Publications

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sex-specific effects of inbreeding and early life conditions on the adult oxidative balance.inbreeding negatively affects various life-history traits, with inbred individuals typically having lower fitness than outbred individuals (= inbreeding depression). inbreeding depression is often emphasized under environmental stress, but the underlying mechanisms and potential long-lasting consequences of such inbreeding-environment interactions remain poorly understood. here, we hypothesize that inbreeding-environment interactions that occur early in life have long-term physiological effects, ...201830323842
reproductive disorders in domestic canaries (serinus canarius domesticus): a retrospective study on bacterial isolates and their antimicrobial resistance in italy from 2009 to 2012.reproductive disorders are responsible for significant economic losses in canary aviculture due to embryo and newborn chick mortality. most of the time, deaths are caused by bacterial pathogens, however little published data exist about the prevalence of bacterial isolates that are identified during diagnostic protocols. this study reports on data collected from previous investigations carried out on cloacal swabs (n 456), unhatched eggs (n 52), and dead newborn chicks (n 68) collected from cana ...201830019333
an experimental study: does inbreeding increase the motivation to mate?inbreeding is a central topic in evolutionary biology and ecology and is of major concern for the conservation of endangered species. yet, it remains challenging to comprehend the fitness consequences of inbreeding, because studies typically focus only on short-term effects on inbreeding in the offspring (e.g. survival until independence). however, there is no a priori reason to assume that inbreeding has no more effects in adulthood. specifically, inbred males should have lower reproductive suc ...201829912975
avian malaria co-infections confound infectivity and vector competence assays of plasmodium homopolare.currently, there are very few studies of avian malaria that investigate relationships among the host-vector-parasite triad concomitantly. in the current study, we experimentally measured the vector competence of several culex mosquitoes for a newly described avian malaria parasite, plasmodium homopolare. song sparrow (melospiza melodia) blood infected with a low p. homopolare parasitemia was inoculated into a naïve domestic canary (serinus canaria forma domestica). within 5 to 10 days post infec ...201829845414
the effect of dietary antioxidant supplementation in a vertebrate host on the infection dynamics and transmission of avian malaria to the vector.host susceptibility to parasites is likely to be influenced by intrinsic factors, such as host oxidative status determined by the balance between pro-oxidant production and antioxidant defences. as a result, host oxidative status acts as an environmental factor for parasites and may constrain parasite development. we evaluated the role of host oxidative status on infection dynamics of an avian malarial parasite by providing canaries (serinus canaria) with an antioxidant supplementation composed ...201829744700
characterization of plasmodium relictum, a cosmopolitan agent of avian malaria.microscopic research has shown that plasmodium relictum is the most common agent of avian malaria. recent molecular studies confirmed this conclusion and identified several mtdna lineages, suggesting the existence of significant intra-species genetic variation or cryptic speciation. most identified lineages have a broad range of hosts and geographical distribution. here, a rare new lineage of p. relictum was reported and information about biological characters of different lineages of this patho ...201829720195
the regulation of birdsong by testosterone: multiple time-scales and multiple sites of action.contribution to special issue on fast effects of steroids. sex steroid hormones act during early development to shape the circuitry upon which these same hormones act in adulthood to control behavioral responses to various stimuli. the "organizational" vs. "activational" distinction was proposed to explain this temporal difference in hormone action. in both of these cases steroids were thought to act genomically over a time-scale of days to weeks. however, sex steroids can affect behavior over s ...201829679614
detection and molecular characterization of cryptosporidium spp. in captive canaries (serinus canaria) using different diagnostic methods.this study used several diagnostic methods to examine the occurrence of and molecularly characterize cryptosporidium spp. in captive canaries (serinus canaria) in southern and southeastern brazil. a total of 498 fecal samples were purified by centrifugal-flotation using sheather's solution. cryptosporidium spp. diagnosis was performed using three diagnostic methods: malachite green negative staining, nested pcr targeting the 18s rrna gene, followed by sequencing the amplified fragments, and dupl ...201829641795
a loss of heterozygosity, a loss in competition? the effects of inbreeding, pre- and postnatal conditions on nestling development.the early developmental trajectory is affected by genetic and environmental factors that co-depend and interact often in a complex way. in order to distinguish their respective roles, we used canaries (serinus canaria) of different genetic backgrounds (inbred and outbred birds). an artificial size hierarchy was created to provoke within-nest competition, manipulating postnatal conditions. to this end, inbred birds were weight-matched with outbred birds into duos, and each nest contained one duo ...201630128140
sex-and region-dependent expression of the autism-linked adnp correlates with social- and speech-related genes in the canary brain.the activity-dependent neuroprotective protein (adnp) syndrome is an autistic-like disorder, instigated by mutations in adnp. this syndrome is characterized by developmental delays, impairments in speech, motor function, abnormal hearing, and intellectual disabilities. in the adnp-haploinsufficient mouse model, many of these impediments are evident, appearing in a sex-dependent manner. in zebra finch songbird (zf; taeniopygia guttata), an animal model used for song/language studies, adnp mrna mo ...202032926339
outbreak of systemic avian pox in canaries (serinus canaria domestica) associated with the b1 subgroup of avian pox viruses.this study reports an outbreak of avian pox in a quarantine of canaries imported from europe, with a mortality of 30% and clinical signs of dyspnea and blepharoconjunctivitis. during necropsy, beak cyanosis, serous blepharitis, caseous sinusitis, oropharyngitis, tracheitis, pulmonary edema, pneumonia, fibrinous airsacculitis, and splenomegaly were observed. microscopically, edema, epithelial hyperplasia, hydropic degeneration, and vacuolated eosinophilic intracytoplasmic inclusion bodies were fo ...201931967439
domestic canaries (serinus canaria forma domestica) are susceptible to low pathogenic avian influenza virus infections.avian influenza viruses have been isolated from many bird species; however, little is known about the susceptibility of pet birds to low pathogenic avian influenza (lpai) viruses. to address this research gap, domestic canaries (serinus canaria forma domestica) were experimentally infected with h5 and h7 lpai viruses to determine susceptibility and to evaluate samples for diagnostic purposes. clinical evidence of infection (e.g. ruffled plumage and apathy) and mortality were noted for the canari ...201830207746
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