| subalar cutaneous cysts with harpirhynchus nidulans in bearded tits and hawfinches in central europe. | in wild bearded tits (panurus biarmicus) and hawfinches (coccothraustes coccothraustes) trapped in the czech republic and slovakia from 1999 to 2003, characteristic yellow thin-walled subalar cutaneous cysts filled with friable material containing mites harpirhynchus nidulans were found. the biggest cysts were 14 mm and 20 mm in size in bearded tits and in hawfinches, respectively. histologically, the relatively thick wall of cysts contained erythrocytes (extravased or in small vessels) and hete ... | 2005 | 15763736 |
| context-dependent female preference for multiple ornaments in the bearded reedling. | while it is well established that females prefer to mate with well-ornamented males, the influence of perceptive and cognitive processes on the expression of female mate choice is still poorly known. it has been suggested that the female perception of a male's attractiveness is not absolute, but depends on the other males with which he is compared that have been previously encountered (comparative evaluation). we investigated whether mate preference in bearded reedlings (panurus biarmicus) is de ... | 2016 | 26843933 |
| bearded reedlings adjust their pair-bond behaviour in relation to the sex and attractiveness of unpaired conspecifics. | an individual's investment in mating or keeping a pair bond intact may be influenced not only by the attractiveness of its current mate, but also by that of other potential mates. in this study, we investigated the effect of relative attractiveness on pair-bond behaviour in bearded reedlings, panurus biarmicus. we showed that mate attractiveness, in terms of beard length in males and tail length in females, influenced courtship behaviour when the pair was kept isolated. in the presence of a cons ... | 2012 | 22393449 |
| copulation rate and sperm use by female bearded tits, panurus biarmicus. | we examined functional and mechanistic aspects of sperm competition in the bearded tit by determining (1) the variation in copulation rate between birds breeding alone or with other males present, and (2) the number of sperm present in the female reproductive tract estimated from the number of sperm trapped on the perivitelline layers of eggs. females copulated at a higher rate with their partner when other males were present, but this did not translate into more sperm on eggs, possibly because ... | 1998 | 9819336 |
| inference of pair bonds from capture data based on low variation of the sex ratio among catches. | paired individuals of monogamous animal species often stay in close contact when moving in their home range and can be caught together if sampling is done by a method that does not disrupt their spatial association (e.g., capture of birds by mist nets). we propose a statistical procedure that uses the counts by sex of specimens in a number of samples to detect the presence of pairs and to roughly estimate the proportion of paired individuals in the population. this method appears to be efficient ... | 1992 | 19426052 |
| extremely low malaria prevalence in a wetland specialist passerine. | avian malaria (caused by plasmodium spp.) and avian malaria-like infections (caused by haemoproteus spp.) are widespread and can seriously affect the health of their bird hosts, especially of immunologically naïve individuals. therefore, these parasites have long been in the focus of bird-parasite studies. however, the species richness and diversity of these protozoan species have only been revealed since the use of molecular techniques. diversity and prevalence of these parasites among differen ... | 2020 | 31455438 |
| exploring the mechanistic link between corticosterone and insulin-like growth factor-1 in a wild passerine bird. | physiological regulators of life history trade-offs need to be responsive to sudden changes of resource availability. when homeostasis is challenged by unpredictable stressors, vertebrates respond through a set of physiological reactions, which can promote organismal survival. glucocorticoids have been traditionally recognized as one of the main regulators of the physiological stress response, but the role of an evolutionarily more conserved pathway, the hypothalamic-pituitary-somatotropic (hps) ... | 2018 | 30581657 |