Ecological communities are seldom, if ever, biological individuals. They lack causal boundaries as the populations that constitute communities are not congruent and rarely have persistent functional roles regulating the communities’ higher-level properties. Instead we should represent ecological communities indexically, by identifying ecological communities via the network of weak causal interactions between populations that unfurl from a starting set of populations. This precisification of ecological communities helps identify how community properties remain invariant, and why they have robust characteristics. This respects the (...) diversity and aggregational nature of these complex systems while still vindicating them as units worthy of investigation. (shrink)

In this essay I first provide an analysis of various community concepts. Second, I evaluate two of the most serious challenges to the existence of communities—gradient and paleoecological analysis respectively—arguing that, properly understood, neither threatens the existence of communities construed interactively. Finally, I apply the same interactive approach to ecosystem ecology, arguing that ecosystems may exist robustly as well. ‡I would like to thank to the participants at the Ecology and Environmental Ethics Conference at the University of Utah, the Philosophy (...) of Ecology Conference hosted by the University of Brisbane, and those participants in a session at the Philosophy of Science Association Meeting in Vancouver, British Columbia for helpful discussions of this essay. Specific thanks go to Mark Colyvan, Greg Cooper, Steve Downes, Chris Elliott, Marc Ereshefsky, Paul Griffiths, Jesse Hendrikse, Greg Mikkelson, Anya Plutynski, Kate Ritchie, Sahotra Sarkar, Kim Sterelny, and Rob Wilson. †To contact the author, please write to: Department of Philosophy, Lewis and Clark College, 0615 SW Palatine Hill Road, Portland, OR 97219; e-mail: [email protected]. (shrink)

This paper reinforces the current consensus against the applicability of the selected effect theory of function in ecology. It does so by presenting an argument which, in contrast with the usual argument invoked in support of this consensus, is not based on claims about whether ecosystems are customary units of natural selection. Instead, the argument developed here is based on observations about the use of the function concept in functional ecology, and more specifically, research into the relationship between biodiversity and (...) ecosystem functioning. It is argued that a selected effect account of ecological functions is made implausible by the fact that it would conflict with important aspects of the understanding of function and ecosystem functional organization which underpins functional ecology’s research program. Specifically, it would conflict with (1) Functional ecology’s adoption of a context-based understanding of function and its aim to study the functional equivalence between phylogenetically-divergent organisms; (2) Functional ecology’s attribution to ecosystems of a lower degree of part-whole integration than the one found in paradigm individual organisms; and (3) Functional ecology’s adoption of a physiological or metabolic perspective on ecosystems rather than an evolutionary one. (shrink)

This paper analyzes community ecologist Charles Elton’s ideas on animal communities, and situates them with respect to the classical opposition between organicist–holistic and individualistic–reductionist ecological views drawn by many historians of ecology. It is argued that Elton espoused a moderate ecological holism, which drew a middle way between the stricter ecological holism advocated by organicist ecologists and the merely aggregationist views advocated by some of their opponents. It is also argued that Elton’s moderate ecological holism resonated with his preference for (...) analogies between ecological communities and human societies over more common ones between communities and individual organisms. I discuss, on the one hand, how the functionalist-interactionist approach to community ecology introduced by Elton entailed a view of ecological communities as more or less self-maintaining functionally organized wholes, and how his ideas on this matter were incorporated into their views by organicist ecologists Frederic Clements, Victor Shelford, and Warder C. Allee et al. On the other hand, I identify some important divergences between Elton’s ecological ideas and those of organicist ecologists. Specifically, I show how Elton’s ideas on species distribution, animal migrations, and ecological succession entailed a view of animal communities as exhibiting a weaker degree of part-whole integration than that attributed to them by Clements and Shelford; and how Elton’s mixed stance on the balance of nature idea and his associated views on community stability attributed to communities a weaker form of self-regulation than that attributed to them by Allee et al. (shrink)

In early German ecology, the key concept used to refer to a synecological unit was Biozönose. Taken together with the concept of the Biotop, it was also understood as an integrated higher-order unit of life, sometimes called a “Holozön”. These units were often perceived as having properties similar to those of individual organisms, and they informed the mainstream of German ecology until at least the late 1960s. Here I ask how “organismic” these concepts really were and what conceptual problems they (...) entailed. To do so, I focus on some almost forgotten dissident positions, especially those of Friedrich Simon Bodenheimer and Fritz Peus, which I contrast with the mainstream German ecology of the time. In a radical paper published in 1954 that postulated the “dissolution of the concepts of biocoenosis and biotope”, Peus in particular elicited a forceful response from many prominent German ecologists. An analysis of the ensuing debate, including especially a colloquium held in 1959 that was partly inspired by Peus’ paper, is helpful for sifting the various arguments proffered with respect to a quasi-organismic perception of the biocoenosis in German speaking ecology. Although German mainstream ecologists rejected the notion of the biocoenosis as a superorganism, ontological holism was quite common among them. Additionally, the mainstream concept of the biocoenosis was plagued by several methodological problems and much conceptual confusion, to which the “dissidents” rightly pointed. Some of these problems are still pertinent today, e.g. in connection with more modern concepts such as “ecosystem”. (shrink)

In the theory and history of ecology, Frederic Clements’s theory of plant communities is usually presented as the historical prototype and a paradigmatic example of synecological organicism, characterised by the assumption that ecological communities are functionally integrated units of mutually dependent species. In this paper, I will object to this standard interpretation of Clements’s theory. Undoubtedly, Clements compares plant communities with organisms and calls them “complex organisms” and “superorganisms”. Further, he can indeed be regarded as a proponent of ecological organicism—provided (...) that one defines ecological organicism as the interpretation of synecological units according to the model of the individual organism. However, Clements’s theory does not include the assumption that mutual dependence is a principle of the organisation of plant communities. Rather, he interprets plant communities as top-down control-hierarchical entities, in which subordinate species depend on dominant species—but not the other way around. Therefore, his theory represents what may be called ‘control-hierarchical organicism’ as against ‘mutualistic organicism’. The erroneous attribution to Clements of ‘mutualistic organicism’ might be due to an unawareness of the existence of different concepts of the organism. This unawareness results in the projection on Clements’s theory of a seemingly self-evident mutualistic concept of organism that Clements himself did not use as a basis for his theory of plant communities. (shrink)