The Ecology of Running WatersFor advanced students. |
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Page 70
... winter flora is dominated by diatoms , or sometimes by Hydrurus , and the summer flora by Chlorophyceae , Cyanophyta , and Rhodophyta ; light is therefore certainly involved ( Gessner , 19556 ) . We have virtually no information on ...
... winter flora is dominated by diatoms , or sometimes by Hydrurus , and the summer flora by Chlorophyceae , Cyanophyta , and Rhodophyta ; light is therefore certainly involved ( Gessner , 19556 ) . We have virtually no information on ...
Page 71
... winter species is Gomphonema olivaceum . These two are often considered to form a winter association , but as Blum ( 19546 ) has pointed out their seasons do not coincide exactly and they are really in competition . Diatoma appears ...
... winter species is Gomphonema olivaceum . These two are often considered to form a winter association , but as Blum ( 19546 ) has pointed out their seasons do not coincide exactly and they are really in competition . Diatoma appears ...
Page 296
... winter Plecop Ptera Capnia Pycnopsyche Chitonophora . PERACARIDA & MOLLUSCA uni- & multivoltine cycles summer autumn winter spring summer autumn FIG . XIV , 4. A diagrammatic presentation of : Above . Some unusual life cycles found in ...
... winter Plecop Ptera Capnia Pycnopsyche Chitonophora . PERACARIDA & MOLLUSCA uni- & multivoltine cycles summer autumn winter spring summer autumn FIG . XIV , 4. A diagrammatic presentation of : Above . Some unusual life cycles found in ...
Contents
Water flow and stream channels I | 1 |
Physical characteristics of flowing water | 28 |
Chemical characteristics of flowing water | 36 |
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abundant adults Africa algae amount amphipods animals aquatic areas Baetis benthic benthos biological biomass breeding brown trout caddis-worms carbon cent channel Chironomidae cm./sec Creek current speed cycles cyprinids darters detritus diatoms Diptera discharge downstream drift ecology effect eggs emergence Ephemerella Ephemeroptera Europe factor fairly fauna feed fish flow freshwater Gammarus genera genus Gessner gravel growth habitat hatch Hydropsyche Hynes important increase insects invertebrates lakes large numbers larvae less Limnol live mayflies Minckley move normal North America number of species numbers nymphs observed occur Oligochaeta organic matter oxygen particles period periphyton plankton plants Plecoptera populations probably production Rhithrogena rhithron riffles rivers and streams rotifers running water running-water salmon samples sand season seen Shadin shown silt similar Similarly Simuliidae Simulium small streams snails specimens spring stoneflies stones stony stream bed stream-dwelling substrata substratum summer surface Table temperature tend Trichoptera trout types upstream varies VIII winter