Getting the measure of tree invasions

“If you can't measure it, you can't manage it” is, as with all such well-worn phrases, only partly true. But to adapt another such maxim, while we might be able to make progress without measurement, we do need proof to satisfy everyone else.

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Read more about the article Unlocking the bottleneck
The invasive starling, Sturnus vulgaris. Photo credit: Pierre Selim.

Unlocking the bottleneck

Geographic range expansions by plants and animals have presented a number of puzzles to scientists. The first of these is known as Reid’s paradox: species ranges often expand much faster than expected from normally observed dispersal rates.

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