| exotic fish in exotic plantations: a multi-scale approach to understand amphibian occurrence in the mediterranean region. | globally, amphibian populations are threatened by a diverse range of factors including habitat destruction and alteration. forestry practices have been linked with low diversity and abundance of amphibians. the effect of exotic eucalyptus spp. plantations on amphibian communities has been studied in a number of biodiversity hotspots, but little is known of its impact in the mediterranean region. here, we identify the environmental factors influencing the presence of six species of amphibians (th ... | 2015 | 26061096 |
| asymmetric viability of reciprocal-cross hybrids between crested and marbled newts (triturus cristatus and t. marmoratus). | hybridization between divergent lineages often results in reduced hybrid viability. here we report findings from a series of independent molecular analyses over several seasons on four life stages of f1 hybrids between the newts triturus cristatus and t. marmoratus. these two species form a bimodal hybrid zone of broad overlap in france, with f1 hybrids making up about 4% of the adult population. we demonstrate strong asymmetry in the direction of the cross, with one class (cristatus-mothered) m ... | 2009 | 19154385 |
| the annual number of breeding adults and the effective population size of syntopic newts (triturus cristatus, t. marmoratus). | pond-breeding amphibians are deme-structured organisms with a population genetic structure particularly susceptible to demographic threats. we estimated the effective number of breeding adults (nb) and the effective population size (ne) of the european urodele amphibians triturus cristatus (the crested newt) and t. marmoratus (the marbled newt), using temporal shifts in microsatellite allele frequencies. eight microsatellite loci isolated from a t. cristatus library were used, five of which prov ... | 2001 | 11348493 |
| ultrastructure and lectin cytochemistry of the cloacal ventral glands in the male newt triturus marmoratus marmoratus. | ventral glands are found in the cloacal walls of male urodele amphibians except for sirenids. these glands are mucous, and secrete substances that will form part of the spermatophore used in transfer of sperm during fertilization. ventral glands are formed by secretory and ductal portions; both possess epithelial and myoepithelial cells with different characteristics. urodeles have cyclic reproduction, and cloacal ventral glands show seasonal differences with electron microscopy. the glycoprotei ... | 1999 | 10332729 |
| ultrastructure and lectin cytochemistry of the cloacal pelvic glands in the male newt triturus marmoratus marmoratus. | the cloacal organ of salamandridae species contains four glands: pelvic, dorsal, ventral, and kingsbury's glands. pelvic glands have been studied only by light microscopy with conventional methods, and consist of multiple tubular serous glands with a prismatic epithelium which contains numerous pas positive secretory granules. the present report is an ultrastructural and lectin cytochemistry characterization of the pelvic glands of triturus marmoratus marmoratus throughout the reproductive cycle ... | 1999 | 9972804 |
| annual changes in the number, testosterone content and ultrastructure of glandular tissue cells of the testis in the marbled newt triturus marmoratus. | the testes of 8 specimens of triturus marmoratus were collected during each month of 1987 and processed for electron microscopy and light microscopy demonstration of testosterone (t) following the abc (avidin-biotin peroxidase complex) method. according to their staining affinity for anti-t antibodies, the glandular tissue cells were classified as t-, t+, t++, and t and the annual changes in the numbers of these cell populations, as well as in the volume occupied by the glandular tissue, were ca ... | 1989 | 2630543 |
| [structure and ultrastructure of the nucleus infundibularis ventralis of triturus marmoratus (author's transl)]. | | 1980 | 6895962 |
| [ultrastructure of the hypothalamic vascular organ (paraventricular organ) and the dorsal infundibular nucleus of triturus marmoratus]. | | 1979 | 263707 |
| [ultrastructure of the preoptic recess and the vasculare organ of the terminal laminae of triturus marmoratus]. | | 1978 | 550556 |
| chromosome location of the genes for 28s, 18s and 5s ribosomal rna in triturus marmoratus (amphibia urodela). | | 1974 | 4614960 |
| [formation of vitelline plaquettes without intervention of cytoplasmic organelles in the ovocyte of triturus marmoratus latr]. | | 1972 | 4336175 |
| characterization of the lampbrush chromosomes of the marbled newt triturus marmoratus (latreille, 1800). | | 1972 | 4537502 |
| chromosomal heteromorphism and female heterogamety in the marbled newt triturus marmoratus (latreille, 1800). | | 1971 | 5139507 |
| mitotic karyotype and nucleoli of the marbled newt triturus marmoratus (latreille). | | 1971 | 5104051 |
| [corticotropic cells of the hypophysis of the triton (triturus marmoratus latr.). demonstration, by immunofluorescence, of a secretion related to the corticotropic hormone (beta-(1-24) corticotropin)]. | | 1970 | 4322169 |
| on the toxin of triturus marmoratus latr. | | 1966 | 6002971 |
| the cycle of follicular and interstitial cells (leydig cells) in the testis of the marbled newt, triturus marmoratus (caudata, salamandridae). | ultrastructural examination of the marbled newt (triturus marmoratus) testis throughout the annual cycle revealed that during the period of testicular quiescence (november-february), primordial germ cells proliferate within cords of filament-rich epithelial cells that will become follicular cells (fcs). fibroblast-like cells surround the fcs and form the lobule-boundary interstitial cells (ics). during the period of germ cell development from primordial germ cells to round spermatids (march-june ... | 1990 | 2338719 |
| characterisation of secondary spermatocytes in the marbled newt (triturus marmoratus). | secondary spermatocytes in the marbled newt (triturus marmoratus) were identified by means of cytophotometric quantification of nuclear dna in the testicular lobules containing primary spermatocytes in advanced stages of the first meiotic division (from pachytene onwards) and newly formed spermatids. the nucleus of secondary spermatocytes has an intermediate size between that of primary spermatocytes and round spermatids and was characterised by the presence of abundant masses of dense chromatin ... | 1992 | 1452485 |
| testicular cell cytoskeleton in the newt, triturus marmoratus marmoratus, during the annual cycle. | light and electron microscopy immunohistochemical studies and western blotting analysis of cytoskeletal proteins have been carried out in the testis of the marbled newt (triturus marmoratus marmoratus) during the annual testicular cycle. the present findings revealed homologies and differences with regard to those reported in the testes of mammals and other vertebrates. changes in immunohistochemical expression have also been detected in the course of the annual cycle. actin and tubulin, which w ... | 1996 | 8800756 |
| androgen receptor (ar), estrogen receptor-alpha (er-alpha) and estrogen receptor-beta (er-beta) expression in the testis of the newt, triturus marmoratus marmoratus during the annual cycle. | expression of androgen receptor (ar), estrogen receptor alpha (er-alpha) and estrogen receptor beta (er-beta) in the testis of the marbled newt (triturus marmoratus marmoratus) was investigated, with special attention to changes during the annual testicular cycle, using light microscopy immunohistochemistry and western blot analysis. primordial germ cells, primary and secondary spermatogonia and spermatocytes showed a positive reaction to the 3 receptor antibodies during the annual reproductive ... | 2001 | 11693307 |
| immunohistochemical detection of the retinoid acid receptors (rxr-alpha, -beta, -gamma) and farnesoid x-activated receptor (fxr) in the marbled newt along the annual cycle. | retinoid acid receptors (rxr-alpha, -beta, -gamma) and farnesoid x-activated receptor (fxr) expression in the testis of the marbled newt were investigated with special attention to the changes during the annual testicular cycle, using light microscopy immunohistochemistry and western blot analysis. the annual testicular cycle of the marbled newt (triturus marmoratus marmoratus) comprises three periods: (a) proliferative period (germ cell proliferation from primordial germ cells to round spermati ... | 2002 | 11984832 |
| [morphology and histochemistry of the lingual gland in the marmorated salamander (triturus marmoratus latr.)]. | | 2015 | 4410182 |
| control of the annual testicular cycle of the marbled-newt by p53, p21, and rb gene products. | p53, p21, and rb are proteins with an important role in cell-cycle control. the expression and distribution of these gene products and the apoptotic rate were studied in the marbled-newt testis along the annual cycle to know the role of these factors in the control of spermatogenesis and glandular tissue formation. the study was carried out using western blot analysis and immunohistochemistry. the results differed from those, previously reported in mammals showing constant spermatogenesis. great ... | 2002 | 12203830 |
| is dispersal guided by the environment? a comparison of interspecific gene flow estimates among differentiated regions of a newt hybrid zone. | how frequently genes pass through a hybrid zone may be influenced by the environment. accordingly, in long hybrid zones that span more than one environmental setting, different patterns may emerge. the varied conditions allow testing of hypotheses on dispersal as a function of the environment. we reconstruct the amount and direction of gene flow across a heterogeneous hybrid zone of two species of marbled newts (triturus marmoratus and triturus pygmaeus), in four widely separated areas of the ib ... | 2012 | 23013483 |
| characterization of nine new microsatellite loci for the marbled newt, triturus marmoratus. | | 2015 | 26708457 |
| advances in methods for estimating stopover duration for migratory species using capture-recapture data. | many species are migratory, resulting in a life cycle divided into periodic stages occurring in different habitats occupied for a limited amount of time. estimating the time spent in each habitat is crucial to understanding how individuals modulate their activities and thus to evolutionary ecology and conservation biology. several methods, including some recent promising advances, can be used to estimate stopover duration as well as arrival and departure probabilities at sites where individuals ... | 2017 | 28374916 |
| temporal changes in cutaneous bacterial communities of terrestrial- and aquatic-phase newts (amphibia). | animal-associated bacterial communities play essential roles for their host's ecology, physiology and health. temporal dynamics of these communities are poorly understood, but might be of high relevance for amphibians with a well-expressed biphasic biology of adults where the structure of their skin changes drastically between the aquatic and terrestrial phases. here, we investigated the temporal dynamics of cutaneous bacterial communities of lissotriton boscai and triturus marmoratus by monthly ... | 2017 | 28419728 |
| characterisation of a short, highly repeated and centromerically localised dna sequence in crested and marbled newts of the genus triturus. | a 32-33 bp highly repeated dna sequence, tks1, has been isolated from genomic dna of the newt triturus karelini digested with the restriction endonucleases haeiii or alui. tks1 is known to be localised in the centromeric heterochromatin of all the chromosomes in t. karelini and the related species t. cristatus. tks1 has been shown to be present in varying amounts in the genomic dna of a range of species of triturus, including representatives of the two main subgenera triturus and palaeotriton. a ... | 1990 | 2101348 |
| [the electrophoresis of serum proteins from triturus cristatus laur., triturus marmoratus latr. and their natural hybrid, triturus blasii of the islands]. | | 1963 | 14032942 |
| agricultural landscapes and the loire river influence the genetic structure of the marbled newt in western france. | amphibians are particularly sensitive to landscape fragmentation. potential barriers between breeding sites can negatively influence the dispersal of individuals and increase genetic structure between populations. in this study, we genotyped 10 microsatellites for 334 marbled newts (triturus marmoratus) at 11 different locations in western france. samples were collected in different regions with contrasting agricultural landscapes (low and high proportion of arable land in the north and south, r ... | 2018 | 30242196 |
| author correction: agricultural landscapes and the loire river influence the genetic structure of the marbled newt in western france. | a correction to this article has been published and is linked from the html and pdf versions of this paper. the error has been fixed in the paper. | 2018 | 30451939 |
| influence of substrate types and morphological traits on movement behavior in a toad and newt species. | inter-patch movements may lead to genetic mixing, decreasing both inbreeding and population extinction risks, and is hence a crucial aspect of amphibian meta-population dynamics. traveling through heterogeneous landscapes might be particularly risky for amphibians. understanding how these species perceive their environment and how they move in heterogeneous habitats is an essential step in explaining metapopulation dynamics and can be important for predicting species' responses to climate change ... | 2019 | 30643673 |
| [the distal hypophysis of triturus marmoratus latr.: cytology and ultrastructure]. | | 1965 | 4954275 |
| [preliminary study of the neurosecretory cells of the preoptic nuclei of triturus marmoratus l]. | | 1960 | 13756635 |
| effects of photoperiod and temperature on testicular function in amphibians. | most amphibians present an annual testicular cycle characterized by a quiescent period (late autumn-winter) and a spermatogenic period (spring and summer). at the end of the period of spermatogenesis undifferentiated interstitial cells transform into steroid-secreting leydig cells which regress in spring at the beginning of the new spermatogenetic cycle. the testicular cycle is controlled by the pituitary gonadotropin levels which are high in autumn and winter, low in spring and increase tempora ... | 1990 | 2134391 |
| heterochromatin characterization of sex chromosomes in triturus marmoratus (urodela, salamandridae). | the sex chromosomes of the iberian marbled newt, triturus marmoratus, were studied using various banding techniques, including restriction enzyme/nick translation (re/nt) procedures. four types of heterochromatin on the sex chromosomes could be distinguished: (1) distamycin a/dapi and chromomycin a3/distamycin a positive, ecori/nt negative, and haeiii/nt and hinfi/nt positive; (2) distamycin a/dapi and chromomycin a3/distamycin a positive, but re/nt negative; (3) at rich, but re/nt negative; and ... | 1992 | 1611915 |
| high pathogen prevalence in an amphibian and reptile assemblage at a site with risk factors for dispersal in galicia, spain. | ranaviruses are agents of disease, mortality and population declines in ectothermic vertebrates and emergences have been repeatedly linked to human activities. ranaviruses in the common midwife toad ranavirus lineage are emerging in europe. they are known to be severe multi-host pathogens of amphibians and can also cause disease in reptiles. recurrent outbreaks of ranavirus disease and mortality affecting three species have occurred at a small reservoir in north-west spain but no data were avail ... | 2020 | 32730306 |
| effect of photoperiod on testicular function in blinded and non-blinded marbled newts, triturus marmoratus (caudata, salamandridae). | adult male marbled newts (triturus marmoratus) were collected at the beginning of the spermatogenetic period and exposed to different photoperiods (natural photoperiod with progressively increasing daylengths, total darkness, 8l:16d, 12l:12d, 16l:8d, and continuous light) for 3 months at 20°c. to evaluate the effect of photoperiodic input via pineal gland photoreceptors, two additional groups of newts were blinded by a non-aggressive method (an elastic rubber cap was adjusted to the head to cove ... | 1989 | 29865653 |
| long day photoperiods and temperature of 20 degrees c induce spermatogenesis in blinded and non-blinded marbled newts during the period of testicular quiescence. | adult male marbled newts (triturus marmoratus) were collected at the end of the spermatogenesis period and exposed to different photoperiods (natural-daylength-simulated photoperiod, total darkness, 8l:16d, 12l:12d, 16l:8d, and continuous light) for 3 mo. temperature was maintained at 20 degrees c. two additional groups of newts were blinded and exposed to either the natural-simulated photoperiod and to 16 h of light per day respectively. quantitative histologic studies on testicular development ... | 1988 | 3196796 |
| nitric oxide synthase activity in the olfactory bulb of anuran and urodele amphibians. | nitric oxide synthase activity was studied by means of nadph-diaphorase activity and nitric oxide synthase immunoreactivity in the main and accessory olfactory bulbs of the frog rana perezi and the newt triturus marmoratus. in both species, nadph-diaphorase staining was observed in all olfactory fibers. vomeronasal fibers were nadph-diaphorase-positive in triturus but they were nadph-diaphorase-negative in rana. nitric oxide synthase immunoreactivity was not observed in the primary afferents in ... | 1996 | 8816257 |
| presence of intrachromatidic bands in mitotic chromosomes of triturus marmoratus (amphibia: caudata). | the c-banding technique has revealed the existence of single and double intrachromatidic bands in mitotic chromosomes of triturus marmoratus. the presence of the bands is discussed on the basis of the helical coil model versus the radial loop model, which assumes a different packing of the dna fiber. | 1985 | 3996547 |
| dehydration induced changes in the magnocellular preoptic nucleus of triturus marmoratus latr. | | 1984 | 6545975 |
| [structure and ultrastructure of the hipophyseal pars tuberalis of triturus marmoratus lart]. | | 1981 | 6897874 |
| structure and ultrastructure of the magnocellular preoptic nucleus or triturus marmoratus. | | 1980 | 6897800 |
| [ultrastructure of the nucleus periventricularis tuberis of triturus marmoratus (author's transl)]. | | 1980 | 6895963 |
| habitat patches for newts in the face of climate change: local scale assessment combining niche modelling and graph theory. | triturus cristatus and triturus marmoratus are two protected and declining newts occurring in the administrative department of vienne, in france. they have limited dispersal abilities and rely on the connectivity between habitats and their suitability. in a warming climate, the locations of suitable habitats are expected to change, as is the connectivity. here, we wondered how climate change might affect shifts in habitat suitability and connectivity of habitat patches, as connectivity is a key ... | 2020 | 32107433 |
| presence of low virulence chytrid fungi could protect european amphibians from more deadly strains. | wildlife diseases are contributing to the current earth's sixth mass extinction; one disease, chytridiomycosis, has caused mass amphibian die-offs. while global spread of a hypervirulent lineage of the fungus batrachochytrium dendrobatidis (bdgpl) causes unprecedented loss of vertebrate diversity by decimating amphibian populations, its impact on amphibian communities is highly variable across regions. here, we combine field data with in vitro and in vivo trials that demonstrate the presence of ... | 2020 | 33106491 |
| responses of toad tadpoles to ammonium nitrate fertilizer and predatory stress: differences between populations on a local scale. | agriculture-related pollution is among the major causes of global amphibian population declines. the multiple stressors to which amphibians are exposed in the field, such as predation pressure, can make agrochemicals far more deadly than when they act in isolation. even within a small area, diffuse agricultural pollution does not affect all aquatic environments equally, which could account for local differences in amphibian sensitivity to agrochemicals. we examined the combined effects of ammoni ... | 2011 | 21384420 |
| stabilization of a salamander moving hybrid zone. | when related species meet upon postglacial range expansion, hybrid zones are frequently formed. theory predicts that such zones may move over the landscape until equilibrium conditions are reached. one hybrid zone observed to be moving in historical times (1950-1979) is that of the pond-breeding salamanders triturus cristatus and triturus marmoratus in western france. we identified the ecological correlates of the species hybrid zone as elevation, forestation, and hedgerows favoring the more ter ... | 2017 | 28116063 |
| caenogenesis, developmental variability, and evolution in the carpus and tarsus of the marbled newt triturus marmoratus. | in this paper, after a comparative analysis of the development of triturus marmoratus, we explore the existence of caenogenetic events and their ontogenetic and phylogenetic consequences. the adult morphology of the triturus marmoratus limb, in terms of number and spatial arrangement of skeletal elements, agrees with the general pattern of urodeles. the congruence in the typical pattern of adult morphology does not hint at the striking differences in embryonic development. these differences can ... | 1992 | 28568662 |