viviparous lizard
Response to gonadotropin releasing hormone challenge: Seasonal variation in steroid production in a viviparous lizard, Tiliqua nigrolutea
... The hypothalamic–pituitary–gonadal axis plays a central role in the regulation of gamete maturation, sex steroid production and the stimulation of reproductive behaviours in vertebrates. In seasonal breeders, the timely ...
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Placental nutrition in the viviparous lizard Niveoscincus metallicus: the influence of placental type
... the viviparous lizard Niveoscincus metallicus were measured to quantify uptake of nutrients across the ...to viviparous species that have been the focus of other ...
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Routes and mechanisms of embryonic hormone exposure and endocrine disruption in a viviparous lizard
... comparable among reptiles at the early stages of development, regardless of parity mode. The initiation of sex differentiation presumably occurs in N. metallicus at stages 30-32 (defined as ‘early’ in this study) as it ...
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Interpopulational variation in costs of reproduction related to pregnancy in a viviparous lizard
... In viviparous reptiles displaying a high degree of placentotrophy, in which embryos are nourished primar- ily by maternal nutrient transfer across the placenta (especially in annual breeders), impaired maternal ...
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Effects of luteectomy in early pregnancy on the maintenance of gestation and plasma progesterone concentrations in the viviparous temperate lizard Barisia imbricata imbricata
... Background: Several studies have shown that the corpus luteum is the principal source of progesterone during the gravidity period in reptiles; however, its participation in the maintenance of gestation in the ...
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Multiennial Reproduction in Females of a Viviparous, Temperate zone Skink, Tiliqua nigrolutea
... the viviparous lizard Liolaemus ...other viviparous squamate species, including the snakes Vipera berus (Prestt, 1971) and Vipera aspis (Naulleau and Fleury, 1990), and the lizards Anguis fragilis ...
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Evolution of viviparous reproduction in Paleozoic and Mesozoic reptiles
... semi-aquatic, viviparous lizard such as Yabeinosaurus could reflect an intermediate stage in the sort of transformation that lies in the deep history of fully aquatic forms such as plesiosaurs and ...its ...
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Parental effects in two species of viviparous lizards: Niveoscincus microlepidotus and N ocellatus
... Chapter 4: Atkins N, Swain R, Wapstra E, Jones SM. 2007b. Late stage deferral of parturition in the viviparous lizard Niveoscincus ocellatus (Gray 1845): implication for offspring quality and survival. ...
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Changes in Plasma Testosterone, Estrogen and Progesterone Concentrations Throughout the Annual Reproductive Cycle in Male Viviparous Blue tongued Skinks, Tiliqua nigrolutea, (Scincidae), in Tasmania
... Kreger and Mench (1993) considered the impact of handling and restraint on Tiliqua scincoides and found no significant chronic effect on plasma concentrations of the stress steroid hormone, corticosterone (B). ...
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Mating behaviour in the blotched blue tongued lizard, Tiliqua nigrolutea, in captivity
... Southern or blotched blue-tongued lizards, Tiliqua nigrolutea, are large, viviparous skinks distributed throughout southeastern Australia (Cogger, 1992). Adult males can range from 25–29 cm snout–vent length (SVL) ...
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Germ cell cluster formation and ovariole structure in viviparous and oviparous generations of the aphid Stomaphis quercus
... in viviparous and in oviparous generations measure about 6 µ m in ...In viviparous generations their diameter increases to about 10 µ m, while in oviparous generation to about 30 µ ...
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Placental transfer of H 3 oleic acid in three species of viviparous lizards: A route for supplementation of embryonic fat bodies?
... convey advantages that overcome the costs of producing and maintaining complex placentae. What, then, is the selective advantage of facultative placentotrophy? We have previously suggested that facultative placentotrophy ...
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Lizard tricks: overcoming conflicting requirements of speed versus climbing ability by altering biomechanics of the lizard stride
... Adaptations promoting greater performance in one habitat are thought to reduce performance in others. However, there are many examples of animals in which, despite habitat differences, such predicted differences in ...
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Changes in Plasma Progesterone, Estrogen, and Testosterone Concentrations throughout the Reproductive Cycle in Female Viviparous Blue Tongued Skinks, Tiliqua nigrolutea (Scincidae), in Tasmania
... Although only examined in females of a few, usually oviparous, reptile species, T appears to be an important secretory product of the ovary (Arslan et al., 1978; Callard et al., 1978; Owens, 1997; Staub and De Beer, ...
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Developmental expression of calcium transport proteins in extraembryonic membranes of oviparous and viviparous Zootoca vivipara (Lacertilia, Lacertidae)
... of viviparous females likewise is relatively low in calcium and the pattern of embryonic growth and calcium acquisition of viviparous embryos is similar to that of oviparous ...However, viviparous ...
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Angiogenesis of the uterus and chorioallantois in the eastern water skink Eulamprus quoyii
... We have discovered a modification of the uterus that appears to facilitate maternal-fetal communication during pregnancy in the scincid lizard Eulamprus quoyii . A vessel-dense elliptical area (VDE) on the ...
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Territoriality and Spatial Structure in the Green Anole, Anolis carolinensis
... territoriality, and spatial genetic structure in an urban populations of the green anole lizard,.. Anolis carolinensis.[r] ...
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Annual variation of litter size and offspring size in a viviparous skink
... Correcting for maternal SVL using residuals of the regression of SVL versus clutch size on the x-axis, and offspring size on the y-axis as recommended by Ford and Seigel, 1989 did not ch[r] ...
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Selection on space use in a polymorphic lizard
... We studied painted dragon lizards (Ctenophorus pictus) in a desert nature reserve (Yathong, NSW, 145 ⬚ 35 ⬘ E, 32 ⬚ 35 ⬘ S) every day during the mating season (August–January) when the weather permitted lizard ...
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Maternal effects on offspring fitness in pseudemoia entrecasteauxii : selective advantages and physiological mechanisms
... of viviparous reproduction, including matrotrophic reproduction in ...using viviparous animals with multiple origins, especially those with a large number of independent origins like reptiles and fish ...
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