07/31/2013 Env Bd Packet - Laserfiche WebLink

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• • • 674 ■ Ephemeroptera ■ Plecoptera ▪ Tricoptera ■ Diptera 1 Coleoptera ■ ©hgochaeta r Other Rice Creek `Above' Data Summary Family Biotic Index (FBI): Our 2012 SHEP field sampling results produced a score of 8.3 for the Rice Creek `Above' site. This score corresponds to a "Very Poor" rating on the Family Biotic Index stream health chart. The FBI has declined. The dominating family in 2012 has a higher tolerance to pollution to that of 2011, which lowered the FBI average. In addition, the diversity declined in 2012, which included fewer families with low tolerance values. Number of individuals: A large sample offers more confidence for a more reliable data set. SHEP protocol requires a minimum of 100 individual invertebrates to be picked and identified per sample. 174 invertebrates were identified in this sample. This sample size is adequate. Dominant Family: The dominant family was Coengrionidae (damselfly). Coengrionidae dominated 52.9% of the sample, and has a tolerance value of 9 on a scale of 0 -10 (the lower the tolerance value, the lower their tolerance to pollution). Narrow- winged damselflies, or pond damselflies, are most commonly found on vegetation around the perimeter of lakes and wetlands; however, some species are found on rocks and vegetation in streams. They prefer dense vegetation. Coengrionidaes are the most common damselfly family. (Guide to Aquatic Invertebrates of the Upper Midwest, R.W. Bouchard, Jr). They are predators and prey on mosquito larva. They use their tails for breathing. (Aquatic Entomology, McCafferty, W.P). Number. of Families: In 2012, 10 families were identified in the sample. This compares to 15 families in 2011 and 11 families in 2010. In general, a more diverse sample suggests a healthier stream environment. EPT: Ephemeroptera- Plecoptera - Tricoptera (Mayfly - Stonefly - Caddisfly) are three Orders of invertebrates with low tolerance to pollution. The more of these families in a sample, the better. More than 10 -12 families is considered good. In 2012, 4 EPT families were identified in the sample and made up 8% of the sample.