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Encrusting bryozoan colonies on stones and algae: variability of zooidal size and its possible causes

Published online by Cambridge University Press:  25 July 2008

Ekaterina B. Yagunova  and
Andrew N. Ostrovsky
Ekaterina B. Yagunova*
Affiliation:
Department of Invertebrate Zoology, Faculty of Biology & Soil Science, St Petersburg State University, Universitetskaja nab. 7/9, 199034, St Petersburg, Russia
Andrew N. Ostrovsky
Affiliation:
Department of Invertebrate Zoology, Faculty of Biology & Soil Science, St Petersburg State University, Universitetskaja nab. 7/9, 199034, St Petersburg, Russia
*
Correspondence should be addressed to: E.B. Yagunova Department of Invertebrate Zoology Faculty of Biology & Soil ScienceSt Petersburg State UniversityUniversitetskaja nab. 7/9, 199034, St Petersburg, Russia email: [email protected]
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Abstract

This study compared the sizes of zooids in colonies of the cheilostome bryozoan Cribrilina annulata collected from two differing substrata (stones and algae) in three regions of the White and Barents Seas. Zooids of the colonies growing on stones were larger than those in the colonies growing on the thalli of the red alga Odontalia dentata. Size differences of the zooids in the colonies growing on the same substratum in different regions were minor. Three possible explanations for these dimensional differences of zooids are discussed: (1) larvae of different sizes settle on different substrata; (2) ancestrulae of different sizes survive on different substrata; and (3) substrata influence the ancestrulae's size.

Keywords

encrustingbryozoan coloniesstonesalgaevariable zooidal sizepossible causes
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 5 , August 2008 , pp. 901 - 908
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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