Patterns of connectivity and population structure of the southern calamary Sepioteuthis australis in southern Australia

Smith, Timothy M., Green, Corey P. and Sherman, Craig D. H. 2015, Patterns of connectivity and population structure of the southern calamary Sepioteuthis australis in southern Australia, Marine and freshwater research, vol. 66, no. 10, pp. 942-947, doi: 10.1071/MF14328.

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Title Patterns of connectivity and population structure of the southern calamary Sepioteuthis australis in southern Australia
Author(s) Smith, Timothy M.ORCID iD for Smith, Timothy M.
Green, Corey P.
Sherman, Craig D. H.ORCID iD for Sherman, Craig D. H.
Journal name Marine and freshwater research
Volume number 66
Issue number 10
Start page 942
End page 947
Total pages 6
Publisher CSIRO Publishing
Place of publication Clayton, Vic.
Publication date 2015-03-19
ISSN 1323-1650
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Physical Sciences
Marine & Freshwater Biology
null alleles
population resilience
Summary The southern calamary, Sepioteuthis australis, is a commercially and recreationally important inshore cephalopod endemic to southern Australia and New Zealand. Typical of other cephalopods, S. australis has a short life span, form nearshore spawning aggregations and undergo direct development. Such life history traits may restrict connectivity between spawning grounds creating highly structured and genetically differentiated populations that are susceptible to population crashes. Here we use seven polymorphic microsatellite markers to assess connectivity and population structure of S. australis across a large part of its geographic range in Australia. Little genetic differentiation was found between sampling locations. Overall, FST was low (0.005, 95% CI≤<0.001-0.011) and we detected no significant genetic differentiation between any of the locations sampled. There was no strong relationship between genetic and geographical distance, and our neighbour joining analysis did not show clustering of clades based on geographical locations. Similarly, network analysis showed strong connectivity amongst most locations, in particular, Tasmania appears to be well connected with several other locations and may act as an important source population. High levels of gene flow and connectivity between S. australis sampling sites across Australia are important for this short-lived species, ensuring resilience against spatial and temporal mortality fluctuations.
Language eng
DOI 10.1071/MF14328
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
060207 Population Ecology
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, CSIRO Publishing
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