PERCENTAGE biomass in NO WAY reflects “the richness of the mammal kingdom”. It is a synthetic metric that scientists can futz around with enough to produce some shocking metric and get funding/press.
ABSOLUTE “biomass” is meaningful, simply because mammals have relatively tight weight ranges and you can estimate the individual counts from the biomass- but let’s be real: it is most likely that they start with estimates of number of individuals and multiply that by the average weight to get biomass. So- ditch the biomass and show absolute numbers of individuals over time. That is meaningful.
ABSOLUTE “biomass” is meaningful, simply because mammals have relatively tight weight ranges and you can estimate the individual counts from the biomass- but let’s be real: it is most likely that they start with estimates of number of individuals and multiply that by the average weight to get biomass. So- ditch the biomass and show absolute numbers of individuals over time. That is meaningful.