Field studies were conducted on the visual and acoustic behavior of the Panamanian golden frog, Atelopus zeteki, a species lacking a tympanic middle ear. Males displayed three stereotyped behaviors in ...

Sechium edule (Jacq.) Sw. (Cucurbitaceae), a one-seeded squash most popular in Latin America, is cultivated worldwide in tropical and subtropical climates. In the past, a Mexican center of origin for ...