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Environmental Induction of Polyembryony in Echinoid Echinoderms.

Jonathan D Allen1, Anne Frances Armstrong2, Shelby L Ziegler3

  • 1Department of Biology, College of William and Mary, Williamsburg, Virginia 23187; and jdallen@wm.edu.

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Environmental changes like higher temperatures and lower salinity can induce polyembryony, the development of multiple embryos from one zygote, in some sea urchin species. This phenomenon may be common in nature but varies across different echinoid species.

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Area of Science:

  • Marine Biology
  • Developmental Biology
  • Ecology

Background:

  • Polyembryony, the development of multiple embryos from a single zygote, is observed across diverse animal taxa.
  • Echinoderms, including sea urchins and sand dollars, exhibit varied reproductive strategies.

Purpose of the Study:

  • To investigate the induction of polyembryony in echinoid embryos under altered environmental conditions.
  • To determine if polyembryony is a common response to environmental fluctuations in sea urchins.

Main Methods:

  • Exposing embryos of *Echinarachnius parma* and *Eucidaris tribuloides* to elevated temperatures and reduced salinity.
  • Testing *Strongylocentrotus droebachiensis* and *Lytechinus variegatus* under similar conditions.

Main Results:

  • Polyembryony was successfully induced in *E. parma* and *E. tribuloides* under laboratory conditions simulating natural environmental variations.
  • Little evidence of polyembryony was found in *S. droebachiensis* and *L. variegatus*, indicating species-specific responses.
  • The results suggest polyembryony may occur frequently in some echinoid species under natural environmental fluctuations.

Conclusions:

  • Environmental shifts, such as changes in temperature and salinity, can trigger polyembryony in certain marine invertebrates.
  • The response to environmental change is not universal across echinoid species, highlighting differential adaptive capacities.
  • Future environmental changes may lead to significant, taxon-specific alterations in marine invertebrate development.