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Mammalian Biology

, Volume 69, Issue 5, pp 319–336 | Cite as

Ecology of a community of mammals in a seasonally dry forest in Roraima, Brazilian Amazon

  • A. R.Mendes PontesEmail author
Original investigation

Abstract

A community of middle-sized and larger mammals was studied in a seasonally dry forest in the far north of the Brazilian Amazon. Diurnal and nocturnal surveys were carried out through the line-transect method, in 5 different forest types along a 10-km transect. Data were collected on density, biomass, and use of the forest types, and forest strata by the mammals. The terrestrial community of mammals was more abundant than the arboreal one, with ungulates contributing to the bulk of the biomass, as a result of Maracäbeing highly seasonal. Overall densities were lower than in other sites in the neotropics, varying from 90.2 ind/km2 in mixed forest, to 159.9 ind/km2 in Terra Firme forest, whereas biomass, due to the contribution of large mammals, was much higher (2 613.2 kg/km2 in mixed forest, and 4 351.6 kg/km2 in Terra Firme forest). This study confirms that the animals surviving in larger numbers in these highly seasonal forests, where food productivity may be very low during the dry season, are those that have larger home ranges and travel longer distances in search of food.

Key words

Mammalian community density biomass Amazon 

Ökologie einer Säugetiergemeinschaft eines saisonal trockenen Waldes in Roraima, brasilianisches Amazonien

Zusammenfassung

Eine Gemeinschaft mittelgroßer und großer Säugetiere eines saisonal trockenen Waldes im Norden Amazoniens wurde untersucht. Mittels der Linien-Transekt-Methode längs eines 10 km langen Transektes wurden in 5 verschiedenen Waldtypen die tag- sowie die nachtaktiven Säugetiere aufgenommen. Die Geländedaten hinsichtlich der Säugetierdichte, -biomasse, sowie der Nutzung der Waldtypen und seiner Schichten durch die Säugetiere wurden erfaßt. Die Tiere der terrestrischen Säugetiergemeinschaft waren häufiger als die der Baumschicht. Dabei trugen insbesondere die Ungulaten zur Biomasse bei, da Maracähochsaisonal ist. Die Tierdichten waren im allgemeinen niedriger als an anderen Stellen der Neotropen und variierten von 90,2 Individuen/km2 im Mischwald bis zu 159,9 Individuen/km2 in Terra Firme-Wäldern. Im Gegensatz hierzu war jedoch die Säugetier-Biomasse im Mischwald viel höher (2 613,2 kg/km2 im Mischwald, 4 351,6 kg/km2 im Terra Firme-Wald). Die Untersuchung zeigte, daßin den hoch saisonalen Wäldern, in denen die Nahrungsproduktion während der Trockenperiode sehr niedrig sein kann, Tiere mit großem Aktivitätsradius begünstigt sind und in größerer Zahl auftraten.

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Copyright information

© Deutsche Gesellschaft für Säugetierkunde 2004

Authors and Affiliations

  1. 1.Department of Zoology, Biological Sciences CentreFederal University of PernambucoRecifeBrazil

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