[MARMAM] New publication: Copulation rate declines with mating group size in dusky dolphins (Lagenorhynchus obscurus)

Dara Orbach dnorbach at gmail.com
Tue Jun 2 20:13:25 PDT 2015

> Dear colleagues,
> My co-authors and I are pleased to announce the publication of a new paper:
> Orbach, D.N., Rosenthal, G.G.,  and Würsig, B. 2015. Copulation rate
> declines with mating group size in dusky dolphins (*Lagenorhynchus
> obscurus*). *Canadian Journal of Zoology* 93: 503-507. doi:
> 10.1139/cjz-2015-0081
> Males in polygamous species often engage in intrasexual competition for
> mates. If females actively evade mating attempts, it may benefit males to
> cooperate to restrict female movement, as has been found in some mammals.
> We tested if male dusky dolphins (Lagenorhynchus obscurus (Gray, 1828))
> cooperate or compete during group mating chases. If they cooperate, then the
> per-male probability of copulating should increase with group size; if they
> compete, then the probability should decrease. We followed mating groups
> by boat during the breeding season (October 2013 – January 2014) off
> Kaikoura, New Zealand. The copulation rate per male decreased with
> increasing group size and with the number of noncopulating males in
> proximity to a copulating female. Male dusky dolphins have multiple mates
> and appear to use sperm and exploitative scramble competition. Males may
> remain in mating groups despite competition because there are alliances
> within the groups, they are unable to exclude rivals from joining a
> group, the time and energy costs of searching for unescorted females exceed
> the costs of reduced mating opportunities in a group, they receive other
> direct or indirect benefits that offset the costs of reduced mating
> opportunities, or they are in the group largely for social learning
> rather than procreation
> A PDF version of the paper is available online at:
> http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2015-0081

> or via e-mail request to: dnorbach at gmail.com
> Cheers,
> Dara Orbach
> Ph.D. candidate
> Marine Mammal Behavioral Ecology Group
> Department of Marine Biology- IDP
> Texas A&M University at Galveston
> http://www.tamug.edu/mmbeg
> <https://mail.tamug.edu/owa/redir.aspx?C=w7_17uzzE0Wzl12-LslBsbpT6EkNV9III3tYOwsbMreAXEuFEo1k4nTOslpP-5SPFXVAlgdqC0s.&URL=http%3a%2f%2fwww.tamug.edu%2fmmbeg>
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