By John D. Wehr, Robert G. Sheath, J. Patrick Kociolek
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Extra resources for Freshwater Algae of North America: Ecology and Classification (Aquatic Ecology)
However, a study of arctic, temperate, and tropical lakes using stable isotopes suggests that previous efforts may have underestimated the importance of algae in benthic food webs (Hecky and Hesslein, 1995). Prior studies were based on net production of phytoplankton, benthic algae, and macrophytes, instead of ease of grazing, edibility, or nutritional quality; all of these qualities were predicted to be greatest in benthic algae. , 1995). In one neutral lake, tadpoles suppressed the growth of filamentous algae on tiles, and favored communities of adherent and encrusting species (Coleochaete scutata, Achnanidium minutissimum); grazers had no such effects on epilithic communities in acidified lakes (Graham and Vinebrooke, 1998).
G. Sheath; photo D by R. J. Cannings; photo E by P. R. Leavitt, reproduced with permission; photo F by J. D. Wehr. New York (Fig. 1C), which are elongate, radially arranged basins that range from small ponds to large lakes, such as Seneca (175 km2 area, 188 m depth; Hutchinson, 1957; Berg, 1963). However, most glacially formed lakes are small kettles scattered across the continent (Fig. 1D and E). Glacial scouring in mountainous terrain may form deep amphitheater-like cirques (Fig. , 1995). Glacial basins within narrow valleys may form deep fjord lakes (Fig.
Wehr. Cole, 1994). Many are now filled, but those with aquatic habitats are shallow and have extensive macrophyte beds and low algal production (Schalles and Shure, 1989). C. Lake Community Structure and Productivity 1. Lake Zones and Thermal Patterns Regions within lakes exhibit physical and chemical differences that affect algal communities. The open water region of lakes is termed the pelagic (or limnetic) zone, whereas close to shore is the littoral zone, where the greatest exchange between nutrient-rich sediments and the water occurs (Fig.