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Keyword: competition

Explaining growth of individual trees: Light interception and efficiency of light use by Eucalyptus at four sites in Brazil

Publications Posted on: March 25, 2010
The growth of wood in trees and forests depends on the acquisition of resources (light, water, and nutrients), the efficiency of using resources for photosynthesis, and subsequent partitioning to woody tissues. Patterns of efficiency over time for individual trees, or between trees at one time, result from changes in rates photosynthesis and shifts in the relative partitioning to wood.

The use of landscape fabric and supplemental irrigation to enhance survival and growth of woody perennials planted on reclaimed surface mine lands

Publications Posted on: December 02, 2009
A study was initiated to determine the effectiveness of landscape fabric and supplemental irrigation in survival and growth of woody perennials planted on reclaimed surface coal mine lands. The study compared growth and survival of nursery grown potted aspen and serviceberry planted with or without landscape fabric, and with or without biweekly supplemental irrigation.

Novel weapons and invasion: Biogeographic differences in the competitive effects of Centaurea maculosa and its root exudate (±)-catechin

Publications Posted on: November 12, 2009
Recent studies suggest that the invasive success of Centaurea maculosa

Competition and predation as mechanisms for displacement of greenback cutthroat trout by brook trout

Publications Posted on: December 17, 2008
Cutthroat trout Oncorhynchus clarkii frequently are displaced by nonnative brook trout Salvelinus fontinalis, but the ecological mechanisms of displacement are not understood. Competition for food and predation between greenback cutthroat trout O. c. stomias and brook trout were investigated in montane streams of Colorado.

Modeling effects of overstory density and competing vegetation on tree height growth

Publications Posted on: August 20, 2008
We developed and evaluated an individual-tree height growth model for Douglas-fir [Pseudotsuga menziesii (Mirbel) Franco] in the Inland Northwest United States. The model predicts growth for all tree sizes continuously, rather than requiring a transition between independent models for juvenile and mature growth phases. The model predicts the effects of overstory and understory vegetative competition on height growth.

Abies concolor growth responses to vegetation changes following shrub removal, northern Sierra Nevada, California

Publications Posted on: November 30, 2007
Conifer productivity in western North America is often severely inhibited by competing vegetation. Abies concolor [Gord. and Glendl.] Lindl. (white fir) is an important species over much of this area, yet little information is available on response of A. concolor to vegetation management treatments. We revisited two sites in the northern Sierra Nevada to assess the responses of naturally regenerated A.

Red-tailed hawk dietary overlap with northern goshawks on the Kaibab Plateau, AZ

Publications Posted on: January 22, 2007
We determined food habits of Red-tailed Hawks (Buteo jamaicensis) for comparison with published information for Northern Goshawks (Accipiter gentilis) to evaluate potential competition on the Kaibab Plateau, Arizona.

Sexual differentiation in the distribution potential of northern jaguars (Panthera onca)

Publications Posted on: June 08, 2006
We estimated the potential geographic distribution of jaguars in the southwestern United States and northwestern Mexico by modeling the jaguar ecological niche from occurrence records. We modeled separately the distributions of males and females, assuming records of females probably represented established home ranges while male records likely included dispersal movements. The predicted distribution for males was larger than that for females.