![]() However, the multifaceted role of plants makes the nature and strength of these effects difficult to predict. Alterations in these communities, such as those following plant invasion, may therefore affect consumers within impacted habitats. ![]() Plants play a major role in the construction and maintence of ecosystems, supporting green food webs through herbivory and brown food webs through detrital inputs, affecting abiotic habitat variables, and influencing energy flow through these systems by changing the structural context in which trophic transfers take place. However, alone this difference in their functional responses provides little information about the relative importance and impacts of the two species on the shared resource, or on the structure and Thus for any resource one could compare any randomly chosen pair of consumers with the result that one of them will always have the higher functional response. A conceptual challenge for the application of CFR is that even in relatively simple food webs most consumers share resources with multiple other consumers (Fig. and other CFR proponents need to address. In this response we provide details of three conceptual issues stemming from classical ecological theoretical frameworks and two practical problems that Dick et al. Further, they fail to provide a convincing argument why CFR is better than existing tools such as invasion history or impact indices, even when considering emerging or potential invaders. ![]() to exaggerate the generality of its utility, and about its ability to unify the field. However, we fear that the early successes of select examples of the comparative functional response (CFR) approach has led Dick et al. We agree that functional responses are an important and powerful quantitative description of consumer effects on resources, and co-opting classical ecological theory to better predict invasive species impacts is a laudable move for invasion biology. (Biol Invasions, 2017) propose that the comparative functional response framework provides a unifying approach for the study of invasive species.
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