Insect mine lake contaminants.Many winged insects spend their early life at the bottom of a lake, feeding in or near sediment. As they mature and fly away -- often to become dinner for birds, amphibians amphibians members of the animal class Amphibia. Includes frogs, toads, newts, salamanders and cecilians all capable of living on land or in water. , or bats -- they can transport back into the food chain pollutants pollutants see environmental pollution. formerly locked away in sediment, a new study shows. Canadian researchers deposited tetrachlorodibenzofuran (TCDF TCDF Tetrachlorodibenzofuran ) -- a dioxin-like chemical -- into 5-meter-diameter tubes anchored in shallow lake water. TCDF levels in mature bugs leaving the tubes over succeeding weeks were compared to those of insects from tubes with no added TCDF. The data indicate that insects from even a relatively unproductive northern lake can remove "a small [about 1 percent] but biologically significant portion" from sediments each year, report Wayne L. Fairchild and his co-workers at the Freshwater Institute in Winnipeg, Manitoba. Moreover, they write in the June Environmental Toxicology toxicology, study of poisons, or toxins, from the standpoint of detection, isolation, identification, and determination of their effects on the human body. Toxicology may be considered the branch of pharmacology devoted to the study of the poisonous effects of drugs. And Chemistry, these totals don't count the contribution of insects too big for effective trapping trapping, most broadly, the use of mechanical or deceptive devices to capture, kill, or injure animals. It may be applied to the practice of using birdlime to capture birds, lobster pots to trap lobsters, and seines to catch fish. , such as mayflies and dragonflies. |
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