| pericardial mesothelioma in a yellow-naped amazon parrot (amazona auropalliata). | a 37-year-old female yellow-naped amazon parrot (amazona auropalliata) was presented with a history of lethargy, inappetence, and decreased vocalizations. on examination, the coelom was moderately distended and palpated fluctuant, and the heart was muffled on auscultation. coelomic ultrasound, coelomocentesis, and radiographs were performed and revealed an enlarged cardiac silhouette and marked coelomic effusion. pericardial effusion was confirmed by echocardiography. a well-circumscribed, hyper ... | 2015 | 25867668 |
| evidence for vocal learning and limited dispersal as dual mechanisms for dialect maintenance in a parrot. | studies of avian vocal dialects commonly find evidence of geographic and acoustic stability in the face of substantial gene flow between dialects. the vocal imitation and reduced dispersal hypotheses are alternatives to explain this mismatch between vocal and genetic variation. we experimentally simulated dispersal in the yellow-naped amazon (amazona auropalliata) by moving individuals within and across dialect boundaries in costa rica. one juvenile translocated across dialect boundaries altered ... | 2012 | 23139809 |
| does syntax contribute to the function of duets in a parrot, amazona auropalliata? | complex acoustic signals in many animal species are characterized by a syntax that governs how different notes are combined, but the importance of syntax to the communicative function of signals is not well understood. mated pairs of yellow-naped amazons, amazona auropalliata, produce coordinated vocal duets that are used for territory maintenance and defense. these duets follow rules that specify the ordering of notes within duets, such as a strict alternation of sex-specific notes and a define ... | 2012 | 22487728 |
| duet function in the yellow-naped amazon, amazona auropalliata: evidence from playbacks of duets and solos. | the question of why animals participate in duets is an intriguing one, as many such displays appear to be more costly to produce than individual signals. mated pairs of yellow-naped amazons, amazona auropalliata, give duets on their nesting territories. we investigated the function of those duets with a playback experiment. we tested two hypotheses for the function of those duets: the joint territory defense hypothesis and the mate-guarding hypothesis, by presenting territorial pairs with three ... | 2012 | 22162899 |
| stability and change in vocal dialects of the yellow-naped amazon. | cultural evolution is an important force in creating and maintaining behavioral variation in some species. vocal dialects have provided a useful model for the study of cultural evolution and its interactions with genetic evolution. this study examined the acoustic and geographic changes in vocal dialects over an eleven-year span in the yellow-naped amazon, amazona auropalliata, in costa rica. contact calls were recorded at 16 communal night roosts in 1994 and 19 roosts in 2005, with 12 roosts sa ... | 2008 | 19727330 |
| vocal dialects, sex-biased dispersal, and microsatellite population structure in the parrot amazona auropalliata. | geographic variation in microsatellite allele frequencies was assessed at nine sites in two regional vocal dialects of the parrot amazona auropalliata (yellow-naped amazon) to test for correspondence between dialects and population structure. there was no relationship between the genetic distances between individuals and their dialect membership. high rates of gene flow were estimated between vocal dialects based on genetic differentiation. in addition, 5.5% of pairs of individuals compared acro ... | 2005 | 15773946 |
| population genetic structure and vocal dialects in an amazon parrot. | the relationship between cultural and genetic evolution was examined in the yellow-naped amazon amazona auropalliata. this species has previously been shown to have regional dialects defined by large shifts in the acoustic structure of its learned contact call. mitochondrial dna sequence variation from a 680 base pair segment of the first domain of the control region was assayed in 41 samples collected from two neighbouring dialects in costa rica. the relationship of genetic variation to vocal v ... | 2001 | 11297178 |
| health assessment of captive psittacine species in prerelease programs at costa rican rescue centers. | with stricter laws regulating the capture and possession of wild animals in costa rica, local wildlife-rescue centers have been overwhelmed by an influx of confiscated or relinquished illegal pets, specifically of psittacine species. as part of a nationwide health-assessment program targeting these centers, 122 birds representing five psittacine species ( ara macao, amazona autumnalis, amazona auropalliata, amazona farinosa, aratinga finschi) and one hybrid macaw ( ara macao × ara ambiguus) were ... | 2017 | 29297799 |
| development and validation of 2 probe-hybridization quantitative pcr assays for rapid detection of a pathogenic coxiella species in captive psittacines. | avian coxiellosis is an emerging cause of morbidity and mortality among captive psittacines, and the utility of a rapid detection test using easily obtained samples is paramount in a clinical setting. new sequences were obtained from 3 genes: groel, dnak, and rpob. we developed probe-hybridization quantitative pcr (qpcr) assays using groel and dnak genes. samples, including splenic aspirates, liver aspirates, whole blood, and choanal, conjunctival, and cloacal swabs, were collected from 4 psitta ... | 2020 | 32188352 |
| gastrointestinal disease associated with non-albicans candida species in six birds. | a non-albicans candida species was identified in 6 birds exhibiting clinical signs associated with gastrointestinal disease. the clinical disease signs noted in these 6 birds included diarrhea, regurgitation, and melena, and were considered concurrent or identified secondary to other comorbidities. candida glabrata was identified in a yellow-naped amazon parrot (amazona auropalliata), a ring-necked dove (streptopelia capicola), a blue-and-gold macaw (ara ararauna), and 2 cockatiels (nymphicus ho ... | 2019 | 31833310 |
| diagnosis and surgical repair of an acute abdominal wall hernia and partial cloacal strangulation in a yellow-naped amazon parrot (amazona auropalliata). | a 38-year-old female, intact yellow-naped amazon parrot (amazona auropalliata) presented with an acute swelling along the ventrocaudal body wall, hematochezia, and tenesmus. physical examination identified a defect in the ventral body wall. bimodal pain management was initiated at presentation and hematochezia and tenesmus resolved. radiographic imaging and contrast fluoroscopy identified a partial cloacal strangulation. an exploratory celiotomy was performed. adhesions to the body wall were ide ... | 2018 | 31112648 |
| acute necrotizing pancreatitis in a yellow-naped amazon parrot ( amazona auropalliata). | a 25-year-old female yellow-naped amazon parrot ( amazona auropalliata) was presented for an acute onset of lethargy, ptyalism, and regurgitation. results of hematologic testing and plasma biochemical analysis revealed severe leukopenia and heteropenia with toxic heterophils and marked hyperamylasemia and hypoproteinemia, consistent with gastrointestinal dysfunction. survey radiograph findings were suggestive of coelomic effusion. results of a contrast-enhanced computed tomography (ct) scan reve ... | 2018 | 30204009 |
| frequency dispersion reveals chromophore diversity and colour-tuning mechanism in parrot feathers. | variation in animal coloration is often viewed as the result of chemically distinct pigments conferring different hues. the role of molecular environment on hue tends to be overlooked as analyses are mostly performed on free pigments extracted from the integument. here we analysed psittacofulvin pigments within parrot feathers to explore whether the in situ organization of pigments may have an effect on hue. resonance raman spectra from a red region of a yellow-naped amazon amazona auropalliata ... | 2018 | 30109049 |