| a method for estimation of fundamental frequency for tonal sounds inspired on bird song studies. | in this work a simple implementation of fundamental frequency estimation is presented. the algorithm is based on a frequency-domain approach. it was mainly developed for tonal sounds and it was used in canary birdsong analysis. the method was implemented but not restricted for this kind of data. it could be easily adapted for other sounds. python libraries were used to develop a code with a simple algorithm to obtain fundamental frequency. an open source code is provided in the local university ... | 2019 | 30671355 |
| the canary serinus canaria (passeriformes: fringillidae) as a new host for isospora bioccai in mexico. | isospora bioccai (cringoli and quesada 1991) (protozoa, apicomplexa, eimeriidae) is reported and described from captive canaries serinus canaria forma domestica (linnaeus 1758) in mexico. the oöcysts are subspherical, 25.5 × 23.5 μm, with smooth, bilayered wall, ∼1.3 μm thick. micropyle absent, oöcyst residuum absent, and polar granule present, 4-8 rice-grain-shaped. sporocysts are ovoidal, 16.7 × 10.5 μm. stieda body knob-like and substieda body trapezoidal of irregular base. sporocyst residuum ... | 2018 | 30533383 |
| consistency of female preference for male song in the domestic canary using two measures: operant conditioning and vocal response. | variation of female preferences is often reported in the literature and could be related to an artefact derived from multiple different methods used. thus, there is a need to evaluate the influence of different methods when assessing female preferences. the present study aims to compare female preferences obtained from an operant conditioning test and from female vocal responses to male song in the domestic canary (serinus canaria). in an operant conditioning test, females had the possibility to ... | 2018 | 30355508 |
| 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, ... | 2018 | 30323842 |
| 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 ... | 2018 | 30019333 |
| 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 ... | 2018 | 29912975 |
| 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 ... | 2018 | 29845414 |
| 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 ... | 2018 | 29744700 |
| 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 ... | 2018 | 29720195 |
| 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 ... | 2018 | 29679614 |
| 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 ... | 2018 | 29641795 |
| 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 ... | 2016 | 30128140 |