Data on the fish communities in Big Bayou and Little Bayou creeks downstream of PGDP were compared to data on fish communities from reference sites located in Big Bayou Creek above PGDP (BBK 12.5) and on Massac Creek (MAK 13.8). These comparisons indicated a slight but noticeable degradation in the communities downstream of PGDP.
|Effects on the fish communities in Big Bayou Creek were greatest just downstream from PGDP at BBK 10.0 (Figure 1). At this site, species richness was consistently below reference values. Biomass and density often exceeded reference values due to the dominance of a few species, a pattern that suggest nutrient enrichment.|
|In Little Bayou Creek impacts from PGDP operations were more minor, with species richness being similar to values at reference sites. There was a general decline in density at LUK 7.2 during the 1991 to 1998 monitoring period (Figure 2).|
Figure 1. Fish community data for Big Bayou Creek (BBK 9.1 and 10.0) and reference sites (MAK 13.8 and BBK 12.5). BBK = Big Bayou Creek kilometer; MAK = Massac Creek kilometer.
Figure 2. Fish community data for Little Bayou Creek (LUK 7.2) and reference sites (MAK 13.8 and BBK 12.5). LUK = Little Bayou Creek kilometer; BBK = Big Bayou Creek kilometer; MAK = Massac Creek kilometer.
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