Survey of the oviduct of salamandrids with special reference to the viviparous species

Greven, Hartmut

doi:10.1002/(sici)1097-010x(199811/12)282:4/5<507::aid-jez7>3.0.co;2-0

Cited by 51 publications

(43 citation statements)

References 31 publications

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“…The acceleration of embryonic development occurs during the non-feeding lecithotrophic stages of development (S. s. bernardezi; Buckley et al, 2007), and is also facilitated by cannibalistic feeding in the post-hatching stage via oophagy, ingestion of eggs, and adelphophagy, and ingestion of larvae; (Dopazo and Alberch, 1994;Wourms, 1981;Greven, 1998). Thus, viviparity in our island populations could be determined not only through physiological and/or genetic mechanisms but also through oviductal retention of the larvae, allowing the embryos and hatchlings to grow faster and metamorphose before birth.…”

Section: Genetic Isolation Vs Environmental Factors For Viviparity Inmentioning

confidence: 99%

Genetic drift and rapid evolution of viviparity in insular fire salamanders (Salamandra salamandra)

2011

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Continental islands offer an excellent opportunity to investigate adaptive processes and to time microevolutionary changes that precede macroevolutionary events. We performed a population genetic study of the fire salamander (Salamandra salamandra), a species that displays unique intraspecific diversity of reproductive strategies, to address the microevolutionary processes leading to phenotypic and genetic differentiation of island, coastal and interior populations. We used eight microsatellite markers to estimate genetic diversity, population structure and demographic parameters in viviparous insular populations and ovoviviparous coastal and interior populations. Our results show considerable genetic differentiation (F ST range: 0.06-0.27), and no clear signs of gene flow among populations, except between the large and admixed interior populations. We find no support for island colonization by rafting or intentional/accidental anthropogenic introductions, indicating that rising sea levels were responsible for isolation of the island populations approximately 9000 years ago. Our study provides evidence of rapid genetic differentiation between island and coastal populations, and rapid evolution of viviparity driven by climatic selective pressures on island populations, geographic isolation with genetic drift, or a combination of these factors. Studies of these viviparous island populations in early stages of divergence help us better understand the microevolutionary processes involved in rapid phenotypic shifts.

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Section: Genetic Isolation Vs Environmental Factors For Viviparity Inmentioning

confidence: 99%

Genetic drift and rapid evolution of viviparity in insular fire salamanders (Salamandra salamandra)

2011

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“…In amphibians whose fertilization occurs in water, the initiation of motility is induced by the decrease of osmolality around sperm (Inoda and Morisawa, 1987). On the other hand, in most urodeles, fertilization is achieved in the cloaca of female (Tsutsui, 1931;Greven, 1998). Sperm are quiescently stored in spermatheca for a long duration and directly inseminated onto an egg at fertilization.…”

Section: Discussionmentioning

confidence: 99%

“…Components of each sublayer of the egg-jelly are fundamentally secreted in the specific region of oviduct (Okimura et al, 1999;Greven, 2002) and those of the outermost sublayer are secreted in uterus. It is reported that the secretion from the uterus changed to fit with the mode of viviparous mode in European salamanders (Greven, 1998). It is needed to investigate the secretion in uterus in order to clarify the uniqueness of the SMIS in amphibian fertilization.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Sperm Motility Induced on the Egg-Jelly in the Internal Fertilization of the Newt, Cynops pyrrhogaster

et al. 2003

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“…Salamandra salamandra belongs to ovoviviparous (larviparity) and viviparous (fully metamorposed individuals are born) urodeles and is a model species widely used in developmental biology research (Greven 1998, Thiesmeier 2004, Buckley et al 2007, Zakrzewski 2007). Development of embryos takes place in the oviducts and in their final, enlarged and well-vascularized part -the uterus (Francis 1934, Greven and Guex 1994, Zakrzewski 2007.…”

Section: Gelatinous Egg Envelope 5 MMmentioning

confidence: 99%

Ultrasonography: a method used for pregnancy imaging of the fire salamander (Salamandra salamandra)

Najbar¹,

Kiełbowicz²,

Szymczak³

et al. 2016

Polish Journal of Veterinary Sciences

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Ultrasound imaging has more frequently been used in veterinary medicine of amphibians and reptiles. In this study, we have verified the usefulness of ultrasound imaging in pregnancy determination of the fire salamander Salamandra salamandra. We have also undertaken to estimate the number of larvae and their developmental stage directly in the oviducts. Three gravid females from Lower Silesia (southern Poland) were examined. Due to the small size of the scanned animals, and the particular arrangement of embryos in the oviducts and ultrasound beams dispersal, the method proved to be inaccurate. Therefore, the minimum number of well-visualized larvae was determined. The maximum number of larvae was established on the basis of the visible fragments of embryos. After birth, we found that the number of larvae born was included in the "min-max"range in only one case. In the remaining two salamanders the number of larvae was higher than estimated in 3 to 7 individuals. The results showed that ultrasound imaging allows the minimum number of larvae in salamander; oviducts to be specified. However, total length measurements were possible only for single and clearly visible embryos.

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Survey of the oviduct of salamandrids with special reference to the viviparous species

Cited by 51 publications

References 31 publications

Genetic drift and rapid evolution of viviparity in insular fire salamanders (Salamandra salamandra)

Genetic drift and rapid evolution of viviparity in insular fire salamanders (Salamandra salamandra)

Characteristics of Sperm Motility Induced on the Egg-Jelly in the Internal Fertilization of the Newt, Cynops pyrrhogaster

Ultrasonography: a method used for pregnancy imaging of the fire salamander (Salamandra salamandra)

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