Abstract
ABSTRACT An extensive survey was conducted in fall 1978 to determine the distribution and abundance of submersed macrophytes through the St. Clair-Detroit River system from Lake Huron to Lake Erie. Submersed macrophytes, representing 19 taxa, were widely distributed in the system, being found on 358 km2 (30%) of the total 1185 km2 of substrate surveyed. Of the 19 taxa identified, 8 common taxa were found on 20 to 121 km2 of substrate. These commonly found taxa, in decreasing order of substrate coverage were Characeae, Vallisneria americana, Najas flexilis, Myriophyllum spicatum, Elodea canadensis, Potamogeton richardsonii, Potamogeton spp. (narrow-leaf forms), and Heteranthera dubia. In general, macrophyte beds of low, medium, and high biomass covered much less area but a higher proportion of the available substrate in the St. Clair and Detroit rivers than in Lake St. Clair.
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