| epitheliophagy: intrauterine cell nourishment in the viviparous alpine salamander, salamandra atra (laur.). | the intrauterine nourishment of the viviparous alpine salamander, salamandra atra, has been demonstrated to consist of two phases: oophagy - after hatching from the jelly membrane, the developing embryo ingests the remaining disintegrated, unfertilized egg mass. epitheliophagy - a special cranial portion of the uterus wall, the zona trophica, is stimulated by the presence of the embryo. after the yolk mass has been exhausted, the developing embryo is supplied with epithelial cells as nourishment ... | 2013 | 3780941 |
| comparative ultrastructural investigations of the uterine epithelium in the viviparous salamandra atra laur. and the ovoviviparous salamandra salamandra (l.) (amphibia, urodela). | the uterine epithelium of the viviparous salamandra atra and the ovoviviparous salamandra salamandra was studied in non pregnant and ovulating females and in females during different stages of pregnancy. the epithelium of both species is organized in a monolayer. the epithelial cells are characterized by a moderate secretory activity, a variable amount of apical granules which include pas-positive material and by some apical and basal exo- or endocytotic vesicles. adjacent cells are joined by ju ... | 1992 | 195733 |
| [role of the oviduct in uterine uniparity in the black salamander of the eastern alps (salamandra atra laur.)]. | | 1962 | 13926049 |
| [on the gestation of the black salamander of the alps, salamandra atra laur]. | | 1960 | 13842326 |
| | 1. the q o2 of salamandra atra and triturus alpestris varies with season. this periodicity appears to be largely endogenous, but in autumn an exogenous cold stimulus is required for the animals to enter the winter phase. 2. cold (10°) acclimation stimulates q o2 of t. alpestris in spring and autumn, whereas in summer q o2 is stimulated by warm (20°) acclimation. 3. in both species respiration of winter animals is insensitive to acute temperature increases from 5 to 15°. 4. if for several days th ... | 1974 | 28308631 |
| sex-specific estimates of dispersal show female philopatry and male dispersal in a promiscuous amphibian, the alpine salamander (salamandra atra). | amphibians display wide variations in life-history traits and life cycles that should prove useful to explore the evolution of sex-biased dispersal, but quantitative data on sex-specific dispersal patterns are scarce. here, we focused on salamandra atra, an endemic alpine species showing peculiar life-history traits. strictly terrestrial and viviparous, the species has a promiscuous mating system, and females reproduce only every 3 to 4 years. in the present study, we provide quantitative estima ... | 2012 | 22934886 |
| genetic variation in an endemic salamander, salamandra atra, using amplified fragment length polymorphism. | the pattern of genetic differentiation of the endemic alpine salamander, salamandra atra, has been studied using amplified fragment length polymorphism (aflp) from 11 populations throughout the range of the two currently recognized subspecies, atra and aurorae. five different primer combinations produced 706 bands and were analyzed by constructing a phylogenetic tree using nj and principal component analysis. significant genetic variation was revealed by aflp between and within populations but, ... | 2004 | 15120389 |
| phylogeography of the alpine salamander, salamandra atra (salamandridae) and the influence of the pleistocene climatic oscillations on population divergence. | fifty individuals of the endemic alpine salamander, salamandra atra, representing 13 populations throughout the range of the two currently recognized subspecies, atra and aurorae, were examined for sequence variation in a large portion (1050 bp) of the mitochondrial cytochrome b gene. we revealed a large number of mitochondrial dna (mtdna) haplotypes (10). interpopulation sequence divergence was very low, ranging from 0 to 3.1%. the relationships among haplotypes were poorly resolved. the diverg ... | 2001 | 11703653 |
| pigmentary system of the adult alpine salamander salamandra atra atra (laur., 1768). | the pigmentary system of the skin from adult specimens of the black alpine salamander salamandra atra atra was investigated by light microscope, electron microscope, and biochemical studies. results were compared with those obtained in previous study of the subspecies salamandra atra aurorae. unlike salamandra atra aurorae, which presents epidermal xanthophores and iridophores, salamandra atra atra is completely melanized, presenting only epidermal and dermal melanophores. the melanosomes in bot ... | 1991 | 1816547 |
| pigmentary system of the adult alpine salamander salamandra atra aurorae (trevisan, 1982). | the pigmentary system of skin from adult specimens of the amphibian urodele salamandra atra aurorae was investigated by light microscope, electron microscope, and biochemical studies. yellow (dorsum and head) and black (flank and belly) skin was tested. three chromatophore types are present in yellow skin: xanthophores, iridophores, and melanophores. xanthophores are located in the epidermis whereas iridophores and melanophores are found in the dermis. xanthophores contain types i, ii, and iii p ... | 2016 | 2385569 |
| [reproductive biology of the alpine salamander (salamandra atra laur)]. | | 1971 | 5119617 |
| [histology of the oviduct in mature salamandra atra, a completely viviparous urodele at high altitude]. | | 1967 | 4229119 |
| [preliminary research on cutaneous venom of salamandra atra]. | | 1965 | 5876883 |
| [on the development of the ovarian yellow bodies in salamandra atra laur. of the vaud alps]. | | 1964 | 14189760 |
| observations on the nucleic acids during the development of the lethal hybrid triton palmatus male chi salamandra atra female. | | 1954 | 13173462 |
| toxin variation among salamander populations: discussing potential causes and future directions. | amphibians produce defensive chemicals which provide protection against both predators and infections. within species, populations can differ considerably in the composition and amount of these chemical defenses. studying intraspecific variation in toxins and linking it to environmental variables may help us to identify the selective drivers of toxin evolution, such as predation pressure and infection risk. recently, there has been a renewed interest in the unique toxins produced by salamanders ... | 2020 | 32965720 |