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Evasive behaviours of female dusky dolphins (Lagenorhynchus obscurus) during exploitative scramble competition

In: Behaviour
Authors:
Dara N. Orbach aDepartment of Marine Biology, Texas A&M University at Galveston, Galveston, TX 77553, USA

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Jane M. Packard bDepartment of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843, USA

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Theresa Kirchner cDepartment of Fisheries and Wildlife, Marine Mammal Institute, Hatfield Marine Science Center, Oregon State University, Newport, OR 97365, USA

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Bernd Würsig aDepartment of Marine Biology, Texas A&M University at Galveston, Galveston, TX 77553, USA
bDepartment of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843, USA

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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.

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