巴西东南部罗德里戈·德·弗雷塔斯泻湖皮拉奎海峡中赤潮异弯藻（金藻纲）的反复爆发。

Recurrent blooms of Heterosigma akashiwo (Raphidophyceae) in the Piraquê Channel, Rodrigo de Freitas Lagoon, southeast Brazil.

作者信息

Branco S, Menezes M, Alves-de-Souza C, Domingos P, Schramm M A, Proença L A O

机构信息

Museu Nacional, Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, RJ, Brazil.

Instituto de Biologia Roberto A. Gomes - IBRAG, Universidade Estadual do Rio de Janeiro - UERJ, Rio de Janeiro, RJ, Brazil.

出版信息

Braz J Biol. 2014 Aug;74(3):529-37. doi: 10.1590/bjb.2014.0074.

DOI:10.1590/bjb.2014.0074

PMID:25296199

Abstract

Six blooms of Heterosigma akashiwo (Raphidophyceae) were observed from March 2007 through March 2008 in the Rodrigo de Freitas Lagoon, a semi-confined eutrophic system located in Rio de Janeiro state, southeast Brazil. Vegetative cells of H. akashiwo analysed by optical and electron microscopy showed morphology as described in the literature. The blooms (2.8 × 10(4) to 4 × 10(8) cell.L(-1)) were restricted to the middle section of the Piraquê Channel, which is situated in the northeastern part of the lagoon and receives freshwater inflow. The salinity of subsurface water and the channel depth showed significant negative correlations with H. akashiwo abundances, and appeared to restrict the blooms to this compartment of the lagoon. No fish mortality was associated with the H. akashiwo blooms, nor were brevetoxins detected in a cell extract obtained from the bloom observed on 19 March 2007.

摘要

2007年3月至2008年3月期间，在巴西东南部里约热内卢州一个半封闭的富营养化系统——罗德里戈·德·弗雷塔斯泻湖中，观察到六次赤潮异弯藻（Raphidophyceae）水华。通过光学显微镜和电子显微镜分析的赤潮异弯藻营养细胞显示出文献中描述的形态。这些水华（细胞密度为2.8×10⁴至4×10⁸个细胞·升⁻¹）局限于皮拉奎海峡的中部，该海峡位于泻湖的东北部，有淡水流入。表层以下水体的盐度和海峡深度与赤潮异弯藻的丰度呈显著负相关，似乎将水华限制在泻湖的这一区域。没有观察到与赤潮异弯藻水华相关的鱼类死亡，在2007年3月19日观察到的水华所获得的细胞提取物中也未检测到短裸甲藻毒素。