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THE PRACTICAL IMPORTANCE OF SUCCESSIONAL
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Abundant Populations Africa amphipod aquatic Arianta arbustorum arise bilharzia snails biological Biomphalaria Bithynia tentaculata chemical climax community contortus copepods dangerous snails dangerous species Demy 8vo destruction diverse drainage ecological processes ECOLOGICAL SUCCESSION ecotone environment environmental equilibrium example factors field flooding follows fresh-water molluscs Glyceria H. K. Lewis habitat human important instances irrigation canals kind lakes large number Liver-fluke Snails Lymncea palustris Lymncea stagnalis Lymncea truncatula metabolic rate migration molluscan fauna molluscicide Mozley natural populations northern number of individuals occupied occur perennially periods pest organisms Phragmites Physa fontinalis Physopsis globosa Pisidium Pisidium personatum Planorbis Planorbis planorbis plants and animals ponds possible present rats reactions reed-swamp regard rejuvenated result River schistosomiasis season secondary succession sere Sites of Infection situation small number snail population species of snails stages successional changes temperature terrestrial species tion Valvata Valvata cristata vegetation Wheatfen workers Zonitoides nitidus