[MARMAM] New publication: Evasive behaviours of female dusky dolphins (Lagenorhynchus obscurus) during exploitative scramble competition

Dara Orbach dnorbach at gmail.com
Tue Sep 1 08:56:47 PDT 2015

Dear colleagues,

My co-authors and I are pleased to announce the publication of a new paper:

Orbach DN, Packard JM, Kirchner T, and Würsig, B. 2015. Evasive
behaviours of female dusky dolphins (Lagenorhynchus obscurus) during
exploitative scramble competition. *Behaviour *doi:

When males engage in scramble competition, are females non-evasive
recipients of male coercion or evasive? Small groups of male dusky dolphins
(Lagenorhynchus obscurus) engage in exploitative (non-interference)
scramble competition for access to oestrous females near Kaikoura, New
Zealand. We conducted behavioural sequence analyses of videos of 48 mating
groups with continuous records and focal individual follows of females. We
determined (1) the frequency and type of behaviours (non-evasive vs.
evasive), (2) the variation in simple transition probabilities of
behaviours leading to a copulatory position associated with female
resistance and non-resistance and (3) the variation in female responses to
male behaviours throughout focal follows. Females exhibited frequent active
evasive manoeuvers following male behaviours. Copulation sequences were
highly variable and most complex when terminated by females. Females
altered responses to male signals, one aspect of mate choice potentially
favouring male endurance.

A PDF version of the paper is available online at:

or via e-mail request to dnorbach at gmail.com

Dara Orbach

Ph.D. candidate
Marine Mammal Behavioral Ecology Group
Department of Marine Biology- IDP
Texas A&M University at Galveston
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