[MARMAM] New Publication: Nicholson et al. (2022) Demographics and viability of an estuarine community of Indo-Pacific bottlenose dolphins

Krista Nicholson krista.e.nicholson at gmail.com
Wed Sep 7 20:56:57 PDT 2022


Dear Colleagues,

I and my co-authors are excited to announce a new open access publication
that forms the third part of a dolphin population assessment in the
Peel-Harvey Estuary in Western Australia.

What is particularly neat about this study is that we were able to
obtain census level data for the community of dolphins with all
individuals' sex and approximate age being known.

*Title: *Demographics and viability of an estuarine community of
Indo-Pacific bottlenose dolphins

*Authors:*
Krista Nicholson, Martin van Aswegen, Neil Loneragan and Lars Bejder

*Abstract*
Wildlife management requires reliable demographic information to assess the
status of a population and its vulnerability to threats. This study
calculated age class- and sex-specific demographic parameters and assessed
the viability of a community of Indo-Pacific bottlenose dolphins (Tursiops
aduncus) resident to the Peel-Harvey Estuary in Western Australia.
Boat-based photo-identification surveys (n = 483) were conducted between
2016 and 2019. A population viability analysis (PVA) was used to assess the
community status and evaluate the effects of adult female and calf
mortality, and reproduction on population growth rate. The community
comprised 88 (SD = 4.43) individuals with a sex ratio close to parity in
all but the adult age class where it was skewed towards females.
Demographic changes in this community are driven by births, deaths, and the
likely permanent emigration of juvenile males. No immigration was observed.
The population is stable (r = -0.004, SD = 0.062) given the current
demographic rates. To maintain a community of ~90 individuals, management
should consider action to lower adult female and calf mortality. This
should involve aiming for zero human caused mortality and ensuring adverse
impacts to the population are considered in future development planning.

You can access the article via the below link:
Demographics and viability of an estuarine community of Indo‐Pacific
bottlenose dolphins - Nicholson - Marine Mammal Science - Wiley Online
Library <https://onlinelibrary.wiley.com/doi/full/10.1111/mms.12961>

Thank you for your interest!

All the best,

Krista Nicholson
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