Ornitología Neotropical (E-Journal)
Not a member yet
359 research outputs found
Sort by
PREDATION OF ATLANTIC GHOST CRABS OCYPODE QUADRATA (DECAPODA: OCYPODIDAE) BY WHITE-NECKED HAWK AMADONASTUR LACERNULATUS (ACCIPITRIFORMES: ACCIPITRIDAE) IN UBATUBA, SÃO PAULO, BRAZIL
No full textAmadonastur lacernulatus é uma ave de rapina incomum com hábitos florestais e dieta oportunista, embora pouco se saiba sobre sua presa preferida. Aqui apresentamos novas informações sobre seus hábitos alimentares: observamos um falcão-de-pescoço-branco ( Amadonastur lacernulatus ) se alimentando de caranguejos-fantasmas do Atlântico ( Ocypode quadrata ) na areia de uma praia freqüentada por humanos. A presença do gavião em local antropizado pode estar diretamente ligada à disponibilidade de presas, o que é mais uma prova da dieta oportunista da espécie e também mostra que ela pode frequentar ambientes não florestados
DIET AND FOOD RESOURCE PARTITIONING AMONG SIX IBIS SPECIES IN THE VENEZUELAN LLANOS
Get PDFThis work is the first one to provide simultaneous information on the diet of all six ibis species inhabiting the Venezuelan Llanos. For this we analyzed gizzard contents of birds collected in 1979-1982 (between 59 and 11 per species). The seasonality of the rainfall has a great influence on the prey eaten by the ibises (diet overlap between dry and wet season varied between 0.07 and 0.45 depending on the species). Main prey (in percent of prey number) for Scarlet/White ibis (Eudocimus ruber) were: Coleoptera (73%), Diptera (12%) and Heteroptera (6%) in the dry season, and Coleoptera (82%) and Odonata (9%) in the wet season. For Barefaced Ibis (Phimosus infuscatus): Coleoptera (72%) and Ephemeroptera (20%) in the dry season, and Oligochaeta (65%), Ephemeroptera (19%) and Coleoptera (14%) in the wet season. For Glossy Ibis (Plegadis falcinellus): Spinicaudata (79%), Coleoptera (18%) and plant material (18% of the total volume of food items) in the dry season, and Coleoptera (51%), Decapoda (28%), Odonata 10%) and Heteroptera (8%) in the wet season. For Sharptailed Ibis (Cercibis oxycerca): Pisces (30%), Lepidoptera (28%), Coleoptera (27%) and Orthoptera (6%) in the dry season, and Coleoptera (35%), Orthoptera (33%) and Oligochaeta (29%) in the wet season. For Buffnecked Ibis (Theristicus caudatus): Coleoptera (43%), Orthoptera (42%), Arachnida (7%) and Lepidoptera (6%) in the dry season, and Coleoptera (56%) and Orthoptera (35%) in the wet season. For Green Ibis (Messimbrinibis cayennensis): Coleoptera (75%), Gastropoda (7%) and Orthoptera (6%) in the dry season, without data in the wet season. The diet overlap between pairs of species showed low to medium values (0.13-0.44 in dry season, 0.03-0.60 in wet season). These data support the idea that the coexistence of these species is largely facilitated by food resource partitioning
FEEDING ECOLOGY OF A PARROT ASSEMBLAGE IN THE BRAZILIAN CERRADO
Get PDFIn this study, during two years, I documented the feeding habits of a parrot assemblage in response to food resources offer (abundance, nº of food species, and diversity), across a habitat mosaic in the Brazilian Cerrado. In addition, to each parrot species, I compared variations in those parameters across seasons, as well as in the feeding niche breadth. The feeding activity of every parrot species paralleled both food abundance and the number of food species available. In fact, despite fluctuations, food abundance, the number of food species, and diversity exhibited similar values through seasons, suggesting a trend for adequate food supply across the three major habitat types (palm swamp, gallery forest, and the dominant Cerrado vegetation). Excepting Orthopsittaca manilata (foraged only on Mauritia flexuosa fruit pulp), all other five species (Ara ararauna, Amazona aestiva, Alipiopsitta xanthops, Eupsittula aurea, and Diopsittaca nobilis) showed wide feeding niche breadth. Their broad diets resulted from the opportunist use of a rich collection of seasonal food species. Moreover, they presented diet association according to plant part eaten, in which parrot’s diet displayed a gradient that had an increasingly greater dominance of seeds (A. ararauna, A. aestiva, and A. aurea), to a diet composed mainly by fruit pulp and flowers (A. xanthops, and D. nobilis). The accelerated fragmentation process of the Brazilian Cerrado has been suppressing habitat types in which unpredictable and scattered food patches might be available to parrots. Thus, conservation plans should prioritize the inclusion of habitat mosaics, at least, in the form documented here. As a concern, in the smaller Cerrado remnants, food resources available may be scarce, mainly in terms of the variety and abundance year-round required by parrots
NOTES ON THE NEST AND BREEDING OF GOELDI’S ANTBIRD (AKLETOS GOELDII), A BAMBOO SPECIALIST, FROM UCAYALI, PERU
Get PDFAbstract: On 02 September 2018 we found a nest of Goeldi’s Antbird (Akletos goeldii) in a patch of Guadua bamboo. During the next week, we made regular observations of this nest, obtaining video and photographs of the nest structure, eggs, nestlings, and parental care behaviors. These data clarify previous discrepancies in reports of nest architecture for A. goeldii and deepen our knowledge of the breeding biology of this species
NESTING RECORDS OF THE TINY HAWK (ACCIPITER SUPERCILIOSUS) IN EASTERN PERU
Get PDFKnowledge about the breeding biology of the Tiny Hawk (Accipiter superciliosus) is scarce. Here we describe the discovery of two nests in the rainforest of eastern Peru. The first nest was detected during the incubation period (September 2018) at a height of 14 m above the ground on a branch bifurcation in a 20 m tall unidentified tree, at 525 m a. s. l. The second nest was detected during the fledging period (October 2020) and was located 16 m from the ground on the bifurcation of branches of a 20 m tall and 0.89 m DBH Flame tree (Erythrina velutina), at 1.070 m a. s. l. That nest had been built and occupied during the previous season by a pair of Plumbeous Kite (Ictinia plumbea). Both nests were located within remnants of secondary forest surrounded by currently or previously cultivated land. Observations are presented on the feeding behavior and nest defense
BIOLOGY OF TUMBESIAN TERRESTRIAL BIRDS, WITH COMMENTS ON REGIONAL AVIAN CONSERVATION
No full textThe Tumbesian region of Peru and Ecuador, located within a global biodiversity hotspot, is home to a large number of endemic and little-known species. Endemic terrestrial birds (tinamous, cracids, and doves) are at increased risk of extinction due to restricted distribu-tion and exposure to habitat conversion. In this study, we used 24 camera traps in Cerros de Amotape National Park (northwestern Peru) to record terrestrial birds at three sites, each representing a different forest type: dry, evergreen, and transitional forests. After 4318 camera-days of results, we obtained 334 independent events of 23 species. We describe habitat association and daily and seasonal activity patterns for Crypturellus transfasciatus, Penelope purpurascens, and four dove species (Claravis pretiosa, Leptotila pallida, L. verreauxi, and L. ochraceiventris), with opportunistic anecdotes of breeding biology and behavior. We also provide a bird conservation assessment for the region. Our results are discussed and compared with the current knowledge of Tumbesian birds
SIBLING AGGRESSION IN A NEOTROPICAL RAPTOR, BLACK-CHESTED BUZZARD-EAGLE (GERANOAETUS MELANOLEUCUS): A FIRST REPORT FOR CHILE
No full textAvian siblicide is the consequence of extreme sibling aggression in the nest. However, sibling rivalry does not always lead to brood reduction. Depending on the frequency of this behavior in the population and the results of the attacks, siblicide is classified as obligate or facultative. During one breeding season we observed the nests of two different pairs of Black-Chested Buzzard-Eagle in central Chile. The brood size of nests was of 2-3 chicks; then, 5-7 days after hatching, the first sibling aggression were observed in both nests, characterized by vigorous attacks from the both older and younger chick. This behavior extended up to 20-25 days after hatching with no brood reduction. This work represents the first detailed record of sibling aggression in a diurnal raptor in Chile, providing additional evidence for considering the Black-Chested Buzzard-Eagle as a facultative siblicide
VARIATION IN POPULATION SIZE OF THE ENDANGERED VINACEOUS-BREASTED PARROT, AMAZONA VINACEA, IN A COMMUNAL ROOST IN SOUTHERN BRAZIL
No full textThe Endangered Vinaceous-breasted Parrot, Amazona vinacea, is endemic to the Atlantic Forest. Habitat fragmentation and nest poaching have had a substantial impact on the conservation of the species. These anthropogenic factors, combined with uncertainty regarding the species’ ecology, distribution and population size, make it difficult to plan management actions. This study aimed to monitor the population size of the Vinaceous-breasted Parrot in a communal roost in southern Brazil to identify monthly and annual variation. The study also aimed to characterize the vegetation of different sites used to roost. Roost counts were performed at dawn or dusk with two observers located around the roost area. Each observer recorded the number, time and flight direction of parrots arriving or departing the roost. The highest number of individuals recorded in the roost was 184 during the non-breeding period. The months with the highest means were March, January and May, while those with the lowest were October, November and September. The number of individuals in the roost varied throughout the year, possibly due to food availability at the site. The sites frequently used as roosts were characterized by having high anthropogenic influence and the absence of an understory. The creation, maintenance and expansion of protected areas to provide food resources and nesting sites, as well as the maintenance of forest fragments in private properties, are essential for the conservation of this parrot
NOTES ON THE NESTLING BIOLOGY OF THE GOLDEN-WINGED MANAKIN (MASIUS CHRYSOPTERUS)
No full textA complete nesting information is available for 7.8% of the Manakin species; however, most of this information is fragmented and available mainly for lowland species. Hence, nesting information for highland species is scattered. Our study presents nesting information on a cloud forest Manakin species, the Golden-winged Manakin (Masius chrysopterus), which is distributed from western Colombia to northern Peru between 1000 and 2300m. We monitored 10 nests, from February through July in 2014 and 2015 at Parque Nacional Natural Tatamá, Colombia. We describe the nest, egg, and nestling, and provide information on incubation behavior and nestling feeding. The cup nest was similar to those found in most manakins. Eggs were creamy with brown spots concentrated at the base and measured 8.70± 0.89mm x 13.30 ± 0.39mm. The nestling growth rate (K) was 0.38. The incubation and nestling period were 22 and 16 days, respectively. The female conducted 70 off-bout trips day-1 that lasted on average 8.24 ± 5.44min, with 78% nest attentiveness. This study provides the most complete nesting data for a cloud forest manakin. Overall, M. chrysopterus incubation and nestling period are longer when compared to other manakin species. But the nest structure and composition, and eggs coloration concurred with other species
¿DÓNDE DUERMEN LAS AVES? OBSERVACIONES DE AVES DESCANSANDO EN EL SOTOBOSQUE DE LAS TIERRAS BAJAS DE COSTA RICA
Get PDFEl uso del hábitat nocturno de las aves diurnas es poco conocido. Este estudio presenta observaciones de los sitios de descanso y comportamiento nocturnal de 18 especies de aves en el sotobosque de las tierras bajas de Costa Rica. Realizamos muestreos nocturnos en hábitats riparios y no-riparios en potreros, bosques secundarios y bosques maduros. Observamos un mayor número de aves posadas en hábitats riparios (67) que en hábitats no riparios (3). El sotobosque ripario es utilizado por un grupo diverso de especies de aves como dormidero. Nuestras observaciones resaltan la importancia de corredores riparios, especialmente en hábitats alterados por el ser humano como los potreros