Nearly 6,000 monitored vertebrate species across more than 35,000 populations declined by an average of 73% from 1970 to 2022, the World Wide Fund for Nature said in its latest Living Planet Report published on Thursday.
Nearly 6,000 monitored vertebrate species across more than 35,000 populations declined by an average of 73% from 1970 to 2022, the World Wide Fund for Nature said in its latest Living Planet Report published on Thursday.
Ok; I’ve thought through several examples. The geometric mean is heavily biased to show a decrease IMO. A species could have it’s total population grow substantially, but if most of that growth is to already large/successful subsets, then it’ll almost certainly show as a negative (geometric) average change, even with ~noise on the other populations. I think you should only see a positive metric here if most species measured are invasive; growing extremely fast in places not prepared for them. (and being careful not to measure the things getting killed by the new invaders)