Freshwater Algae of North America Ecology and Classification by Wehr, Steath

By Wehr, Steath

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Amictic lakes, uncommon in North America (some in Greenland; common in the Antarctic), are perennially ice covered and do not turn over. A special class of lakes in which upper waters (mixolimnion) mix, but deeper waters (monimolimnion) never circulate, are termed meromictic (Wetzel, 1983a). These lakes have a very stable chemical and temperature density gradient, known as a chemocline, that results in anoxic conditions, H2S, and purple sulfur bacteria in 2. Freshwater Habitats of Algae the water column.

The floodplain includes portions of the watershed (tributaries, adjacent wetlands, flood- FIGURE 10 Structure of tributaries in a watershed, indicating numbering of stream orders. 30 John D. Wehr and Robert G. Sheath plain lakes, riparian zones) that are seasonally inundated during periods of high flow. Meandering rivers and those with more islands have greater littoral and floodplain interaction, and more complex and varied current regimes than rivers with less sinuous courses (Fig. 11A and B).

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. 6). , Chara, Nitella, and Batrachospermum) and nonflower- ing plants (mosses, liverworts) also occur (Hutchinson, 1975). Vertical zones also develop in temperate regions.

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