The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
D U Weiguo - One of the best experts on this subject based on the ideXlab platform.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of egg shell. We experimentally generated external regional hypoxia by sealing either the upper half or bottom half of the surface area of eggs in 2 species of reptiles (snake [Lycodon rufozonatum] with parchment egg shell and Chinese soft-shelled turtle [Pelodiscus sinensis] with rigid egg shell), then monitored the growth pattern of the opaque white patch in turtle eggs (a membrane that attaches the embryo to the egg shell and plays an important role in gas exchange), the embryonic heart rate, the developmental rate and the hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased their heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced their growth of the opaque white patch. Furthermore, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these 2 species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment used less energy from yolk and, therefore, developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of eggshell. We experimentally generated external regional hypoxia by sealing either the upper- or bottom-half of the surface area of eggs in two species of reptiles [snake (Dinodon rufozonatum) with parchment eggshell and Chinese soft-shelled turtle (Pelodiscus sinensis) with rigid eggshell], then monitored growth pattern of the opaque white patch in turtle eggs, embryonic heart rate, developmental rate, and hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced the growth of the opaque white patch. Further, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these two species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment utilized less energy from yolk and therefore developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not. This article is protected by copyright. All rights reserved
Wenqi Tang - One of the best experts on this subject based on the ideXlab platform.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of egg shell. We experimentally generated external regional hypoxia by sealing either the upper half or bottom half of the surface area of eggs in 2 species of reptiles (snake [Lycodon rufozonatum] with parchment egg shell and Chinese soft-shelled turtle [Pelodiscus sinensis] with rigid egg shell), then monitored the growth pattern of the opaque white patch in turtle eggs (a membrane that attaches the embryo to the egg shell and plays an important role in gas exchange), the embryonic heart rate, the developmental rate and the hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased their heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced their growth of the opaque white patch. Furthermore, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these 2 species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment used less energy from yolk and, therefore, developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of eggshell. We experimentally generated external regional hypoxia by sealing either the upper- or bottom-half of the surface area of eggs in two species of reptiles [snake (Dinodon rufozonatum) with parchment eggshell and Chinese soft-shelled turtle (Pelodiscus sinensis) with rigid eggshell], then monitored growth pattern of the opaque white patch in turtle eggs, embryonic heart rate, developmental rate, and hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced the growth of the opaque white patch. Further, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these two species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment utilized less energy from yolk and therefore developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not. This article is protected by copyright. All rights reserved
Gernot Vogel - One of the best experts on this subject based on the ideXlab platform.
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contribution to the taxonomy of the genus Lycodon h boie in fitzinger 1827 reptilia squamata colubridae in china with description of two new species and resurrection and elevation of dinodon septentrionale chapaense angel bourret 1933
Zoological Research, 2021Co-Authors: Kai Wang, Gernot Vogel, Jing CheAbstract:While considerable progress has been made in the taxonomic studies of the genus Lycodon in Asia, questions remain to be clarified regarding the taxonomy of certain groups, particularly those containing species in China. Not only do many regions in China remain overlooked by herpetologists, resulting in the possibility of undiscovered new species, but the surveyed areas also have suspicious records of recognized congeners that require taxonomic confirmations. Combining both morphological and genetic data, we tackle these outstanding issues in the taxonomy of Lycodon in China. In particular, we discover two new species of Lycodon: one from the previously neglected hot-dry valley in the northern Hengduan Mountain Region close to Tibet, and another recluse and cryptic species from the L. fasciatus complex in the downtown park of a major city in southern Sichuan Province. Additionally, we clarify the distribution of L. septentrionalis in China and resurrect and elevate its junior synonym subspecies, Dinodon septentrionale chapaense, as a full, valid species, and we synonymize the recently described L. namdongensis to the resurrected L. chapaensis comb. nov .. Lycodon chapaensis comb. nov . thus represents a new national record of reptilian fauna of China. Lastly, based on literature review, we also correct some of the erroneous records of L. fasciatus and L. ruhstrati in China, point out remaining taxonomic issues of the genus for future research, and update the dichotomous key and distribution of the 20 species of Lycodon currently recorded from China.
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a new species of the Lycodon fasciatus complex from the khorat plateau eastern thailand reptiles squamata colubridae
Zootaxa, 2019Co-Authors: Gernot Vogel, Patrick DavidAbstract:A new species of the genus Lycodon Boie in Fitzinger is described on the basis of three specimens collected on the Khorat Plateau, Nakhon Ratchasima Province, Thailand. Lycodon gibsonae spec. nov. is superficially similar to L. fasciatus (Anderson), it differs by its much larger size, a higher number of ventral and subcaudal scales, and a lower number of bands on the body, the last three characters presenting no overlap with those of L. fasciatus sensu stricto. The new species seems to be endemic to the Khorat Plateau.
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multilocus phylogeny of Lycodon and the taxonomic revision of oligodon multizonatum
Asian Herpetological Research, 2014Co-Authors: Juan Lei, Gernot Vogel, Ke Jiang, Xiaoyu Sun, David T Booth, Li DingAbstract:Classification of the Asian snake genera Lycodon and Oligodon has proven challenging. We conducted a molecular phylogenetic analysis to estimate the phylogenetic relationships in the genus of Lycodon and clarify the taxonomic status of Oligodon multizonatum using mitochondrial (cyt b, ND4) and nuclear (c-mos) genes. Phylogenetic trees estimated using Maximum Likelihood and Bayesian Inference indicated that O. multizonatum is actually a species of Lycodon. Comparing morphological data from O. multizonatum and its closest relatives also supported this conclusion. Our results imply that a thorough review of the evolutionary relationships in the genus of Lycodon is strong suggested.
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revalidation of Lycodon hypsirhinoides theobald 1868 from andaman islands squamata serpentes colubridae
TAPROBANICA: The Journal of Asian Biodiversity, 2013Co-Authors: Gernot Vogel, S HarikrishnanAbstract:T he Andaman population of the genus Lycodon is compared to Lycodon capucinus Boie, 1827 and Lycodon aulicus (Linnaeus, 1758) occurring on the eastern and western parts of the range of this species complex. The population was found to be distinct and the species name Lycodon hypsirhinoides (Theobald, 1868) is revalidated for this population. It differs from both species in the size, proportions and colouration of adults and juveniles. DOI: http://dx.doi.org/10.4038/tapro.v5i1.5657 TAPROBANICA , April, 2013. Vol. 05, No. 01: pp. 19-31
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a new species of the genus Lycodon boie 1826 from laos squamata colubridae
2012Co-Authors: Gernot Vogel, T Q Nguyen, Phouthone Kingsada, Thomas ZieglerAbstract:A new species of the genus Lycodon is described from northern Laos. It differs from the superficially similar Lycodon ruhstrati by the colouration of the body and venter, the number of bands on body and tail; from the Lycodon fasciatus group by the number of the bands, the unbanded venter and the loreal not touching the eye. This new species is only known from the karst hills in Vientiane Province, Laos.
Bo Zhao - One of the best experts on this subject based on the ideXlab platform.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of egg shell. We experimentally generated external regional hypoxia by sealing either the upper half or bottom half of the surface area of eggs in 2 species of reptiles (snake [Lycodon rufozonatum] with parchment egg shell and Chinese soft-shelled turtle [Pelodiscus sinensis] with rigid egg shell), then monitored the growth pattern of the opaque white patch in turtle eggs (a membrane that attaches the embryo to the egg shell and plays an important role in gas exchange), the embryonic heart rate, the developmental rate and the hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased their heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced their growth of the opaque white patch. Furthermore, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these 2 species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment used less energy from yolk and, therefore, developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of eggshell. We experimentally generated external regional hypoxia by sealing either the upper- or bottom-half of the surface area of eggs in two species of reptiles [snake (Dinodon rufozonatum) with parchment eggshell and Chinese soft-shelled turtle (Pelodiscus sinensis) with rigid eggshell], then monitored growth pattern of the opaque white patch in turtle eggs, embryonic heart rate, developmental rate, and hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced the growth of the opaque white patch. Further, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these two species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment utilized less energy from yolk and therefore developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not. This article is protected by copyright. All rights reserved
Ye Chen - One of the best experts on this subject based on the ideXlab platform.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of egg shell. We experimentally generated external regional hypoxia by sealing either the upper half or bottom half of the surface area of eggs in 2 species of reptiles (snake [Lycodon rufozonatum] with parchment egg shell and Chinese soft-shelled turtle [Pelodiscus sinensis] with rigid egg shell), then monitored the growth pattern of the opaque white patch in turtle eggs (a membrane that attaches the embryo to the egg shell and plays an important role in gas exchange), the embryonic heart rate, the developmental rate and the hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased their heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced their growth of the opaque white patch. Furthermore, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these 2 species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment used less energy from yolk and, therefore, developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not.
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reduced egg shell permeability affects embryonic development and hatchling traits in Lycodon rufozonatum and pelodiscus sinensis
Integrative Zoology, 2018Co-Authors: Wenqi Tang, Bo Zhao, Ye Chen, D U WeiguoAbstract:The response of embryos to unpredictable hypoxia is critical for successful embryonic development, yet there remain significant gaps in our understanding of such responses in reptiles with different types of eggshell. We experimentally generated external regional hypoxia by sealing either the upper- or bottom-half of the surface area of eggs in two species of reptiles [snake (Dinodon rufozonatum) with parchment eggshell and Chinese soft-shelled turtle (Pelodiscus sinensis) with rigid eggshell], then monitored growth pattern of the opaque white patch in turtle eggs, embryonic heart rate, developmental rate, and hatchling traits in turtle and snake eggs in response to external regional hypoxia. The snake embryos from the hypoxia treatments facultatively increased heart rate during incubation, and turtle embryos from the upper-half hypoxia treatment enhanced the growth of the opaque white patch. Further, the incubation period and hatching success of embryos were not affected by the hypoxia treatment in these two species. External regional hypoxia significantly affected embryonic yolk utilization and offspring size in the snake and turtle. Compared to sham controls, embryos from the upper-half hypoxia treatment utilized less energy from yolk and therefore developed into smaller hatchlings, but embryos from the bottom-half hypoxia treatment did not. This article is protected by copyright. All rights reserved
