Titlebook: Social Systems and Population Cycles in Voles; Robert H. Tamarin,Richard S. Ostfeld,Gabriela Buja Book 1990 Springer Basel AG 1990 biology

確定方向

Social Organization and Mating System of the Prairie Vole, ,ommunal groups form, presumed monogamous pairs display traits normally associated with monogamy including cohabitation of a common nest, a shared home range, and dissolution of the pair primarily by mortality of one or both members. When juvenile nest mortality was reduced during late autumn-winter,

ironic

Population Constancy of the Rock Vole, ,, in Northeastern Minnesotaes), a result I attribute to artifacts of sampling. Numbers were constant in following years (all 19 sites). The standard deviation of the base-10 logarithm of population size, ., was 0.06 for 10 populations over 6 years, lower than all 45 values of . for 14 species of . and ., and lower than 17 of

objection

Patterns of Visitation in Prairie Voles , Reveal a Role for Males in Population Regulation periphery of home ranges of prairie voles . to continue our examination of the role of spacing behavior in population regulation. Resident and nonresident adult males captured at the outskirts of home ranges were reproductive rather than nonreproductive and did not differ in body weight. Although t

AVERT

角斗士

PAGAN

Social Organization and Population Control in the Pine Vole, ,parental groups, populations were self limiting at a mean of 16 animals per population. Birth of litters was limited largely to the single founding female. Reproduction ceased in 15 groups when populations grew and litter survival dropped to zero, and in the remaining groups when the founding mother

性上癮

A Comparative Study of Phenotypic Changes in , Social Organizationng systems seem to be more variable both between and within species in . than in .. Spacing behavior in . caused a temporary decline in population density in mid-summer, but in . a decline occurred only in the beginning of the breeding season. Habitat quality affected spacing behavior in similar way

施加

Social Structure of the Beach Vole, ,at of its mainland progenitor, the meadow vole ., with a few subtle, yet distinct, differences. The sex ratio of the beach vole is significantly biased toward males. The adult sex ratio of both beach vole and meadow vole populations exhibits dramatic fluctuations over several years, however the adul

FAR

plasma

Habitat-Dependent Reproductive Success in Bank Volesased on numbers of pregnancies. Reproductive opportunity in males was estimated based on inter- and intrasexual spatial patterns of males at the time of conception of pregnancies of females. Reproductive success of overwintered voles of both sexes was higher than that of young of the year. Reproduct