AI Article Synopsis
- The study examined changes in Microcystis species and microcystin levels in Lake Biwa's Northern Basin over three years (1998-2000), focusing on seasonal variations and specific sites.
- Station 1 (Nagahama Bay) displayed the highest microcystin concentrations during summer and fall, peaking at 35.9 µg L(-1) in October 1999.
- Eleven cyanobacteria species were found, with M. aeruginosa and M. wesenbergii being the most significant; microcystin levels were primarily linked to the amount of toxic M. aeruginosa rather than the overall Microcystis count.
Article Abstract
Spatial and temporal variation in Microcystis species composition and microcystin concentration, quantified by enzyme-linked immunosorbent assay and high-performance liquid chromatography, were investigated during a 3-year period (1998-2000) in the Northern Basin of Lake Biwa. The Northern Basin generally had a concentration of 5 microg L(-1) or less, except at station 1 (Nagahama Bay) from July to October during the study period. The maximum concentration at station 1 was 22.7, 35.9, and 22.0 microg L(-1) in October of 1998, 1999, and 2000, respectively. Eleven species of cyanobacteria were observed: Microcystis aeruginosa, M. ichthyoblabe, M. novacekii, M. wesenbergii, Oscillatoria raciborskii, Anabaena oumiana, A. affinis, A. flos-aquae, A. ucrainica, A. smithii, and A. crassa. Of these, M. aeruginosa and M. wesenbergii were the main components observed. A high concentration of microcystin in the lake water was mostly a result of variation in the relative amount of toxic M. aeruginosa rather than of the total Microcystis cell number. This was supported by the analytical results for isolated strains. Microcystis spp. cell density in the Northern Basin appeared to increase gradually over the course of the study. This is the first study to have surveyed the Northern Basin of Lake Biwa, which supplies drinking water to 14 million people and is the largest lake in Japan.
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| http://dx.doi.org/10.1002/tox.20117 | DOI Listing |
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