Monday, November 20, 2006


The 5th graders from Harleyville-Ridgeville explored the world of macroinvertebrates along with their tour around the boardwalk. Macro (very large in scale; can see without a microscope) invertebrates (without backbones) are used to determine the general water quality here in the swamp. The image shows a dragonfly nymph, which is a predator of other macroinvertebrates.

Some organisms are pollution-intolerant, while others can literally swim in sewage. By taking an inventory of the organisms living in the swamp and determining the percentage of pollution-intolerant to pollution-tolerant species, we can determine the general water quality. The water in Four Holes Swamp is exceptional! If changes occur, we can detect them quickly and look upstream for the cause.

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