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The effect of 2,5,2′,5′‐tetrachlorobiphenyl on growth and death of the cyanobacterium Anabaena flos‐aquae
Author(s) -
Lee DaeYoung,
Rhee GYull
Publication year - 2001
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620201009
Subject(s) - anabaena , heterocyst , population , zoology , biology , cyanobacteria , botany , chemistry , bacteria , genetics , demography , sociology
The effect of 2,5,2′,5′‐tetrachlorobiphenyl (TcBP) on cell death was investigated in the cyanobacterium Anabaena flosaquae (Lyngb.) Bréb grown in a P‐limited, semicontinuous culture under N 2 ‐fixing conditions during a 17‐d period. The TcBP was supplied daily to yield final concentrations of 1, 10, and 100 ppb (or ng/ml). At 1 and 10 ppb, the population size of live cells (sum of live vegetative cells and live heterocysts) was not different from that of the TcBP‐free controls ( p > 0.1, t test) and remained constant both in its absolute value (9.6 × 10 5 cells/ml) and as a percentage of the total population (98.6%). However, at 100 ppb, the population size of live cells declined significantly after the 11th day (8.2 × 10 5 cells/ml, or 96.6% of total population; p < 0.01, t test). The decrease in viable cells was mostly found in vegetative cells. Bioconcentration factor in the cell ([pg TcBP/g dry wt cells]/[pg TcBP/ml]) was 1.23 × 10 5 .