—I provide a detailed description of an arthropod sampling technique, ‘‘branch clipping,’’ and evaluate its efficacy in measuring food availability for three foliage-gleaning migratory warbler species wintering in Jamaica. I incorporated foraging observations into the sampling protocol to facilitate a match between the distribution of branch-clip samples and the distribution of warbler foraging...

Methods for monitoring bird nests might influence rates of nest predation, but the effects of various methods (e.g., visual markers and observer visitation rates) are often separately investigated among disparate avian taxa and geographic regions. Few investigators have explored the potential effects observers might have on nest success of grassland birds, despite concerns regarding population ...

--Field ornithologists frequently quantify the fat reserves of smallto mediumsized birds by assigning a numerical rank to visible subcutaneous fat. Despite the significance and widespread application of this method, relatively few studies have tested its underlying assumptions. Using wintering Dark-eyed Juncos, Junco hyemalis, the visible fat-class method was evaluated in four ways. (1) The rel...

Roads through tropical forest create linear disturbances that have unknown consequences for forest birds. We studied how a narrow, rarely used road through otherwise undisturbed Amazonian forest affected the movements and area requirements of understory birds that form mixed-species flocks. Differences in road maintenance led to two distinct treatments along the same road. Trees along the “clos...

Many birds undergo bare part color changes during the breeding season. Most investigators have focused on color as a signal of individual quality. An alternative, but not exclusive, function of bare part color may be signaling readiness to breed, especially in colonial, asynchronous breeders. White Ibises (Eudocimus albus) are colonial waterbirds that show vivid bare part colors on their bills ...

Se documenta la diversidad de aves en Facultad Estudios Superiores Zaragoza campus II, Ciudad México, entre 1998 y 2006. llevaron a cabo registros visuales auditivos mediante el método trayectos sin estimar distancia. La riqueza avifaunística fue 58 especies pertenecientes 47 géneros 25 familias. Del total registradas, 36 fueron residentes 22 migratorias. Las áreas verdes las zonas urbanas prop...

The main cause of nest mortality for most bird species is predation and nest survival rates often vary in relation to time-specific variables. Few investigators have examined time-specific patterns of nest survival in Neotropical birds, and most such studies have focused on tropical and subtropical species. To better understand agerelated patterns of nest survival, we studied nest survival of R...

O objetivo do estudo é avaliar a temperatura corporal de quatro linhagens frangos caipiras criados em sistema semi-intensivo. experimento foi realizado um galpão experimental na cidade Parauapebas - PA, e os dados fisiológicos dos foram coletados três períodos, 15-17 dias fase inicial 44-45 71-73 idade engorda. desenvolvido com o intuito efeito das condições climáticas da região amazônica, que ...

Foram utilizadas alças intestinais de aves capturadas no Parque Zoobotânico (PZ), e depositadas catalogadas Laboratório Ornitopatologia, para identificação taxonômica dos espécimes parasitos encontrados, em fragmentos florestais. A partir da abertura destas intestinais, procedeu-se às coletas processamento material exames laboratoriais. Esse processo permitiu realizar um levantamento das princi...