Continental-scale patterns of canopy tree composition and function across Amazonia

Article Abstract:

The seven forest inventory data collected form nine countries with territory in the Amazon Basin and trait and inventory data collected elsewhere, are used to show two dominant gradients in tree composition and function across the Amazon, one paralleling a major gradient in soil fertility and the other paralleling a gradient in dry season length. The data set also show that the dominance of Fabaceae in the Guiana shield is not necessarily the result of root adaptations to poor soils.

United States, Cash grains, not elsewhere classified, Dry Pea and Bean Farming, Pulses, Environmental aspects, Legumes, Mimosaceae, Beans, Amazon River, Tropical plants

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Sterilization and canopy modification of a swollen thorn acacia tree by a plant-ant

Article Abstract:

Host parasitism in an east African plant-ant is described. It prunes and sterilizes its host-tree canopies, to minimize contact with competing ants in neighbouring trees. It is proposed that the high density of ant-trees and low diversity of tree species in the savanna environments, have selected for parasitic pruning of host trees by the competing subordinate ants.

Physiological aspects, Parasitism, Acacia, Acacia (Plant), Parasitic ants

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Evidence against turbulent and canopy-like magnetic fields in the solar chromosphere

Article Abstract:

Solar research suggests that ground-level atomic polarization occurs when the electric ground-state magnetic sublevels of the sodium atom do not match. A proposed polarization mechanism is used to describe the process of polarization and depolarization. It is suggested that depolarization is not found in the solar chromosphere.

Solar activity, Solar chromosphere, Chromosphere

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