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Resident lobsters dominate food competition with range-shifting lobsters in an ocean warming hotspot

Citation

Twiname, S and Fitzgibbon, QP and Hobday, AJ and Carter, CG and Oellermann, M and Pecl, GT, Resident lobsters dominate food competition with range-shifting lobsters in an ocean warming hotspot, Marine Ecology Progress Series, 685 pp. 171-181. ISSN 0171-8630 (2022) [Refereed Article]


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Copyright Statement

Copyright 2022 The Author(s) Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3354/meps13984

Abstract

Species redistributions are one of the most prevalent changes observed in oceans worldwide due to climate change. One of the major challenges is being able to predict temperature-driven changes to species interactions and the outcome of these changes for marine communities due to the complex nature of indirect effects. In the ocean-warming hotspot of south-east Australia, the ranges of many species have shifted poleward. The range of the eastern rock lobster Sagmariasus verreauxi has extended into warming Tasmanian waters inhabited by the resident southern rock lobster Jasus edwardsii, which may lead to increased competitive interactions between the species. Using video monitoring, we investigated how the 2 species compete for food at current (18C), future (21C) and future heatwave (24C) summer temperatures. Behavioural competition occurred in 80% of experiments, during which J. edwardsii won 84% of competitive interactions and showed more aggressive behaviour at all temperatures. This indicates that resident J. edwardsii is not only more dominant in direct food competition than the range-shifting S. verreauxi but, surprisingly, also sustains competitive dominance beyond its physiological thermal optimum under predicted future ocean warming and heatwave scenarios.

Item Details

Item Type:Refereed Article
Keywords:climate change ecology, interspecific competition, novel species interactions, range shifts, spiny lobsters, thermal performance
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fish physiology and genetics
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught rock lobster
UTAS Author:Twiname, S (Ms Samantha Twiname)
UTAS Author:Fitzgibbon, QP (Associate Professor Quinn Fitzgibbon)
UTAS Author:Carter, CG (Professor Chris Carter)
UTAS Author:Oellermann, M (Dr Michael Oellermann)
UTAS Author:Pecl, GT (Professor Gretta Pecl)
ID Code:149453
Year Published:2022
Web of Science® Times Cited:1
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2022-03-31
Last Modified:2022-04-22
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