FIRST OBSERVATION OF THE POTENTIALLY TOXIC AND INVASIVE CYANOBACTERIUM SPECIES Cylindrospermopsis raciborskii (WOLOSZYNSKA) IN TUNISIAN FRESHWATERS: TOXICITY ASSESSMENT AND MOLECULAR CHARACTERIZATION

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Afef Fathalli (Autor) Outra; Amel Ben Rejeb Jenhani (Autor) Outra; Cristiana Moreira (Autor) Outra; Martin Saker (Autor) Outra; Mohamed Romdhane (Autor) Outra; Vitor Vasconcelos (Autor) Outra

Revista

Título: Fresenius Environmental Bulletin

Vol. 19

Páginas: 1074-1083

ISSN: 1018-4619

Editora: Technische Universitat Munchen

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 9 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

Outras Informações

ID Authenticus: P-003-B0B

Abstract (EN): Cylindrospermopsis raciborskii is a freshwater cyanobacterium of tropical origin, also found in temperate regions. Due to its known ability to produce potent toxins, such as cylindrospermopsin and paralytic shellfish poisons, this species is of major concern from a water quality perspective. In this article, we report, for the first time, the occurrence of Cylindrospermopsis raciborskii in Tunisian freshwaters. The morphological characteristics of this strain, observed in reservoir Bir M'Cherga, conformed to those of natural population species described in the literature. It produced only straight trichomes. During the study (October 2004-December 2005), the highest density of this species (1.16 x 10(6) trichomes L(-1)) was observed in August 2005. The toxicity assessment of one isolated strain was investigated by mouse bioassay, ELISA, HPLC, and molecular biology techniques. In spite of the presence of the PKS gene, the PS and the AMT genes were absent. The Tunisian isolate of Cylindrospermopsis raciborskii from the reservoir Bir M'Cherga does not produce cylindrospermopsin, and it seems not to be a neurotoxin producer. The increased geographical distribution of this planktonic species shows that, due to its invasive behavior, potential risk should be included in the monitoring protocols.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10