There was no significant difference between the three regions with respect to the abundance of chironomids and oligochaetes. The abundance of zebra mussels, isopods, gastropods, turbellarians, and amphipods were significantly different with higher numbers found in the Tannery Bay stations. As in October, groups most closely associated with aquatic plants or the sediment surface were more abundant in Region 1. The exception were Oligochaetes, which were infaunal forms. In Three Regions In White Lake, April 1997.
Values given are the P-levels.
43 0.014 polymorpha 4.4.1 Comparison Of Benthic Macroinvertebrate And Sediment Toxicity Data Populations of Hyalella sp. This discrepancy can be explained by sampling bias and environmental factors. However, most of the benthic macroinvertebrate community only occupies the top 2 cm of the sediment. I-5M would expose organisms to higher contaminant levels in the toxicity test than in the actual environment. The large population of Hyalella sp.