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Marine Biology

, Volume 147, Issue 6, pp 1333–1342 | Cite as

Changes in feeding mechanisms during early ontogeny in juveniles of Crepidula fecunda (Gastropoda, Calyptraeidae)

  • Y. A. Montiel
  • O. R. ChaparroEmail author
  • C. J. Segura
Research Article

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.

Keywords

Shell Length Food Particle Gill Filament Isochrysis Early Juvenile 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We thank Mr. R. Silva for his help with the SEM samples. This research was founded by Fondecyt - Chile (Grant 1020171).

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Y. A. Montiel
    • 1
  • O. R. Chaparro
    • 1
    Email author
  • C. J. Segura
    • 1
  1. 1.Instituto de Biologia Marina ‘Dr. Jurgen E. Winter’Universidad Austral de ChileValdiviaChile

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