Reportings on hummingbirds from Northeastern Argentina

Se confirma la presencia en Argentina de Heliomaster longirostris, previamente considerada hipotética, y se reporta por primera vez a Amazilia lactea y Aphantochroa cirrochloris. La primera de las especies cuenta con documentación fílmica y fotográfica y las dos restantes con documentación fotográfica. Todas las especies son también nuevas para la provincia de Misiones. Se dan a conocer, además, registros adicionales de Chrysolampis mosquitus en el país.We confirmed the presence of Heliomaster longirostris, previously considered hypothetical, for Argentina, and reported for the first time the presence of Amazilia lactea and Aphantochroa cirrochloris. Film footage was taken of the first of these species, while all three were recorded using still photography. The three species are also new to Misiones Province. We also report new observations of Chrysolampis mosquitus for the country

Confirmation of the presence of the swallow-tailed hummingbird (Eupetomena macroura) in Argentina

Se confirma con grabaciones de video y fotografías la presencia del Picaflor Tijereta (Eupetomena macroura) en la provincia de Misiones, Argentina, en donde su presencia había sido reportada en base a un registro visual.The presence of the Swallow-tailed Hummingbird (Eupetomena macroura) has been confirmed in the province of Misiones, Argentina, with photographs and video. Previously its presence had only been recorded by one observation

Description of the chick of the Dot-winged Crake (Porzana spiloptera)

El conocimiento sobre la reproducción del Burrito Negruzco (Porzana spiloptera) es escaso. En este trabajo se describe el pichón de esta especie, detallándose el patrón de coloración del pico, que es diagnóstico en Rallidae. Se compara este carácter con el de otras especies de burritos pequeños, en particular con Laterallus jamaicensis, que posee vocalizaciones muy similares. Se descarta la posibilidad de que un espécimen de pichón de Rallidae sin asignación de especie depositado en el Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” corresponda a Porzana spiloptera.Very little is known about the breeding of the Dot-winged Crake (Porzana spiloptera). We provide a description of the chick of this species, including details on bill colour pattern that is diagnostic in Rallidae. We compare bill colour with that of other small crake species, in particular Laterallus jamaicensis, which has similar vocalizations. We confirm that an unidentified chick specimen of Rallidae at the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” is not Porzana spiloptera

The prescence of Pseudocolopteryx citreola in eastern Argentina, with comparisons of voice with other doraditos

The Ticking Doradito (Pseudocolopteryx citreola) was included in P. flaviventris until a recent taxonomic revalidation. The plumages of the two species are virtually indistinguishable and so recording their vocalizations is necessary in order to identify the species with any certainty. In Chile P. citreola is found in the centre of the country and it is a migrant but its winter distribution is unknown. In Argentina the situation is more complicated as it is possible to find this species and P. flaviventris in the same areas. In Argentina P. citreola occurs in the foothills of the Andes from Río Negro to Salta and it even reaches low lying areas in Bolivia. We present the first two recordings of P. citreola vocalizations for the eastern sector of the Southern Cone (one from eastern Entre Ríos and the other from southwestern Buenos Aires province, Argentina, both in November). We comment on potential confusions created by our new data in reference to the distribution of P. flaviventris in the Cisandean region. Possibly our new records of P. citreola records represent a west-east migration pattern. A phonetical comparation and sonograms showing the differences between the song of this species and the other Pseudocolopteryx is presented. The voices of P. citreola resemble those of P. dinellianus and (to a lesser extent) those of P. acutipennis, and are markedly different from those of P. flaviventris. The voices of P. citreola in Salta province, northwestern Argentina, are somewhat different from those elsewhere, and merit further research.Fil: López Lanús, Bernabé. Audiornis Producciones; ArgentinaFil: Unterkofler, Darío E.. Aves Argentinas; ArgentinaFil: Ornstein, Ulises. Aves Argentinas; ArgentinaFil: Güller, Roberto. Aves Argentinas; ArgentinaFil: Lejarraga, Reginaldo. No especifica;Fil: Doiny Cabre, Cristobal. No especifica;Fil: Scoffield, Rosemary L.. Refugio de Vida Silvestre Marahué; ArgentinaFil: Kopuchian, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentin

Total synthesis and isolation of citrinalin and cyclopiamine congeners

It is said that carbon, the most abundant element in organic matter, supplies life’s quantity, whereas nitrogen supplies its quality. It is therefore unsurprising that many natural products that contain basic nitrogens (alkaloids) are coveted for their benefit to human health. However, nitrogen is known to mire many chemical syntheses because of its basicity and susceptibility to oxidation. This challenge may be heightened by the presence of more than one nitrogen atom in a targeted complex alkaloid, but can be met by the selective introduction and removal of functional groups that mitigate basicity, as highlighted herein with the first chemical syntheses of citrinalin B and cyclopiamine B. The chemical connections that have been realized as a result of these syntheses, in addition to the isolation of both 17-hydroxycitrinalin B and citrinalin C through (13)C feeding studies, supports the existence of a common bicyclo[2.2.2]diazaoctane containing biogenetic precursor to these compounds as has been proposed previously