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Seasonality, dung specificity and competition in dung beetle assemblages in the Australian Wet Tropics, north-eastern Australia

Published online by Cambridge University Press:  10 January 2005

Karl Vernes
Affiliation:
Ecosystem Management, The University of New England, Armidale, New South Wales 2351, Australia
Lisa C. Pope
Affiliation:
Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
Christopher J. Hill
Affiliation:
Environment Protection Agency, P.O. Box 731 Toowoomba, Queensland 4350, Australia
Felix Bärlocher
Affiliation:
Department of Biology, Mount Allison University, Sackville, New Brunswick E4L 1G7, Canada

Abstract

A trapping study of five mammal species in wet sclerophyll forest adjacent to rain forest in the Australian Wet Tropics was used to examine the seasonal diversity, abundance and dung-specificity of dung beetles associated with mammal dung. A total of 542 dung beetles from 11 species within three genera was recovered from beneath the traps of 1104 mammal captures. The diversity of beetles associated with the dung of the northern bettong (Bettongia tropica), a mycophagous marsupial, differed significantly from the diversity predicted by a null model. Numbers of beetles varied significantly with type of dung, indicating preference by beetles. Beetle numbers were related positively to a 1-mo lag in monthly mean minimum temperature and less strongly to maximum temperature and rainfall. Significantly more beetles per mammal capture were detected in the wet season than in the dry season. Dung beetles showed a strong preference for either the Eucalyptus woodland (six species) or the adjacent Allocasuarina forest (four species), with only one species occurring in both habitat types. Beetle species from the Eucalyptus woodland were typically only detected in the late wet and early dry seasons, while species in the wetter Allocasuarina forest were generally collected during the late dry and early wet seasons. A significant ‘checkerboard’ species effect was detected in both time and space in both habitat types, suggesting that competition for dung was strong.

Type
Research Article
Copyright
2005 Cambridge University Press

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