Streams, Lakes, Ponds |
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Page 63
... Predator - prey relationships come into the picture , too . One kind of organism may be consumed to a much greater ... predators . The law of the minimum is not actually violated under any of the conditions mentioned in the preceding ...
... Predator - prey relationships come into the picture , too . One kind of organism may be consumed to a much greater ... predators . The law of the minimum is not actually violated under any of the conditions mentioned in the preceding ...
Page 279
... predators . There is no gain in adding more fish ( the desirable predators ) if the balance is al- ready weighted on that side . The need here is to reduce the number of fishes in any practicable way or to increase the basic food supply ...
... predators . There is no gain in adding more fish ( the desirable predators ) if the balance is al- ready weighted on that side . The need here is to reduce the number of fishes in any practicable way or to increase the basic food supply ...
Page 282
... predators . Soon the growing number of predators quite outruns , relatively , the number of prey , to usher in the years of large numbers of ill - fed and small game fish . Under natural conditions it may be several years be- fore a ...
... predators . Soon the growing number of predators quite outruns , relatively , the number of prey , to usher in the years of large numbers of ill - fed and small game fish . Under natural conditions it may be several years be- fore a ...
Contents
Acknowledgment | 7 |
Distribution Circulation Stratification | 18 |
ΙΟ | 31 |
Copyright | |
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algae amount aquatic plants atmosphere back swimmers bacteria bass beetles biological body of water bottom brook brook trout calcium carbon dioxide carp chapter chemical Cladocera color copepods crustacea cycle Daphnia decomposition deeper water density depth diatoms dissolved oxygen dragonfly drifting effects eggs epilimnion feed fertilization fish flatworms flow food supply free oxygen fresh waters freshwater fungi gases gills greater green plants heat hypolimnion inch insect larvae insects kinds lake land larger larvae less light live materials mayflies microscopic midge larvae mussels natural waters nitrogen notably numbers nymphs occur odors organic matter oxidation parasites particular photosynthesis plankton plants and animals pollution pond populations predators prey production protozoa region relatively reservoir river rocks rotifers sewage shallow significant silt sludge worms snails soil solution sometimes species stenothermal stratification stream substances surface water swim temperature thermocline tion trout turbid water turbidity upper water wastes worms zone