Additive genetic variation of secondary and primary metabolites in mountain birch

Article Abstract:

The mountain birch populations suffer from regular autumnal moth defoliations that affect tree survival and growth where it is found that birch individuals show clear differences in their leaf chemistry and it may be relevant to herbivore performance. The amino acids had less genetic variation than phenolic compounds and the high genetic variation of the phenolic compounds indicate that the mountain birch is able to evolve its phenol based resistance.

Insect-plant relationships, Plant metabolites, Genetic variation

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A short-lived herbivore on a long-lived host: Tree resistance to herbivory depends on leaf age

Article Abstract:

A test on the hypothesis of the adaptation of the short-lived insect herbivores is conducted with the measurement of leaf consumption by, and growth of, half-sibs of the geometrid moth 'Epirrita autumnata' on individual birch trees, during three instars. Results indicate that developmental variance in the leaf quality of individual trees might reduce the likelihood of E. autumnata genotypes adapting to the defenses of their host trees.

Moths, Adaptation (Biology), Evolutionary adaptation, Ecological research

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Nature of size-number trade-off: Test of the terminal-stream-limitation model for seed production of Cardiocrium cordatum

Article Abstract:

The prediction of the terminal-stream-limitation model using Cardiocrium cordatum is tested. It forecasts that the total offspring mass increases with offspring number, whereas it decreases with offspring size, because the loss of resources via maintenance respiration decreases with offspring number but increases with offspring size.

Nursery and Floriculture Production, Seeds, AGRICULTURAL PRODUCTION--CROPS, Environmental aspects, Phanerogams, Seed plants

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