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Preface | |
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Weed population dynamics--the framework | |
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The impact of weeds | |
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The development of a weed flora | |
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The concept of a habitat | |
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Studying weed populations | |
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Life-cycles and life histories | |
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Overview | |
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The dynamics of geographic range expansion | |
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Are there recognisable phases in the invasion process? | |
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How can we measure rate of spread from available data? | |
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What governs rate of spread during an invasion? | |
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What makes range expansion cease? | |
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Invasion direction: have species of weeds spread in some directions more than in others? | |
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Have particular modes of dispersal dominated spread between continents? | |
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Models of range expansion: implications for the management of invasions | |
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Conclusions | |
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Dispersal within and between populations | |
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Patterns of dispersal | |
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Dispersal by different agencies | |
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How important are the various vectors of dispersal? | |
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Conclusions | |
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Processes involved in the regulation of population density | |
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The seed phase | |
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The plant phase | |
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Vegetative reproductive phase | |
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Conclusions | |
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The intrinsic dynamics of population density | |
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What types of trajectory are likely? | |
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A short digression: how do we go about mathematical modelling? | |
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Mathematical models of population density | |
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What types of trajectory occur in practice? | |
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Conclusions | |
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Extrinsic factors affecting population density | |
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The effects of agricultural management factors | |
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The effects of weather | |
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Interactions with other organisms | |
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Using models to explore weed control options | |
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Conclusions | |
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The spatial dynamics of weed populations | |
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The implications of habitat mosaics within fields | |
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Field observations of the spread of weed populations | |
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Models of patch expansion | |
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Implications for patch formation | |
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Field observations of the dynamics of weed patches | |
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Meta-population dynamics and weed populations: a conceptual view | |
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Suggestions from simulation models | |
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Conclusions | |
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The evolution of herbicide resistance | |
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Theoretical background | |
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The genetic basis of herbicide resistance: single and multigene systems | |
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The dynamics of selection | |
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The management of herbicide resistance | |
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Conclusions | |
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Weed population dynamics: synthesis and prognosis | |
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Is the data base extensive enough? | |
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Can changes in weed populations be predicted? | |
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Are the right questions being answered? | |
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Can studies of weed biology drive changes in farm or land management? | |
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Conclusions | |
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References | |
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Organism index | |
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Subject index | |