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Population dynamics of the marsupial Micoureus demerarae in small fragments of Atlantic Coastal Forest in Brazil

Published online by Cambridge University Press:  27 April 2001

TIAGO BOSISO QUENTAL
Affiliation:
Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68020, Rio de Janeiro RJ, 21941-590, Brazil
FERNANDO ANTONIO DOS SANTOS FERNANDEZ
Affiliation:
Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68020, Rio de Janeiro RJ, 21941-590, Brazil
ANDRÉ TAVARES CORRÊA DIAS
Affiliation:
Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68020, Rio de Janeiro RJ, 21941-590, Brazil
FLÁVIA SOUZA ROCHA
Affiliation:
Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Caixa Postal 68020, Rio de Janeiro RJ, 21941-590, Brazil

Abstract

Patterns of population fluctuation, reproductive activity and age structure were studied in populations of the marsupial Micoureus demerarae occupying two small (7.0 and 8.8 ha) fragments of Atlantic Coastal Forest in southeastern Brazil, from 1995 to 1998. Males, but not females, were observed to move between populations. Estimated sizes of the populations in each fragment were very small, usually below 20 individuals. Breeding usually occurred from September to April. Population peaks came mostly by the end of this season, the delay reflecting the time required for the young to become trappable. In August 1997, the area was hit by a fire severely affecting the smaller fragment. Populations were synchronous before the fire, although they became asynchronous after it, possibly in the short term only. Small population sizes, synchrony and presumable male-biased migration are all likely to make the set of populations more vulnerable to extinction than expected for a metapopulation.

Type
Research Article
Copyright
© 2001 Cambridge University Press

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