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Mating system and evidence of multiple paternity in the Antarctic brooding sea urchin Abatus agassizii

Polar Biology volume 40, pages 787–797 (2017)Cite this article

Abstract

Broadcasting is the predominant spawning behavior among benthic marine invertebrates, mainly associated with planktotrophic and planktonic lecitotrophic development. Broadcasting allows genetic mixing that should contribute to increase the genetic diversity of a female clutch. Conversely, in brooding species characterized by protected development, oocytes are retained and only sperm is released, which is supposed to limit the number of males that contribute to a female clutch. This spermcasting behavior together with egg retention, unusually frequent among Antarctic marine invertebrates, putatively give brooders low dispersal capacities which may reduce genetic mixing and generate genetic and kinship structure at a small spatial scale. Like many other Antarctic marine benthic invertebrates, the irregular sea urchin Abatus agassizii is a spermcaster that broods its young. In this study, we assessed the genetic diversity among 66 adults using 6 polymorphic microsatellite loci and performed progeny array analyses in order to evaluate the number of mates per female as well as genetic structure at a small spatial scale. A. agassizii exhibited a polyandric system with 2–5 mates per female regardless of population density. Bayesian analyses suggested the absence of genetic structure along our 20-m transect, while relatedness among individuals did not differ from that expected under panmixia. Finally, we conclude that a limited number of males contribute to a female clutch, probably as a consequence of limited sperm dispersal and that movement of adults may be sufficient to avoid kinship structure in the population.

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Acknowledgments

This study was supported by the Grants PFB-23 and ICM P05-002 and Thesis project INACH M02_10 and CONICYT PhD 21150317 to C.M; INACH D05-09, FP_03-12, CONICYT Ph.D. D-21060218, D21-08 and Postdoctoral FONDECYT 3130677 to A.D, Fondecyt post-doctorate 3100139 and INACH F01_09 to K.G and Egide program ECOS-Sud C06B02 to E.P. and J-P.F.

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Authors and Affiliations

  1. Instituto de Ecología y Biodiversidad (IEB), Facultad de Ciencias, Universidad de Chile, Casilla 653, 7800003, Santiago, Chile

    Claudia S. Maturana, Karin Gérard, Angie Díaz & Elie Poulin

  2. GAIA-Antártica, Universidad de Magallanes, Avenida Bulnes 01890, 621-0427, Punta Arenas, Chile

    Karin Gérard

  3. Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Victor Lamas 1290, Victor Lamas 1290, 4070386, Concepción, Chile

    Angie Díaz

  4. Biogéosciences, UMR CNRS 6282, Université de Bourgogne, 6, boulevard Gabriel, 21000, Dijon, France

    Bruno David

  5. Muséum national d’Histoire naturelle, 57 rue Cuvier, 75005, Paris, France

    Bruno David

  6. UMR 7263 - IMBE, Station Marine d’Endoume, Institut Méditerranéen de Biodiversité et d’Ecologie Marine et continentale, Chemin de la Batterie des Lions, 13007, Marseille, France

    Jean-Pierre Féral

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  1. Claudia S. Maturana
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Correspondence to Claudia S. Maturana.

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Maturana, C.S., Gérard, K., Díaz, A. et al. Mating system and evidence of multiple paternity in the Antarctic brooding sea urchin Abatus agassizii . Polar Biol 40, 787–797 (2017). https://doi.org/10.1007/s00300-016-2001-3

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Keywords

  • Parentage analysis
  • Polyandry
  • Spermcast
  • Vagility
  • Panmixia