| [ethmoid tumors in moose and roe deer]. | ethmoid tumors are expansively-infiltratively growing tumors of carcinomatous or sarcomatous nature, deriving from the mucous membrane of the ethmoid bone. in sweden, such tumors were found in 35 elks (alces a. alces) and 4 roe deer (capreolus capreolus) during the years 1947-1982, that means a frequency of about 1 and 0.1 per cent, respectively of the investigation material. however, in the free living elk and roe deer population, the frequency might be much lower. the tumors were malign, exten ... | 1985 | 2993995 |
| recent divergence between two morphologically differentiated subspecies of bluethroat (aves: muscicapidae: luscinia svecica) inferred from mitochondrial dna sequence variation. | we assessed the mitochondrial dna sequence divergence of a 718 bp fragment of the control region and 1007 bp of the cytochrome b gene between two allopatric morphologically different subspecies of bluethroat (luscinia svecica). none of the 17 total haplotypes was shared between l. s. namnetum and l. s. svecica. however, the mean distances between subspecies were very low for both fragments (0.00168 +/- 0.00001 (mean +/- se) for the control region; 0.00306 +/- 0.00016 for the cytochrome b gene). ... | 1998 | 9532762 |
| [new species of mites of the genus ptilonyssus (gamasina: rhinonyssidae) isolated from passeriformes (aves: passeriformes) from russia and neighboring countries]. | eight new species of the genus ptilonyssus (berl. et troues.) (gamasina: rhinonyssidae) from nasal cavities of the passeriformes from territory of the former ussr are described: p. ammomani sp. n. from ammomanus deserti (alaudidae) collected in turkmenistan; p. spini sp. n. from spinus spinus (fringillidae) of kaliningrad district (russia); p. ripariae sp. n. from riparia riparia (hirundinidae) and p. acanthopneustes sp. n. from phylloscopus borealis (sylviidae) collected in tjumen district (rus ... | 2003 | 12677669 |
| a new pcr assay for simultaneous studies of leucocytozoon, plasmodium, and haemoproteus from avian blood. | many bird species host several lineages of apicomplexan blood parasites (protista spp., haemosporida spp.), some of which are shared across different host species. to understand such complex systems, it is essential to consider the fact that different lineages, species, and families of parasites can occur in the same population, as well as in the same individual bird, and that these parasites may compete or interact with each other. in this study, we present a new polymerase chain reaction (pcr) ... | 2004 | 15357072 |
| malarial infections in sedentary and migratory passerine birds in israel: description of new species. | our objective was to investigate the diversity of plasmodium species in birds of the rift valley section in israel. plasmodium merulae corradetti & scanga, 1973 was previously reported in blackbirds (turdus merula linnaeus, 1758), that are resident. we also report and describe three other species and seven new species of plasmodium from migratory birds in the north, and from eilat at the southernmost tip of the jordan valley. new species are: plasmodium lusciniae sp. n., plasmodium alloreticulat ... | 2010 | 22320017 |
| chewing lice of genus ricinus (phthiraptera, ricinidae) deposited at the zoological institute of the russian academy of sciences, saint petersburg, russia, with description of a new species. | we revised a collection of chewing lice deposited at the zoological institute of the russian academy of sciences, saint petersburg, russia. we studied 60 slides with 107 specimens of 10 species of the genus ricinus (de geer, 1778). the collection includes lectotype specimens of ricinus ivanovi blagoveshtchensky, 1951 and of ricinus tugarinovi blagoveshtchensky, 1951. we registered ricinus elongatus olfers, 1816 ex turdus ruficollis, r. ivanovi ex leucosticte tephrocotis and ricinus serratus (dur ... | 2016 | 26902646 |
| sperm performance in conspecific and heterospecific female fluid. | divergent sexual selection within allopatric populations may result in divergent sexual phenotypes, which can act as reproductive barriers between populations upon secondary contact. this hypothesis has been most tested on traits involved in precopulatory sexual selection, with less work focusing on traits that act after copulation and before fertilization (i.e., postcopulatory prezygotic traits), particularly in internally fertilizing vertebrates. however, postcopulatory sexual selection within ... | 2016 | 26855769 |
| avian clock gene polymorphism: evidence for a latitudinal cline in allele frequencies. | in comparison with most animal behaviours, circadian rhythms have a well-characterized molecular genetic basis. detailed studies of circadian clock genes in 'model' organisms provide a foundation for interpreting the functional and evolutionary significance of polymorphic circadian clock genes found within free-living animal populations. here, we describe allelic variation in a region of the avian clock orthologue which encodes a functionally significant polyglutamine repeat (clkpolyqcds), withi ... | 2007 | 17927702 |
| seventy new microsatellites for the pied flycatcher, ficedula hypoleuca and amplification in other passerine birds. | the pied flycatcher (ficedula hypoleuca) is a small migratory passerine bird commonly distributed across europe which has been the focus of considerable ecological and evolutionary research. here, we present details of 70 microsatellite markers for the species adding to the six which are currently available. sixty-six markers were also polymorphic in the closely related collared flycatcher (ficedula albicollis), while 54 were polymorphic in another related passerine, the bluethroat (luscinia sve ... | 2008 | 21585917 |
| ancestral polymorphism in exon 2 of bluethroat (luscinia svecica) mhc class ii b genes. | the genes of the major histocompatibility complex (mhc) are important model genes for understanding selective forces in evolution. here, we document, using a cloning and sequencing approach, high polymorphism at the exon 2 of the mhc class ii b (mhciib) genes in the bluethroat (luscinia svecica); a minimum of 61 unique alleles were detected in 20 individuals, and at least 11 functional loci. in addition, several pseudogenes were revealed. the specimens originated from three different bluethroat ... | 2010 | 20456568 |
| is telomere length associated with mate choice in a songbird with a high rate of extra-pair paternity? | telomere length is related to aging in many eukaryotes and the rate of telomere attrition has been suggested to reflect individual genetic quality. telomere length could thus have implications for mate choice. we investigated telomere length variation in bluethroat luscinia svecica families with mixed paternity, including social parents, extra-pair fathers and nestlings, testing whether telomere length is associated with social and/or extra-pair mate choice through assortative mating or selectio ... | 2017 | 28783753 |
| local genetic structure on breeding grounds of a long-distance migrant passerine: the bluethroat (luscinia svecica) in spain. | breeding site fidelity can be determined by environmental features, which depending on their heterogeneous distribution may shape the genetic landscape of a population. we used 10 microsatellite loci to study the genetic variation of 83 bluethroats (luscinia svecica azuricollis) across 14 localities within the spanish breeding population and assess the relative influence of different habitat characteristics (physiography and vegetation) on genetic differentiation. based on the genetic variation ... | 2012 | 23008445 |
| cell-mediated immunity and multi-locus heterozygosity in bluethroat nestlings. | recent evidence suggests that marker-based heterozygosity-fitness correlations may be driven by only one or a few markers, indicating local heterozygosity effects caused by linkage disequilibrium with functional genes. in this study, we investigated the relationship between microsatellite heterozygosity and a measure of cell-mediated immunity (phytohaemagglutinin; pha) in bluethroat (luscinia s. svecica) nestlings using a full-sibling design. we found significant positive associations between ph ... | 2009 | 19583700 |
| differential sex- and age-related migration of bluethroats luscinia svecica at eilat, israel. | this paper examines the phenology and biometrics of bluethroats staging in the eilat region. this is of special interest because of the extreme conditions with which this temperate zone breeding species has to contend because eilat is a desert habitat and is the last green area before the crossing of the deserts in autumn or after it in spring. data were collected during 20 spring and 18 autumn migration seasons in the years 1984-2003, and a total of 7,464 bluethroat were recorded. the number of ... | 2008 | 18365163 |
| multiple genetic benefits of female promiscuity in a socially monogamous passerine. | the adaptive function of female extrapair mating in socially monogamous passerines is currently debated. in the bluethroat (luscinia s. svecica), a previous study showed that offspring sired by extrapair males had a higher cell-mediated immunity than their within-pair half siblings, suggesting an immunogenetic benefit of extrapair mating in this species. here, we expanded that dataset with two more years and investigated the association between extrapair paternity and microsatellite multilocus h ... | 2008 | 18053073 |
| molecular and phenotypic divergence in the bluethroat (luscinia svecica) subspecies complex. | subspecies complexes may provide valuable insights into the early stages of the speciation process. the bluethroat (luscinia svecica) consists of many morphologically distinct subspecies that differ most strikingly in the ornamental colour pattern of the male throat. we investigated the genetic and phenotypic differentiation in this subspecies complex, using (i) microsatellite genotyping (11 loci) of a sample of 364 individuals from bluethroat populations in europe and asia, and (ii) spectrometr ... | 2006 | 17054501 |
| female throat ornamentation does not reflect cell-mediated immune response in bluethroats luscinia s. svecica. | the brilliantly coloured throat patch in male bluethroats, luscinia s. svecica, influences their social mating success and both within- and extra-pair paternity. female bluethroats are highly variable in their extent of throat coloration, from entirely drab to almost male-like. the ornament in females could be due to a genetic correlation between the sexes. however, it has been shown that male bluethroats prefer brightly coloured females, suggesting that female ornamentation has evolved by direc ... | 2005 | 16193297 |
| recent evolutionary history of the bluethroat (luscinia svecica) across eurasia. | we analysed mitochondrial dna (mtdna) sequences from 154 bluethroats (luscinia svecica) sampled at 21 sites throughout much of their eurasian range. a previously reported, single base-pair mtdna difference between l. s. svecica and l. s. namnetum was inconsistent upon expanded geographical sampling. a significant fst value (0.29) and an isolation-by-distance effect show the existence of geographical differentiation. phylogenetic analysis of haplotypes revealed northern and southern groups, altho ... | 2003 | 14629386 |
| ecological constraints on extra-pair paternity in the bluethroat. | the mating system of the bluethroat (luscinia s. svecica) involves a high level of sperm competition, and consequently a high frequency of extra-pair paternity (epp). there is considerable variation in the frequency of epp. over the course of ten study years in a population in norway, the frequency has fluctuated between 7% and 33% of young, and 8% and 76% of broods. in this paper, we address the issue of whether ecological factors can explain some of the variation in epp between years and brood ... | 2003 | 12783296 |
| female bluethroats enhance offspring immunocompetence through extra-pair copulations. | female birds frequently copulate with extra-pair males, but the adaptive value of this behaviour is poorly understood. some studies have suggested that 'good genes' may be involved, where females seek to have their eggs fertilized by high-quality males without receiving any material benefits from them. nevertheless, it remains to be shown that a genetic benefit is passed on to offspring. here we report that nestling bluethroats, luscinia svecica, sired by extra-pair males had a higher t-cell-med ... | 2000 | 10917529 |
| colour bands, mate choice and paternity in the bluethroat. | studies of several bird species have shown that coloured leg bands may affect a male's success in mate attraction and/or mating competition. from a colour band experiment in the field, we have previously reported that male bluethroats, luscinia s. svecica, with blue and orange bands (bo males) guarded their mates less intensely at the peak of female fertility, and spent more time advertising for additional mates, than males banded with non-bo colours. these responses indicated that bo males expe ... | 2000 | 10640373 |
| amplified fragment length polymorphism (aflp) markers reveal extra-pair parentage in a bird species: the bluethroat (luscinia svecica). | we tested the use of amplified fragment length polymorphism (aflp) to assess the frequency of extra-pair parentage in a bluethroat (luscinia svecica namnetum) population. thirty-six families totalling 162 nestlings were analysed. using a combination of three primer pairs, we reached an exclusion probability of 93% for the population. this probability can reach 99% considering families independently. we revealed that extra-pair fertilizations are very common: 63.8% of all broods contain at least ... | 1999 | 10447873 |
| coloured leg bands affect male mate-guarding behaviour in the bluethroat | artificial traits such as coloured leg bands may affect an individual's mating success, as shown for some birds. one explanation is that colour-matching with a sexual ornament affects the individual's sexual attractiveness. this study reports a colour-band experiment with free-living bluethroats, luscinia s. svecicaa species where males have a distinct blue and chestnut throat and upper breast. there was no apparent difference in pairing success between males with ornament-matching colour bands ... | 1997 | 9268442 |
| female bluethroats prefer males with symmetric colour bands | fluctuating asymmetry in male ornaments may be related to male quality and therefore may be used by females as a guide in mate choice. experiments on different species have shown female preferences for symmetry, but few previous studies have addressed preferences for symmetry in coloration. using the bluethroat, luscinia s. svecicaa passerine with a conspicuous blue and chestnut throat patch, as a model species, we devised an experiment in which the females could choose between males with either ... | 1997 | 9268438 |
| optimal fat loads in migrating birds: a test of the time-minimization hypothesis. | we tested the hypothesis that birds are selected to minimize the time spent on migration, that is, to migrate as fast as possible. optimal fat loads in time-selected migration were predicted for different rates of fat accumulation at stopover sites. we analyzed departure fat loads of migrating bluethroats luscinia svecica svecica, experimentally provided with extra food at a stopover site, and of migrating rufous hummingbirds selasphorus rufus, which showed considerable individual variation in f ... | 1992 | 19426051 |
| extra-pair mating in a passerine bird with highly duplicated major histocompatibility complex class ii: preference for the golden mean. | genes of the major histocompatibility complex (mhc) are essential in vertebrate adaptive immunity, and they are highly diverse and duplicated in many lineages. while it is widely established that pathogen-mediated selection maintains mhc diversity through balancing selection, the role of mate choice in shaping mhc diversity is debated. here, we investigate female mating preferences for mhc class ii (mhcii) in the bluethroat (luscinia svecica), a passerine bird with high levels of extra-pair pate ... | 2019 | 31614034 |
| isospora svecica sp. n. (apicomplexa: eimeriidae), a new species of coccidium from the white-spotted bluethroat luscinia svecica cyanecula (aves: passeriformes: muscicapidae). | using a combination of morphological and molecular data, we describe a new apicomplexan parasite, isospora svecica sp. n., from the white-spotted bluethroat, luscinia svecica cyanecula, from the czech republic. oocysts were found in its intestinal tract. sporulation was exogenous and took 1-3 days. the oocysts were slightly ellipsoidal, of average size 26.17 × 20.33 μm, with a smooth bilayered wall. micropyle, oocyst residuum, and polar granules were absent. sporocysts were bottle-shaped, of an ... | 2019 | 31471745 |
| sperm morphology, sperm motility and paternity success in the bluethroat (luscinia svecica). | postcopulatory sexual selection may select for male primary sexual characteristics like sperm morphology and sperm motility, through sperm competition or cryptic female choice. however, how such characteristics influence male fertilization success remains poorly understood. in this study, we investigate possible correlations between sperm characteristics and paternity success in the socially monogamous bluethroat (luscinia svecica svecica), predicting that sperm length and sperm swimming speed i ... | 2018 | 29509773 |
| genotyping strategy matters when analyzing hypervariable major histocompatibility complex-experience from a passerine bird. | genotyping of classical major histocompatibility complex (mhc) genes is challenging when they are hypervariable and occur in multiple copies. in this study, we used several different approaches to genotype the moderately variable mhc class i exon 3 (mhcie3) and the highly polymorphic mhc class ii exon 2 (mhciiβe2) in the bluethroat (luscinia svecica). two family groups (eight individuals) were sequenced in replicates at both markers using ion torrent technology with both a single- and a dual-ind ... | 2018 | 29435243 |