| biosecurity interceptions of an invasive lizard: origin of stowaways and human-assisted spread within new zealand. | globalization, and the resultant movement of animals beyond their native range, creates challenges for biosecurity agencies. limited records of unintentional introductions inhibit our understanding of the trade pathways, transport vectors and mechanisms through which hitchhiker organisms are spread as stowaways. here, we adopt a phylogeographic approach to determine the source and human-mediated dispersal pathways of new zealand's only invasive lizard, the delicate skink (lampropholis delicata), ... | 2012 | 23467589 |
| experimental habitat fragmentation disrupts nematode infections in australian skinks. | habitat conversion and fragmentation threaten biodiversity and disrupt species interactions. while parasites are recognized as ecologically important, the impacts of fragmentation on parasitism are poorly understood relative to other species interactions. this lack of understanding is in part due to confounding landscape factors that accompany fragmentation. fragmentation experiments provide the opportunity to fill this knowledge gap by mechanistically testing how fragmentation affects parasitis ... | 2019 | 30488947 |
| a comparison of uterine contractile responsiveness to arginine vasopressin in oviparous and viviparous lizards. | nonapeptides and their receptors regulate a diverse range of physiological processes. we assessed the contractile responsiveness of uteri from the squamate viviparous-oviparous species pair, pseudemoia entrecasteauxii and lampropholis guichenoti, as well as the bimodally reproductive species, saiphos equalis, to arginine vasopressin (avp). we assessed the resulting uterine contractility as a function of pregnancy status, species and parity mode. we also measured mrna abundance for the nonapeptid ... | 2020 | 31858229 |
| emergence of an evolutionary innovation: gene expression differences associated with the transition between oviparity and viviparity. | our understanding of the evolution of complex biological traits is greatly advanced by examining taxa with intermediate phenotypes. the transition from oviparity (egg-laying) to viviparity (live-bearing) has occurred independently in many animal lineages, but there are few phenotypic intermediates. the lizard saiphos equalis exhibits bimodal reproduction, with some viviparous populations, and other oviparous populations with long egg-retention, a rare trait where most of embryonic development oc ... | 2020 | 32153075 |
| tyrosine phosphorylated proteins in the reproductive tract of the viviparous lizard eulamprus tympanum and the oviparous lizard lampropholis guichenoti. | plastic changes occur in the morphology of the uterus at various stages of the reproductive cycle in both oviparous and viviparous lizards and these may be influenced by estrogen. estrogen driven phosphorylation of effector proteins on tyrosine residues plays a major role in the plastic modulation of uterine anatomy and physiology in vertebrates. we used electrophoresis and western blotting to characterize the phosphotyrosine protein profiles at various stages of the reproductive pathway in an o ... | 2006 | 16750410 |
| how incubation temperature influences the physiology and growth of embryonic lizards. | eggs of two small australian lizards, lampropholis guichenoti and bassiana duperreyi, were incubated to hatching at 25 degrees c and 30 degrees c. incubation periods were significantly longer at 25 degrees c in both species, and temperature had a greater effect on the incubation period of b. duperreyi (41.0 days at 25 degrees c; 23.1 days at 30 degrees c) than l. guichenoti (40.1 days at 25 degrees c; 27.7 days at 30 degrees c). patterns of oxygen consumption were similar in both species at both ... | 2000 | 10935517 |
| hoxa10-like proteins in the reproductive tract of the viviparous lizard eulamprus tympanum and the oviparous lizard lampropholis guichenoti. | the gene hoxa10 and its protein product are essential for the formation of the extensions of the plasma membrane called uterodomes or pinopods in mammalian uterine epithelia. in mice, the presence of the hoxa10 protein and uterodomes is needed for uterine receptivity to blastocyst implantation. the viviparous lizard eulamprus tympanum displays uterodomes whereas the oviparous lizard lampropholis guichenoti does not. to explore the theory that hoxa10 is involved in the formation of uterodomes we ... | 2005 | 16040262 |
| utilisation of lipids, protein, ions and energy during embryonic development of australian oviparous skinks in the genus lampropholis. | the contents of eggs and neonates of the australian skinks, lampropholis guichenoti and l. delicata, are described and compared to allow interpretation of nutrient utilisation by the developing embryo. even though the females are the same size, l. guichenoti lay smaller clutches of larger eggs (egg contents=41.6+/-1.2 mg dry mass) than l. delicata (26.6+/-2.8 mg). the energy density is the same for eggs (30.5+/-0.9 j/g ash-free dry mass for l. guichenoti and 29.9+/-1.1 j/mg for l. delicata) and ... | 2001 | 11423304 |
| validation and use of22na turnover to measure food intake in free-ranging lizards. | as the food intake of free-ranging animals has proved to be difficult to measure by traditional means, the feasibility of using radioactive na to measure food consumption in a small scincid lizard (lampropholis guichenoti) was assessed. this technique has previously been used only for several species of mammal. a significant relationship between food intake and na turnover was found in the laboratory, with na turnover underestimating intake by 7.6%. the food intake of free-ranging members of a f ... | 1983 | 28310537 |
| changes in oviductal morphology of the skink, lampropholis guichenoti, associated with egg production. | we describe changes in the morphology of the oviductal epithelium of an oviparous skink, lampropholis guichenoti, during the course of egg production and oviposition: to characterize the luminal epithelial changes; to provide a baseline for understanding uterine changes in viviparous species; and to establish whether the plasma membrane transformation of uterine epithelial cells is indeed a feature restricted to viviparous species. oviducts from vitellogenic, gravid, and postgravid females were ... | 2004 | 15352207 |
| calcium atpase expression in the oviducts of the skink, lampropholis guichenoti. | lampropholis guichenoti is an oviparous lizard that lays eggs with a calcareous outer shell. we used immunofluorescence microscopy to describe the occurrence and distribution of ca2+ atpase pumps in the uterus of l. guichenoti at different stages of the reproductive and egg-shelling cycles. ca2+ atpase pumps were not demonstrated by immunofluorescent techniques in any uterine tissue until egg-shelling had commenced and at least partly calcified eggs were in the uterus. during egg-shelling, ca2+ ... | 2007 | 17462927 |
| the influence of hydric environments during egg incubation on embryonic heart rates and offspring phenotypes in a scincid lizard (lampropholis guichenoti). | extensive evidence shows that incubation conditions can affect phenotypic traits of hatchling reptiles, but the relative importance of thermal versus hydric factors, and the proximate mechanisms by which such factors influence hatchling phenotypes, remain unclear for most species. we incubated eggs of an australian scincid lizard, lampropholis guichenoti, at four different moisture contents ranging from -500 to 0 kpa. drier substrates reduced water uptake of eggs and resulted in smaller hatchlin ... | 2008 | 18593603 |
| immunolocalization of fgf1 and fgf2 in the regenerating tail of the lizard lampropholis guichenoti: implications for fgfs as trophic factors in lizard tail regeneration. | a role for fibroblast growth factors in stimulating limb and tail regeneration in amphibians has been shown; however, it is unknown whether these growth factors are also involved in the regeneration of the tail of lizard, an amniote model for studies on tissue regeneration. the presence of fibroblast growth factor-1 (fgf1) and -2 (fgf2) in the regenerating tail of the lizard lampropholis guichenoti has been studied using immunofluorescence labeling. the study reveals that fgf2 is mainly localize ... | 2010 | 19589562 |
| reptile pregnancy is underpinned by complex changes in uterine gene expression: a comparative analysis of the uterine transcriptome in viviparous and oviparous lizards. | the evolution of new organs is difficult to study because most vertebrate organs evolved only once, more than 500 million years ago. an ideal model for understanding complex organ evolution is the placenta, a structure that is present in live bearing reptiles and mammals (amniotes), which has evolved independently more than 115 times. using transcriptomics, we characterized the uterine gene expression patterns through the reproductive cycle of a viviparous skink lizard, pseudemoia entrecasteauxi ... | 2016 | 27635053 |
| epidermal differentiation in the developing scales of embryos of the australian scincid lizard lampropholis guichenoti. | formation of the first epidermal layers in the embryonic scales of the lizard lampropholis guichenoti was studied by optical and electron microscopy. morphogenesis of embryonic scales is similar to the general process in lizards, with well-developed overlapping scales being differentiated before hatching. the narrow outer peridermis is torn and partially lost during scale morphogenesis. a second layer, probably homologous to the inner peridermis of other lizard species, but specialized to produc ... | 1999 | 10420160 |
| effects of pregnancy on locomotor performance: an experimental study on lizards. | pregnancy is associated with reduced locomotor performance in many types of animals, but we do not know to what degree this correlation is caused by simple physical burdening, versus physiological changes associated with pregnancy, or to confounding variables (such as season or female body size) that simultaneously influence both reproductive investment and locomotor speeds. to identify causal effects of burden on locomotion, we need to experimentally manipulate the size of the load being carrie ... | 2003 | 12750993 |