Cyanobacteria and cyanotoxins at the river-estuarine transition.

Autor: Bukaveckas PA; Virginia Commonwealth University, Department of Biology and Center for Environmental Studies, United States. Electronic address: pabukaveckas@vcu.edu., Franklin R; Virginia Commonwealth University, Department of Biology and Center for Environmental Studies, United States., Tassone S; Virginia Commonwealth University, Department of Biology and Center for Environmental Studies, United States., Trache B; Virginia Commonwealth University, Department of Biology and Center for Environmental Studies, United States., Egerton T; Virginia Department of Health, United States.
Jazyk: angličtina
Zdroj: Harmful algae [Harmful Algae] 2018 Jun; Vol. 76, pp. 11-21.
DOI: 10.1016/j.hal.2018.04.012
Abstrakt: We examined seasonal and longitudinal patterns in the occurrence of toxic cyanobacteria in the James River Estuary (Virginia). Highest chlorophyll and cyanobacteria levels were observed in the tidal freshwater segment, particularly during dry summers when freshwater replacement time was long. Cyanobacteria accounted for a small proportion of phytoplankton biomass (7-15%), and Microcystis comprised a small proportion of the cyanobacteria (<1%). Despite this, measureable levels of microcystin were commonly observed in water (>85% of samples in July, August and September), fish tissues (87% of planktivorous fishes) and shellfish (83% of individuals). Generic indicators of algal blooms (chlorophyll and algal biomass) had limited utility for predicting microcystin concentrations. However, chlorophyll was found to be a useful predictor for the probability of exceeding specific toxin thresholds. Tissue microcystin concentrations were highest in fish and shellfish collected from the tidal fresh segment, but were detectable in biota collected from the oligohaline at distances 50 km seaward.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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