Tag Archive: rusty crayfish

Mar 12

Native and Invasive Crayfish Square Off

Non-native crayfish upset the natural balance in streams: Crayfish are an important part of the food web in streams. But in Pennsylvania, an invasive species called rusty crayfish is taking over. And in some areas, they’re so dense they stack on top of each other. Dave Lieb with the Western Pennsylvania Conservancy says rusty crayfish …

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