Thuja plicata is a conifer tree that is valued for its cultural, ecological and wood quality features in its natural range in western North America and is used in Europe as an exotic timber species. It is increasingly used in mixed species forests in the UK that are managed using natural regeneration, raising questions about genetic diversity of both the adult trees and offspring of the species in these stands. We studied popu...

Aim We surveyed the empirical literature to determine how well six diversity hypotheses account for spatial patterns in species richness across varying scales of grain and extent. Location Worldwide. Methods We identified 393 analyses (‘cases’) in 297 publications meeting our criteria. These criteria included the requirement that more than one diversity hypothesis was tested for its relationship with species richness. We group...

Broad‐scale variation in taxonomic richness is strongly correlated with climate. Many mechanisms have been hypothesized to explain these patterns; however, testable predictions that would distinguish among them have rarely been derived. Here, we examine several prominent hypotheses for climate–richness relationships, deriving and testing predictions based on their hypothesized mechanisms. The ‘energy–richness hypothesis’ (also...