Wildlife managers first became interested in raptor food habits in their attempts to assess the
impact of raptors on game animals and livestock (Fisher 1893, Errington 1930), but …

The evolution of quantitative characters can be described by the equation Δz¯= GP− 1S
where Δz¯ is the vector of mean responses, G is the matrix of additive genetic variances and …

No species occurs everywhere. Indeed, the majority are absent from most places, and where
they do occur they are usually quite rare. Gaston discusses the structure of these …

Food limitation is generally thought to underlie much of the variation in life history traits of
birds. I examined variation and covariation of life history traits of 123 North American …

This paper tests the proposition that a small set of plant, animal, and abiotic processes
structure ecosystems across scales in time and space. Earlier studies have suggested that …

Analyses of statistical distributions of body mass, population density, and size and shape of
geographic range offer insights into the empirical patterns and causal mechanisms that …

Greater nest predation rates on ground-nesting birds than on off-ground-nesting birds have
long been assumed and used as an explanation for patterns such as greater cryptic and …

We re—examined the longstanding dogma that cavity—nesting birds have larger clutch
sizes than open—nesting species because of lower nest predation rates, which allow longer …

We compared a number of univariate and multivariate measures of body size used
commonly in ornithological research, including eight multivariate measures (from principal …

A long—standing hypothesis within ecology states that external environmental factors, such
as extreme temperatures, are the primary forces shaping species' biographic ranges. On a …