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Title: Seasonal Occurrence and Aggregation Behavior of the Sea Urchin Astropyga pulvinata (Echinodermata: Echinoidea) in Bahia Culebra, Costa Rica 
Author: Alvarado, Juan Jose
Date: 2008-10
Publisher: Honolulu, University of Hawaii Press
Citation: Alvarado JJ. Seasonal Occurrence and Aggregation Behavior of the Sea Urchin Astropyga pulvinata (Echinodermata: Echinoidea) in Bahia Culebra, Costa Rica. Pac Sci 62(4): 579-592.
Abstract: Between October 2003 and July 2005, aggregation behavior of the sea urchin Astropyga pulvinta Lamarck was studied in Bahı´a Culebra, Costa Rica. This sea urchin forms aggregations during part of the year and then disappears. I quantified the number of individuals present in a defined area each month, their aggregation behavior between day and night, and their size. Also, temperature and nutrient concentrations of the water were sampled. There were significantly more individuals in aggregations during the colder, upwelling season (December to April). Aggregations consisted of adult individuals that exploit food during the upwelling season. Moreover, these aggregations were used as a refuge by several fish species of high commercial value for the aquarium trade. These sea urchin populations could suffer as extraction of ornamental fishes and urchins increases. Their abundance and behavior should continue to be monitored as an indication of the ecological health of the community.
Series/Report No.: vol. 62, no. 4
Description: v. ill. 23 cm. Quarterly
Pages/Duration: 14 p.
ISSN: 0030-8870
URI: http://hdl.handle.net/10125/22733
LC Subject Headings: Natural history--Periodicals.
Science--Periodicals
Natural history--Pacific Area--Periodicals.

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