Data: Strengths and Limitations
We have compiled and analyzed a large quantitative food-web. First, while the bulk of previous studies use food-webs with a number of species ranging from 25 to 94 (only one food web has as much as 181 species), our food web has 249 species. Second, in the previously published foodwebs the level of aggregation is really high (nodes of the web correspond to trophic species, not taxonomic species). In contrast, the bulk of species in our food web correspond to taxonomic species. Third, almost all previously studied food-webs are qualitative, while we present quantitative information. However, our data have still weaknesses which need to be acknowledged to put our conclusions in perspective. There are two potential limitations: the variability in diet and biomass estimates and the unequal level of resolution.