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      Sex in Cetaceans : Morphology, Behavior, and the Evolution of Sexual Strategies 

      Sexual Behavior and Anatomy in Porpoises

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          Abstract

          Among the taxonomic family of porpoises (Phocoenidae), mating behavior in nature has been described in detail only for the harbor porpoise ( Phocoena phocoena). We review this species’ unusual mating habits based on a study in San Francisco Bay, California, USA, and present new data from across its range in the North Pacific, North Atlantic, Black Sea, and managed care. Results confirm the male’s unique laterality oriented solely to the female’s left side as contact occurred both in nature and managed care. The male’s high-energy sexual approach to the female led to splashy aerial behavior at the surface in nature. Drone footage provided observations of subsurface mating behavior, including evidence of male–male sexual interactions and a male calf interacting sexually with its mother. Harbor porpoise reproductive anatomy is also presented, with new comparative information on the vaquita ( Phocoena sinus). The harbor porpoise’s lateralized behavior and anatomy (i.e., long asymmetric penis, large testes size, convoluted asymmetric female reproductive tract) may have coevolved. We note gaps in knowledge, suitable platforms for future investigations (drones, bridges, boats, and coastal cliffs), and what is known about mating behavior in other porpoise species, including hybridization. We conclude with conservation implications for porpoises and encourage researchers to recognize and report mating behavior as baseline data valuable for establishing marine conservation areas.

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          Size and Function of Mammalian Testes in Relation to Body Size

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            LIFE IN THE FAST LANE: THE LIFE HISTORY OF HARBOR PORPOISES FROM THE GULF OF MAINE

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              Marine Mammals of the World; A Comprehensive Guide to Their Identification

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                Author and book information

                Book Chapter
                2023
                September 26 2023
                : 415-441
                10.1007/978-3-031-35651-3_18
                fe0d6b91-40c0-4f1a-a0e2-f32677e40a11
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