The species concept is the cornerstone of biodiversity science, and any paradigm shift in the
delimitation of species affects many research fields. Many biologists now are embracing a …

Climate change is altering conditions in high‐elevation streams worldwide, with largely
unknown effects on resident communities of aquatic insects. Here, we review the challenges …

Species' geographic ranges are limited by climate and species interactions. Climate is the
prevailing explanation for why species live only within narrow elevational ranges in …

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 …

Abstract 'Cryptic'species are an emerging biological problem that is broadly discussed in the
present study. Recently, a cryptic species definition was suggested for those species which …

Global warming is increasing mean temperatures and altering temperature variability at
multiple temporal scales. To better understand the consequences of changes in thermal …

Species are a fundamental unit of biodiversity that are delimited via genetic data and
coalescent-based methods with increasing frequency. Despite the widespread use of …

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 …

Abstract Eriophyoid mites (Acari: Eriophyoidea) are among the smallest of terrestrial
arthropods and the most species‐rich group of herbivorous mites with a high host specificity …