Dietary guild structure in a demersal fish assemblage from the northeastern Tasmanian waters, Australia

Title
Dietary guild structure in a demersal fish assemblage from the northeastern Tasmanian waters, Australia
Author(s)
박주면; Vicent Raoult; Troy F. Gaston; Jane E. Williamson
Publication Year
2019-11-08
Abstract
Having more trophic niches in an ecosystem can support a greater diversity of sympatric species in marine systems by reducing inter-specific competition, which can increase the carrying capacity of ecosystems, the productivity of fisheries, and trophic stability. However, the scale and number of interactions of trophic niches that occur naturally within whole fish communities are less well understood. We examined the gut contents of 55 co-occurring species of fish from a benthic coastal environment of north-eastern Tasmania, Australia, to determine the number and width of trophic niches and their interactions. Stomach contents of most species suggest fishes were bottom-feeding carnivores that consumed mainly benthic crustaceans and mollusks, while 14 primarily piscivorous species were present. The results indicate that most fishes within this ecosystem fed on non-pelagic prey sources. Cluster analysis with SIMPROF test based on gravimetric contributions of different prey categories to the stomach contents revealed that there were three main feeding guilds divided into seven sub-guilds across all species. A use of cluster analysis and SIMPROF using ‘prey resemblance’ identified six prey guilds that each comprised similar ecological or functional roles. Predator and prey coupling guild analysis (i.e. shade plot) revealed how food resources are distributed with both predator and prey axis, indicating there is some pat
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/21070
Bibliographic Citation
Korean Federation of Fisheries Science and Technology Societies, 2019
Publisher
한국수산과학총연합회
Type
Conference
Publisher
한국수산과학총연합회
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