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11 results for “Takydromus”
Data from: Influence of gene flow on divergence dating – implications for speciation history of Takydromus grass lizards
Dating the time of divergence and understanding speciation processes are central to the study of the evolutionary history of organisms but are notoriously difficult. The difficulty is largely rooted in variations in the ancestral population size or in the genealogy variation across loci. To depict the speciation processes and divergence histories of three monophyletic Takydromus species endemic to Taiwan, we sequenced 20 nuclear loci and combined with one mitochondrial locus published in GenBank. They were analyzed by a multispecies coalescent approach within a Bayesian framework. Divergence dating based on the gene tree approach showed high variation among loci, and the divergence was estimated at an earlier date than when derived by the species tree approach. To test whether variations in the ancestral population size accounted for the majority of this variation, we conducted computer inferences using isolation-with-migration (IM) and approximate Bayesian computation (ABC) frameworks. The results revealed that gene flow during the early stage of speciation was strongly favored over the isolation model, and the initiation of the speciation process was far earlier than the dates estimated by gene- and species-based divergence dating. Due to their limited dispersal ability, it is suggested that geographic isolation may have played a major role in the divergence of these Takydromus species. Nevertheless, the current study reveals a more complex situation and demonstrates that gene flow during the speciation process cannot be overlooked and may have a great impact on divergence dating. By using multilocus data and incorporating Bayesian coalescence approaches, we provide a more biologically realistic framework for delineating the divergence history of Takydromus.
FIGURE 4 in A new species of the genus Takydromus (Squamata: Lacertidae) from Tianjingshan Forestry Station, northern Guangdong, China
FIGURE 4. The general aspects (in life) of six species occurring on the Chinese mainland. A: Takydromus albomaculosus sp. nov., Am: adult male holotype SYS r001624; Af: adult female paratype SYS r001292; B: T. sexlineatus, Bm: adult male SYS r000127; By: subadult female SYS r001335; C: T. septentrionalis, upper: adult female; lower: adult male; D: T. sylvaticus, adult male topotype SYS001276; E: T. intermedius, Em: adult male topotype SYS r001601; Ef: adult female topotype SYS r001602; F: T. kuehnei, Fm: adult male specimen SYS r001268; Ff: adult female specimen SYS r001338.
FIGURE 3 in A new species of the genus Takydromus (Squamata: Lacertidae) from Tianjingshan Forestry Station, northern Guangdong, China
FIGURE 3. Showing the main morphological features of Takydromus albomaculosus sp. nov.: M: male holotype SYS r001624; F: female paratype SYS r001296. a: dorsal view of head and nape; b: ventral view of head and neck; c: lateral view of head and neck; d: showing ventral scales on posterior belly and hindlimbs, femoral pores, preanal scales and subcaudals; e: dorsal head and body.
FIGURE 1 in A new species of the genus Takydromus (Squamata: Lacertidae) from Tianjingshan Forestry Station, northern Guangdong, China
FIGURE 1. Map of southern and eastern China showing the collection locality (black round dot) of specimens of Takydromus albomaculosus sp. nov.: Tianjingshan Forestry Station, Ruyuan County, Guangdong Province, China.
FIGURE 2 in A new species of the genus Takydromus (Squamata: Lacertidae) from Tianjingshan Forestry Station, northern Guangdong, China
FIGURE 2. Maximum-likelihood phylogram of the genus Takydromus from partial DNA sequences of the mitochondrial COI gene. Number at the node is bootstrap support / posterior probability (BS/PP). "*" means BS is 100 or PP is 1.00, "-" means BS less than 70 or PP less than 0.90.
Data from: Influence of gene flow on divergence dating – implications for speciation history of Takydromus grass lizards
Open the record for dataset details and reuse information.
Figure 3 from: Wang J, Lyu Z-T, Yang C-Y, Li Y-L, Wang Y-Y (2019) A new species of the genus Takydromus (Squamata: Lacertidae) from southwestern Guangdong, China. ZooKeys 871: 119-139. https://doi.org/10.3897/zookeys.871.35947
Figure 3 Morphological features of the adult male holotype SYS r001580 of Takydromus yunkaiensis sp. nov. in life. A Habitus view and close-up of flank B close-up of dorsal body C close-up of ventral body D–G close-up of head scales.
Figure 2 from: Wang J, Lyu Z-T, Yang C-Y, Li Y-L, Wang Y-Y (2019) A new species of the genus Takydromus (Squamata: Lacertidae) from southwestern Guangdong, China. ZooKeys 871: 119-139. https://doi.org/10.3897/zookeys.871.35947
Figure 2 Bayesian Inference and Maximum Likelihood phylogenies. The Bayesian posterior probabilities (BPP) > 0.75 and the bootstrap supports for Maximum Likelihood analysis (BS) > 60 were retained.
Figure 4 from: Wang J, Lyu Z-T, Yang C-Y, Li Y-L, Wang Y-Y (2019) A new species of the genus Takydromus (Squamata: Lacertidae) from southwestern Guangdong, China. ZooKeys 871: 119-139. https://doi.org/10.3897/zookeys.871.35947
Figure 4 Sexual dimorphism in color patterns. A Male paratype of Takydromus yunkaiensis sp. nov. (SYS r001439) B female paratype of T. yunkaiensis sp. nov. (SYS r001901) C male topotype of T. intermedius (SYS r001601) from Mt. Emei, China D female topotype of T. intermedius (SYS r001602) from Mt. Emei, China E male T. kuehnei (SYS r001268) from Jiulianshan Nature Reserve, China F female topotype of T. kuehnei (SYS r001798) from Taiwan Island, China.
Figure 5 from: Wang J, Lyu Z-T, Yang C-Y, Li Y-L, Wang Y-Y (2019) A new species of the genus Takydromus (Squamata: Lacertidae) from southwestern Guangdong, China. ZooKeys 871: 119-139. https://doi.org/10.3897/zookeys.871.35947
Figure 5 Habitat of Takydromus yunkaiensis sp. nov. in Yunkaishan Nature Reserve.
Figure 1 from: Wang J, Lyu Z-T, Yang C-Y, Li Y-L, Wang Y-Y (2019) A new species of the genus Takydromus (Squamata: Lacertidae) from southwestern Guangdong, China. ZooKeys 871: 119-139. https://doi.org/10.3897/zookeys.871.35947
Figure 1 The type locality of Takydromus yunkaiensis sp. nov., Yunkaishan Nature Reserve.
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