Contrasting intraspecific dietary shifts in two terapontid assemblages from Australia’s wet‐dry tropics |
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| Authors: | Aaron M Davis Bradley J Pusey Richard G Pearson |
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| Institution: | 1. Australian Centre for Tropical Freshwater Research, James Cook University, Townsville, Queensland, Australia;2. Tropical Rivers and Coastal Knowledge, Australian Rivers Institute, Griffith University, Nathan, Queensland, Australia;3. School of Marine and Tropical Biology, James Cook University, Townsville, Queensland, Australia |
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| Abstract: | 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. |
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| Keywords: | flow regime size‐related feeding ontogenetic niche seasonal overlap trophic guilds |
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