Effects of local density on insect visitation and fertilization success in the narrow-endemic Centaurea corymbosa (Asteraceae)

Article Abstract:

The effects of local conspecific density on insect visitation and fertilization success in the rare, cliff-dwelling, self-incompatiable Centaurea corymbosa, in which fecundity plays a key role in variation in population growth rate among years and among extant populations are investigated. The results suggest that pollen limitation affects fertilization rate in Centaurea corymbosa due to limited compatible mate availability rather than pollinator limitation.

Pesticide and Other Agricultural Chemical Manufacturing, Agricultural chemicals, not elsewhere classified, Insect Attractants

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Phenotypic plasticity for dispersal ability in the seed heteromorphic Crepis sancta (Asteraceae)

Article Abstract:

The heteromorphic plant Crepis sancta, of the Compositae family, was subjected to different environmental stresses to determine their effects on seed fecundity and dispersal. These stresses included nutrient depletion, simulated herbivory, and nutrient depletion plus simulated herbivory; herbivory produced seed heads that were more fecund, while all stresses produced a greater proportion of seeds with dispersal structures.

France, Statistical Data Included, Environmental aspects, Seeds, Seed dispersal, Compositae, Asteraceae, Plants, Effect of stress on

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Functional stability of microbial communities in contaminated soils

Article Abstract:

The functional stability of soil microbial communities that are exposed to different levels of copper and pH for more than 20 years is investigated. The results confirm the notion that environmental stress alters ecosystems such that supplementary stress will have stronger impacts than in an unstressed system.

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