Category Archives: Ecologies

3.04 Trillion Trees Are Not Enough

[Crowther et al 2015] Anstract: The global extent and distribution of forest trees is central to our understanding of the terrestrial biosphere. We provide the first spatially continuous map of forest tree density at a global scale. This map reveals that the global number of trees is approximately 3.04 trillion, an order of magnitude higher than the previous estimate. Of these trees, approximately 1.39 trillion exist in tropical and subtropical forests, with 0.74 trillion in boreal regions and 0.61 trillion in temperate regions. Biome-level trends in tree density demonstrate the importance of climate and topography in controlling local tree densities at finer scales, as well as the overwhelming effect of humans across most of the world. Based on our projected tree densities, we estimate that over 15 billion trees are cut down each year, and the global number of trees has fallen by approximately 46% since the start of human civilization. [Nature (2015) doi:10.1038/nature14967] Continue reading

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Naturalist-Writers: Stephen Moss on the Great Skua

Stephen Moss is a naturalist, writer and broadcaster, based at the BBC Natural History Unit. He writes the monthly Birdwatch column for The Guardian. His July 19 column whets my imagination for seabirds and islands in the northern-most reaches of the British Isles. Continue reading

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Hell-bent on Hellbender DNA

Conservation scientist Stephen Spear, for example, has been sampling water to study one of the oddest creatures in American streams: the hellbender salamander. Continue reading

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