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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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Modified Fear Conditioning for Inducing Flight Behaviors in Mice
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Published on: December 15, 2023

Gutless bivalves.

R G Reid, F R Bernard

    Science (New York, N.Y.)
    |May 9, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A newly discovered marine bivalve, Solemya, lacks a digestive tract. This gutless bivalve likely absorbs dissolved organic matter directly from seawater through its specialized gills.

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    Area of Science:

    • Marine Biology
    • Invertebrate Zoology
    • Bivalve Physiology

    Background:

    • The protobranch bivalve genus Solemya inhabits marine environments.
    • Nutritional strategies in bivalves vary, with some relying on filter-feeding and others on chemosymbiosis or absorption.
    • The presence or absence of a gut significantly impacts an organism's feeding and digestive mechanisms.

    Purpose of the Study:

    • To describe a new benthic species of the bivalve genus Solemya from the northeastern Pacific Ocean.
    • To investigate the nutritional mechanisms of this newly discovered gutless bivalve species.
    • To determine the physiological adaptations supporting nutrient absorption in the absence of a digestive system.

    Main Methods:

    • Morphological and anatomical examination of the new Solemya species.
    • Histological analysis of gill tissues to identify cellular structures and enzymatic activity.
    • Physiological assessment of nutrient absorption capabilities.

    Main Results:

    • A new benthic species belonging to the protobranch bivalve genus Solemya was identified in the northeastern Pacific Ocean.
    • This species completely lacks a gut and any internal or external digestive enzymatic apparatus.
    • The large, well-vascularized ctenidial lamellae, cleansed by cilia and possessing phosphatases, are proposed as the primary site for absorbing dissolved organic molecules.
    • The related species Solemya borealis may also exhibit a gutless morphology.

    Conclusions:

    • The newly described Solemya species represents an extreme adaptation to a gutless existence in a benthic environment.
    • Nutrient acquisition in this species is achieved through direct absorption of dissolved organic matter via highly adapted gill structures.
    • This finding expands our understanding of nutritional diversity and physiological plasticity within marine bivalves.