[MARMAM] New publication: Abundance, survival and temporary emigration of bottlenose dolphins off Useless Loop in the western gulf of Shark Bay

Krista Nicholson krista.e.nicholson at gmail.com
Tue Nov 27 08:17:17 PST 2012


 Dear Colleagues,

My co-authors and I are pleased to announce that a new publication is now
available:

Nicholson, K., Bejder, L., Allen, S.J., Kruetzen, M. and Pollock, K.H.
(2012). Abundance, survival and temporary emigration of bottlenose dolphins
(Tursiops sp.) off Useless Loop in the western gulf of Shark Bay, Western
Australia.  Marine and Freshwater Research, 2012, 63, 1059–1068.

*Abstract.* Capture–recapture models were used to provide estimates of
abundance, apparent survival and temporary emigration of Indo-Pacific
bottlenose dolphins (Tursiops sp.) in a 226-km2 study area off Useless Loop
in the western gulf of Shark Bay, Western Australia. Photo-identification
data were collected during boat-based surveys in Austral autumn to early
spring (April–September) from 2007 to 2011. Abundance estimates varied from
115 (s.e. 5.2, 95% CI 105–126) individuals in 2008 to 208 (s.e. 17.3, 95%
CI 177–245) individuals in 2010. The variability in abundance estimates is
likely to be a reflection of how individuals used the study area, rather
than fluctuations in true population size. The best fitting
capture–recapture model suggested a random temporary emigration pattern
and, when coupled with relatively high temporary emigration rates (0.33
(s.e. 0.07) – 0.66 (s.e. 0.05)) indicated that the study area did not cover
the entire ranges of the photo-identified dolphins. Apparent survival rate
is a product of true survival and permanent emigration and was estimated
annually at 0.95 (s.e. 0.02). Since permanent emigration from the study
area is unlikely, true survival was estimated to be close to 0.95. This
study provides a robust baseline for future comparisons of dolphin
demographics, which may be of importance should climate change or
increasing anthropogenic activity affect this population.

*Additional keywords:* capture-recapture, demographic parameters,
photo-identification, Pollock’s closed robust design.

You can download the PDF through the Marine and Freshwater Research journal
website:

www.publish.csiro.au/paper/MF12210.htm

Should you have any enquiries or questions don't hesitate to contact me at
krista.e.nicholson at gmail.com

All the best,

Krista Nicholson

Murdoch University Cetacean Research Unit

Centre for Fish, Fisheries and Aquatic Ecosystems Research

Murdoch University, Western Australia

Murdoch, WA 6150, Australia



http://mucru.org/
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