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Morphology and development of the early growth stages of an Indonesian Stylaster (Cnidaria: Hydrozoa)

Published online by Cambridge University Press:  10 February 2010

Stefania Puce ,
Marzia Bo ,
Cristina Gioia Di Camillo ,
Linda Paoli ,
Daniela Pica  and
Giorgio Bavestrello
Stefania Puce*
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
Marzia Bo
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
Cristina Gioia Di Camillo
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
Linda Paoli
Affiliation:
Dipartimento di Biologia, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy
Daniela Pica
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
Giorgio Bavestrello
Affiliation:
DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
*
Correspondence should be addressed to: S. Puce, DiSMar, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy email: s.puce@univpm.it
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Abstract

The aim of this work is to describe the skeletal morphology of the early stages of the colonies of Stylaster sp., settled on artificial panels placed along a coral reef in the Bunaken Marine Park (North Sulawesi, Indonesia). The youngest observed stage deriving from the planula settlement is represented by a well developed primary cyclosystem symmetrically budding two secondary cyclosystems in a very early phase of growth. Successively each cyclosystem starts its vertical growth producing new cyclosystems sympodially arranged. At the same time the basal disc of the first cyclosystem enlarges producing a flattened crust from which new colonies arise. Vertical and encrusting forms are considered different modalities to face the problem of space competition in marine benthic organisms. The colonies of Stylaster sp. grow using both strategies resulting in the asexual reproduction of several colonies from a single settled planula. The new cyclosystems originate as small volcano-like elevations having the centre filled with calcium carbonate. Gradually this calcareous matrix dissolves starting from its perimetric zone and leads to the formation of the gastrostyle and the ring palisade. It is plausible that the cells composing the stolon nets deeply pervading the calcareous structure are responsible for this skeletal plasticity.

Keywords

StylasteridaeStylastergrowth stagesIndonesia
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Special Issue 6: In Honour of Sir Frederick Stratten Russell, FRS , September 2010 , pp. 1145 - 1151
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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