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Demography and population ecology




Long-term study of  the grass Bouteloua rigidiseta

Since 1983 an annual census has been made of a set of permanent plots located in open grassy patches in a live oak/Ashe juniper savanna in central Texas.  Data from these plots have provided the basis for on ongoing study of plant population dynamics and regulation, especially of the native perennial grass Bouteloua rigidiseta (Texas grama grass). 

Fowler, N. L., R. D. Overath, and C. M. Pease. 2006. Detection of density dependence requires density manipulations and calculation of λ. Ecology 87:655-664. Abstract  

Fowler, N. L. 1995. Density-dependent demography in two grasses: a five-year study. Ecology 76:2145-2164. Abstract

Fowler, N. L. 1986.  Density-dependent population regulation in a Texas grassland.  Ecology 67:545-554. Abstract

 




Modeling demographic heterogeneity

demographic heterogeneity poster (Batchelor and Fowler 2003)

   



Effects of simulated grazing on Bothriochloa ischaemum population dynamics

Bethany Gabbard compared clipped and unclipped plots in a field population of this invasive grass to quantify the effects of defoliation on life history components, population structure, and λ.

Bothriochloa population dynamics poster (Gabbard & Fowler 2004)




Other effects of herbivores on plant populations

deer/oaks, deer/Streptanthus 

cattle/grasses

 

 

   



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