Changes in feeding mechanisms during early ontogeny in juveniles of <Emphasis Type="Italic">Crepidula fecunda</Emphasis> (Gastropoda,Calyptraeidae) |
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Authors: | Y?A?Montiel Email author" target="_blank">O?R?ChaparroEmail author C?J?Segura |
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Institution: | (1) Instituto de Biologia Marina ‘Dr. Jurgen E. Winter’, Universidad Austral de Chile, Casilla 567, Valdivia, Chile |
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Abstract: | Feeding in early life stages of the sedentary snail Crepidula is effected both by the use of the radula and by filtering with the gill. The present study is a contribution to the knowledge
of the mechanisms of feeding by early juvenile snails of Crepidula fecunda. Experimental observations were made on specimens of known ages as they were fed constant concentrations of microalgae in
the presence of a primary biological film on a glass substrate. Feeding activity was filmed under the microscope, and images
were digitized for the identification and quantification of feeding structures. A morphological analysis was made of the structures
associated with this process. Results showed that the radula was functional beginning in 1-day-old juveniles, and the gill
functioned in respiration. Gill function in filter-feeding began in juveniles of 9 days old when dorsal and ventral ciliation
had developed, as well as the food pouch. The latter structure begins activity as soon as the gill starts food collection.
Osphradia appeared simultaneous with development of the filter feeding capacity by the gill. In their earliest stages after
metamorphosis, the young snails begin life by radular scraping of primary biofilms, gradually shifting to filter feeding as
the gill developed a critical number of filaments and cilia. |
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