Cyclidium glaucoma and Aeolosoma hemprichi, and Philodina erythrophthalma
supplemented the consumers and increased to maintain the system. As a functional
parameter, the amplitude of the DO damping as the concentration increased, along
with the activity of the system, indicated a tendency to decline slightly. However, all
systems were stable, with P/R ratios of ~1. The m-NOEC of Carbendazim, as a
fungicide, was detected within the range of 0.1–1 mg/L in the structural parameter
and as more than 10 mg/L in the functional parameter (Fig. 7.18).
7.4.5 Dimethoate
Dimethoate is organophosphorus pesticide that inhibits a nerve transduction system
(acetylcholinesterase (AChE) activity) necessary for transmitting information for the
life support of the pest and is mainly used for exterminating pests of fruit trees. The
addition concentration of Dimethoate was adjusted to 0.05, 0.1, 0.2, 0.5, 1.0, and
2.0 mg/L, and it was added on the 16th day of the stable state into the microcosm.
The endpoints were abundance (structural parameter) and the concentration of DO
(functional parameter), and the population was measured using an optical microscope and counted from the start of culturing on days 0, 2, 4, 7, 14, 16, 18, 20,
23, and 30; it was evaluated from the results of B 16–30 (days 16–30), which was the
ratio of abundance and population density (N 30 ) on the 30th day. The DO concentration was measured continuously from the 16th day, and the P/R ratio was
calculated from the amounts of production (P) and respiration (R).
Fig. 7.18 Time course of P/R ratio in Carbendazim-added microcosm N-system
7 Example Assessments of the Microcosm N-System
99
supplemented the consumers and increased to maintain the system. As a functional
parameter, the amplitude of the DO damping as the concentration increased, along
with the activity of the system, indicated a tendency to decline slightly. However, all
systems were stable, with P/R ratios of ~1. The m-NOEC of Carbendazim, as a
fungicide, was detected within the range of 0.1–1 mg/L in the structural parameter
and as more than 10 mg/L in the functional parameter (Fig. 7.18).
7.4.5 Dimethoate
Dimethoate is organophosphorus pesticide that inhibits a nerve transduction system
(acetylcholinesterase (AChE) activity) necessary for transmitting information for the
life support of the pest and is mainly used for exterminating pests of fruit trees. The
addition concentration of Dimethoate was adjusted to 0.05, 0.1, 0.2, 0.5, 1.0, and
2.0 mg/L, and it was added on the 16th day of the stable state into the microcosm.
The endpoints were abundance (structural parameter) and the concentration of DO
(functional parameter), and the population was measured using an optical microscope and counted from the start of culturing on days 0, 2, 4, 7, 14, 16, 18, 20,
23, and 30; it was evaluated from the results of B 16–30 (days 16–30), which was the
ratio of abundance and population density (N 30 ) on the 30th day. The DO concentration was measured continuously from the 16th day, and the P/R ratio was
calculated from the amounts of production (P) and respiration (R).
Fig. 7.18 Time course of P/R ratio in Carbendazim-added microcosm N-system
7 Example Assessments of the Microcosm N-System
99