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Does sympatry affect trophic resource use in congeneric tidepool fishes? A tale of two gobies Favonigobius lentiginosus and Favonigobius exquisitus

Citation

Chargulaf, CA and Krueck, NC and Tibbetts, IR, Does sympatry affect trophic resource use in congeneric tidepool fishes? A tale of two gobies Favonigobius lentiginosus and Favonigobius exquisitus, Journal of Fish Biology, 79, (7) pp. 1968-1983. ISSN 0022-1112 (2011) [Refereed Article]

Copyright Statement

Copyright 2011 The Authors

DOI: doi:10.1111/j.1095-8649.2011.03132.x

Abstract

The feeding ecology of two sympatric gobies, Favonigobius lentiginosus and Favonigobius exquisitus, which inhabit soft substrate pools was studied in Moreton Bay, Australia. Favonigobius spp. and sediment cores were collected from three locations within the bay and fish gut contents were analysed to explore potential competition and ontogenetic dietary shifts. The most abundant prey at all sites was nematodes at 633 038 cm−3 at Dunwich, 3358 026 cm−3 at Manly and 636 0849 cm−3 (mean s.e.) at Godwin Beach. Nevertheless, they were not a dominant component of the diets. Volumetric percent contribution of prey showed that copepods and decapod shrimps dominated F. lentiginosus diets at Dunwich (78 and 66%, respectively) and Godwin Beach (65 and 143%, respectively) and the diets of F. exquisitus at Manly (92 and 95%, respectively) and Godwin Beach (104 and 118%, respectively). Schoener's index of dietary overlap between the two species, when sympatric, was 085 indicating a high similarity. An ontogenetic shift towards larger prey items occurred as Favonigobius spp. reached larger sizes. Gut fullness indices showed significant differences between time of day (two-way ANOVA, P < 001) and species (two-way ANOVA, P < 005) but Bonferroni's multiple comparison test showed that the only significant difference was between F. lentiginosus at Dunwich and F. exquisitus at Godwin Beach at 1800 hours. Food resource competition and temporal resource partitioning did not appear to be a limiting factor between F. lentiginosus and F. exquisitus despite cohabitation in such restricted environments.

Item Details

Item Type:Refereed Article
Keywords:marine ecology, fish biology, trophic ecology
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal or estuarine biodiversity
UTAS Author:Krueck, NC (Dr Nils Krueck)
ID Code:145754
Year Published:2011
Web of Science® Times Cited:7
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2021-08-04
Last Modified:2021-11-23
Downloads:0

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