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Spatial and temporal distribution in a tropical hydroid assemblage

Published online by Cambridge University Press:  17 November 2008

C.G. Di Camillo ,
G. Bavestrello ,
L. Valisano  and
S. Puce
C.G. Di Camillo*
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
G. Bavestrello
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
L. Valisano
Affiliation:
DipTeRis, Università di Genova, Corso Europa, 26 16100 Genova, Italy
S. Puce
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
*
Correspondence should be addressed to: C.G. Di Camillo, DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy email: dicamillo@univpm.it
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Abstract

The hydroid assemblage of the Siladen Island coral reef (North Sulawesi, Indonesia) is made up of 107 species belonging to 51 genera and 28 families. The study of their spatial distribution has identified three different zones which are well-characterized: (1) the reef flat, where hydroids are mainly represented by cryptic species living in the shady crevices of the corals, epibiontic on sponges or sea grasses; (2) the edge of the reef characterized by hydroids growing mainly on the shady side of the corals, with the exception of the tufts of the large colonies of the stinging zooxanthellate Aglaophenia cupressina; and (3) the vertical reef, where hydroids reach their maximum diversity and abundance and are often involved in symbiotic relationships.

The number of hydroid species shows a seasonal trend with a summer minimum (July–September) and a winter maximum (November–February). The strong correlation between these variations and the abundance of rainfall suggests that food availability, strictly related to the seasonal amount of rain, represents the main abiotic factor triggering the hydroid species richness and the abundance of this tropical assemblage.

Keywords

seasonalitydepthdistributionhydroidsIndonesiaenvironmental factors
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Special Issue 8: Hydrozoans , December 2008 , pp. 1589 - 1599
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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