[MARMAM] New publication on management units of short-beaked common dolphins off southern and southeastern Australia

Kerstin Bilgmann kerstin.bilgmann at mq.edu.au
Fri Mar 28 19:03:09 PDT 2014


Dear all,

We are happy to announce our most recent publication in MEPS:

Multiple management units of short-beaked common dolphins subject to
fisheries bycatch off southern and southeastern Australia.

Kerstin Bilgmann,*, Guido J. Parra, Nikki Zanardo, Luciano B. Beheregaray,
Luciana M. Moller

*Corresponding author: kerstin.bilgmann at flinders.edu.au

ABSTRACT: Worldwide, fisheries bycatch remains one of the greatest
immediate threats to cetacean populations. In Australia, short-beaked
common dolphins are subject to bycatch mortality in 2 fisheries: the
purse-seine fishery for sardines off central South Australia and the
gillnet fishery for gummy sharks off southern Australia. The cumulative
impact of bycatch from both fisheries on the dolphin population(s) in these
regions are unknown. We used information from microsatellite markers and
mitochondrial DNA to investigate population genetic structure and estimate
contemporary migration rates in 332 biopsied and 15 stranded samples of
common dolphins. Samples were collected from 11 locations along ~3500 km of
coastline in southern and southeastern Australia. Bayesian and traditional
analyses of population genetic structure revealed the presence of at least
6 management units of common dolphins, of which a minimum of 3 are
potentially impacted by the 2 fisheries. These management units need to be
managed separately for conservation purposes and for monitoring and
mitigation of common dolphin fishery interactions off southern and
southeastern Australia. We suggest that substructuring and
migratory movements of common dolphins across these regions may be driven
by spatial variations in oceanography, upwelling events and/or fish
distribution. This study exemplifies how information on genetic
substructuring in a neritic top predator can be valuable for fisheries
bycatch management.

KEY WORDS: Fine-scale structure · Genetic structure · Gillnet · Purse seine
· Oceanography · *Delphinus delphis*
The pdf of the article can be accessed at
http://www.int-res.com/abstracts/meps/v500/p265-279/

or by sending an email to kerstin.bilgmann at flinders.edu.au


Kind regards,

Kerstin

-- 
Dr Kerstin Bilgmann
Postdoctoral Research Fellow
School of Biological Sciences
Flinders University
GPO Box 2100 Adelaide   SA 5001 Australia
&
Honorary Associate
Marine Predator Research Group
Department of Biological Sciences
Faculty of Science
Macquarie University
Sydney NSW 2109 Australia
Email: kerstin.bilgmann at mq.edu.au
Ph: +61 (0) 409134460
Fax: +61 (0) 08 8201 3015
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