Freshwater Algae of North America: Ecology and Classification (Aquatic Ecology)

Freshwater Algae of North America: Ecology and Classification (Aquatic Ecology)

Language: English

Pages: 917

ISBN: 0127415505

Format: PDF / Kindle (mobi) / ePub


Freshwater algae are among the most diverse and ubiquitous organisms on earth. They occupy an enormous range of ecological conditions from lakes and rivers to acidic peat swamps, inland saline lakes, snow and ice, damp soils, wetlands, desert soils, wastewater treatment plants, and are symbionts in and on many plants, fungi, and animals. In North America, the variety of freshwater habitats colonized by algae is very rich, and offers an enormous and fascinating range of environments for their study. They form the base of most aquatic food webs and are critical to studies of ecosystem health. Algal ecologists and taxonomists play an important role in the understanding of aquatic ecosystems: their biodiversity, productivity, interactions with other organisms, and water quality. This book provides in one volume a practical and comprehensive guide to the genera of freshwater algae known from North America. The format combines the necessary ecological, taxonomic and methodological information for all scientists working in aquatic environments, whether their specialty is in environmental monitoring and water quality assessment, biological composition, ecology, evolution, or molecular biology.

Key Features
* The first complete accounting of North America's freshwater algal genera in more than 50 years
* Includes a guide to the current literature on species identification in each group of algae
* High-quality photographs and drawings of more than 770 genera
* A clear, easy-to-use introductory key to the diagnostic chapters
* Synthetic chapters on freshwater habitats, use of algae in environmental assessment, and control of nuisance algae
* Contributions from 27 experts in all areas of freshwater algae
* Extensive literature citations
* Companion volume of Ecology and Classification of North American Freshwater Invertebrates 2nd edition, edited by Throp and Covich

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sheaths. Sheaths are thick, firm, lamellated, and usually colored, red, reddish brown, purple, yellow, yellow–brown; they are rarely colorless. Young filaments have attenuated ends with closed sheaths; old sheaths have open ends, often characteristically widened or coiled and modified after fragmentation and hormogonia release. Trichomes are nonmotile, 6–10 μm wide, and constricted or not constricted at the cross walls. Cells are isodiametric or longer than wide. Apical cells are usually rounded

Vorticella sp.; Canter-Lund and Lund, 1995). Few species live in the metaphyton of small temperate water bodies in tropical and subtropical regions. Several species were reported from Midwestern or higher conductivity U.S. reservoirs (Tilden, 1910; Smith, 1950; Whitford and Schumacher, 1969). This genus is rare in low-conductivity, low-nutrient boreal waters and apparently absent from arctic and subarctic waters (Duthie and Socha, 1976; Sheath and Steinman, 1982). However, species of the genus

tenue; lesser abundances of Chlorella spp., Nitzschia palea, Oedogonium sp., Oscillatoria spp., Pleurocapsa minor, Pseudanabaena catenata, Scenedesmus quadricauda, and Tribonema spp. also are observed (Palmer, 1962; Sládecková et al., 1983; Davis et al., 1990a). Communities exhibit seasonal changes in composition: Tribonema dominates in the spring, and Oscillatoria, Scenedesmus, and Stigeoclonium reach their maxima in warmer months. These shifts are largely driven by changes in light and

D., Tubbing, D. M. J. 1993. A model of phytoplankton production 46 John D. Wehr and Robert G. Sheath in the lower River Rhine verified by observed changes in silicate concentration. Journal of Plankton Research 15:659–682. Admiraal, W., Breebaart, L., Tubbing, G. M. J., Van Zanten, B., de Ruijter van Steveninck, E. D., Bijerk, R. 1994. Seasonal variation in composition and production of planktonic communities in the lower River Rhine. Freshwater Biology 32:519–531. Ahmadjian, V. 1993. The

1–6(11) μm in diameter, and have no obvious gas vesicles. Cell division occurs regularly in three perpendicular planes in successive generations. Daughter cells more or less keep their position in a colony. Reproduction is by disintegration of colonies. Eight species and several varieties have been described. The often are metaphytic in swamps and bogs, but also are found in volcanic soils (Komárek and Hindák, 1989; Komárek and Anagnostidis, 1998). E. minor and E. alpina are found in peaty

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