Effects of simulated grazing on different genotypes of Bouteloua gracilis: How important is morphology?

Peter M. Kotanen, Joy Bergelson

Research output: Contribution to journalArticlepeer-review


Populations of grasses exposed to grazing by vertebrates often exhibit reduced stature, increased tillering, reduced flowering, and other morphological differences which distinguish them from ungrazed populations. These differences frequently are interpreted as an adaptive response that reduces grazing damage; however, there are few experimental tests of this hypothesis. This paper describes a field experiment designed to determine whether morphological variation among genotypes of the grass Bouteloua gracilis is related to variation in their responses to grazing. Eleven genotypes differing in morphological and reproductive characters were transplanted into a shortgrass steppe community near Fort Collins, Colorado. Replicates of each genotype were subjected to clipping treatments intended to realistically simulate three grazing intensities. After two growing seasons, different genotypes still maintained significant differences in a wide range of morphological and demographic characters. However, there were few significant effects of grazing treatment, and no significant genotype x treatment interactions. These results suggest that for B. gracilis clipped in simulation of natural grazing, defoliation has few short-term effects on fitness components, and intrapopulation morphological variation has few consequences for defoliation resistance.

Original languageEnglish (US)
Pages (from-to)66-74
Number of pages9
Issue number1
StatePublished - Apr 2000


  • Bouteloua gracilis
  • Grazing
  • Morphology
  • Resistance
  • Shortgrass steppe
  • Tolerance

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics


Dive into the research topics of 'Effects of simulated grazing on different genotypes of Bouteloua gracilis: How important is morphology?'. Together they form a unique fingerprint.

Cite this