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Ecological Section

Thomas, Shyam [1], Thompson, Steven [2], Palmer, Michael W. [1].

The effect of mowing on species richness, turnover and speciescomposition of an Oklahoma grassland.

We examine the effect of mowing on the species richness, turnover (immigration and extinction rates) and composition of a grassland community. The mowing regime varied in frequency (0, 1, 2 or 3 mowings per year) and season of mowing (March, June, September). Richness peaked at the triple mowing frequency and September season of mowing. Species richness is negatively but weakly correlated with litter cover. Local immigration and extinction rates appear to stabilize through time, with a higher initial immigration rates across all treatments recorded in the first years sampling, while the following year recorded the highest rates of extinction for all treatments. Species composition of the control treatment tend is much unlike the mown treatments, with tall forbs more frequent in the control. Among the mowing treatments, there was a discernible but subtle effect of early season and late season mowing on species composition.


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1 - Oklahoma State University, Department of Botany, College of Arts and Sciences, 104 Life Sciences East, Stillwater, Oklahoma, 74078, USA
2 - North Western Oklahoma State University, Department of Natural Science, 709, Oklahoma Boulevard, Alva,, Oklahoma, 73717, USA

Keywords:
extinction rates
grassland
immigration rates
litter
mowing frequency
mowing season
species composition
species richness.

Presentation Type: Oral Paper
Session: 47-5
Location: Salon F - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 11:15 AM
Abstract ID:205


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