Although dramatic amphibian population declines have been reported worldwide, our
understanding of the extent of the declines in Latin America, where amphibian diversity is high, is …

… , FELIPE BOLAÑOS 2 , OSCAR VILLOTA 2 , ANDRÉS HURTADO B. , INÉS TORO 4 … F de
manera que se rechazó Ho si Fo > F (α, k, nk-1) o en forma equivalente si P-Value = P (F> Fo) …

The 5-HT1 receptor family comprises five different pharmacologic subtypes, designated 5-HT1A,
5-HT1B, 5-HT1C, 5-HT1D, and 5-HT1E, whose common property is to bind 5-HT with …

Using data for 25,780 species categorized on the International Union for Conservation of
Nature Red List, we present an assessment of the status of the world’s vertebrates. One-fifth of …

… Podríamos concluir que esta obra de Alvaro F. Bolaños abre caminos muy interesantes
para el análisis de las crónicas de los siglos XVI y XVII y para entender más a profundidad las …

We surveyed the population status of the Neotropical toad genus Atelopus, and document
recent catastrophic declines that are more severe than previously reported for any amphibian …

COLLECTING BIOLOGICAL specimens for scientific studies came under scrutiny when BA
Minteer et al.[“Avoiding (re) extinction,” Perspectives, 18 April, p. 260] suggested that this …

Systematic assessments of species extinction risk at regular intervals are necessary for
informing conservation action 1 , 2 . Ongoing developments in taxonomy, threatening processes …

… Population trends differed markedly between primary forest and abandoned cacao plantations
(F … F and P values indicate differences in trends between forest and cacao habitats. Entire …

Amphibian declines and extinctions are global and rapid: 32.5% of 5743 described species
are threatened, with at least 9, and perhaps 122, becoming extinct since 1980 (1). Species …