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Plant and bird diversity in the Indonesian jungle rubber agroforestry system was compared to that in primary forest and rubber plantations by integrating new and existing data from a lowland rain forest area in Sumatra. Jungle rubber gardens are low-input rubber (Hevea brasiliensis) agroforests that structurally resemble secondary forest and in which wild(More)
Characteristic species of sedge-moss fen communities occur in constantly wet, nutrient-poor sites with a high penetration of light through the vegetation canopy. We studied the effects of water table depth and differences in light intensity on the performance of fen species. Three fen species (Carex curta, Viola palustris, Hydrocotyle vulgaris) and one(More)
From a study of differently aged populations of the perennial plant species Chamaenerion angustifolium a concept was deduced concerning the population dynamics of the species. The age structure was determined by counting the rings of periderm in the roots. After the establishment of seedlings vegetative propagation is the main factor in population(More)
In natural vegetation, individuals of different species are more often than not distributed contagiously and arranged as patches. In experimental studies on interference between plant species, this aspect has been neglected. In the experimental approach presented here the vegetation (seven plant species characteristic of woodland clearings) consists of a(More)
We studied fine-scale spatial plant distribution in relation to the spatial distribution of erodible soil particles, organic matter, nutrients and soil water on a sandy to sandy loam soil in the Sahel. We hypothesized that the distribution of annual plants would be highly spatially autocorrelated and that this would be positively linked with the spatial(More)
Mapping cryptic invaders and invasibility of tropical forest ecosystems: Chromolaena odorata in Nepal. Figure 2-2. The world distribution of Chromolaena odorata: area under infestation (Black) and native range (Grey). Map based on global invasive species database (ISSG 2004). Figure 2-4. Application of remote sensing in detecting individual invasive species(More)
The nutritional status of the soils of a series of coniferous woodland clearings in the Netherlands was found to be intermediate between that of the soil in a dune area with a climax population of Chamaenerion angustifolium and that of the edge (and undergrowth) of a Quercus robur stand. In the dune area the greater part of the NPK was present as an(More)
Seeds from two morphologically different groups in an Erophila verna dune population were used in a growth experiment to analyse and quantify flexibility and plasticity of growth and reproductive characteristics. A strong correlation between plant morphology and individual seed weight was shown in parents and progeny. Seeds of plants with narrow leaves were(More)
In Basommatophora medio-dorsal bodies (MDB) are closely attached to the cerebral ganglia, in which, just underneath the bodies, groups of Gomori-positive neurosecretory cells (MDC) occur. It has been suggested that the MDB-cerebral ganglion complex should be regarded as a neuro-endocrine association. In the present study the morphological relation between(More)
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