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)
Peres, C. A. 1997. Effects of habitat quality and hunting pressure on arboreal folivore densities in Neotropical forests: A case study of howler monkeys (Alouatta spp.). General guidelines for standardizing line-transect surveys of tropical forest primates. Neotrop.
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)
Description: In 1987 a book called Insect Outbreaks was published and became a "classic" in its field. Over the last two decades significant advances have been made in our understanding of certain aspects of insect outbreak dynamics and outbreak species and so, in this new volume, the subject is thoroughly reviewed. Whether you are interested in… (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)