Eugene Schupp
Utah State University, Wildland Resources, Faculty Member
Research Interests: Soil, Seed Dispersal, Ecology, Rodentia, Spain, and 9 moreAnimals, Quercus, Feeding Behavior, Oak, Oecologia, Germination, Quercus ilex, Ecosystem, and Seeds
In this paper we analyze the seed dispersal stage of the Prunus mahaleb-frugivorous bird inter- action from fruit removal through seed delivery within the context of disperser effectiveness. The effectiveness of a frugivorous species as a... more
In this paper we analyze the seed dispersal stage of the Prunus mahaleb-frugivorous bird inter- action from fruit removal through seed delivery within the context of disperser effectiveness. The effectiveness of a frugivorous species as a seed disperser is the contribution it makes to plant fitness. Effectiveness depends on the quantity of seed dispersed (''quantity component'') and the quality of
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A plausible explanation for how rapid migrations were achieved can guide forecasts for tree populations in the twenty-first century
Page 1. THE BOTANICAL REVIEW VOL. 65 JANUARY-MARCH 1999 NO. 1 Seed and Seedling Ecology of Pifion and Juniper Species in the Pygmy Woodlands of Western North America JEANNE C. CHAMBERS USDAForestService ...
Research Interests: Plant Biology, Life history, Seed Dispersal, Native American, Seed germination, and 13 moreWestern North America, Seed Development, Population Growth, Seed Coat, Plant population ecology, Long Distance Dispersal, Botanical, Seedling Establishment, Southwestern United States, Livestock Grazing, Embryos, The Botanical, and Nurse plant
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We evaluated the balance between positive and negative effects of environmental conditions on first-year seedling survival of the tree Cercocarpus ledifolius during two summers, 1996 and 1997. The experimental design was fully crossed... more
We evaluated the balance between positive and negative effects of environmental conditions on first-year seedling survival of the tree Cercocarpus ledifolius during two summers, 1996 and 1997. The experimental design was fully crossed with two levels of water, with and without supplementation, two levels of herbivory, with and without protection, and three major microhabitats, open interspaces, under the canopy of Artemisia tridentata shrubs, and under the canopy of mature C. ledifolius trees. Effects of drought and herbivory on seedling survival depended on the year. Water supplementation and herbivory protection during the dry summer of 1996 (27.7 mm) generally increased seedling survival. Additionally, survival tended to be greatest beneath C. ledifolius canopies. More important ecologically were the significant interactions. In 1996, water supplementation increased survival more with than without herbivory protection. The three-way interaction, treatment-microhabitat combination, was most important; by far the greatest survival was in the water supplementation and herbivory protection in the tree microhabitat. During the wet summer of 1997 (158.5 mm), neither water supplementation, herbivory protection, nor microhabitat were significant as main effects. The water-supplemented and herbivory-protected treatment again combined to yield highest survival, but this time in open interspaces rather than beneath trees. Our study shows how the importance of individual limiting factors and the relative favorableness of particular microhabitats appear to change across years depending on environmental conditions.
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Research Interests: Soil, Seed Dispersal, Ecology, Rodentia, Spain, and 9 moreAnimals, Quercus, Feeding Behavior, Oak, Oecologia, Germination, Quercus ilex, Ecosystem, and Seeds
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Page 1. ORIGINAL PAPER Effects of resource availability and propagule supply on native species recruitment in sagebrush ecosystems invaded by Bromus tectorum Mónica B. Mazzola Jeanne C. Chambers Robert R. Blank ...