Abstract

Joshua Christie, Carl Brusse, Pierrick Bourrat, Peter Takacs, and Paul Griffiths argue that selected-effects (SE) functions generally fail to causally explain traits because they omit some explanatorily essential information. Heterogeneous environments, bet-hedging strategies, and frequency-dependence all produce selection dynamics that are explanatorily important but that are left out when we focus exclusively on the conditions under which a given trait was adaptive. Thus, they argue, the SE theory gives inadequate explanations since it only picks out a limited set of explanatorily relevant factors. Some other authors in this volume have responded by trying to clarify the explanatory goals of SE functions in order to show that their omission of these phenomena is unproblematic. I take a different approach, arguing that in some important cases—including, perhaps, the case of signalling—environmental heterogeneity and coevolution can be explanatorily relevant because they are some of the functional effects of traits. I agree with the authors that these dynamics are important for explaining adaptations; however, I suggest that they need not be left out by SE explanations, because they can be among the effects for which traits are selected. Niche construction theory offers a useful framework for understanding these dynamics in this way.