Herbivory modifies the genetic structure of birch populations

Article Abstract:

The effects of selective herbivory on genetic diversity in seedling populations of silver birch, a light-demanding pioneer species were experimentally studied. Comparison of the observed mortality to a simulated control representing random mortality during thinning phase, revealed that mortality resulted in decreased diversity compared to the simulated control, thus demonstrating the importance of herbivores in shaping the genetic structure of plant populations during thinning phase.

Finland, Biological diversity, Biodiversity, Competitive displacement

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On ecological fitting, plant-insect associations, herbivore host shifts, and host plant selection

Article Abstract:

The role of ecological fitting as an important process in structuring plant-insect associations and its implications for host plant selection by herbivores is discussed. It is learnt that when a species expands its range into new environments, it brings with it a historical legacy of traits that evolved elsewhere, and interacts immediately with many other species with similarly varied histories.

Pennsylvania, Adaptation (Physiology), Physiological adaptation, Phylogeny (Botany), Plant phylogeny, Plant selection

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Variation in birch bark secondary chemistry between and within clones: implications for herbivory by hares

Article Abstract:

The variations seen in bark chemistry between and within 19 European white birch clones and its implications to resistance to the mountain hare are discussed. The high variation in secondary chemistry indicates that the European white birch populations have a good resistance towards variable environmental conditions and varying pressures from herbivory.

Europe, Biological Product (except Diagnostic) Manufacturing, Drugs, DNA Clones, Chemical properties

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