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Evolutionary Ecology

, Volume 26, Issue 2, pp 233–257 | Cite as

Division of labor and recurrent evolution of polymorphisms in a group of colonial animals

  • Scott LidgardEmail author
  • Michelle C. Carter
  • Matthew H. Dick
  • Dennis P. Gordon
  • Andrew N. Ostrovsky
Original Paper

Abstract

Rendering developmental and ecological processes into macroevolutionary events and trends has proved to be a difficult undertaking, not least because processes and outcomes occur at different scales. Here we attempt to integrate comparative analyses that bear on this problem, drawing from a system that has seldom been used in this way: the co-occurrence of alternate phenotypes within genetic individuals, and repeated evolution of distinct categories of these phenotypes. In cheilostome bryozoans, zooid polymorphs (avicularia) and some skeletal structures (several frontal shield types and brood chambers) that evolved from polymorphs have arisen convergently at different times in evolutionary history, apparently reflecting evolvability inherent in modular organization of their colonial bodies. We suggest that division of labor evident in the morphology and functional capacity of polymorphs and other structural modules likely evolved, at least in part, in response to the persistent, diffuse selective influence of predation by small motile invertebrate epibionts.

Keywords

Bryozoa Asexual growth Modularity Polymorphism Evolvability Predation 

Notes

Acknowledgments

J.B.C. Jackson provided inspiration and cajoling that extend well beyond this paper. M. Hopkins, Field Museum, Chicago, and L.K. Nyhart, University of Wisconsin, Madison, provided useful comments on the manuscript. J.G. Harmelin, Centre d’Océanologie de Marseille, Université de la Méditerranée, graciously supplied the images in Fig. 4. MCC acknowledges support from a PhD Commonwealth Scholarship, Victoria University of Wellington, and the National Institute of Water & Atmospheric Research, Wellington. ANO thanks FWF, Austria (grant P22696-B17) and the RFBR, Russia (grants 10-04-00085-a, 10-04-10089-к) for financial support. We are grateful to all.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Scott Lidgard
    • 1
    Email author
  • Michelle C. Carter
    • 2
  • Matthew H. Dick
    • 3
  • Dennis P. Gordon
    • 4
  • Andrew N. Ostrovsky
    • 5
    • 6
  1. 1.Department of GeologyField Museum of Natural HistoryChicagoUSA
  2. 2.Centre for Marine Biodiversity and Biotechnology, School of Life SciencesHeriot-Watt UniversityEdinburghScotland, UK
  3. 3.Division of Natural History Sciences, Faculty of ScienceHokkaido UniversitySapporoJapan
  4. 4.National Institute of Water and Atmospheric ResearchKilbirnie, WellingtonNew Zealand
  5. 5.Department of Invertebrate Zoology, Faculty of Biology and Soil ScienceSt. Petersburg State UniversitySt. PetersburgRussia
  6. 6.Department of Palaeontology, Faculty of Earth Sciences, Geography and Astronomy, GeozentrumUniversity of ViennaViennaAustria

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