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

• Published in: Journal of tropical ecology 2001-05, Vol.17 (3), p.339-352
• Main Authors: QUENTAL, TIAGO BOSISO, DOS SANTOS FERNANDEZ, FERNANDO ANTONIO, CORRÊA DIAS, ANDRÉ TAVARES, SOUZA ROCHA, FLÁVIA
• Format: Article
• Language: English
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Animals; Atlantic Coastal Forest; Autoecology; Biological and medical sciences; Brazil; Coastal ecology; Coastal forests; Conservation biology; demography; Forest ecology; fragmentation; Fundamental and applied biological sciences. Psychology; Mammalia; Mammals; Marsupials; metapopulation; Metapopulation ecology; Metapopulations; Micoureus demerarae; Population ecology; Population estimates; Population size; Vertebrata
• ISSN: 0266-4674; 1469-7831
• DOI: 10.1017/S0266467401001237

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.