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Stomach content analysis of mesopelagic fish from the southern Kerguelen Axis

Citation

Riaz, J and Walters, A and Trebilco, R and Bestley, S and Lea, M-A, Stomach content analysis of mesopelagic fish from the southern Kerguelen Axis, Deep-Sea Research. Part 2 pp. 1-15. ISSN 0967-0645 (2019) [Refereed Article]


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Copyright Statement

Copyright 2019 Elsevier

DOI: doi:10.1016/j.dsr2.2019.104659

Abstract

Mesopelagic fish represent an important trophic link between zooplankton and higher order predators in Southern Ocean food webs. Information on their feeding habits is still sparse, representing a key area of uncertainty in efforts to understand and model Southern Ocean food web dynamics. We used visual assessment of stomach contents to characterise the diets of three myctophids (Electrona antarctica, Gymnoscopelus braueri, Krefftichthys anderssoni) and one bathylagid (Bathylagus antarcticus) over the southern extension of the Kerguelen Plateau (‘southern Kerguelen Axis’), a highly productive area of both biological and economic importance in the Indian sector of the Southern Ocean. Diets of all four species were dominated by euphausiids, amphipods, copepods and fish. Bathylagus antarcticus also preyed upon a high proportion of soft-bodied organisms. There was strong evidence for dietary variability both within and between species, and this variability was driven by latitudinal variation in zooplankton assemblages. Size-based shifts in diet were apparent, with larger individuals of myctophid and bathylagid species consuming larger prey. Linear mixed effects models also demonstrated that the weight of prey consumed increased in relation to predator weight. Dietary information presented here advances our understanding of the mesopelagic components of Southern Ocean food webs, which will improve the development of food web models for the region.

Item Details

Item Type:Refereed Article
Keywords:pelagic food webs, Southern Ocean, Kerguelen, mesopelagic, fish trawl, lanternfishes, myctophid, bathylagid, foraging ecology
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Antarctic and Sub-Antarctic Environments
UTAS Author:Riaz, J (Mr Javed Riaz)
UTAS Author:Walters, A (Dr Andrea Walters)
UTAS Author:Trebilco, R (Dr Rowan Trebilco)
UTAS Author:Bestley, S (Dr Sophie Bestley)
UTAS Author:Lea, M-A (Associate Professor Mary-Anne Lea)
ID Code:135310
Year Published:2019
Deposited By:Ecology and Biodiversity
Deposited On:2019-10-11
Last Modified:2020-03-04
Downloads:22 View Download Statistics

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