. Bulletin. Natural history; Natural history. Aug. 1981 Moran: Aquatic Macrophytes 407 lake, Station L4. This again was probably the result of stress by the wind and wave action in the area. The highest biomasses, and g/m2 were recorded from Station L2 in the discharge canal. In the intake arm, stations L7, LB, and L9, the mean biomass of g/m^ was only 50 percent of that of the discharge arm. POTAMOGETON NODOSUS IN LAKE SANGCHRIS Potamogeton nodosus is common in Lake Sangchris, with a lakewide distribution in depths of 2 m or less. It is considered an alkophile, usually occur
. Bulletin. Natural history; Natural history. Aug. 1981 Moran: Aquatic Macrophytes 407 lake, Station L4. This again was probably the result of stress by the wind and wave action in the area. The highest biomasses, and g/m2 were recorded from Station L2 in the discharge canal. In the intake arm, stations L7, LB, and L9, the mean biomass of g/m^ was only 50 percent of that of the discharge arm. POTAMOGETON NODOSUS IN LAKE SANGCHRIS Potamogeton nodosus is common in Lake Sangchris, with a lakewide distribution in depths of 2 m or less. It is considered an alkophile, usually occurring in water with a pH range of and alkalinities of 49-380 mg HCO3/I (Moyle 1945). In 1971 P. nodosus was chiefly confined to a rather small area south of Station A (Fig. 9). In 1973 it extended southward down all three arms and northward to the dam. By 1976 it had occupied the entire cooling loop and control arm. The most important factor in the spread of P. nodosus in Lake Sangchris appeared to be the currents in the cooling loop. In Lake Sangchris, P. nodosus has shown some morphological and physiological variations in response to the microclimatic variations within the lake. Growth rates in most of the lake appeared similar, but were accelerated in the southern (warmest) reaches of the discharge arm. On 28 April 1976, a bed at the mouth of the discharge canal was producing flower spikes, while a bed at the end of the discharge arm (about 400 m north of Station 4) had only a few leaves breaking the surface, and plants in the rest of the lake had not yet reached the surface. By 26 May 1976 plants in the discharge canal had set fruit, while plants. Fig. 9 —Distribution of Potamogeton nodosus in Lake Sangchris. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History S
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