| [ilheus arbovirus in wild birds (sporophila caerulescens and molothrus bonariensis)]. | to report the first ilheus arboviruses isolated from wild birds and analyze its public health impact. | 2001 | 11359196 |
| The interplay between gonadal steroids and immune defence in affecting a carotenoid-dependent trait. | The hypothesis that sexual ornaments are honest signals of quality because their expression is dependent on hormones with immune-depressive effects has received ambiguous support. The hypothesis might be correct for those signals that are carotenoid-dependent because the required carotenoid deposition in the signal, stimulated by testosterone, might lower the carotenoid-dependent immune defence of the organism. Two pathways underlying this androgen-dependent honest signaling have been suggested. ... | 2011 | 21957328 |
| an outbreak of mycobacterium genavense infection in a flock of captive diamond doves (geopelia cuneata). | two diamond doves (geopelia cuneata) in a flock of 23 birds housed in an aviary in a zoo in central japan were found dead as a result of mycobacteriosis. fecal samples of the remaining doves were positive for mycobacterial infection, and thus they were euthanatized. clinical signs and gross pathology, including weight loss and sudden death and slight enlargement of the liver and intestine, were observed in a small number of birds (3/23). disseminated histiocytic infiltration of either aggregates ... | 2014 | 25518432 |
| stress responses to heat exposure in three species of australian desert birds. | birds need to respond to weather changes quickly and appropriately for their own well-being and survival. the inability to respond appropriately to heat waves can be fatal to individual birds and can translate into large-scale mortality events. we investigated corticosterone (cort) and heterophil∶lymphocyte (h∶l) ratio responses of budgerigars (melopsittacus undulatus), zebra finches (taeniopygia guttata), and diamond doves (geopelia cuneata) to heat exposures. the birds were exposed to a temper ... | 2017 | 28384428 |
| kinematics and aerodynamics of avian upstrokes during slow flight. | slow flight is extremely energetically costly per unit time, yet highly important for takeoff and survival. however, at slow speeds it is presently thought that most birds do not produce beneficial aerodynamic forces during the entire wingbeat: instead they fold or flex their wings during upstroke, prompting the long-standing prediction that the upstroke produces trivial forces. there is increasing evidence that the upstroke contributes to force production, but the aerodynamic and kinematic mech ... | 2015 | 26089528 |
| transition from wing to leg forces during landing in birds. | transitions to and from the air are critical for aerial locomotion and likely shaped the evolution of flying animals. research on take-off demonstrates that legs generate greater body accelerations compared with wings, and thereby contribute more to initial flight velocity. here, we explored coordination between wings and legs in two species with different wingbeat styles, and quantified force production of these modules during the final phase of landing. we used the same birds that we had previ ... | 2014 | 24855670 |
| transition from leg to wing forces during take-off in birds. | take-off mechanics are fundamental to the ecology and evolution of flying animals. recent research has revealed that initial take-off velocity in birds is driven mostly by hindlimb forces. however, the contribution of the wings during the transition to air is unknown. to investigate this transition, we integrated measurements of both leg and wing forces during take-off and the first three wingbeats in zebra finch (taeniopygia guttata, body mass 15 g, n=7) and diamond dove (geopelia cuneata, body ... | 2012 | 22972887 |
| interaction between sexual steroids and immune response in affecting oxidative status of birds. | one hypothesis explaining the honesty of secondary sexual traits regulated by testosterone (t) is that t can impair the balance between pro-oxidant compounds and antioxidant defences, favouring a status of oxidative stress that only good quality individuals can sustain (oxidative handicap hypothesis). in the present study, we evaluated for the first time the effects of sexual steroids, t and its metabolites 5-α-dihydrotestosterone (dht) and estradiol (e2) on oxidative damage and plasma non-enzym ... | 2012 | 22885344 |
| differential effects of testosterone, dihydrotestosterone and estradiol on carotenoid deposition in an avian sexually selected signal. | recent studies have demonstrated that carotenoid-based traits are under the control of testosterone (t) by up-regulation of carotenoid carriers (lipoproteins) and/or tissue-specific uptake of carotenoids. t can be converted to dihydrotestosterone (dht) and estradiol (e2), and variation in conversion rate may partly explain some contradictory findings in the literature. moreover, most studies on the effect of t on sexual signals have focused on the male sex only, while in many species females sho ... | 2011 | 20824278 |
| life in extreme environments: investigations on the ecophysiology of a desert bird, the australian diamond dove (geopelia cuneata latham). | the diamond dove, geopelia cuneata, is the world's second smallest (ca. 35 g) species of the columbid order. the diamond dove is endemic in the arid and semiarid mulga and spinifex regions of central and western australia. it regularly encounters ambient temperatures (t a ) in its habitat above +40° c, especially when foraging for seeds on bare ground cover, and may be found at up to 40 km from water. this entails extreme thermal stress, with evaporative cooling constrained by limited water supp ... | 1991 | 28312733 |
| bird fancier's lung caused by diamond dove. | | 2013 | 23880614 |
| organ histopathology and hematological changes associated with heat exposure in australian desert birds. | an inability of the body to appropriately respond to extreme temperatures will result in pathological changes to vital organs and adverse hematological changes. mild heat exposure of a bird to a temperature above the zone of thermoneutrality can induce subclinical heat stress, which may be a precursor to illness. the ability to identify subtle changes that may be associated with subclinical heat stress can be important in early diagnosis and treatment of heat stress in birds. pathological change ... | 2020 | 32237681 |
| chlamydiosis in a gouldian finch (erythrura gouldiae). | avian chlamydiosis is an infection caused by obligate intracellular and gram-negative bacteria belonging to the family chlamydiaceae and has been reported in more than 450 avian species distributed in 30 orders. in particular, a high prevalence of infection has been demonstrated in wild passerine populations, including both asymptomatic and clinically ill individuals, suggesting a role of these avian species as important carriers. in may 2018, avian chlamydiosis was diagnosed in a 1-year-old mal ... | 2020 | 32550623 |
| whole-body 3d kinematics of bird take-off: key role of the legs to propel the trunk. | previous studies showed that birds primarily use their hindlimbs to propel themselves into the air in order to take-off. yet, it remains unclear how the different parts of their musculoskeletal system move to produce the necessary acceleration. to quantify the relative motions of the bones during the terrestrial phase of take-off, we used biplanar fluoroscopy in two species of birds, diamond dove (geopelia cuneata) and zebra finch (taeniopygia guttata). we obtained a detailed 3d kinematics analy ... | 2018 | 29330588 |
| a dynamics and stability framework for avian jumping take-off. | jumping take-off in birds is an explosive behaviour with the goal of providing a rapid transition from ground to airborne locomotion. an effective jump is predicated on the need to maintain dynamic stability through the acceleration phase. the present study concerns understanding how birds retain control of body attitude and trajectory during take-off. cursory observation suggests that stability is achieved with relatively little cost. however, analysis of the problem shows that the stability ma ... | 2018 | 30473867 |
| coping with compliance during take-off and landing in the diamond dove (geopelia cuneata). | the natural world is filled with substrates of varying properties that challenge locomotor abilities. birds appear to transition smoothly from aerial to terrestrial environments during take-offs and landings using substrates that are incredibly variable. it may be challenging to control movement on and off compliant (flexible) substrates such as twigs, yet birds routinely accomplish such tasks. previous research suggests that birds do not use their legs to harness elastic recoil from perches. gi ... | 2018 | 30044804 |