Amphibian Egg Mass Surveys in Rock Creek Wetland

Rock Creek Wetland is the largest wetland complex in the municipal watershed. It provides an abundance of diverse habitat with water of varying levels. Beavers are very active in this wetland, so habitat in the complex is constantly changing. Fish are present, with the wetland providing excellent rearing habitat for coho salmon. Both red-legged frogs and northwestern salamanders bred consistently in the shallow water along the wetland margins from 2002 through 2012. However, in 2013, beaver had changed the wetland such that there was very little shallow water habitat, and no red-legged frog breeding was observed. Beaver continue to modify the wetland annually, and in both 2014 and 2015 some shallow water breeding habitat was available.

View full-sized graph >