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Body size, growth and life span: implications for the polewards range shift of Octopus tetricus in south-eastern Australia

Citation

Ramos, JE and Pecl, GT and Moltschaniwskyj, NA and Strugnell, JM and Leon, RI and Semmens, JM, Body size, growth and life span: implications for the polewards range shift of Octopus tetricus in south-eastern Australia, PLoS One, 9, (8) Article e103480. ISSN 1932-6203 (2014) [Refereed Article]


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Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.1371/journal.pone.0103480

Abstract

Understanding the response of any species to climate change can be challenging. However, in short-lived species the faster turnover of generations may facilitate the examination of responses associated with longer-term environmental change. Octopus tetricus, a commercially important species, has undergone a recent polewards range shift in the coastal waters of south-eastern Australia, thought to be associated with the southerly extension of the warm East Australian Current. At the cooler temperatures of a polewards distribution limit, growth of a species could be slower, potentially leading to a bigger body size and resulting in a slower population turnover, affecting population viability at the extreme of the distribution. Growth rates, body size, and life span of O. tetricus were examined at the leading edge of a polewards range shift in Tasmanian waters (40S and 147E) throughout 2011. Octopus tetricus had a relatively small body size and short lifespan of approximately 11 months that, despite cooler temperatures, would allow a high rate of population turnover and may facilitate the population increase necessary for successful establishment in the new extended area of the range. Temperature, food availability and gender appear to influence growth rate. Individuals that hatched during cooler and more productive conditions, but grew during warming conditions, exhibited faster growth rates and reached smaller body sizes than individuals that hatched into warmer waters but grew during cooling conditions. This study suggests that fast growth, small body size and associated rapid population turnover may facilitate the range shift of O. tetricus into Tasmanian waters.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Sciences not elsewhere classified
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Australia (excl. Social Impacts)
Author:Ramos, JE (Mr Jorge Ramos Castillejos)
Author:Pecl, GT (Associate Professor Gretta Pecl)
Author:Leon, RI (Mr Rafael Leon)
Author:Semmens, JM (Associate Professor Jayson Semmens)
ID Code:96431
Year Published:2014
Web of Science® Times Cited:8
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2014-11-05
Last Modified:2017-11-04
Downloads:366 View Download Statistics

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