ORCID Profile
0000-0002-8690-761X
Current Organisations
Directorate of Natural Resources
,
University of Tasmania
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Publisher: Inter-Research Science Center
Date: 31-05-2017
DOI: 10.3354/MEPS12140
Publisher: National Shellfisheries Association
Date: 08-2013
DOI: 10.2983/035.032.0212
Publisher: Public Library of Science (PLoS)
Date: 04-08-2014
Publisher: Elsevier
Date: 2014
Publisher: Wiley
Date: 05-2010
Publisher: Informa UK Limited
Date: 06-12-2019
Publisher: CSIRO Publishing
Date: 2015
DOI: 10.1071/MF14126
Abstract: To persist in the face of environmental change, species must adjust to the new conditions or change their geographical distribution, e.g. by range extension. Success for in iduals within a zone of range extension requires the new environment to support their capacity to produce viable gametes and survival of the offspring. Reproductive characteristics of the polewards range-shifting Octopus tetricus were examined within the new range off north-eastern Tasmania, Australia, to assess whether it is likely to successfully establish in this extended area of its range. Approximately 44% of captured males and 14% of captured females were mature. Mature females with developing eggs were found throughout the year. Greater numbers of mature females were observed during the austral summer and spring, whereas mature males were observed all year round. Fecundity was high and developing embryos appeared to be viable. Our results suggest that O. tetricus is successfully reproducing beyond its historical range, the reproductive cycle is timed to favourable environmental conditions, and the population has the potential to be self-sustainable. The reproductive biology of O. tetricus may thus facilitate the establishment and prevalence of the population into new environments beyond the known historical distribution.
Publisher: Wiley
Date: 18-10-2019
DOI: 10.1111/AEC.12726
Publisher: Elsevier BV
Date: 07-2010
Publisher: Inter-Research Science Center
Date: 24-08-2023
DOI: 10.3354/MEPS14372
Abstract: The common Sydney octopus Octopus tetricus has undergone range extension along the east coast of Australia, associated with regional warming and the strengthening and southward extension of the East Australian Current (EAC). Its historical range of distribution is from southern Queensland to southern New South Wales, but it is now also found off north-east Tasmania, where it may affect local ecosystem dynamics due to changes in trophic interactions. This study aims to identify the prey and trophic level of O. tetricus from specimens collected off Tasmania to anticipate potential ecological, economic, and conservation effects in the range-extended area. The stomach contents of 18 O. tetricus in iduals captured off north-east Tasmania in 2011 were characterised using DNA metabarcoding. Sixteen families of prey were identified crustaceans (Alpheidae, Calcinidae, Diogenidae, and Galatheidae) were the most frequently detected prey, followed by fishes and bivalves. Prey species of commercial importance included blue-throated wrasse Notolabrus tetricus and the scallop Pecten fumatus . O. tetricus was found to have an intermediate trophic level of 3.66, participating in the transfer of energy from lower to upper trophic levels. Predation by O. tetricus could present competition to local fishers for resources and additional pressure on local fishery stocks, and may alter estimates of natural mortality used by fisheries management. The present study may be useful to scientists, fishery managers, and conservationists because it provides a preliminary assessment of the diet of O. tetricus , with potential ecological, economic, and conservation implications in the range-extended area.
Publisher: Wiley
Date: 10-01-2022
DOI: 10.1111/GCB.15404
Location: Falkland Islands (Malvinas)
Location: United States of America
No related grants have been discovered for Jorge E Ramos.