Contrasting intraspecific dietary shifts in two terapontid assemblages from Australia's wet-dry tropics

Davis, Aaron M., Pusey, Bradley J., and Pearson, Richard G. (2012) Contrasting intraspecific dietary shifts in two terapontid assemblages from Australia's wet-dry tropics. Ecology of Freshwater Fish, 21 (1). pp. 42-56.

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Abstract

This study assessed the size-related patterns of dietary resource use in terapontid assemblages from two north Australian wet-dry tropical river systems exhibiting contrasting long-term flow regimes. Substantially higher size-related dietary divergence in the form of additional trophic guilds and lower levels of dietary overlap were evident among terapontids from the comparatively stable Daly River system, particularly during the dry season. Relatively restricted expression of size-related dietary shifts in conjunction with higher levels of dietary overlap and no significant seasonal effects on dietary overlap were features of assemblage interaction in the highly variable Burdekin River. Results highlight size-related dietary shifts as a complex aspect of terapontid trophic habits, and one that can exhibit considerable spatial dynamism.

Item ID: 22113
Item Type: Article (Refereed Research - C1)
Keywords: flow regime; size-related feeding; ontogenetic niche; seasonal overlap; trophic guilds
ISSN: 1600-0633
Date Deposited: 28 Jun 2012 16:12
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060202 Community Ecology (excl Invasive Species Ecology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity @ 100%
Citation Count from Web of Science Web of Science 2
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