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Aim
The spatial pattern of tropical fire‐induced tree mortality is partly determined by climate, but feedbacks of tree cover on fire are also important. We re‐examine some recent observations proposed as evidence for very strong tree‐cover feedbacks on fire, sufficient to allow savanna and forest to be alternative stable states over large areas of the tropics. Two pieces of previously reported observational...
Aim
Some regions donate more invaders from particular taxonomic and functional groups than they receive. We demonstrate a particularly striking donor–recipient asymmetry in invasion ecology in grasses. Specifically, we explore whether low numbers of invasive grasses in South Africa can be explained by sampling biases, introduction dynamics, species traits or invasibility of ecosystems.
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