we sampled at 13 stations in 2001 and additional two stations in 2002-07 for a total of 15 stations. Note that while stations are numbered 1-16, there is station 4 because although originally included in the sample plan, station 4 was eliminated shortly after sampling was initiated for this study. We have chosen not to renumber the stations for continuity with other long-term data sets that utilize these same stations. Sampling typically took place over the course of 2 days, except in cases when severe weather cut short or postponed sampling. In these cases, the sampling cycle would generally be completed within 4 days.