Abstract：
:Three related amides (diuron, 2-(octyloxy) acetanilide, and salicylanilide) were evaluated for toxicity to aquatic microcosm communities. Effects were measured at the ecosystem level using changes in pH, Eh (redox potential), and dissolved oxygen as indicators of toxicity. These values were used to calculate the resistance, resilience, and relative instability of the microecosystems to each compound at comparable dose levels of approximately 2500 micrograms/liter. Such measures have often been used in a theoretical context, but have not received wide practical application. The systems showed low resistance and no resilience to diuron, high resistance and low resilience to 2-(octyloxy) acetanilide, and no response to salicylanilide. At a higher exposure level (9800 micrograms/liter salicylanilide), the systems showed low resistance and high resilience. Both this approach and more traditional dose-response measures of toxicity indicated that diuron was clearly the most toxic compound, followed by 2-(octyloxy) acetanilide and salicylanilide. While microcosm toxicity tests were slightly less sensitive than some single species tests, they provided important additional information on the extent of perturbations and the rate of ecosystem recovery.
journal_name
Ecotoxicol Environ Safjournal_title
Ecotoxicology and environmental safetyauthors
Flum TF,Shannon LJdoi
10.1016/0147-6513(87)90012-1subject
Has Abstractpub_date
1987-04-01 00:00:00pages
239-52issue
2eissn
0147-6513issn
1090-2414pii
0147-6513(87)90012-1journal_volume
13pub_type
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