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Freshwater Invertebrates of the United States
  • 1,169
  • 36
Diurnal Movements of Zooplankton Organisms in Some Colorado Mountain Lakes
About seventy years have elapsed since the pioneer observations were made which established the fact that populations of certain marine and fresh-water zooplankton organisms move vertically towardExpand
  • 61
  • 5
Annual Limnological Cycles in Some Colorado Reservoir Lakes
  • R. Pennak
  • Environmental Science
  • 1 February 1949
  • 62
  • 3
Species Composition of Limnetic Zooplankton Communities1
The species composition of limnetic zooplankton communities in 27 Colorado lakes has been determined on the basis of 148 vertical series of plankton-trap samples. Each such series consisted of threeExpand
  • 125
  • 2
Some Evidence for Aquatic Macrophytes as Repellents for a Limnetic Species of Daphnia
Under controlled laboratory conditions Daphnia rosea SARS is strongly repelled by substances secreted by Elodea, Nitella, and Myriophyllum. This phenomenon can be easily demonstrated in a large glassExpand
  • 89
  • 2