Abstract
ABSTRACT Aquatic invertebrates were sampled from three abundant species of macrophytes: in Presque Isle Bay, Lake Erie. Samples were taken from Richardson pondweed (Potamogeton richardsonii), which is native to Presque Isle Bay, and from Eurasian watermilfoil (Myriophyllum spicatum) and curly-leaf pondweed (Potamogeton crispus), which are invasive plants. One-way analysis of variance showed significant differences (F = 82.51, P < 0.0001) in invertebrate density among macrophyte species. The greatest mean density was found on P. crispus (7,640 organisms/m2). Mean invertebrate density on P. richardsonii (3,660 organisms/m2) and on M. spicatum (3,378 organisms/m2) were not significantly different from one another. The primary reason for the greater density on P. crispus was very high densities of the annelid Stylaria lacustris. Invertebrate richness was highest on P. richardsonii with 19 genera present followed closely by M. spicatum with 18 genera, and the lowest richness occurred on P. crispus, which contained 14 genera. The most abundant group of invertebrates collected from P. richardsonii and P. crisp was annelids whereas the most abundant group of organisms collected from M spicatum was arthropods.
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