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Reproductive isolation and genetic differentiation in North American species of Triops (Crustacea: Branchiopoda: Notostraca)

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Studies on Large Branchiopod Biology and Conservation

Part of the book series: Developments in Hydrobiology ((DIHY,volume 125))

Abstract

Electrophoretic analysis of 31 populations, ranging from California to Kansas, indicates that the North American tadpole shrimp Triops longicaudatus (LeConte) is actually a mixture of at least two reproductively isolated species. In the central United States, the predominant species is T. longicaudatus, which is found typically in ephemeral prairie pools. In the southwestern United States, the predominant species is Triops newberryi (Packard), which characteristically inhabits large playa pools. The two species coexist occasionally and in sympatric situations they are reproductively isolated from each other. The two species are genetically distinct at a level greater than is typical of conspecific populations. These genetic differences are correlated with subtle morphological differences and profound differences in reproductive biology. Both species represent complexes of bisexual and unisexual populations. Bisexual populations of T. longicaudatus are usually composed of males and females in approximately equal frequencies; bisexual populations of T. newberryi are composed of males in low frequencies and self-compatible hermaphrodites. Unisexual populations of both species apparently consist entirely of self-compatible hermaphrodites.

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Authors and Affiliations

  1. Department of Biology, University of California, Riverside, CA, 92521, USA

    Clay Sassaman & Michael Fugate

  2. Department of Biology, University of San Diego, Alcala Park, San Diego, CA, 92110, USA

    Marie A. Simovich

  3. Joint Science Department, Claremont Colleges, Claremont, CA, 91711, USA

    Michael Fugate

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  1. Clay Sassaman
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  2. Marie A. Simovich
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  3. Michael Fugate
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Editors and Affiliations

  1. Department of Biology, University of San Diego, 5998 Alcala Park, 92110, San Diego, CA, USA

    Marie A. Simovich

  2. Department of Biology, University of California, 92521, Riverside, CA, USA

    Clay Sassaman

  3. Biology Department, Our Lady of the Lake University, 78207, San Antonio, TX, USA

    Denton Belk

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Sassaman, C., Simovich, M.A., Fugate, M. (1997). Reproductive isolation and genetic differentiation in North American species of Triops (Crustacea: Branchiopoda: Notostraca). In: Simovich, M.A., Sassaman, C., Belk, D. (eds) Studies on Large Branchiopod Biology and Conservation. Developments in Hydrobiology, vol 125. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3177-5_14

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  • DOI: https://doi.org/10.1007/978-94-017-3177-5_14

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