Would you search for changes at the global scale, or at continental, regional or local scales? More importantly, would you expect to see the same trend or different trends if you examined changes at many scales?
At the global scale, biological diversity on Planet Earth is on the skids. Thousands of species face extinction and over a thousand hectares of forest are cleared every hour. Species diversity is falling because species are going extinct faster than new species can evolve. And we’re causing it.
At the continental scale, we see the opposite pattern. Continue reading
What kind of data would you wish you had from 2013?
Let’s brain-storm a few ideas. I’m sure it’d be helpful if, back in 2013, people had recorded the distribution of plants along transects that criss-crossed the countryside, crossing the wet-to-dry climate gradient. This information would allow you to see which species expanded, contracted or migrated during the period, and how these changes related to changes in rainfall. Continue reading
Stock grazing has reduced the conservation value of many native grasslands and woodlands in southern Australia. Not surprisingly, we often remove stock to help restore degraded areas. But how well does this work? Can damage caused by past grazing be reversed, or will the removal of stock create new, unexpected communities? Continue reading
Grazing by livestock (mainly sheep and cattle) has irreversibly degraded many natural ecosystems in Australia. Consequently, stock are usually removed from public land when new conservation reserves are declared. The damaging effects of livestock on ecosystems such as rivers, wetlands and the alps are well known.
On the other hand, ecologists have recommended that stock continue to graze in certain types of reserves. Continue reading