Ingestion of microcystins by Daphnia: Intestinal uptake and toxic effects

• Tipo: Artigo em Revista Científica Internacional
• Data: 2005

Autores

Rohrlack, T (Autor) Outra; Christoffersen, K (Autor) Outra; Dittmann, E (Autor) Outra; Nogueira, I (Autor) Outra; Vasconcelos, V (Autor) FCUP; Borner, T (Autor) Outra

Revista

Título: Limnology and Oceanography

Vol. 50

Páginas: 440-448

ISSN: 0024-3590

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 98 Citações

Scopus - 100 Citações

Classificação Científica

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

Outras Informações

ID Authenticus: P-000-4JX

DOI: 10.4319/lo.2005.50.2.0440

Abstract (EN): We investigated the intestinal uptake and adverse effects of microcystins ingested with Microcystis on Daphnia galeata. The gut structure, blood microcystin concentration, appearance, and movements of Daphnia fed Microcystis PCC 7806 or a microcystin-deficient PCC 7806 mutant were monitored over time. Microcystins were rapidly taken up from the digestive cavity into the blood. This process apparently required a preceding disruption of the gut epithelium by an as-yet-unknown Microcystis factor. Once microcystins entered the blood, they affected the neuromuscular communication or another life function that influences major muscle systems. Consequently, the beat rates of the thoracic legs, mandibles, and second antennae as well as the activity of the foregut decreased, whereas the midgut muscles were stimulated. Finally, the animals exhibited symptoms of exhaustion and died. The present results suggest that an ingestion of between 10.2 ng and 18.3 ng of microcystin per 1 mg of Daphnia body fresh weight is sufficient to kill D. galeata within 2 d.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9