Abundance and Altitudinal Distribution of Ephemeroptera in a Rocky Mountain Stream

  • James V. Ward
  • Lewis Berner


The nymphs of 29 species of Ephemeroptera representing six families were collected from rubble riffles in a Colorado stream system, from alpine tundra to the plains. Density ranged from 44 nymphs/m2 at the headwater site to 2,031 nymphs/m2 in the Foothills Limnological Zone. Heptageniidae comprised the majority of the mayflies at upstream sites and were numerically important at all but the plains location. Baetidae attained maximum diversity and relative abundance (62% of total mayflies) in the plains stream. Seven species of Ephemerella exhibited overlapping distribution patterns from 3109 m a.s.l to the plains.


Altitudinal Gradient Mountain Stream Altitudinal Range Altitudinal Distribution Stream Zonation 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • James V. Ward
    • 1
  • Lewis Berner
    • 1
    • 2
  1. 1.Department of Zoology and EntomologyColorado State UniversityFort CollinsUSA
  2. 2.Department of ZoologyUniversity of FloridaGainesvilleUSA

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