A5015584449- Animal Behavior and Reproduction
- Plant and animal studies
- Avian ecology and behavior
- Animal Vocal Communication and Behavior
- Wildlife Ecology and Conservation
- Ecology and Vegetation Dynamics Studies
- Insect and Arachnid Ecology and Behavior
- Species Distribution and Climate Change
- Marine animal studies overview
- Primate Behavior and Ecology
- Amphibian and Reptile Biology
- Bird parasitology and diseases
- Genetic diversity and population structure
- Animal Ecology and Behavior Studies
- Livestock and Poultry Management
- Marine and coastal plant biology
- Marine and fisheries research
- Morphological variations and asymmetry
- Insect and Pesticide Research
- Fish biology, ecology, and behavior
- Turtle Biology and Conservation
- Identification and Quantification in Food
- Economic and Environmental Valuation
- Animal Nutrition and Physiology
- Lepidoptera: Biology and Taxonomy
Universidade de Brasília
2016-2025
Brazilian Agricultural Research Corporation
2020
University of Oklahoma
1987-1994
Queen's University
1994
Oklahoma Biological Survey
1988
Abstract A major barrier to advancing ornithology is the systemic exclusion of professionals from Global South. recent special feature, Advances in Neotropical Ornithology, and a shortfalls analysis therein, unintentionally followed long-standing pattern highlighting individuals, knowledge, views North, while largely omitting perspectives people based within Neotropics. Here, we review current strengths opportunities practice ornithology. Further, discuss problems with assessing state...
The Auk, Vol�� 125, Number 4, pages 769–777�� ISSN 0004-8038, electronic 1938-4254�� 2008 by American Ornithologists’ Union�� All rights reserved�� Please direct all requests for permission to photocopy or reproduce article content through the University of California Press’s Rights and Permissions website, http://www��ucpressjournals�� com/reprintInfo��asp�� �OI: 10��1525/au���2008��11008 Sexually elaborate traits, such as bright plumage courtship signals, are generally thought evolve...
Iridescent coloration plays an important role in the visual communication system of many animal taxa. It is known that iridescent structural colours result from layers materials with different refractive indexes, which feathers usually are keratin, melanin and air. However, these production still poorly documented. Despite great interspecific variation organization such structures bird plumage, considered too opaque, suggesting its main to delineate outermost keratin layer absorb...
Avian plumage colours are model traits in understanding the evolution of sexually selected ornamental traits. Paradoxically, iridescent structural colours, probably most dazzling these traits, remain poorly understood. Though some data suggest that expression bright produced by highly ordered arrays melanosomes and keratin is condition-dependent, almost nothing known their ontogeny thus any developmental mechanisms may be susceptible to perturbation. Here, we use light electron microscopy...
Carotenoid‐based plumage color is crucial in avian mate selection, often serving as an indicator of individual quality. To determine whether carotenoid‐derived can be a sign condition and if there relationship between individual's production, it necessary to identify how carotenoids are acquired by individuals subsequently used the organism. Our objective was carotenoid pigments stripe‐tailed yellow finch Sicalis citrina , species wherein females exhibit light yellowish ventral while males...
The communal breeding system of the Guira Cuckoo (Guira guira) was studied near Brasilia, Brazil. Guiras occurred in groups 2 to 13 adults (mode 6) 86 nests observed. Communal clutch size correlated with group size, an indirect indication that more birds contribute larger groups. Clutch varied from 4 20 eggs, but usually fewer eggs were incubated than laid, since egg tossing by common. temporal patterns laying and loss, while generally similar those other crotophagines, differed some ways....
Animal social behaviors are often mediated by signals that provide information about signaler attributes. Although some structurally simple, others temporally dynamic and multifaceted. In such cases, exaggeration of display components is likely to curtail the expression others. We quantified features acrobatic, multimodal "leap display" blue-black grassquits (Volatinia jacarina), which appears entail moderate-to-high performance levels in terms vigor skill. video recorded leap parameters...
Abstract Females of some cooperative‐breeding species can decrease their egg investment without costs for offspring because helpers‐at‐the‐nest compensate this reduction either by feeding more or better protecting from predation. We used the southern lapwing ( Vanellus chilensis ) to evaluate effects presence helpers on maternal investment. Southern lapwings are cooperative (some breeding pairs aided helpers), chick development is precocial, thus adults do not feed chicks, and offer...
The evolution of sociality in many communally breeding birds has been ascribed to a lack optimum habitat, that is, insufficient high quality resources allow dispersal and independent young. In these species, offspring do not disperse immediately, but instead remain as helpers their natal territory until opportunity occurs. We examined the habitat saturation model for South American Guira Cuckoo. This species breeds large groups composed both related unrelated individuals. Nestlings also...
The handicap principle proposes that male sexual ornaments and displays provide honest indicators of quality.Female preference for high-quality males, however, may be driven not only by genetic benefits but also indirect benefits.We investigated the impact parasitism on morphological, ornamental, behavioral characteristics female blue-black grassquits (Volatinia jacarina) in captivity.First, we tested whether morphology were influenced parasitism.Second, assessed if females attentive to...
During the reproductive season Blue-black grassquit (Volatinia jacarina) males are found in clusters, wherein they exhibit a distinctive display that consists of repeated, vertical leaps while simultaneously producing brief vocalization. The main objective this study was to describe details species' behavior "Cerrado" area central Brazil and compare these data with some studies carried out other areas. obtained concerning different aspects nesting, laying hatching were generally similar...
Duetting is a collective behavior and might have multiple functions, including joint territory defense mate guarding. An important step toward understanding the adaptive function of bird song to determine if how singing varies seasonally. However, seasonal patterns for duetting species are different from pattern described in which only male sings, because may vary according sex, role (initiator vs responder) level duet organization (individual pair). We investigated whether variation depends...
Blue-black Grassquits (Volatinia jacarina) are small, granivorous, Neotropical birds that abundant in central Brazil. During the reproductive season, socially monogamous males acquire a blue-black plumage and defend very clustered territories resemble leks. They execute conspicuous courtship display consists of leap, revealing white under-wing patches, synchronized with vocalization. We collected data on morphology behavior banded characteristics their to determine how these factors may...
ABSTRACT Nest-site choice affects individual fitness and possibly reflects natural selection of the capacity individuals to select appropriate microhabitat features. From 2003 2005, we examined nest-site characteristics nesting success Blue-black Grassquits (Volatinia jacarina) in central Brazil. We compared nest sites nonused sites, as well successful unsuccessful nests. Grassquit were structurally more complex than sites. Shrub height interaction between vegetation percentage ground...
Abstract Duetting has been intensively studied, but we still have little consensus about its fitness consequences. Some studies suggest that duetting functions in acoustic mate guarding to prevent cuckoldry (acoustic paternity hypothesis), whereas other argue is a cooperative behavior defend common resources (territory defense hypothesis). We tested these 2 hypotheses by investigating the relationships among song traits, extra-pair paternity, territory quality and reproductive success Rufous...
In this study, we investigated the role of display and mating system little known Neotropical Blue-black Grassquit (Volatinia jacarina). Males form aggregations execute a highly conspicuous display, resembling traditional leks. Number displaying males declined throughout study period, though intensity during season showed no variation. Individual had significantly different rates also defended territories very sizes, ranging from 13.0 to 72.5 m2, but found association between territory sizes...