Library Open Repository

Using stylet elemental signatures to determine the population structure of Octopus maorum

Downloads

Downloads per month over past year

Doubleday, ZA and Pecl, GT and Semmens, JM and Danyushevsky, LV (2008) Using stylet elemental signatures to determine the population structure of Octopus maorum. Marine Ecology Progress Series, 360. pp. 125-133. ISSN Print 0171-8630 Online 1616-1599

[img] PDF
offprint.pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Abstract

A novel method was used to investigate the population structure and dispersal patterns of Octopus maorum, an octopus species with a planktonic larval stage, which forms a distinct and large aggregation in southeast Tasmania. Single and multi-elemental signatures within the ‘early life history’ region of the stylet (an internal ‘shell’) were used to determine levels of connectivity and the common origins of individuals collected from 5 locations across Tasmania, South Australia and New Zealand. Using laser ablation inductively coupled plasma-mass spectrometry (LA ICPMS) the stylets were analysed for 12 elements, 8 of which were found to be excellent spatial discriminators. There was evidence of population structuring within the O. maorum population, with a distinct separation of the aggregation site in southeast Tasmania from other groups. Octopuses from the aggregation shared a common origin and appeared to be coming from a local neighbouring source. The 2 northern sample locations shared a similar elemental signature, which could be due to either similar water chemistries or long-distance dispersal. This study presents the first insights into the population structure of O. maorum, and provides vital information for the sustainable management of this species. Furthermore, this technique will have direct application to other more heavily fished octopus species around the world.

Item Type: Article
Journal or Publication Title: Marine Ecology Progress Series
Page Range: pp. 125-133
ISSN: Print 0171-8630 Online 1616-1599
Identification Number - DOI: 10.3354/meps07389
Date Deposited: 28 May 2008 00:55
Last Modified: 18 Nov 2014 03:41
URI: http://eprints.utas.edu.au/id/eprint/6580
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page