Concordance of taxonomic richness patterns across multiple assemblages in lakes of the northeastern United States

Authors:
  • TWThomas R. Whittier
    Thomas R. Whittier
  • PKPhilip R. Kaufmann
    Philip R. Kaufmann
  • DLDavid P. Larsen
    David P. Larsen
  • RORaymond J. O'COnnor
    Raymond J. O'COnnor
  • RHRobert M. Hughes
    Robert M. Hughes
  • RSRichard S. Stemberger
    Richard S. Stemberger
  • SDSushil S. Dixit
    Sushil S. Dixit
  • RBRalph O. Brinkhurst
    Ralph O. Brinkhurst
  • SPSteven G. Paulsen
    Steven G. Paulsen
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Abstract
We investigated the concordance of taxonomic richness patterns and their environmental correlates for assemblages of benthic macroinvertebrates, riparian birds, sedimentary diatoms, fish, planktonic crustaceans, and planktonic rotifers in 186 northeastern U.S. lakes. Taxon counts were standardized with respect to sampling effort using rarefaction. The degree of concordance among assemblage richness measures was low, but this was at least partly attributable to measurement precision. Aspects of lake morphology (area, depth) superseded other environmental features (climate, human development, water chemistry, nearshore physical habitat) as correlates of assemblage richness and were the strongest source of concordance. The benthic macroinvertebrates, birds, fish, and zooplankton all showed positive associations between richness and lake area. The diatoms showed negligible associations between richness and area and negative associations between richness and depth. Associations with human development were much weaker than with lake morphology and varied from positive (fish, planktonic crustaceans) to negative (diatoms). We conclude that taxonomic richness alone may be of ambiguous value as an indicator of biological integrity in lakes and that its natural drivers must be controlled for prior to assessing anthropogenic effects. Résumé : Nous avons étudié la concordance de profils de diversité taxonomique avec leurs corrélats environnementaux chez des groupements de macroinvertébrés benthiques, d'oiseaux de rivage, de diatomées sédimentaires, de poissons et de crustacés et de rotifères planctoniques dans 186 lacs du nord-est des États-Unis. Nous avons normalisé les