Online research in philosophy

Sober (1992) has recently evaluated Brandon's (1982, 1990; see also 1985, 1988) use of Salmon's (1971) concept of screening-off in the philosophy of biology. He critiques three particular issues, each of which will be considered in this discussion.

I address David Hull's theses about the process of science from the perspective of an evolutionary biologist, particularly emphasizing phylogenetic systematics (a.k.a. cladistics), an area that has figured prominently in Hull's work as a source of both sociological data and metatheory. The goal is to carefully explore analogies and disanalogies between scientific process and comparative biology. There do seem to be remarkable analogies (e.g., research groups as lineages, scientists as interactors in selection processes), indeed these lead to important insights (...) that might not otherwise have been made, yet some possible analogies present novel problems: Are "memes" like genes or like traits? What is the nature of replication in science? It is argued that the primary need is for some rigorously worked-out case studies. (shrink)

The concept of individuality as applied to species, an important advance in the philosophy of evolutionary biology, is nevertheless in need of refinement. Four important subparts of this concept must be recognized: spatial boundaries, temporal boundaries, integration, and cohesion. Not all species necessarily meet all of these. Two very different types of pluralism have been advocated with respect to species, only one of which is satisfactory. An often unrecognized distinction between grouping and ranking components of any species concept is necessary. (...) A phylogenetic species concept is advocated that uses a (monistic) grouping criterion of monophyly in a cladistic sense, and a (pluralistic) ranking criterion based on those causal processes that are most important in producing and maintaining lineages in a particular case. Such causal processes can include actual interbreeding, selective constraints, and developmental canalization. The widespread use of the biological species concept is flawed for two reasons: because of a failure to distinguish grouping from ranking criteria and because of an unwarranted emphasis on the importance of interbreeding as a universal causal factor controlling evolutionary diversification. The potential to interbreed is not in itself a process; it is instead a result of a diversity of processes which result in shared selective environments and common developmental programs. These types of processes act in both sexual and asexual organisms, thus the phylogenetic species concept can reflect an underlying unity that the biological species concept can not. (shrink)