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<p>Les <strong>bivalves</strong> ou Bivalvia sont les mollusques d'eau douce et d'eau de mer au corps aplati qui poss&egrave;dent une coquille double, pouvant s'entrouvrir et se refermer. Ils se nourrissent en filtrant l'eau et s'enfouissent &agrave; l'abri des pr&eacute;dateurs.</p> ]]></baseNameString></baseName>  </occurrence></topic>  <association>    <instanceOf>      <topicRef xlink:href="#broader-narrower"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#narrower"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=408"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=398"/>    </member>  </association>  <association>    <instanceOf>      <topicRef xlink:href="#synonym"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#non-preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=440"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=408"/>    </member>  </association>  <association>    <instanceOf>      <topicRef xlink:href="#synonym"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#non-preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=441"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#preferred-term"/>      </roleSpec>      <topicRef xlink:href="#http://thesaurus.abuledu.org/thesaurus/vocab/?tema=408"/>    </member>  </association></topicMap>