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Like the settlers that fanned across the plains during westward expansion, pioneer riparian trees like cottonwoods and willows are particularly hardy and well suited to the unpredictable life of a changing river.

Due in part to their fast growth and large size, these pioneer tree species provide important structure and function, for example, in food web dynamics, nutrient cycling, erosion control, and as a habitat for fish (as trees and branches fall into the river) and wildlife.

It’s ironic – while the focus of so much environmental attention these days relates to how species and ecosystems are going to respond to all the changes we are throwing at them, certain species that thrive on change find themselves living in an artificially stabilized world, with equally problematic results.

Meta Amyllia

Due in part to their fast growth and large size, these pioneer tree species provide important structure and function, for example, in food web dynamics, nutrient cycling, erosion control, and as a habitat for fish (as trees and branches fall into the river) and wildlife

4 Comments

  1. In the case of a single rigid body, the center of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centroid.

    The center of mass may be located outside the physical body, as is sometimes the case for hollow or open-shaped objects, such as a horseshoe. In the case of a distribution of separate bodies, such as the planets of the Solar System, the center of mass may not correspond to the position of any individual member of the system.

    1. In the latter case, the center-of-gravity will always be located somewhat closer to the main attractive body as compared to the mass-center, and thus will change its position in the body of interest as its orientation is changed.

  2. All forces are equal and opposite. Calculations in mechanics are often simplified when formulated with respect to the center of mass.

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