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Related Experiment Video

Updated: Jul 11, 2026

Bioindication Testing of Stream Environment Suitability for Young Freshwater Pearl Mussels Using In Situ Exposure Methods
07:53

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Published on: September 5, 2018

Environmental and evolutionary stability in bivalve mollusks.

C W Thayer

    Science (New York, N.Y.)
    |November 29, 1974
    PubMed
    Summary

    Environmental stability does not affect marine bivalve duration. Excluding factors like cosmopolitanism, research shows no link between stable or unstable habits and how long bivalve genera survive.

    Area of Science:

    • Paleontology
    • Marine Biology
    • Evolutionary Biology

    Background:

    • The "depauperate gene pool" hypothesis suggests environmental stability influences extinction rates.
    • Marine bivalve mollusks offer a model to test hypotheses on extinction and survival.
    • Understanding factors affecting generic duration is crucial for evolutionary studies.

    Purpose of the Study:

    • To investigate the relationship between environmental stability and generic duration in extinct marine bivalves.
    • To test the validity of the "depauperate gene pool" hypothesis.
    • To determine if environmental habit (infaunal vs. epifaunal) impacts bivalve genus survival rates.

    Main Methods:

    • Analyzed fossil marine bivalve data, categorizing genera by environmental habit (infaunal/stable vs. epifaunal/unstable).

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    Standardizing a Non-Lethal Method for Characterizing the Reproductive Status and Larval Development of Freshwater Mussels (Bivalvia: Unionida)

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  • Statistically controlled for confounding factors, including cosmopolitanism and other "paleontological noise."
  • Compared generic durations between stable and unstable bivalve groups.

    • Main Results:

    • No significant relationship was found between environmental stability (infaunal vs. epifaunal) and generic duration in marine bivalves.
    • The effect of cosmopolitanism, which correlates with longer generic durations, was excluded.
    • Results contradict the "depauperate gene pool" hypothesis.

    Conclusions:

    • Environmental stability, indicated by infaunal or epifaunal habits, does not influence the survival duration of marine bivalve genera.
    • The "depauperate gene pool" hypothesis is not supported by this analysis of marine bivalves.
    • Future research should consider the complex interplay of factors beyond environmental stability in extinction dynamics.