assemblage in a temperate rainforest in Chile

摘要: Small mammal population fluctuations and aspects of demography were studied over more than 4 years on two 0.81 ha live–trapping grids in a precordilleran primary growth temperate rainforest in southern Chile. Seven species of sigmodontine rodents plus a putative hybrid, and two marsupials were trapped; the majority of recaptures were of four sigmodontine species: Akodon olivaceus, A. longipilis, A. sanborni, and Oryzomys longicaudatus. Maximum numbers occurred in January-July (late summer to winter months) and minimum in August-December (late winter to early summer months). Annual A. olivaceus numbers fluctuated strongly whereas A. longipilis and A. sanborni remained relatively stable. Numbers of O. longicaudatus were sporadic and irruptive. Reproduction was predominantly seasonal, in spring to fall months (September-April) for all species; most recruitment of young occurred in January-May …