 Another component of biodiversity according to Maclaurin and Sterelny concerns the ecological interactions between species (Morin 2011). This additional structure is given by interspecific competition, predator-prey relations, and mutualism along with possible higher-order ones like trophic cascades. In the absence of such interactions, a group of species is nothing more than the “sum of the parts” (Clements 1916; Eliot 2011; Gleason 1926; Odenbaugh 2007; R.H. Whittaker 1967). In the presence of such interactions, they hypothesize the existence of emergent properties that are not a “simple reflection” of the species themselves (Maclaurin &amp; Sterelny 2008: 120). Additionally, even if there were no such emergent properties, we would like to know what their causal contribution is: how to do they drive community patterns? Infamously, some ecologists have hypothesized that as the diversity of a community increases, so does the stability of the community (Egerton 1973; Elton 2000; MacArthur 1955; May 1973/2001; Tilman, Wedin, &amp; Knops 1996). ‘Diversity’ can be understood as the number of species present, the number of interactions, or intensity of those interactions. ‘Stability’ can be understood in a variety of ways from notions of Lyapunov stability, return time after a perturbation, biomass stability, etc. (Justus 2008; Pimm 1984). Ecologists have theorized, experimented, and collected a great deal of data regarding this hypothesis, but its truth remains elusive. Maclaurin and Sterelny suggest we can articulate an ecospace including at least the boundedness, degree of emergent properties, and internal regulation as variables to describe ecological communities (Maclaurin &amp; Sterelny 2008: Ch. 6). One serious worry is whether any of these features can be measured in an informative way. But, insofar as there are no community boundaries, no emergent properties, and no internal regulation, there are no communities. The robustness of communities would require each of these take non-zero values. Additionally, these variables are not independent and hence the ecospace would have to take account of the interactions between each variable. For example, internal regulation might be a function of the emergent properties possessed by the community, and the boundaries of a given community determined by those very properties (Sterelny 2006).