on the occurrence of obelia medusa blooms and empirical evidence of unusual massive accumulations of obelia and amphisbetia hydroids on the argentina shoreline bloom de la medusa obelia y evidencia empírica de una inusual acumulación masiva de hidroides de obelia y amphisbetia en la línea de costa en argentina

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ID: 258561
2008
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Abstract
Medusa blooms are a scarcely known phenomenon. For temperate, southwestern Atlantic waters, reports of such events are almost nonexistent. This research reports the analysis of a total of 1043 plankton samples taken from 1993 to 2006 and benthic samples collected by seasonal SCUBA diving since 1997 along the Buenos Aires coast. The medusa Obelia longissima was observed in very low densities and frequen-cies, except in October 2003, when a bloom of this species was detected. Soon afterward, two consecutive massive accumulations of O. longissima and Amphisbetia operculata colonies were detected on the coast by the mhabitants of Mar del Plata (38°00'S-57°32'W) and the coastal Mar Chiquita Lagoon (37°32'S-57°19'W) between March and April 2004. The colonies of both species were collected from the shoreline at low tide at both sites. The environmental factors of that period seemed to be particularly appropriate for promoting optimum growth conditions for these hydroid species. This paper reports and describes the mentioned abnormal phe-nomena, providing baseline information on these little-understood events.
Los blooms de medusas son un fenómeno escasamente conocido. En las aguas templadas del Atlántico sudoccidental, esta clase de eventos son casi inexistentes. Un total de 1.043 muestras de plancton de 1993 a 2006 fueron analizadas como también aquellas de bentos colectadas por SCUBA estacionalmente desde 1997 en la costa de Buenos Aires. Para la medusa Obelia longissima fueron observadas muy bajas densidades y frecuencias, con excepción de octubre de 2003 cuando un bloom de esta medusa fue detectado. Seguidamente, dos acumulaciones masivas consecutivas de colonias de O. longissima y de Amphisbetia operculata fueron detectadas sobre la línea de costa por habitantes de Mar del Plata (38°00'S-57°32'W) y de la laguna costera Mar Chiquita (37°32'S-57°19'W) entre marzo y abril del 2004. Las colonias de ambas especies fueron colectadas desde la línea de costa durante marea baja en ambas localidades. Los factores ambientales en ese período mostraron ser particularmente apropiados promoviendo las condiciones óptimas para el crecimiento de los hidroides de estas especies. Este trabajo reporta y describe el mencionado anormal fenómeno, dando información de base sobre estos eventos poco conocidos.
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Authors Gabriel Genzano, Hermes Mianzan, Luciana Diaz-Briz, Carolina Rodríguez
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Journal Orthopaedic journal of sports medicine
Year 2008
DOI
DOI not found
URL
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2008000200011
Keywords
fisheries cnidaria anglingoceanographybiology (general) buenos aires coast

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