Base de dados : MEDLINE
Pesquisa : G08.686.650 [Categoria DeCS]
Referências encontradas : 392 [refinar]
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[PMID]:29187161
[Au] Autor:Wu YQ; Qu YF; Wang XJ; Gao JF; Ji X
[Ad] Endereço:Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, Jiangsu, 210023, China.
[Ti] Título:Does the oviparity-viviparity transition alter the partitioning of yolk in embryonic snakes?
[So] Source:BMC Evol Biol;17(1):235, 2017 Nov 29.
[Is] ISSN:1471-2148
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The oviparity-viviparity transition is a major evolutionary event, likely altering the reproductive process of the organisms involved. Residual yolk, a portion of yolk remaining unutilized at hatching or birth as parental investment in care, has been investigated in many oviparous amniotes but remained largely unknown in viviparous species. Here, we used data from 20 (12 oviparous and 8 viviparous) species of snakes to see if the oviparity-viviparity transition alters the partitioning of yolk in embryonic snakes. We used ANCOVA to test whether offspring size, mass and components at hatching or birth differed between the sexes in each species. We used both ordinary least squares and phylogenetic generalized least squares regressions to test whether relationships between selected pairs of offspring components were significant. We used phylogenetic ANOVA to test whether offspring components differed between oviparous and viviparous species and, more specifically, the hypothesis that viviparous snakes invest more in the yolk as parental investment in embryogenesis to produce more well developed offspring that are larger in linear size. RESULTS: In none of the 20 species was sex a significant source of variation in any offspring component examined. Newborn viviparous snakes on average contained proportionally more water and, after accounting for body dry mass, had larger carcasses but smaller residual yolks than did newly hatched oviparous snakes. The rates at which carcass dry mass (CDM) and fat body dry mass (FDM) increased with residual yolk dry mass (YDM) did not differ between newborn oviparous and viviparous snakes. Neither CDM nor FDM differed between newborn oviparous and viviparous snakes after accounting for YDM. CONCLUSIONS: Our results are not consistent with the hypothesis that the partitioning of yolk between embryonic and post-embryonic stages differs between snakes that differ in parity mode, but instead show that the partitioning of yolk in embryonic snakes is species-specific or phylogenetically related. We conclude that the oviparity-viviparity transition does not alter yolk partitioning in embryonic snakes.
[Mh] Termos MeSH primário: Gema de Ovo/fisiologia
Embrião não Mamífero/fisiologia
Oviparidade/fisiologia
Serpentes/embriologia
Viviparidade não Mamífera/fisiologia
[Mh] Termos MeSH secundário: Animais
Animais Recém-Nascidos
Feminino
Filogenia
Análise de Regressão
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171201
[St] Status:MEDLINE
[do] DOI:10.1186/s12862-017-1083-z


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[PMID]:28445717
[Au] Autor:Ma Z; Li H; Zheng H; Jiang K; Yan F; Tian Y; Kang X; Wang Y; Liu X
[Ad] Endereço:College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, PR China.
[Ti] Título:Hepatic ELOVL6 mRNA is regulated by the gga-miR-22-3p in egg-laying hen.
[So] Source:Gene;623:72-79, 2017 Aug 05.
[Is] ISSN:1879-0038
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The elongation of very long chain fatty acids protein 6 (ELOVL6) encodes a fatty acid elongase that is responsible for the final step in endogenous saturated fatty acid synthesis and involves in de novo lipogenesis. Though the regulatory mechanism of ELOVL6 expression has been studied extensively, little is known about the role of miRNA in regulating ELOVL6 gene expression in chicken until now. To investigate the regulatory mechanism of miRNA on the expression of ELOVL6 gene, bioinformatics analysis was employed to predict the potential miRNAs that binding with the 3'untranslated region (3'UTR) of ELOVL6. The putative miRNA was further screened by comparative analysis with previous miRNA-seq results. Gga-miR-22-3p, which could bind with the 3'UTR of ELOVL6 and showed negative expression correlation with ELOVL6 gene in chicken liver, was obtained. Tissue expression profiles showed that gga-miR-22-3p and ELOVL6 are extensively expressed in many tissues, and ELOVL6 with high expression level in kidney and liver tissues, and gga-miR-22-3p with high expression in lung and heart. Dual-luciferase reporter assays results indicated that the expression of luciferase reporter gene linked with part sequence of the 3'UTR of chicken ELOVL6 gene was down-regulated by the overexpression of gga-miR-22-3p in the DF1 cells, and the down-regulation behavior was abolished when the gga-miR-22-3p binding site in 3'UTR of ELOVL6 was mutated (P>0.05). Furthermore, the ELOVL6 expression in chicken hepatocytes was down-regulated when miR-22-3p was over-expressed. Therefore, we concluded that miR-22-3p might involve in controlling the hepatic lipid composition through affecting the expression of ELOVL6 gene, and could serve as a regulator of lipid metabolism in the liver of egg-laying hen.
[Mh] Termos MeSH primário: Acetiltransferases/genética
Galinhas/genética
Fígado/metabolismo
MicroRNAs/genética
[Mh] Termos MeSH secundário: Regiões 3' não Traduzidas
Acetiltransferases/metabolismo
Animais
Galinhas/fisiologia
Feminino
Rim/metabolismo
Lipólise/genética
Pulmão/metabolismo
Miocárdio/metabolismo
Oviparidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (3' Untranslated Regions); 0 (MicroRNAs); EC 2.3.1.- (Acetyltransferases); EC 2.3.1.- (fatty acid elongases)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170615
[Lr] Data última revisão:
170615
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170427
[St] Status:MEDLINE


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[PMID]:28343577
[Au] Autor:Dayananda B; Ibargüengoytía N; Whiting MJ; Webb JK
[Ad] Endereço:School of Life Sciences, University of Technology Sydney, Broadway 2007, NSW, Australia. Electronic address: buddhi6@gmail.com.
[Ti] Título:Effects of pregnancy on body temperature and locomotor performance of velvet geckos.
[So] Source:J Therm Biol;65:64-68, 2017 Apr.
[Is] ISSN:0306-4565
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Pregnancy is a challenging period for egg laying squamates. Carrying eggs can encumber females and decrease their locomotor performance, potentially increasing their risk of predation. Pregnant females can potentially reduce this handicap by selecting higher temperatures to increase their sprint speed and ability to escape from predators, or to speed up embryonic development and reduce the period during which they are burdened with eggs ('selfish mother' hypothesis). Alternatively, females might select more stable body temperatures during pregnancy to enhance offspring fitness ('maternal manipulation hypothesis'), even if the maintenance of such temperatures compromises a female's locomotor performance. We investigated whether pregnancy affects the preferred body temperatures and locomotor performance of female velvet geckos Amalosia lesueurii. We measured running speed of females during late pregnancy, and one week after they laid eggs at four temperatures (20°, 25°, 30° and 35°C). Preferred body temperatures of females were measured in a cost-free thermal gradient during late pregnancy and one week after egg-laying. Females selected higher and more stable set-point temperatures when they were pregnant (mean =29.0°C, T =27.8-30.5°C) than when they were non-pregnant (mean =26.2°C, T =23.7-28.7°C). Pregnancy was also associated with impaired performance; females sprinted more slowly at all four test temperatures when burdened with eggs. Although females selected higher body temperatures during late pregnancy, this increase in temperature did not compensate for their impaired running performance. Hence, our results suggest that females select higher temperatures during pregnancy to speed up embryogenesis and reduce the period during which they have reduced performance. This strategy may decrease a female's probability of encountering predatory snakes that use the same microhabitats for thermoregulation. Selection of stable temperatures by pregnant females may also benefit embryos, but manipulative experiments are necessary to test this hypothesis.
[Mh] Termos MeSH primário: Lagartos/fisiologia
[Mh] Termos MeSH secundário: Animais
Temperatura Corporal
Regulação da Temperatura Corporal
Feminino
Lagartos/embriologia
Locomoção
Oviparidade
Reprodução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170510
[Lr] Data última revisão:
170510
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170328
[St] Status:MEDLINE


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[PMID]:28062221
[Au] Autor:Poisbleau M; Beaulieu M; Dehnhard N; Demongin L; Lepoint G; Sturaro N; Eens M
[Ad] Endereço:Behavioural Ecology & Ecophysiology Group, Department of Biology, University of Antwerp, Campus Drie Eiken, Universiteitsplein 1, 2610 Antwerp (Wilrijk), Belgium. Electronic address: maud.poisbleau@gmail.com.
[Ti] Título:Extreme intra-clutch egg size dimorphism is not coupled with corresponding differences in antioxidant capacity and stable isotopes between eggs.
[So] Source:Comp Biochem Physiol A Mol Integr Physiol;205:77-85, 2017 Mar.
[Is] ISSN:1531-4332
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Oviparous females need to allocate resources optimally to their eggs in order to maximize their fitness. Among these resources, dietary antioxidants, acquired by females and transferred to the eggs during egg formation, can greatly affect the development and survival of the embryo and chick. In crested penguins, incubation starts after the second and last egg is laid and, as opposed to many other bird species, this egg hatches first, thereby enhancing the survival of the chick. Here, we assessed whether antioxidant and isotopic composition could underlie these differences between eggs within clutches of southern rockhopper penguins (Eudyptes chrysocome chrysocome). The second-laid egg had higher total antioxidant capacity than the first-laid egg, although this was not due to higher antioxidant concentration but to its higher mass. This suggests that resources are allocated by females at a constant rate in both eggs within clutches. Accordingly, we found a strong correlation for isotopic compositions between eggs suggesting that resources were allocated similarly to each egg within the clutch. Overall, we found little evidence for a significant role of antioxidant and isotopic compositions to explain differences in terms of embryo/chick development between eggs in crested penguins. However, since our results suggest a constant rate of antioxidant transfer from females to eggs, limiting the mass of the first-laid egg might represent a strategy for females to spare antioxidant defences and preserve self-maintenance.
[Mh] Termos MeSH primário: Antioxidantes/metabolismo
Óvulo/citologia
Óvulo/metabolismo
Spheniscidae/fisiologia
[Mh] Termos MeSH secundário: Animais
Peso Corporal
Isótopos de Carbono
Tamanho Celular
Tamanho da Ninhada/fisiologia
Feminino
Isótopos de Nitrogênio
Oviparidade/fisiologia
Oviposição/fisiologia
Spheniscidae/embriologia
Spheniscidae/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antioxidants); 0 (Carbon Isotopes); 0 (Nitrogen Isotopes)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170717
[Lr] Data última revisão:
170717
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170108
[St] Status:MEDLINE


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[PMID]:27578877
[Au] Autor:Herrera J; Saldaña B; Guzmán P; Cámara L; Mateos GG
[Ad] Endereço:Camar Agroalimentaria, S.L., 45214 Toledo, Spain.
[Ti] Título:Influence of particle size of the main cereal of the diet on egg production, gastrointestinal tract traits, and body measurements of brown laying hens1.
[So] Source:Poult Sci;96(2):440-448, 2017 Feb 01.
[Is] ISSN:1525-3171
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The influence of the screen size used to grind the main cereal of the diet on egg production, gastrointestinal tract (GIT) development, and body measurements was studied in hens from 17 to 49 wk of age. Diets formed a 2 × 5 factorial with 2 main cereals (corn vs. barley) and 5 screen sizes of the cereal (4, 6, 8, 10, and 12 mm). Each treatment was replicated 5 times. No interactions between main cereal and screen size were observed for any of the traits studied. Cereal type and screen size did not affect feed intake, egg production, BW gain, or quality traits of the eggs. Eggs tended to be larger (P = 0.092) in hens fed the barley diet than in hens fed the corn diet. Also, feed conversion ratio tended to increase (P = 0.081) when the cereal of the diet was ground with a 4-mm screen as compared with the average of the other diets. At 49 wk of age, the relative weight (% BW) of the GIT and gizzard was greater (P < 0.05) in hens fed barley than in hens fed corn. An increase in the screen size increased linearly the relative weight of the GIT (P = 0.089), gizzard (P < 0.01), and liver (P = 0.056). None of the other GIT traits or body measurements was affected by the main cereal or the screen size. In summary, barley can substitute up to 45% of the corn in diets for laying hens without any adverse effect on egg production. Therefore, the use of one or other cereal will depend on their relative cost. An increase in screen size improved gizzard development but had little effect on hen productivity. Within the range studied, the size of the screen used for grinding the cereal had little effect on hen productivity, although the use of a 4-mm screen might increase feed conversion ratio and gizzard development.
[Mh] Termos MeSH primário: Galinhas/fisiologia
Dieta/veterinária
Grãos Comestíveis/química
Comportamento Alimentar
Trato Gastrointestinal/crescimento & desenvolvimento
Oviparidade/efeitos dos fármacos
Reprodução/efeitos dos fármacos
[Mh] Termos MeSH secundário: Ração Animal/análise
Animais
Galinhas/crescimento & desenvolvimento
Feminino
Trato Gastrointestinal/efeitos dos fármacos
Tamanho da Partícula
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170524
[Lr] Data última revisão:
170524
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160901
[St] Status:MEDLINE
[do] DOI:10.3382/ps/pew256


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[PMID]:27102939
[Au] Autor:Griffith OW; Brandley MC; Whittington CM; Belov K; Thompson MB
[Ad] Endereço:School of Life and Environmental Sciences, Heydon-Laurence Building, University of Sydney, Sydney, NSW 2006, Australia; Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, United States. Electronic address: oliver.griffith@yale.edu.
[Ti] Título:Comparative genomics of hormonal signaling in the chorioallantoic membrane of oviparous and viviparous amniotes.
[So] Source:Gen Comp Endocrinol;244:19-29, 2017 Apr 01.
[Is] ISSN:1095-6840
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In oviparous amniotes (reptiles, birds, and mammals) the chorioallantoic membrane (CAM) lines the inside of the egg and acts as the living point of contact between the embryo and the outside world. In livebearing (viviparous) amniotes, communication during embryonic development occurs across placental tissues, which form between the uterine tissue of the mother and the CAM of the embryo. In both oviparous and viviparous taxa, the CAM is at the interface of the embryo and the external environment and can transfer signals from there to the embryo proper. To understand the evolution of placental hormone production in amniotes, we examined the expression of genes involved in hormone synthesis, metabolism, and hormone receptivity in the CAM of species across the amniote phylogeny. We collected transcriptome data for the chorioallantoic membranes of the chicken (oviparous), the lizards Lerista bougainvillii (both oviparous and viviparous populations) and Pseudemoia entrecasteauxii (viviparous), and the horse Equus caballus (viviparous). The viviparous taxa differ in their mechanisms of nutrient provisioning: L. bougainvillii is lecithotrophic (embryonic nourishment is provided via the yolk only), but P. entrecasteauxii and the horse are placentotrophic (embryos are nourished via placental transport). Of the 423 hormone-related genes that we examined, 91 genes are expressed in all studied species, suggesting that the chorioallantoic membrane ancestrally had an endocrine function. Therefore, the chorioallantoic membrane appears to be a highly hormonally active organ in all amniotes. No genes are expressed only in viviparous species, suggesting that the evolution of viviparity has not required the recruitment of any specific hormone-related genes. Our data suggest that the endocrine function of the CAM as a placental tissue evolved in part through co-option of ancestral gene expression patterns.
[Mh] Termos MeSH primário: Membrana Corioalantoide/metabolismo
Oviparidade/fisiologia
[Mh] Termos MeSH secundário: Animais
Galinhas
Feminino
Genômica
Cavalos
Lagartos
Mamíferos
Gravidez
Transdução de Sinais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170726
[Lr] Data última revisão:
170726
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160423
[St] Status:MEDLINE


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[PMID]:27903777
[Au] Autor:Zúñiga-Vega JJ; Fuentes-G JA; Ossip-Drahos AG; Martins EP
[Ad] Endereço:Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad de México 04510, México jzuniga@ciencias.unam.mx.
[Ti] Título:Repeated evolution of viviparity in phrynosomatid lizards constrained interspecific diversification in some life-history traits.
[So] Source:Biol Lett;12(11), 2016 Nov.
[Is] ISSN:1744-957X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In vertebrates, viviparity has evolved independently multiple times, apparently increasing morphological diversification and speciation rates as a consequence. We tested whether the evolution of viviparity has also increased diversification of life-history traits by estimating evolutionary rates of lizards from the North American family Phrynosomatidae. Using modern phylogenetic comparative methods, we compared these rates between oviparous and viviparous species, and found no support for this hypothesis. Instead, we found higher evolutionary rates for oviparous species in some life-history traits. Our results suggest that the evolution of viviparity may have constrained rather than facilitated evolution of life histories.
[Mh] Termos MeSH primário: Evolução Biológica
Traços de História de Vida
Lagartos/classificação
Viviparidade não Mamífera
[Mh] Termos MeSH secundário: Animais
Feminino
Oviparidade
Filogenia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171101
[Lr] Data última revisão:
171101
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161202
[St] Status:MEDLINE


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[PMID]:27814527
[Au] Autor:Qiao Q; Le Manach S; Huet H; Duvernois-Berthet E; Chaouch S; Duval C; Sotton B; Ponger L; Marie A; Mathéron L; Lennon S; Bolbach G; Djediat C; Bernard C; Edery M; Marie B
[Ad] Endereço:UMR 7245 MNHN/CNRS Molécules de Communication et Adaptation des Micro-organismes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CP 39, 12 Rue Buffon, 75005 Paris, France. Electronic address: qqin@mnhn.fr.
[Ti] Título:An integrated omic analysis of hepatic alteration in medaka fish chronically exposed to cyanotoxins with possible mechanisms of reproductive toxicity.
[So] Source:Environ Pollut;219:119-131, 2016 Dec.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Cyanobacterial blooms threaten human health as well as the population of other living organisms in the aquatic environment, particularly due to the production of natural toxic components, the cyanotoxin. So far, the most studied cyanotoxins are microcystins (MCs). In this study, the hepatic alterations at histological, proteome and transcriptome levels were evaluated in female and male medaka fish chronically exposed to 1 and 5 µg L microcystin-LR (MC-LR) and to the extract of MC-producing Microcystis aeruginosa PCC 7820 (5 µg L of equivalent MC-LR) by balneation for 28 days, aiming at enhancing our understanding of the potential reproductive toxicity of cyanotoxins in aquatic vertebrate models. Indeed, both MC and Microcystis extract adversely affect reproductive parameters including fecundity and egg hatchability. The liver of toxin treated female fish present glycogen storage loss and cellular damages. The quantitative proteomics analysis revealed that the quantities of 225 hepatic proteins are dysregulated. In particular, a notable decrease in protein quantities of vitellogenin and choriogenin was observed, which could explain the decrease in reproductive output. Liver transcriptome analysis through Illumina RNA-seq reveals that over 100-400 genes are differentially expressed under 5 µg L MC-LR and Microcystis extract treatments, respectively. Ingenuity pathway analysis of the omic data attests that various metabolic pathways, such as energy production, protein biosynthesis and lipid metabolism, are disturbed by both MC-LR and the Microcystis extract, which could provoke the observed reproductive impairment. The transcriptomics analysis also constitutes the first report of the impairment of circadian rhythm-related gene induced by MCs. This study contributes to a better understanding of the potential consequences of chronic exposure of fish to environmental concentrations of cyanotoxins, suggesting that Microcystis extract could impact a wider range of biological pathways, compared with pure MC-LR, and even 1 µg L MC-LR potentially induces a health risk for aquatic organisms.
[Mh] Termos MeSH primário: Toxinas Bacterianas/toxicidade
Doença Hepática Induzida por Substâncias e Drogas
Doenças dos Peixes/induzido quimicamente
Fígado/efeitos dos fármacos
Microcistinas/toxicidade
Microcystis/química
Oryzias/fisiologia
Reprodução/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Toxinas Bacterianas/administração & dosagem
Extratos Celulares/administração & dosagem
Extratos Celulares/farmacologia
Ritmo Circadiano/efeitos dos fármacos
Ritmo Circadiano/genética
Ritmo Circadiano/fisiologia
Regulação para Baixo/efeitos dos fármacos
Feminino
Glicogênio/metabolismo
Metabolismo dos Lipídeos/efeitos dos fármacos
Fígado/metabolismo
Fígado/patologia
Masculino
Microcistinas/administração & dosagem
Oviparidade/efeitos dos fármacos
Oviparidade/genética
Biossíntese de Proteínas/efeitos dos fármacos
Proteoma/efeitos dos fármacos
Proteoma/metabolismo
Transcriptoma/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bacterial Toxins); 0 (Cell Extracts); 0 (Microcystins); 0 (Proteome); 77238-39-2 (microcystin); 9005-79-2 (Glycogen)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170921
[Lr] Data última revisão:
170921
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161105
[St] Status:MEDLINE


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[PMID]:27712651
[Au] Autor:Landry Yuan F; Pickett EJ; Bonebrake TC
[Ad] Endereço:School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, China.
[Ti] Título:Cooler performance breadth in a viviparous skink relative to its oviparous congener.
[So] Source:J Therm Biol;61:106-114, 2016 Oct.
[Is] ISSN:0306-4565
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Susceptibility of species to climate change varies depending on many biological and environmental traits, such as reproductive mode and climatic exposure. For example, wider thermal tolerance breadths are associated with more climatically variable habitats and viviparity could be associated with greater vulnerability relative to oviparity. However, few examples exist detailing how such physiological and environmental traits together might shape species thermal performance. In this study we compared the thermal tolerance and performance of two sympatric skink congeners in Hong Kong that differ in habitat use and reproductive mode. The viviparous Sphenomorphus indicus lives on the forest floor while the oviparous Sphenomorphus incognitus occupies stream edges. We quantified the thermal environments in each of these habitats to compare climatic exposure and then calculated thermal safety margins, potential daily activity times within each species' thermal optimal range, and possible climate change vulnerability. Although we did not detect any differences in thermal tolerance range or thermal environments across habitats, we found cooler performance in S. indicus relative to S. incognitus. Moreover, while optimal activity time increases for both skinks under a warming scenario, we project that the thermal safety margin of S. indicus would narrow to nearly zero, thus losing its buffering capacity to potential extreme climate events in the future. This research is thus consistent with recent studies emphasizing the vulnerability of viviparous reptiles to a warming climate. The results together furthermore highlight the complexity in how environmental and physiological traits at multiple spatial scales structure climate change vulnerability of ectothermic species.
[Mh] Termos MeSH primário: Aclimatação
Mudança Climática
Lagartos/fisiologia
Oviparidade
Viviparidade não Mamífera
[Mh] Termos MeSH secundário: Animais
Temperatura Corporal
Temperatura Baixa
Ecossistema
Feminino
Reprodução
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170316
[Lr] Data última revisão:
170316
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161008
[St] Status:MEDLINE


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[PMID]:27635053
[Au] Autor:Griffith OW; Brandley MC; Belov K; Thompson MB
[Ad] Endereço:School of Life and Environmental Science, University of Sydney, Camperdown, NSW, Australia oliver.griffith@yale.edu.
[Ti] Título:Reptile Pregnancy Is Underpinned by Complex Changes in Uterine Gene Expression: A Comparative Analysis of the Uterine Transcriptome in Viviparous and Oviparous Lizards.
[So] Source:Genome Biol Evol;8(10):3226-3239, 2016 Oct 30.
[Is] ISSN:1759-6653
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo: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 entrecasteauxii Then we compare these patterns with the patterns of gene expression from two oviparous skinks Lampropholis guichenoti and Lerista bougainvillii While thousands of genes are differentially expressed between pregnant and non-pregnant uterine tissue in the viviparous skink, few differentially expressed genes were identified between gravid and non-gravid oviparous skinks. This finding suggests that in P. entrecasteauxii, a pregnant-specific gene expression profile has evolved, allowing for the evolution of pregnancy-specific innovations in the uterus. We find substantial gene expression differences between the uterus of the chorioallantoic and the yolk sac placenta in P. entrecasteauxii, suggesting these placental regions are specialized for different placental functions. In particular, the chorioallantoic placenta is likely a major site of nutrient transport by membrane-bound transport proteins, while the yolk sac placenta also likely transports nutrients but via apocrine secretions. We discuss how the evolution of transcription factor networks is likely to underpin the evolution of the new transcriptional states in the uterine tissue of viviparous reptiles.
[Mh] Termos MeSH primário: Lagartos/genética
Oviparidade/genética
Transcriptoma
Útero/metabolismo
Viviparidade não Mamífera/genética
[Mh] Termos MeSH secundário: Animais
Evolução Molecular
Feminino
Lagartos/fisiologia
Saco Vitelino/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170810
[Lr] Data última revisão:
170810
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160917
[St] Status:MEDLINE



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