Population ecology of small rodents and marsupials in a semi-deciduous tropical forest of the southeast Pantanal, Brazil

Andreazzi, Cecilia S.; Rademaker, Vitor; Gentile, Rosana; Herrera, Heitor Miraglia; Jansen, Ana Maria; D’Andrea, Paulo Sérgio

doi:10.1590/s1984-46702011000600009

Cited by 23 publications

(6 citation statements)

References 21 publications

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“…Its diet is composed mainly of insects, although fruits may act as an important food source during the dry season, especially for reproductive females (Lamberto 2011;Camargo et al 2014). Reproduction is usually synchronized among individuals and a biased sex-ratio toward males has already been reported in previous populations (Aragona and Marinho-Filho 2009;Andreazzi et al 2011). Because the adoption of this extreme reproductive strategy may vary among populations of the same species (Lorini et al 1994;Mills and Bencini 2000;Oakwood et al 2001), the aim of this paper is to describe the population dynamics of G. agilis in a Brazilian area of cerrado, with special emphasis on its reproductive mode and associated life-history traits.…”

Section: Introductionmentioning

confidence: 99%

Semelparity in a population of Gracilinanus agilis (Didelphimorphia: Didelphidae) inhabiting the Brazilian cerrado

Lopes¹,

Leiner²

2015

Mammalian Biology

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a b s t r a c tAlthough reproducing once in a lifetime (i.e. semelparity) is considered rare among vertebrates, it has evolved at least five times in two distantly related marsupial families; the Australian Dasyuridae and South American Didelphidae. The major aim of this research was to describe the population dynamics, reproductive strategy and associated life-history traits of the agile gracile mouse opossum, Gracilinanus agilis, in order to position the species along the fast-slow life-history continuum. Sampling was carried out through mark-recapture, from August 2010 to April 2013, in a Brazilian area of cerrado. Reproductive activity was seasonal and synchronized among females, and occurred from July to January/February. After mating, population size decreased due to male disappearance, which seems to be explained by postmating male die-off. Phylogenetic predisposition toward semelparity in Gracilinanus lineage and intense competition for females may contribute to male die-off, as indicated by several evidences such as malebiased sex ratio, signs of aggression in reproductive males, and a pronounced gain in male body mass and size prior to mating. Although two litters were produced, most females disappeared after weaning their young, indicating post-reproductive senescence and resulting in discrete, non-overlapping generations, characterizing semelparity in this population of G. agilis.

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Section: Introductionmentioning

confidence: 99%

Semelparity in a population of Gracilinanus agilis (Didelphimorphia: Didelphidae) inhabiting the Brazilian cerrado

Lopes¹,

Leiner²

2015

Mammalian Biology

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“…A study carried out in the Pantanal biome indicated that the congener species G. agillis had significantly more captures in trees than on the ground (Andreazzi et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Community structure and population dynamics of small mammals in an urban-sylvatic interface area in Rio de Janeiro, Brazil

Gentile¹,

Cardoso²,

Costa-Neto³

et al. 2018

Zoologia

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ABSTRACT. The Atlantic Forest is one of the most disturbed Brazilian biomes, with 183 out of 298 species of mammals occurring in the state of Rio de Janeiro. In this study, we aimed to characterize the diversity, community structure, and habitat use of small mammals in the FIOCRUZ Atlantic Forest Campus (CFMA), including areas of Pedra Branca State Park (PBSP, subunit Pau da Fome), state of Rio de Janeiro. We also compared species diversity and composition between two moments 15 years apart (2001 and 2012-2015) and analyzed the population dynamics of the marsupial Didelphis aurita (Wied-Neuwied, 1826). Small mammal captures were made in different habitats: sylvatic-urban interface areas near human dwellings, disturbed forest, and preserved forest areas. Five marsupial species and four rodent species were captured in both periods. There was a reduction in species richness and β diversity between the two periods, indicating that disturbances in the environment over the years may have affected the small mammal community structure. The most altered environment showed the greatest species richness and abundance, while the forest areas showed the smallest values, which may be explained by the loss of mammal species, mainly specialist species in forested areas. We identified three groups of species according to habitat preferences: one related to environments with a higher density of vegetation in upper strata -Marmosa paraguayana (Tate, 1931) and Monodelphis americana (Müller, 1776), another related to a higher density in lower forest strata -Akodon cursor (Winge, 1887), and another with no association with the investigated habitat variables -D. aurita and Oligoryzomys nigripes (Olfers, 1818). The small mammal community structure showed a low level of nestedness in both sampling periods. This study is the first report to evaluate the community structure of small mammals in the sylvatic-urban interface area of Pedra Branca State Park, the largest forest reserve within an urban area in Brazil. The surveys indicate that the small mammal diversity was low in both sampling periods and in both areas, and a species loss in the Pau da Fome locality was observed, despite it is a conservation unit. The greater species abundance and richness in the most disturbed areas suggest an increase of factors favoring the occurrence of synanthropic and opportunistic species.

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“…Its diet is composed of fruits, invertebrates and small vertebrates (Bocchiglieri et al, 2010;Camargo et al, 2014). It is sexually dimorphic in size (females = 13-25 g, males = 15-40 g; Costa et al, 2003) and has a synchronized reproduction from the end of the dry season (August-September) until the adult population reduction (December-January) (Aragona and Marinho-Filho, 2009;Andreazzi et al, 2011), as observed in the study area (Mendonça et al, 2015). Populations of this species may have semelparous (Lopes and Leiner, 2015;Puida and Paglia, 2015) or partially semelparous (Martins et al, 2006) reproductive strategies.…”

Section: Natural Historymentioning

confidence: 99%

The impact of botfly parasitism on the health of the gracile mouse opossum (Gracilinanus agilis)

et al. 2019

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Fragmented habitats generally harbour small populations that are potentially more prone to local extinctions caused by biotic factors such as parasites. We evaluated the effects of botflies (Cuterebra apicalis) on naturally fragmented populations of the gracile mouse opossum (Gracilinanus agilis). We examined how sex, food supplementation experiment, season and daily climatic variables affected body condition and haemoglobin concentration in animals that were parasitized or not by botflies. Although parasitism did not affect body condition, haemoglobin concentrations were lower in parasitized animals. Among the non-parasitized individuals, haemoglobin concentration increased with the increase of maximum temperature and the decrease of relative humidity, a climatic pattern found at the peak of the dry season. However, among parasitized animals, the opposite relationship between haemoglobin concentration and relative humidity occurred, as a consequence of parasite-induced anaemia interacting with dehydration as an additional stressor. We conclude that it is critical to assess how climate affects animal health (through blood parameters) to understand the population consequences of parasitism on the survival of individuals and hence of small population viability.

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Population ecology of small rodents and marsupials in a semi-deciduous tropical forest of the southeast Pantanal, Brazil

Cited by 23 publications

References 21 publications

Semelparity in a population of Gracilinanus agilis (Didelphimorphia: Didelphidae) inhabiting the Brazilian cerrado

Semelparity in a population of Gracilinanus agilis (Didelphimorphia: Didelphidae) inhabiting the Brazilian cerrado

Community structure and population dynamics of small mammals in an urban-sylvatic interface area in Rio de Janeiro, Brazil

The impact of botfly parasitism on the health of the gracile mouse opossum (Gracilinanus agilis)

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