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Estimation of production and sedimentation of cyanobacterial toxins (microcystin) based on nutrient budgets in the reservoir of Isahaya Bay, Japan.
Umehara, Akira; Komorita, Tomohiro; Takahashi, Tohru; Tsutsumi, Hiroaki.
Afiliación
  • Umehara A; Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto, 862-8502, Japan. Electronic address: umehara84@gmail.com.
  • Komorita T; Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto, 862-8502, Japan.
  • Takahashi T; Department of Medical Technology, Kumamoto Health Science University, 325 Izumi-machi, Kumamoto, 861-5598, Japan.
  • Tsutsumi H; Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Kumamoto, 862-8502, Japan.
Ecotoxicol Environ Saf ; 183: 109477, 2019 Nov 15.
Article en En | MEDLINE | ID: mdl-31369939
The increasing eutrophication of freshwater and brackish habitats globally has led to a corresponding increase in the occurrence of harmful cyanobacterial blooms. Cyanobacteria can produce highly toxic substances such as microcystins (MCs) that affect the health of livestock, wildlife, and humans. The present study broaden the understanding of cyanobacteria ecology and MC dynamics in the field, focusing on the estimation of the production and sedimentation rates of MCs in a natural habitat. The nutrient concentrations of the reservoir water and sediment pore water were monitored at 3-h intervals for 24 h during the summer cyanobacterial bloom. The DIN uptake rate of Microcystis in the Isahaya reservoir was estimated and the large-scale blooms in the reservoir were largely controlled by the interactions between rainfall and nutrient levels in the warm season. By using calculations based on the nitrogen budgets and tracking changes of the MC concentrations in the water column, the total MC production and sedimentation rates were estimated to be 52.2 kg MCs d-1 and 21.5 kg MCs d-1, respectively. Although MCs could be degraded in the environment, the MC sedimentation still comprised 41% of the in-water production.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Toxinas Bacterianas / Bahías / Microcistinas / Toxinas Marinas Tipo de estudio: Health_economic_evaluation País/Región como asunto: Asia Idioma: En Revista: Ecotoxicol Environ Saf Año: 2019 Tipo del documento: Article Pais de publicación: Países Bajos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Toxinas Bacterianas / Bahías / Microcistinas / Toxinas Marinas Tipo de estudio: Health_economic_evaluation País/Región como asunto: Asia Idioma: En Revista: Ecotoxicol Environ Saf Año: 2019 Tipo del documento: Article Pais de publicación: Países Bajos