| experimental newcastle disease virus infections in three species of wild birds. | three species of wild birds--the red-winged blackbird (agelaius phoeniceus), an african weaver finch (quelea quelea), and the sandhill crane (grus canadensis)--were exposed to newcastle disease virus (ndv) to determine susceptibility and host response. the ndv used were a vaccine strain (lasota) and a viscerotropic velogenic strain (new york parrot). host response was monitored by virus isolation, signs of disease, and serologic response. both the red-winged blackbirds and the quelea shed little ... | 1979 | 486009 |
| [evaluation of bird poison residues in "millet-eaters" (quelea quelea l.). toxicologic consequences arising from the consumption of poisoned birds by domestic animals and man. 1. fenthion]. | | 1984 | 6571257 |
| [evaluation of bird poison residues in "millet-eaters" (quelea quelea l.). toxicologic consequences arising from the consumption of poisoned birds by domestic animals and man. 2. cyanophos]. | | 1984 | 6571258 |
| an aquatic toxicological evaluation of fenthion in the context of finch control in south africa. | queletox, containing fenthion as active ingredient, is the avicide formulation used in south africa to control red-billed finches (quelea quelea). control measures involve night spraying of roosting areas with a light aircraft. since roosting areas often include reedbeds along riversides and on islands, proper control is difficult without exposing the aquatic environment to some risk of contamination. this study tested the acute effects of fenthion, in association with the queletox formulation, ... | 1995 | 8521783 |
| environmental hazards of mobile ground spraying with cyanophos and fenthion for quelea control in senegal. | seven roosts of red-billed quelea, quelea quelea, in the senegal river valley and delta were visited during and after aerial or terrestrial treatments with either cyanox (cyanophos 500 g a.i. liter-1, five roosts) or queletox (fenthion 640 g a.i. liter-1, two roosts). the primary goal of the observations was to provide data on environmental effects of cyanophos after mobile ground spraying operations. twenty-six species of vertebrates (birds, reptile, fish) were found dead or debilitated near th ... | 1999 | 10330314 |
| signaling individual identity versus quality: a model and case studies with ruffs, queleas, and house finches. | we develop an evolutionary model that predicts that characters selected to signal individual identity will have properties differing from those expected for indicator signals of quality. traits signaling identity should be highly variable, often display polymodal distributions, not be condition dependent (i.e., be cheap to produce and/or maintain), not be associated with fitness differences, exhibit independent assortment of component characters, and often occur as fixed phenotypes with a high d ... | 2001 | 18707316 |
| neurotropism in blackcaps (sylvia atricapilla) and red-billed queleas (quelea quelea) after highly pathogenic avian influenza virus h5n1 infection. | the epidemiologic role of passerine birds in the spread of highly pathogenic avian influenza virus (hpaiv) remains controversial. however, confirmed natural infections with hpaiv in passeriformes, their close contact to poultry and humans, and their role as a human food source indicate a need for increased research on passerines. to date, there are only a few studies on viral shedding and pathomorphologic changes in songbirds infected with hpaiv. to investigate susceptibility, clinical outcome, ... | 2010 | 20974871 |
| new avian haemoproteus species (haemosporida: haemoproteidae) from african birds, with a critique of the use of host taxonomic information in hemoproteid classification. | abstract haemoproteus (parahaemoproteus) micronuclearis n. sp., haemoproteus (parahaemoproteus) nucleofascialis n. sp., haemoproteus (parahaemoproteus) paranucleophilus n. sp., and haemoproteus (parahaemoproteus) homobelopolskyi n. sp. (haemosporida, haemoproteidae) are described from african passeriform birds based on the morphology of their blood stages and segments of the mitochondrial cytochrome b gene. red-billed quelea quelea quelea, red-headed malimbe malimbus rubricollis and black-headed ... | 2011 | 21506819 |
| [evaluation of residues of fenthion in the millet-eater (quelea quelea l.)]. | | 2013 | 3656207 |
| sizes and numbers of nuclei in the cortex of thymus glands of red-billed weavers quelea quelea. | the cortex of the thymus glands of embryos, chicks, juveniles, fledglings and adults from several colonies of quelea quelea were studied using an image analyser (quantimet 720) to determine cell populations and nuclear sizes. just prior to hatching the lobes showed a high level of mitosis and consisted of predominantly small lymphocytes. the larger glands of chicks and juveniles had higher cell populations; pyknotic cells and erythrocytes occurred free in the cortex. the lobes of adults were mor ... | 2005 | 1201603 |
| bridge hosts for avian influenza viruses at the wildlife/domestic interface: an eco-epidemiological framework implemented in southern africa. | wild terrestrial birds can act as potential local spreaders or bridge hosts for avian influenza viruses (aivs) between waterfowl (the maintenance hosts of aivs) and domestic avian populations in which aivs may cause disease. few studies have investigated this hypothesis, although it is an important knowledge gap in our understanding of aiv spread within socio-ecosystems. we designed a simple and reproducible approach in an agro-ecosystem in zimbabwe based on: (1) bird counts at key target sites ... | 2014 | 25457135 |
| the genus biuterina fuhrmann, 1902 (cestoda, paruterinidae) in the old world: redescriptions of four species from afrotropical passeriformes. | four species of biuterina fuhrmann, 1902 (cestoda, cyclophyllidea, paruterinidae), originally described from afrotropical passeriform birds, are redescribed and figured on the basis of their type-specimens. these are b. pentamyzos (mettrick, 1960) from prionops plumata (laniidae) in zimbabwe, b. quelea (mettrick, 1963) from quelea quelea (ploceidae) in zimbabwe, b. ugandae baylis, 1919 from chalcomitra senegalensis (nectariniidae) in uganda and b. zambiensis (mettrick, 1960) from campephaga flav ... | 2002 | 12075130 |
| three new quill mite species of the genus neoaulonastus skoracki (acari: syringophilidae) parasitizing passerines in tanzania. | three new species of the genus neoaulonastus skoracki, 2004 found inside the quills of the body feathers are described: n. tanzanicus sp.nov. from euplectes axillaris (smith) (passeriformes: ploceidae), n. quelea sp.nov. from quelea quelea linnaeus (ploceidae) and n. granatina sp. nov. from granatina ianthinogaster reichenow (estrildidae). all avian hosts were captured in tanzania. key to neoaulonastus species is proposed. | 2013 | 24987778 |
| three new quill mite species of the genus neoaulonastus skoracki (acari: syringophilidae) parasitizing passerines in tanzania. | three new species of the genus neoaulonastus skoracki, 2004 found inside the quills of the body feathers are described: n. tanzanicus sp. nov. from euplectes axillaris (smith) (passeriformes: ploceidae), n. quelea sp. nov. from quelea quelea linnaeus (ploceidae) and n. granatina sp. nov. from granatina ianthinogaster reichenow (estrildidae). all avian hosts were captured in tanzania. key to neoaulonastus species is proposed. | 2012 | 24758787 |
| [aprocta cylindrica linstow, 1883, an oviparous filaria parasite of ploceid birds from tchad. larval morphogenesis (author's transl)]. | aprocta cylindrica linstow, 1883, was identified in africa (tchad) from passeriform birds ploceidae belonging to the species quelea quelea quelea (l), ploceus capitalis (latham), p. cucullatus (müller) and euplectes orix (insert). its experimental life cycle achieved in orthoptera locusta migratoria allows the study of the three first larval stages. | 2006 | 937983 |
| a study of the rete testis epithelium in several wild birds. | material from six wild non-breeding starlings (sturnus vulgaris), twelve adult wild quelea (quelea quelea) in prenuptial, full and post-breeding condition and one wild puffin (fratercula arctica) was examined by light and electron microscopy. contrary to previous accounts of avian material, the epithelium of the rete testis was composed of a mixture of numerous non-ciliated and fewer ciliated cells. both cell types contained many inclusions in the cytoplasm all of which indicated that the cells ... | 1984 | 6706832 |
| ultrastructural studies on erythropoiesis in the avian thymus. i. description of cell types. | thymus lobes from three species of birds, quelea quelea, passer domesticus and sturnus vulgaris, have been examined ultrastructurally. the component cell types are compared with their counterparts in mammalian thymus glands, and found to be similar. greater differences between small, intermediate and enlarged lobes of one species than exist between species. developing erythroid cells are present in most enlarging and some enlarged glands. they appear to be developing at the expense of lymphoid c ... | 1979 | 466697 |
| soil contamination and persistence of pollutants following organophosphate sprays and explosions to control red-billed quelea (quelea quelea). | red-billed quelea (quelea quelea) are controlled at breeding colonies and roosts by organophosphate sprays or explosions. contamination with organophosphates after sprays and with petroleum products and phthalates after explosions was assessed. | 2013 | 22588964 |
| effects of the organophosphate fenthion for control of the red-billed quelea quelea quelea on cholinesterase and haemoglobin concentrations in the blood of target and non-target birds. | the red-billed quelea bird quelea quelea is one of sub-saharan africa's most damaging pests, attacking small-grain crops throughout semi-arid zones. it is routinely controlled by spraying its breeding colonies and roosts with organophosphate pesticides, actions often associated with detrimental effects on non-target organisms. attributions of mortality and morbidity of non-targets to the sprays are difficult to confirm unequivocally but can be achieved by assessing depressions in cholinesterase ... | 2012 | 22539115 |
| candidate genes for carotenoid coloration in vertebrates and their expression profiles in the carotenoid-containing plumage and bill of a wild bird. | carotenoid-based coloration has attracted much attention in evolutionary biology owing to its role in honest, condition-dependent signalling. knowledge of the genetic pathways that regulate carotenoid coloration is crucial for an understanding of any trade-offs involved. we identified genes with potential roles in carotenoid coloration in vertebrates via (i) carotenoid uptake (sr-bi, cd36), (ii) binding and deposition (star1, mln64, star4, star5, apod, plin, gsta2), and (iii) breakdown (bco2, bc ... | 2012 | 21593031 |
| lack of genetic and plumage differentiation in the red-billed quelea quelea quelea across a migratory divide in southern africa. | a migratory divide usually signals the presence of a geographical region over which other traits, such as morphology and genotypes, also undergo rapid change. a migratory divide has been hypothesized in central southern africa for the abundant migratory weaver, the red-billed quelea quelea quelea. the positioning of the divide in the region is based on the patterns of rainfall in the region that stimulate the annual migrations of queleas. evidence indicates that premigratory queleas near the div ... | 2003 | 12535086 |
| genetic evidence for male biased dispersal in the red-billed quelea quelea quelea. | in order to detect sex-biased dispersal in the red-billed quelea quelea quelea in southern africa, we used the assignment index technique to determine the probability that individuals originated from the population in which they were sampled. this is the first time that this multilocus genetic test has been used in a bird species and is informative despite evidence that the population under study exhibits little genetic structure. there was a pattern of male-biased dispersal, the first example i ... | 2002 | 11918787 |
| ornamental plumage does not signal male quality in red-billed queleas. | sexually selected ornaments often function as condition-dependent signals of quality (or 'indicators'). when ornamentation is costly, only high-quality individuals can afford to produce the most elaborate signals. the plumage ornamentation of male red-billed queleas, quelea quelea, is an ideal candidate for an indicator because it is continuously variable, conspicuous, sexually dimorphic, is displayed only during breeding and is partially based on carotenoid pigmentation. however, i show here th ... | 2000 | 11413625 |
| [toxicity of some organophosphorus compounds and carbamates in the red-billed quelea (quelea quelea l.)]. | | 2006 | 3783490 |
| the sudan dioch (quelea quelea aethiopica) and rift valley fever. | | 1986 | 3726986 |
| agonistic experience and individual recognition in male quelea quelea. | male quelea were moved between groups to assess whether experience of winning or losing in new groups was correlated with their success in competition over food when they were returned to their original groups. no such effect was found. however, differences in time spent feeding after deprivation and in aggressive behaviour were found between groups depending on whether they were made up from high- or low-ranking individuals. in paired encounters there was no evidence that birds threatened unfam ... | 1984 | 24923828 |
| ultrastructural studies on erythropoiesis in the avian thymus. ii. a stereological analysis of the lymphoid and erythroid cells. | the cortex of enlarging thymic lobes from adult haemorrhaged quelea quelea were found to be similar to those of wild birds where the thymic enlargement was occurring naturally. a detailed stereological analysis of cells broadly designated as lymphoid, and the construction of models to account for the results, indicates that the enlarging thymic lobe contains both large and small blast cells, a heterogenous group of medium lymphocytes, erythroid cells, and two types of very small lymphocytes. the ... | 1979 | 466698 |
| emma-4 analysis of iron in cells of the thymic cortex of a weaver-bird (quelea quelea). | combined morphological and analytical studies with the emma-4 analytical electron microscope have enabled very early erythroid cells to be identified within the cortex of enlarging thymic lobes of quelea quelea. these early erythroid cells have pale cytoplasm (sometimes with ferritin-like crystals present), slightly pachychromatic nuclei and have fewer cell organelles (mitochondria) than lymphocytes. counts for iron were approximately 70% lower than counts from mature erythrocytes found free in ... | 1975 | 3812 |
| histological changes associated with enlargement and regression of the thymus glands of the red-billed quelea quelea quelea l. (ploceidae: weaver-birds). | thymic lobes form over 200 red-billed queleas, quelea quelea l., were examined histologically. samples were taken from embryos about to hatch, juveniles and adults. the lobes varied in size from very small to very enlarged (1- greater than 5 mm long). the constituent cell types are described in detail and the occurrence of these cells in different sized lobes is discussed. a cycle of events is proposed which accounts for the observations presented here. it is suggested that the large numbers of ... | 1975 | 3811 |
| morphological changes in the thymus of young and adult red-billed queleas quelea quelea (aves). | in a wild population of red-billed queleas quelea quelea l. (ploceidae: weaver-birds) sampled throughout the year in east africa, the thymus was found to enlarge in young birds shortly after hatching, remain enlarged during the juvenile stage, and regress towards the end of the postjuvenile moult. in adults, recrudescence occurred in many individuals during the prenuptial and postnuptial moults, and also in most if not all individuals, of both sexes, for a brief period during a breeding session. ... | 1975 | 3810 |
| aggression and dominance in the weaver bird, quelea quelea. | previous work on agonistic behaviour in quelea has been concerned primarily with hormonal variables. in the present series of experiments, a number of behavioural correlates of aggression and dominance are examined in male and bisexual groups. these include the effects of group arousal level on rates of agonistic encounters, the relationship between an individual's habitual level of activity and its relative dominance, aggressiveness and position on the perch in a resting "flock". the temporal p ... | 1975 | 1172393 |
| [a bird pox infection of quelea quelea (l) (passeriformes, ploceinae)]. | | 1975 | 174164 |
| the effects of luteinizing hormone, oestrogen and ovariectomy on the agonistic behaviour of female quelea quelea. | | 1973 | 4735942 |
| effects of testosterone propionate and luteinizing hormone on agonistic and nest building behaviour of quelea quelea. | | 2013 | 5691851 |
| the annual cycle of nest building and agonistic behaviour in captive quelea quelea with reference to endocrine factors. | | 2013 | 5691849 |
| evidence of an autonomous reproductive rhythm in an equatorial bird (quelea quelea). | | 1964 | 14164647 |
| effects of wholebody irradiation on the breeding plumage of the weaver finch, quelea quelea. | | 1960 | 14417954 |
| photostimulation of an equatorial bird (quelea quelea, linnaeus). | | 1956 | 13288620 |
| allelochemicals targeted to balance competing selections in african agroecosystems. | among major cereals domesticated as staple food, only sorghum has a high proportion of cultivars with condensed tannins in grain, which can trigger bitter taste perception in animals by binding to type 2 taste receptors (tas2rs). here, we report the completion of uncovering of a pair of duplicate recessive genes (tannin1 and tannin2) underlying tannin presence. three loss-of-function alleles from each gene were identified in non-tannin sorghum desired as palatable food. condensed tannins effecti ... | 2019 | 31792396 |
| expression of a carotenoid-modifying gene and evolution of red coloration in weaverbirds (ploceidae). | red carotenoid colours in birds are widely assumed to be sexually selected quality indicators, but this rests on a very incomplete understanding of genetic mechanisms and honesty-mediating costs. recent progress was made by the implication of the gene cyp2j19 as an avian carotenoid ketolase, catalysing the synthesis of red c4-ketocarotenoids from yellow dietary precursors, and potentially a major mechanism behind red coloration in birds. here, we investigate the role of cyp2j19 in the spectacula ... | 2018 | 29230900 |
| extreme hyperthermia tolerance in the world's most abundant wild bird. | the thermal tolerances of vertebrates are generally restricted to body temperatures below 45-47 °c, and avian and mammalian critical thermal maxima seldom exceed 46 °c. we investigated thermoregulation at high air temperatures in the red-billed quelea (quelea quelea), an african passerine bird that occurs in flocks sometimes numbering millions of individuals. our data reveal this species can increase its body temperature to extremely high levels: queleas exposed to air temperature > 45 °c increa ... | 2020 | 32753751 |