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The structure of a micro-bat community in relation to gradients of environmental variation in a tropical urban area

Citation

Hourigan, CL and Johnson, CN and Robson, SKA, The structure of a micro-bat community in relation to gradients of environmental variation in a tropical urban area, Urban Ecosystems, 9, (2) pp. 67-82. ISSN 1083-8155 (2006) [Refereed Article]


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The final publication is available at http://www.springerlink.com

Official URL: http://www.springerlink.com/content/m3092l2n01h062...

DOI: doi:10.1007/s11252-006-7902-4

Abstract

We investigated patterns of community structure (species composition, foraging activity, and nightly foraging patterns) of bats in relation to gradients of environmental variation in a tropical urban area. A total of 32 sites spread equally across eight habitat types were sampled in the city of Townsville, North Queensland, Australia. Each site was sampled on 3 non-consecutive occasions using automated AnaBat systems. Eleven species were confidently identified while a possible four more were identified only to the genus level. Ordination of environmental variables measured at these sites identified two distinct environmental gradients reflecting the degree of urbanisation and foliage density. With in- creasing urbanisation there was a decline in species richness and total foraging activity. We used regression trees to characterise foraging preferences of each species. This analysis sug- gested that only one species of Mormopterus was able to exploit the resources provided by urbanisation. This species foraged in areas with higher numbers of white streetlights. The remaining species of bats preferred to forage within close proximity to natural vegetation and with low numbers of streetlights. The density of vegetation in long-established suburbs did not substantially reverse the trend for urban areas to have fewer bat species than original habitats.

Item Details

Item Type:Refereed Article
Keywords:Micro-bat - Tropical urban gradient - Foraging patterns - Species composition - Community structure
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Community Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Urban and Industrial Flora, Fauna and Biodiversity
Author:Johnson, CN (Professor Christopher Johnson)
ID Code:68657
Year Published:2006
Deposited By:Zoology
Deposited On:2011-03-17
Last Modified:2011-05-26
Downloads:6 View Download Statistics

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