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Related Experiment Videos

A gastric-brooding asteroid, Smilasterias multipara.

Miéko Komatsu1, P Mark O'Loughlin, Barry Bruce

  • 1Department of Biology, Faculty of Science, Toyama University, Japan. miekok@sci.u-toyama.ac.jp

Zoological Science
|September 15, 2006
PubMed
Summary
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The sea star Smilasterias multipara broods its young internally, protecting them from digestion. Juveniles emerge fully developed, indicating unique reproductive adaptations in this asteroid species.

Area of Science:

  • Marine Biology
  • Echinoderm Research
  • Reproductive Ecology

Background:

  • The asterinid sea star Smilasterias multipara exhibits gastric brooding behavior.
  • Reproductive strategies in sea stars vary significantly, with brooding being a notable adaptation.

Purpose of the Study:

  • To document the reproductive cycle and developmental stages of Smilasterias multipara.
  • To investigate the mechanisms of gastric brooding and juvenile development in this species.

Main Methods:

  • Laboratory observations of spawning and gamete release.
  • Microscopic examination of embryonic and larval development.
  • Monitoring of juvenile growth and emergence from the parent.

Main Results:

Related Experiment Videos

  • Smilasterias multipara broods eggs and developing juveniles within the female's stomach from late August to early November.
  • Development is direct, bypassing planktonic stages, with lecithotrophic brachiolaria larvae.
  • Metamorphosis is completed within the parent, with juveniles emerging approximately two months post-fertilization.

Conclusions:

  • Smilasterias multipara possesses specialized adaptations for protecting brooding embryos and juveniles from gastric digestion.
  • The direct development and gastric brooding strategy likely enhance juvenile survival rates.