Ocorrência de dinoflagelados tecados potencialmente tóxicos e nocivos em cultivos de moluscos situados no município de Penha, SC

Abstract

The purpose of this study was to describe the composition and occurrence of potentially toxic and harmful species of thecate dinoflagellates in cultured shellfish, located at Armação do Itapocorói (AI) and Praia Alegre (PA) in the municipality of Penha, SC -Brazil. Water samples were collected and environmental parameters (salinity, water temperature and depth of Secchi disk) were determined weekly between April 2007 and April 2008 at two sites by a monitoring program maintained by the Laboratory for the Study of Harmful Algae, CTTMar, UNIVALI. The identification of the organisms was made through an Olympus microscope, model BX41 with up to 1000x. During the sampling period, we identified 21 species of thecate dinoflagellates potentially toxic and harmful in the genus Alexandrium, Ceratium, Dinophysis and Prorocentrum. The species P. obtusum (86%), D. acuminata (78.5%) and P. micans (72%) were very frequent throughout the period in the two sample points. The point with highest species richness was the AI, with 14 species, and the PA had the lowest richness with only two species. Most samples were considered rare relative to the abundance of thecate dinoflagellates compared to the presence of harmful microalgae, but during the month of September 2007, were considered abundant, during which there was a bloom of D. acuminata. The similarity between the two points throughout the sampling period reached a high coefficient (86%), and between the months examined, June 2007 showed the lowest similarity (10%) and July 2007 the greatest similarity recorded (91%). The composition and distribution of thecate dinoflagellates during the study showed that the existence of a dynamic community structure could be used as a tool to aid the monitoring of harmful algae mariculture activity in this region.

Pigment-based chemotaxonomy of the phytoplankton community from a marine mussel farming area

“…Two species analyzed in this work, Thalassionema nitzschioides and Skeletonema sp., were considered as abundant in the region. In other work Miotto & Tamanaha (2012) found 20 Dinoflagellates species in the region, ten of them of the genus Prorocentrum. The Dinoflagellates contribution to the phytoplankton community reached 65% in one sample (Miotto & Tamanaha, 2012).…”

“…In other work Miotto & Tamanaha (2012) found 20 Dinoflagellates species in the region, ten of them of the genus Prorocentrum. The Dinoflagellates contribution to the phytoplankton community reached 65% in one sample (Miotto & Tamanaha, 2012). In this work, a similar trend occurred in the phytoplankton seasonal distribution, with abundance peaks in spring, characteristic in this area (Dell'Agnollo, 2011).…”

Cultivo de Moluscos Bivalves: Algas Nocivas e Bases para Programa de Monitoramento de Ficotoxinas em Fazenda de Maricultura de Arraial do Cabo, RJ

“…A intoxicação por venerupino(a) ou VSP (Venerupine Shellfish Poisoning) constitui um sério problema de saúde pública em certas regiões do Japão, Golfo do México e Flórida com registros de contaminação de moluscos (BARBIERI, 2009;MIOTTO;TAMANAHA, 2012). A venerupina é uma substância produzida por variedades do dinoflagelado Prorocentrum minimum, encontrado em águas salobras, frias, temperadas a tropicais (MIOTTO; TAMANAHA, 2012).…”