The high alpha-diversity of tropical forests has been amply documented, but beta-diversity-how species composition changes with distance-has seldom been studied. We present quantitative estimates of beta-diversity for tropical trees by comparing species composition of plots in lowland terra firme forest in Panama, Ecuador, and Peru. We compare observations… (More)
In a system of N populations of n reproductive individuals apiece, in which each population has constant variance v(2) and lasts L generations, group selection on a quantitative character has a reasonable chance of overriding selection within populations if (and only if) the populations never exchange migrants, each population is founded by colonists from a… (More)
We describe the analogy between the theory of natural selection on sex ratio in newborn gonochores (which will not change sex), and on the age of sex change in sequential hermaphrodites (which are all born into one sex and change to the other later on). We also discuss the conditions under which natural selection favors sequential hermaphrodites over… (More)
MacArthur and Levins suggested that species persist by specializing as much as variation in their environments allows, thus avoiding competitive displacement. Accordingly, more species should coexist in stabler environments. Empirical analyses of trade-offs suggest that, indeed, 'the jack of all trades is master of none'. Diversity represents a balance… (More)
We use Hubbell's neutral theory to predict the impact of habitat fragmentation on Amazonian tree communities. For forest fragments isolated for about two decades, we generate neutral predictions for local species extinction, changes in species composition within fragments, and increases in the probability that any two trees within a fragment are… (More)
In this book, Robert Asher reviews some of the overwhelming evidence for evolution, explains why evolutionary biology should pose no threat to Christian faith, and refutes oft-repeated criticisms of evolution by natural selection that many non-biologists find convincing. Asher does a wonderful job with the evidence for evolution , although non-biologists… (More)
The Good, the True and the Beautiful: A Neuronal Approach, by Jean-Pierre Changeux. New Haven, CT: Yale University Press and Paris: Editions Odile Jacob. 2012. pp. xii + 386. ISBN 978-0-300-16139-7. H/b $38.00.
Mind and Cosmos: Why the Materialist NeoDarwinian Conception of Nature is Almost Certainly False, by Thomas Nagel. New York: Oxford University Press, 2012. Pp. x + 130. ISBN 978-0-19-991975-8. Hb, $24.95. Are You an Illusion?, by Mary Midgley. New York, NY: Routledge. 2014. Pp. viii + 167. ISBN 978-1-84465-792-6. Pb, $23.95