منابع مشابه
Life-history evolution in range-shifting populations.
Most evolutionary theory does not deal with populations expanding or contracting in space. Invasive species, climate change, epidemics, and the breakdown of dispersal barriers, however, all create populations in this kind of spatial disequilibrium. Importantly, spatial disequilibrium can have important ecological and evolutionary outcomes. During continuous range expansion, for example, populat...
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Should parasites stabilize or destabilize consumer-resource dynamics? Recent theory suggests that parasite-enhanced mortality may confer underappreciated stability to their hosts. We tested this hypothesis using disease in zooplankton. Across both natural and experimental epidemics, bigger epidemics correlated with larger--not smaller--host fluctuations. Thus, we tested two mechanistic hypothes...
متن کاملSelection Pressure, Shifting Populations, and Herbicide Resistance and Tolerance
BRAD HANSON, UC Cooperative Extension Weed Specialist, Department of Plant Sciences, University of California, Davis; ALBERT FISCHER, Professor, Department of Plant Sciences, University of California, Davis; ANIL SHRESTHA, Associate Professor, Department of Plant Sciences, California State University, Fresno; MARIE JASIENIUK, Associate Professor, Department of Plant Sciences, University of Cali...
متن کاملRunning Head: Parasites Destabilize Host Populations 1 2 Parasites Destabilize Host Populations by Shifting Stage-structured Interactions 3 4
25 Should parasites stabilize or destabilize consumer-resource dynamics? Recent theory 26 suggests that parasite-enhanced mortality may confer underappreciated stability to their hosts. 27 We tested this hypothesis using disease in zooplankton. Across both natural and experimental 28 epidemics, bigger epidemics correlated with larger — not smaller — host fluctuations. Thus, we 29 tested two mec...
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No organism lives in a constant environment. Based on classical studies in molecular biology, many have viewed microbes as following strict rules for shifting their metabolic activities when prevailing conditions change. For example, students learn that the bacterium Escherichia coli makes proteins for digesting lactose only when lactose is available and glucose, a better sugar, is not. However...
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ژورنال
عنوان ژورنال: Nature
سال: 1992
ISSN: 0028-0836,1476-4687
DOI: 10.1038/355688b0