The Open Biology Journal




ISSN: 1874-1967 ― Volume 7, 2019

Environmental Assessment at the Bakhuis Bauxite Concession: Small- Sized Mammal Diversity and Abundance in the Lowland Humid Forests of Suriname


The Open Biology Journal , 2009, 2: 42-53

Burton K. Lim

Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada.

Electronic publication date 11/6/2009
[DOI: 10.2174/1874196700902010042]

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Abstract:

A small mammal survey was conducted in the Bakhuis Mountains of western Suriname in South America as part of a larger environmental and social impact assessment for a proposed bauxite mining concession. The objectives were to establish a baseline study of species diversity and relative abundance for comparison of seasonality, areas, and habitats to facilitate the identification and monitoring of potential impacts of mining to the environment. There were 83 species of small mammals documented comprising 68 species of bats, 8 species of rats and mice, and 7 species of opossums. The most abundant bat was the Seba’s short-tailed bat, Carollia perspicillata Linnaeus, which was recorded at all six study sites. The most abundant non-volant small mammal was the Guianan spiny rat, Proechimys guyannensis E. Geoffroy. Noteworthy discoveries during the survey include the documentation of four species of bats new to the fauna of Suriname (Cyttarops alecto Thomas, smoky sheath-tailed bat; Saccopteryx gymnura Thomas; least two-lined sac-winged bat; Diaemus youngi Jentink; bird-feeding vampire bat; and Lasiurus egregius Peters, greater red bat). There were no obvious differences between the dry and wet season samplings that were attributable directly to climatic conditions. In terms of spatial variation, the relative abundance of bats among the five study sites within the concession area was similar to each other, but significantly different from a sixth study site at a nearby ecotourism operation, which had large numbers of three species (C. perspicillata; Molossus molossus, common free-tailed bat; and Sturnira lilium, little yellowshouldered bat) that are better adapted to human modified surroundings. This suggests that the recent mining explorations in Bakhuis have had a relatively minor impact on bats and that the otherwise pristine forests within the concession can tolerate low levels of disturbance in proportionally small areas over a short duration. For specific habitats, the xeric forest on plateaus had a reduced subset of species of small mammals that were found in the mesic forest of the surrounding lowland regions, which was acting as a species reservoir for upland areas. Small mammals, in particular bats as primary seed dispersers and flower pollinators, are important components of the ecosystem for the successful reforestation of natural habitats, and factors related to community structure are good indicators of the health of the environment.


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