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Volume 45 - Number 1 - 2010
Article

 


Early stages of Echinoidea in Lagreze Channel, Guaitecas Islands, southern Chile

Carlos Molinet1,3,4, Claudia Herrera1, Paulina Gebauer2, Mauricio F. Landaeta3,5 y Carlos A. Moreno6,7

 

1Instituto de Acuicultura, Universidad Austral de Chile, sede Puerto Montt, Los Pinos s/n, Balneario Pelluco, Casilla 1327, Puerto Montt, Chile
2Centro I~Mar, Universidad Los Lagos, Camino Chinquihue, km 6, Casilla 557, Puerto Montt, Chile
3Centro de Investigación en Nutrición, Tecnología de Alimentos y Sustentabilidad, CIEN Austral, Los Pinos s/n, Balneario Pelluco, Casilla 1327, Puerto Montt, Chile
4Centro Trapananda, Universidad Austral de Chile, Portales 73, Coyhaique, Chile
5Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Valparaíso, Casilla 5080, Reñaca, Viña del Mar, Chile
6Instituto de Ecología y Evolución, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
7Centro de Investigaciones del Ecosistema Patagónico (CIEP), Bilbao 449, Coyhaique, Chile

 

E-mail: cmolinet@uach.cl

 

The limited publications on the dynamics of Echinoids on the coast of Chile, despite its ecological significance to marine benthic communities, have hindered the understanding of the importance of this group on benthic communities and the proposal of appropriate conservation and management measures. The objective of this work was to study the vertical and temporal variability of early stages of Echinoids during spring-summer period in a southern channel of southern Chile and associate it, in the particular case of Loxechinus albus, with the reproductive status of adults individuals. For this, i) daily samples of plankton in three depth strata were collected, every 15 days from October 2005 to February 2006, ii) post-settlers on artificial substrates were monitored and iii) the gonad somatic index was obtained for adult specimens of L. albus. Planktonic larval stages of Arbacia dufresnei, Loxechinus albus, Pseudechinus magellanicus and Ophiuroidea, were identified, as well as Ophiuroidea and L. albus post-settlement. Larvae of L. albus in plankton coincided with a decrease of gonad index in adults of this species, whereas post-settlers were observed 15 days after the longest period of larval density in the plankton. Although information on A. dufresnei and P. magellanicus reproduction in adults was not collected, autumn-winter period has been reported as the period of maximum larval abundance. Echinoids larvae were observed in restricted periods, more frequently on the sea surface at night and in low density compared with previous studies

 

Key words: Larval density, vertical distribution, post-settlers, sea urchin, gonad index

 

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