Small mammal community structure and microhabitat use in the austral boundary of the Atlantic Forest, Brazil

Daniela O De Lima,Nilton C Cáceres,Vagner L Camilotti,Bethânia O Azambuja

doi:10.1590/s1984-46702010000100015

Daniela O De Lima, Nilton C Cáceres + Show 2 more

Open Access

https://doi.org/10.1590/s1984-46702010000100015

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Abstract

We investigated the richness, composition, and species relative abundance of a terrestrial small mammal community in a Deciduous Forest area in the austral boundary of the Atlantic Forest. The microhabitat use of the most common species was also investigated. Six rodents - Akodon montensis (Thomas, 1913), Oligoryzomys nigripes (Olfers, 1818), Sooretamys angouya (Thomas, 1913), Thaptomys nigrita (Lichtenstein, 1829), Mus musculus (Linnaeus, 1758) and Juliomys sp. - and one marsupial - Didelphis albiventris (Lund, 1840) - were captured. Thaptomys nigrita is recorded in the state of Rio Grande do Sul for the first time. Species richness was poor when compared with communities in the central portions of the Atlantic Forest, but equivalent to that found in the Araucaria and Dense Ombrophilous forests of southern Brazil. The species most often captured in our study, A. montensis and O. nigripes, are also the most common in the majority of faunistic studies carried out in the Atlantic Forest. Akodon montensis and S. angouya used places with high abundance of bamboo, possibly to avoid predators. Oligorizomys nigripes used areas with a high density of scrubs, what could facilitate aboveground movements, and was negatively correlated to mature forest indicators, which reinforce the idea that this species has opportunistic habits.

Highlights

The Atlantic Forest, one of the most threatened biomes in the world, has a high mammalian diversity and endemism (MYERS et al 2000)
Species richness was poor when compared with communities in the central portions of the Atlantic Forest, but equivalent to that found in the Araucaria and Dense Ombrophilous forests of southern Brazil
The species most often captured in our study, A. montensis and O. nigripes, are the most common in the majority of faunistic studies carried out in the Atlantic Forest

Summary

Introduction

The Atlantic Forest, one of the most threatened biomes in the world, has a high mammalian diversity and endemism (MYERS et al 2000). Most studies carried out in the austral Atlantic Forest have recorded four to 10 species of small mammals (CADEMARTORI et al 2002, CÁCERES 2004, CHEREM 2005, DALMAGRO & VIEIRA 2005). BONVICINO et al 2002, DALMAGRO & VIEIRA 2005, PARDINI & UMETSU 2006, SCHEIBLER & CHRISTOFF 2007) This pattern is responsible for a sampling bias that results in generalist species being recorded from almost anywhere, whereas the recorded distribution of rarer species has many gaps. In the Araucaria Forest, DALMAGRO & VIEIRA (2005) found significant effects of microhabitat variables on species occurrence

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