Algumas observações sobre o ciclo reprodutivo anual de fêmeas do gambá Didelphis albiventris (Lund, 1841) (Marsupialia, Didelphidae) em populações naturais no Estado de Minas Gerais, Brasil

Rigueira, Sônia Elias; Valle, Célio Murilo de Carvalho; Varejão, José Benedito Malta; Albuquerque, Patrícia Velloso de; Nogueira, José Carlos

doi:10.1590/s0101-81751987000200005

Cited by 13 publications

(9 citation statements)

References 4 publications

(1 reference statement)

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“…Reproduction occurred during the rainy season in three of the four species, which is in agreement with other studies of tropical small mammals (Bergallo, 1994; Bergallo and Cerqueira, 1994;Cerqueira, 1984;Cerqueira and Lara, 1991;Cerqueira et al, 1989;Dietz, 1983;Fleming, 1971;Rigueira et al, 1987;Streilein, 1982). Nevertheless, the species reproduced sequentially, beginning with N. squamipes, followed by O. intermedius, and finishing with T. iheringi.…”

supporting

confidence: 91%

Effects of Climate and Food Availability on Four Rodent Species in Southeastern Brazil

Bergallo

Magnusson

1999

Journal of Mammalogy

129

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. American Society of Mammalogists is collaborating with JSTOR to digitize, preserve and extend access to Journal of Mammalogy.Seasonal reproduction of small mammals in the tropics usually is related to annual cycles of rainfall. We examined effects of weather and food availability on reproduction and population ecology of Nectomys squamipes, Oryzomys intermedius, Akodon cursor and Trinomys iheringi. Each species was studied monthly from February 1993 to January 1995 using mark-recapture methods at Ilha do Cardoso, Sio Paulo State, Brazil. Average capture rate for each month was used as an index of population size, and survival rate was estimated by the Jolly-Seber method. Direct effects of food availability and rainfall were related to female reproductive activity and survival rate. Path analyses were used to describe quantitatively the hypothesized causal relations among the variables. N. squamipes reproduced seasonally, and 0. intermnedius, T. iheringi, and A. cursor reproduced all year with peaks during the rainy season. Species responded differently to the environmental factors; however, food availability seems to be the main factor determining reproduction. Abundance of rains appears to diminish survival rate of 0. intermnedius. Survival rate of N. squamipes increases with increases in fruit availability. Small mammals of the Neotropical forest can reproduce throughout the year or have distinct breeding periods (Lacher, 1992). For those species that breed seasonally, many studies have shown the relationships between reproduction and weather (Bergal-Journal of Mammalogy, 80(2):472-486, 1999 472

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supporting

confidence: 91%

Effects of Climate and Food Availability on Four Rodent Species in Southeastern Brazil

Bergallo

Magnusson

1999

Journal of Mammalogy

129

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“…The reproduction of marsupials is usually linked to specific factors (e.g. photoperiod) which induce hormonal stimuli, independent of how good the environmental conditions in each particular year are (Bergallo & Cerqueira 1994, Cerqueira & Bergallo 1993, Rigueira et al 1987, Tyndale-Biscoe & Renfreé 1987. This could explain why the reproductive seasons were similar in all years.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2001

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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.

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“…In such areas, it would be expected that mammal reproduction was related to weather. However, there are few studies on the factors that affect reproductive cycles of Neotropical marsupials (Tyndale-Biscoe & Mackenzie, 1976;Streilein, 1982a;Cerqueira, 1984;Rigueira et a!., 1987).…”

Section: Introductionmentioning

confidence: 99%

Reproduction and growth of the opossum Monodelphis domestica (Mammalia: Didelphidae) in northeastern Brazil

Bergallo

Cerqueira

1994

Journal of Zoology

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The reproduction and growth of the grey short‐tailed opossum, Monodelphis domestica were studied at seven localities in semi‐arid northeastern Brazil. Data were gathered from 1031 specimens stored in the Museu National do Rio de Janeiro. The data allowed us to determine the degree of sexual dimorphism, number of embryos, the relationship between post‐partum development and reproduction, and the breeding season. Adult M. domestica have marked sexual dimorphism, but juveniles do not. Females reduce growth when they attain puberty and produce their first litter. However, growth of males is not interrupted during their first reproductive season. This may reflect differences in reproductive investment between sexes. The mean number of embryos was 7–9 with a range from 2 to 16. The species reproduces seasonally probably in response to variation in day length.

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Algumas observações sobre o ciclo reprodutivo anual de fêmeas do gambá Didelphis albiventris (Lund, 1841) (Marsupialia, Didelphidae) em populações naturais no Estado de Minas Gerais, Brasil

Cited by 13 publications

References 4 publications

Effects of Climate and Food Availability on Four Rodent Species in Southeastern Brazil

Effects of Climate and Food Availability on Four Rodent Species in Southeastern Brazil

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

Reproduction and growth of the opossum Monodelphis domestica (Mammalia: Didelphidae) in northeastern Brazil

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