The effects of toxicants on planktonic systems: an integrated approach using the analysis of size distributions
Tóm tắt
We measured size distributions in model wetlands to detect stressor effects at the community level. Two experiments investigated the individual and combined effects of methyl mercury, chlorpyrifos, atrazine, monosodium methane arsonate, and UV-B light on the system. The statistical analysis of the metric using size distributions, which integrated information about organisms 0.2–4750 µm in size, detected effects in the planktonic community. Effects were found in both experiments, but only when methyl mercury was present in the treatment structure, indicating that system level effects are most likely with broad spectrum or persistent toxicants. Methyl mercury negatively affected most size classes measured in both experiments. A methyl mercury × chlorpyrifos interaction was detected which shifted the size distribution to larger organisms more than expected, but the interaction effect was much smaller than the effect of methyl mercury alone.
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