Thermal trait variation is of fundamental importance to forecasting the impacts of
environmental change on lizard diversity. Here, we review the literature for patterns of …

Behavioral interference between species, such as territorial aggression, courtship, and
mating, is widespread in animals. While aggressive and reproductive forms of interspecific …

Species richness is greatest in the tropics, and much of this diversity is concentrated in
mountains. Janzen proposed that reduced seasonal temperature variation selects for …

Determining how ecological and evolutionary processes produce spatial variation in local
species richness remains an unresolved challenge. Using mountains as a model system, we …

Tropical montane bird communities are hypothesized to be highly sensitive to anthropogenic
disturbance because species are adapted to a narrow range of environmental conditions …

The ecological co‐dependency between plants and hummingbirds is a classic example of a
mutualistic interaction: hummingbirds rely on floral nectar to fuel their rapid metabolisms …

Quantifying species distributions using species distribution models (SDMs) has emerged as
a central method in modern biogeography. These empirical models link species occurrence …

Abstract In 1967, Dan Janzen published “Why Mountain Passes Are Higher in the Tropics” in
The American Naturalist. Janzen's seminal article has captured the attention of generations …

Janzen's extension of the climate variability hypothesis (CVH) posits that increased
seasonal variation at high latitudes should result in greater temperature overlap across …

Innovations in nest design are thought to be one potential factor in the evolutionary success
of passerine birds (order: Passeriformes), which colonized new ecological niches as they …