Over at Your Wildlife, Rob Dunn speculates:
How many ants are there in New York? The math is simple enough. We know from work that Britne Hackett and Benoit Guenard began (and Amy Savage is following up upon) that in a sample of one square meter of leaf litter there are about fifty ants, a village. Slightly more in the parks, slightly fewer in more stressed environments such as medians. But fifty is a good round starting place.
Now, how much green space is there in the city? We found one set of land use tables in which “open space” is a measure of part of the green space in the city; it does not include small patches of green such as medians or privately owned abandoned lots, but it is a starting point. If we multiply the number of ants in a square meter by the number of square meters in each borough and then double our estimate (to very conservatively account for the ants under ground at any moment) we get the following…
At a glance, those numbers don’t look great for people. But do they mean anything?
Functionally, would biomass be a more relevant comparison than body count? And, in light of the many simplifying assumptions underlying Rob’s calculation, might other methods be more accurate?