The variability of orchid population size
نویسندگان
چکیده
منابع مشابه
Relationships between population size and pollen fates in a moth-pollinated orchid.
Management of small plant populations requires an understanding of their reproductive ecology, particularly in terms of sensitivity to Allee effects. To address this issue, we explored how components of pollen transfer and pollination success of individual plants varied among 36 populations of the self-compatible moth-pollinated orchid Satyrium longicauda in South Africa. Mean fruit set, seed p...
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The sizes in a population of genetically identical Escherichia coli cells is known to vary, independent of growth stage. Multiple genes and proteins involved in cell division and DNA segregation are involved in regulating cell size. At the same time, physical factors such as temperature, growth rate and population size also appear to affect cell sizes. How these physical factors interact with t...
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Objective(s) The objective of this study was to document and explain bilateral differences in the Q angle. Materials and Methods Two hundred limbs of healthy adult Indian volunteers were studied. The Q angle was measured using a goniometric method with the subjects supine, quadriceps relaxed and lower limbs in neutral rotation. The relative lateral placement of the tibial tuberosity with res...
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Effective population size ( Ne ) influences the degree to which random genetic drift changes allele frequencies, increases inbreeding, and decreases genetic diversity, and thus is a parameter of direct relevance to the conservation of rare species. Few empirical data are available, however, concerning the effects of clonal structure on Ne in plant species reproducing both sexually and asexually...
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1. How population sizes vary with time is an important ecological question with both practical and theoretical implications. Because population size variability corresponds to the operation of density-dependent mechanisms and the presence of stable states, numerous researchers have attempted to conduct broad taxonomic comparisons of population size variability. 2. Most comparisons of population...
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ژورنال
عنوان ژورنال: Botanical Journal of the Linnean Society
سال: 1998
ISSN: 0024-4074
DOI: 10.1111/j.1095-8339.1998.tb02516.x