Population Biology of Plants
This book, written in 1977, brought together for the first time, the current knowledge of plants that might be relevant to understanding their population biology. ¿This monumental volume did more than summarize the state of plant biology; ¿it linked the conceptual and theoretical developments in population ecology, mostly derived from the study of animals, with field observations and experimental evidence of population regulation and life history evolution in plants. ¿ ¿The field of population biology was already well established in the 1960s although with a clear zoocentric emphasis, however, it is because of Harper¿s work that the field experienced a veritable explosion, reached maturity and became a mainstream scientific endeavour worldwide. This field is so vast now that it would be pointless, if not impossible, for someone to summarise it. It is precisely because of this that PBP is as relevant now as it was in 1977. John Harper¿s style of highlighting unanswered questions and the limitations of both theory and empirical evidence served and still serves as foundation for research agendas worldwide. Much remains to be done in this field and this alone makes PBP an essential element in the library of every student/researcher of population biology, whether interested in plants or animals.¿ From the ¿Preface to the 2010 Printing¿ written by José Sarukhán, Rodolfo Dirzo and Miguel Franco.
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Experiments Analogies and Models
The Influence of Density on Yield and Mortality
The Influence of Density on Form and Reproduction
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achenes age structure animals annual annual plants assimilation rate barley behaviour canopy changes Chapter clonal clover colonization competition crop curves cycle death defoliation density stress determined dispersal distribution diversity dormancy dry weight ecological effects environment establishment experiment experimental favoured flowering forest fronds genetic genotypes germination grass grassland grazing growing growth rate habitats Harper harvest increase individuals interaction Leaf Area Index leaves light intensity Lolium perenne mixture monophagous mortality natural neighbours nitrogen number of seeds nutrients occur pasture pathogens perennial period phase Pinus plant population plots polymorphism population biology predators prey produced pure stands ramets Ranunculus recruitment relationship relative reproductive rhizome root system rosettes season seed bank seed production seedlings selection shoots shown in Fig soil surface sown species stage survivorship survivorship curves sward tillers tion trees Trifolium repens Trifolium subterraneum variation vegetation weed yield