Table 3. Population size estimates (number of individuals), and 

 percentage of pond occupied, for 2 6 Hovellia aquatilis 

 occurrences, Swan River Valley, Montana (1987, 1989, 

 1990) . 



• - Poods whose margins or immediate surroundings have been physically impacted by timber harvesting. 

 Observations at selected sites (1990). 



# - High cover of Carex vesicaria . 



tr - High cover of Nuphar variegatum and Carex vesicaria . 



<r - No apparent cause for lack of plants. 



4 



* - Oily scum on surface, water deep reddish-yellow to brown, possible dumping from road or 



decaying leaves. 



dr - Heavy algal bloom. 



M - Dead sedges and cat-tails, water level appears high. 



U - High cover of Lemna minor . 



