Oryx

Short Communications

Implications of faecal removal by dung beetles for scat surveys in a fragmented landscape of the Brazilian Amazon

Darren Norrisa1 c1 and Fernanda Michalskia2

a1 Av. Mariland 1367/1001, Porto Alegre, RS 90440-191, Brazil.

a2 Department of Ecology, Bioscience Institute, University of São Paulo, São Paulo, Brazil, and Instituto Pró-Carnívoros, Atibaia, São Paulo, Brazil.

Abstract

Monitoring rare and elusive species for effective management and conservation is particularly challenging and often demands the development of specialized techniques. Scat surveys have been applied to monitor a variety of rare species but relatively little attention has been given to the development of appropriate sampling designs. To determine if scat surveys could be applied to compare the distribution of species across three habitats of a fragmented region in the Brazilian Amazon, the removal of human (n = 27) and jaguar (n = 27) scat samples in forest, riparian corridor and pasture habitats was recorded for 24 hours. Dung beetles were responsible for removing the majority of samples (71%) and a generalized linear mixed effect model revealed significant influence of habitat and scat type on removal probability, with forest and riparian corridors having higher removal compared with samples in pasture habitats. Although non-invasive scat surveys can potentially address fundamental broad-scale conservation and management questions, our results demonstrate that scat surveys in the tropics must account for differences in scat removal rates between habitats and target species before conclusions can be drawn regarding patterns of habitat use.

(Received May 20 2009)

(Reviewed June 13 2009)

(Accepted June 17 2009)

Correspondence:

c1 Av. Mariland 1367/1001, Porto Alegre, RS 90440-191, Brazil. E-mail dnorris75@gmail.com

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