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These spiders are Great Lakes guardians

from Great Lakes Echo

Scientists have discovered an environmental contaminant in a creature that many people would like to avoid: spiders. That discovery puts the spiders in the role of environmental sentinels — guardians that help scientists understand where to concentrate cleanup efforts. Their study, published last June in Environmental Toxicology and Chemistry, looked at a heavily polluted area of the Manistique River in the Upper Peninsula of Michigan. Scientists studied spiders there because of their place in the food web and their ability to accumulate PCBs (polychlorinated biphenyls) in measurable quantities without harm to themselves. more

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