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Nasri, H., El Herry, S., & Bouaïcha, N. (2008). First reported case of turtle deaths during a toxic microcystis spp. bloom in lake oubeira, algeria. Ecotoxicology and environmental safety, 71(2), 535–544.
Added by: Admin (14 Aug 2008 20:34:34 UTC) Last edited by: Beate Pfau (28 Jun 2009 06:31:12 UTC) |
| Resource type: Journal Article DOI: 10.1016/j.ecoenv.2007.12.009 BibTeX citation key: Nasri2008a View all bibliographic details  |
Categories: General Keywords: Emydidae, Emys, Emys orbicularis, Geoemydidae, Habitat = habitat, Mauremys, Mauremys leprosa, Nordafrika = Northern Africa, Schildkröten = turtles + tortoises, Toxikologie = toxicology Creators: Bouaïcha, El Herry, Nasri Collection: Ecotoxicology and environmental safety |
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| Abstract |
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Microcystins analysis was conducted in field cyanobacterial bloom samples and dead terrapin tissues from Lake Oubeira (Algeria) with an aim of studying the cause of the mortality of the freshwater terrapin species Emys orbicularis and Mauremys leprosa during October 2005. The deaths of these two terrapin species were observed during a bloom of Microcystis spp. The total microcystin content per phytoplankton biomass evaluated with the methanol extraction-protein phosphatase methodology was 1.12mg MCYST-LR equivalents/g dried bloom material. The analysis of this bloom extract by the LC/MS technique demonstrated the presence of three microcystin variants: microcystin-LR (MCYST-LR), microcystin-YR (MCYST-YR), and microcystin-RR (MCYST-RR). Microcystins were also detected in fresh carcasses of terrapin liver, viscera and muscle tissues using the GC/MS after Lemieux oxidation method and the PP2A inhibition assay. The high level of microcystins detected using the Lemieux oxidation-GC/MS method in the liver tissue (1192.8mug MCYST-LR equivalent/g dw) and in the viscera tissue (37.19mug MCYST-LR equivalent/g dw) of the species M. leprosa and E. orbicularis, respectively, and the liver crumbling observed after the necropsy examination of the fresh carcass of M. leprosa support the possibility that cyanobacterial microcystins contribute to the turtle mortalities.
Added by: Admin Last edited by: Beate Pfau |