Dynamics of Weed Populations
Weeds have ecological attributes that confer the ability to interfere with human activities. Roger Cousens and Martin Mortimer place weed management within an ecological context, with the focus on the manipulation of population size. They consider the dynamics of abundance and spatial distribution at both geographic and local scales, and consider the basic processes of dispersal, reproduction and mortality together with the factors that influence them. The authors show how management modifies patterns of behavior that are intrinsic to populations, and note the evolution and management of resistance to herbicides. This book provides weed science with the conceptual basis that has previously been lacking. It also gives ecologists and botanists access to the extensive database on the population ecology of weeds.
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Weed population dynamicsthe framework
The impact of weeds
The development of a weed flora
The concept of a habitat
Studying weed populations
Lifecycles and life histories
The dynamics of geographic range expansion
Extrinsic factors affecting population density
The effects of agricultural management factors
The effects of weather
Interactions with other organisms
Using models to explore weed control options
The spatial dynamics of weed populations
Are there recognisable phases in the invasion process?
How can we measure rate of spread from available data?
What governs rate of spread during an invasion?
What makes range expansion cease?
have species of weeds spread in some directions more than in others?
Have particular modes of dispersal dominated spread between continents?
implications for the management of invasions
Dispersal within and between populations
Patterns of dispersal
Dispersal by different agencies
How important are the various vectors of dispersal?
Processes involved in the regulation of population density
The seed phase
The seed phase
The plant phase
Vegetative reproductive phase
The intrinsic dynamics of population density
What types of trajectory are likely?
how do we go about mathematical modelling?
Mathematical models of population density
What types of trajectory occur in practice?
The implications of habitat mosaics within fields
Field observations of the spread of weed populations
Models of patch expansion
Implications for patch formation
Field observations of the dynamics of weed patches
a conceptual view
Suggestions from simulation models
The evolution of herbicide resistance
single and multigene systems
The dynamics of selection
The management of herbicide resistance
Weed population dynamics synthesis and prognosis
Is the data base extensive enough?
Can changes in weed populations be predicted?
Are the right questions being answered?
Can studies of weed biology drive changes in farm or land management?
Other editions - View all
abundance achenes allele Alopecurus myosuroides annual arvensis Australia Avena Avenafatua behaviour biotype Bromus sterilis cereal changes Chapter chemical Chenopodium album chlorotoluron combine harvester Cousens crop cultivation curve decline density-dependent direct drilling dispersal distance distribution dormancy dynamics of weed ecology effects Elymus repens emergence equation equilibrium example exponential factors farm fatua field frequency gene genotypes germination habitat harvesting herbicide resistance individuals invasion life-cycle Lolium rigidum long term loss mortality Mortimer number of seeds occur parameters pasture patch plant population plots ploughing population density population dynamics predation predictions propagules proportion range rate of increase rate of spread recorded reduced relative result rhizomes seed bank seed production seedlings selection simulation single soil surface sowing sown spatial studies survival susceptible temperature tillage tion trajectory triazine tubers types values vary vegetation weed control weed density weed flora weed management weed population dynamics weed seeds weed species winter wheat