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Latitudinal, ontogenetic, and historical shifts in the diet of a carnivorous teleost, Arripis trutta, in a coastal pelagic ecosystem altered by climate change

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Hughes, JM and Stewart, J and Lyle, JM and McAllister, J and Suthers, IM (2013) Latitudinal, ontogenetic, and historical shifts in the diet of a carnivorous teleost, Arripis trutta, in a coastal pelagic ecosystem altered by climate change. Latitudinal, ontogenetic, and historical shifts in the diet of a carnivorous teleost, Arripis trutta, in a coastal pelagic ecosystem altered by climate change, 70. pp. 1209-1230. ISSN 0706-652X

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Abstract

Changes to the global climate are driving alterations to boundary current-influenced marine ecosystems. The diet of
a pelagic teleost, Arripis trutta, was examined in the East Australian Current (EAC)-dominated coastal waters of southeastern (SE)
Australia. The diet of A. trutta was dominated by pelagic baitfish, primarily Australian sardine (Sardinops sagax) and scads
(Trachurus spp.). Diet varied substantially with both latitude and season linked to variability in the distribution and abundance
of key prey species. An ontogenetic diet shift occurred, with crustaceans and polychaetes making up a large proportion of the
diet of small fish compared with the dominance of baitfish at larger sizes. The diet of A. trutta has undergone a dramatic shift
from one dominated by krill (Nyctiphanes australis) historically to baitfish today. This change is consistent with a well-documented
regime shift caused by the increasing intensity of the EAC on coastal SE Australian waters. Understanding the temporal dynamics
of this ecosystem is crucial for management of coastal fisheries and also for understanding the impacts of climate change on
boundary current-dominated marine ecosystems worldwide.

Item Type: Article
Journal or Publication Title: Latitudinal, ontogenetic, and historical shifts in the diet of a carnivorous teleost, Arripis trutta, in a coastal pelagic ecosystem altered by climate change
Page Range: pp. 1209-1230
ISSN: 0706-652X
Identification Number - DOI: doi.org/10.1139/cjfas-2013-0083
Additional Information:

Copyright 2013 NRC Research Press

Date Deposited: 06 Oct 2013 22:03
Last Modified: 18 Nov 2014 04:55
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