequency, genotypie fixation indexes and heterozygosity (H) between these three groups of voles and to calculate genetic similarity. Thus H of resident individuals in autumn is 0.032 and migrants 0.035, while in spring this value is 0.042 in residents. The genetic similarity coefficients for migrants and residents were 0.970 (I), and 0.970 (S): and when resident individuals from spring and autumn are compared the figures are 0.946 (i) and 0.940 (S). Allele frequency in some of the loci examined fluctuates greatly in different groups of bank voles, the difference being greatest between residents in spring and autumn. Generally speaking it may be said that the differences obtained are more distinct between seasons than between resident and migrant individuals from the same season.[Mammals Res. Inst., Polish Acad. Sci., 17-230 Białowieża, Poland].
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.