SHELL GROWTH OF THE FRESHWATER UNIONID UNIO CRASSUS FROM ESTONIAN RIVERS

Abstract

Abstract. Life- span and growth ra te of th e biva lve moll use Unio crass us from some sma ll Esto nian r iver s wer e es t imated. Growth r at e wa s compa re d to th e curre nt mean summer air ternperat ure, a nd to the amoun t of precipit a tion of the previou s year. The rea sons probably ca us ing the diff er ent g rowth patterns are bri efl y discu ssed .