Patterns of niche diversification in south-east Asian crocodile newts

Hernandez, Axel; Escoriza, Daniel; Hou, Mian

doi:10.1016/j.jcz.2018.06.001

Cited by 14 publications

(16 citation statements)

References 54 publications

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“…Since the Da River is the largest river in northwestern Vietnam, it may serve as a physical barrier restricting the gene flow between populations. Recently, Hernandez et al (2018) assessed the patterns of macro-ecological niche differentiation in Asian crocodile newts. The authors suggested that both niche conservatism as well as niche differentiation can be detected.…”

Section: Discussionmentioning

confidence: 99%

Integrative taxonomy reveals three new taxa within the Tylototriton asperrimus complex (Caudata, Salamandridae) from Vietnam

Bernardes

Lê

Nguyen

et al. 2020

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The Tylototriton asperrimus complex from northern Vietnam is reviewed based on morphological comparisons and analysis of the mitochondrial marker NADH dehydrogenase subunit 2 (ND2). Based on molecular divergences, which were revealed to be higher than in other congeners, in concert with morphological differences, two new species and one subspecies are described herein: Tylototriton pasmansisp. nov. differs from T. asperrimussensu stricto by 3.2 to 3.6 % genetic divergence and a combination of distinct morphological characters, such as head slightly longer than wide, distinct mid-dorsal ridge, relatively wide distance between the eyes, tips of fingers reaching the eye when foreleg is laid forward, labial and gular folds present, central belly skin with tubercles shaped like transverse wrinkles and distinct, pointy to round rib nodules. The population of T. pasmansisp. nov. consists of two subclades, the nominotypic one occurring on the eastern side of the Da River (or Black River, including Hoa Binh and Phu Tho provinces), and another occurring on the western side (including Son La and Thanh Hoa provinces). These two subclades differ by 2.5 to 3.1 % genetic divergence and distinct morphological characters. The western subclade is herein described as Tylototriton pasmansi obstissp. nov., which differs from the nominotypic form by a wider head, longer and narrower snout, shorter femur length, and an overall less granulose skin, without an increased concentration of warts on the body sides. A second new species, Tylototriton sparreboomisp. nov. is described from Lai Chau Province. It differs from T. asperrimussensu stricto by 4.1 to 4.2 % and from Tylototriton pasmansisp. nov. by 3.6 to 4.5 % genetic divergences as well as by a combination of distinct morphological characters, such as head longer than wide, tips of fingers reaching nostril when foreleg adpressed along head, rib nodules distinct, round and relatively enlarged, and wide distance between the eyes.

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Section: Discussionmentioning

confidence: 99%

Integrative taxonomy reveals three new taxa within the Tylototriton asperrimus complex (Caudata, Salamandridae) from Vietnam

Bernardes

Lê

Nguyen

et al. 2020

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“…This fact can be explained from a biogeographic viewpoint: the Kachin Hills represent the southernmost outcrop of the Great Himalaya ridge (Hadden, 2008) and are isolated from the Shan Plateau by the Irrawaddy (Ayeyarwaddy) River valley, which may serve as an important biogeographic border for forest-dwelling taxa. Tylototritonhimalayanus , which can be found in Nepal and possibly along the Great Himalaya Ridge, was previously reported for northern Myanmar (Hernandez, 2016, 2018), but without any information on voucher specimens or reasons for such identification. There is a possibility that these records are based on the misidentification of Tylototriton kachinorum sp.…”

Section: Discussionmentioning

confidence: 96%

“…1, distinct from T. verrucosus s. str. Recent work also indicated the presence of T. himalayanus Khatiwada, Wang, Ghimire, Vasudevan, Paudel & Jiang, 2015 (a species described from Nepalese Himalaya) in northern Myanmar, but without providing voucher specimen information or any other justification for this identification (Hernandez, 2016; Hernandez, 2018). The recent monographic review of the genus Tylototriton by Hernandez (2016) also indicated the possibility of the occurrence of T. uyenoi Nishikawa, Khonsue, Pomchote & Matsui, 2013 and T. shanjing Nussbaum, Brodie & Yang, 1995 in parts of Myanmar adjacent to northern Thailand and the southwestern Yunnan Province of China; however, these records are not supported by voucher specimens.…”

Section: Introductionmentioning

confidence: 99%

A new species of Crocodile Newt, genus Tylototriton (Amphibia, Caudata, Salamandridae) from the mountains of Kachin State, northern Myanmar

Zaw¹,

Lay²,

Pawangkhanant³

et al. 2019

Zoological Research

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We describe a new species of the genus Tylototriton from Ingyin Taung Mt., Mohnyin Township, Kachin State, Myanmar, based on morphological and molecular evidence. The new species is assigned to the subgenus Tylototriton s. str. and is clearly distinct from all known congeners by the following characters: medium body size; thin, long tail, lacking lateral grooves; rough skin; truncate snout; wide, protruding supratemporal bony ridges on head, beginning at anterior corner of orbit; weak, almost indistinct sagittal ridge; long, thin limbs, broadly overlapping when adpressed along body; distinct, wide, non-segmented vertebral ridge; 13 or 14 rib nodules; brown to dark-brown background coloration with dull orange-brown to yellowish-brown markings on labial regions, parotoids, rib nodules, whole limbs, vent, and ventral tail ridge. We also briefly discuss biogeography and species diversity of the genus Tylototriton in Myanmar.

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“…Surveying in different months and years reduced the uncertainty associated with interannual variability in the use of aquatic habitats by amphibians under unstable hydrological regimes (Gómez-Rodríguez et al 2010). Area-constrained surveys (30 × 30 m) were conducted by assessing ponds, springs, and streams for larvae (Duguet and Melki 2003), and assessing terrestrial habitats on foot for adults during the day and at night in rainy weather (Hernandez et al 2018). We lifted rock and logs under which larvae and adult salamanders usually seek refuge.…”

Section: Study Area and Surveysmentioning

confidence: 99%

“…The efficiency of the model in determining the presence of S. corsica at the study sites was assessed using random forests (Cutler et al 2007). This classification method has been shown to be superior to other classification algorithms, and is less prone to overfit when using high dimensional datasets (Hastie et al 2009;Broennimann et al 2012). We built two models, one including only macro-ecological parameters (hereafter ŷ1 model) and having a spatial resolution of 250-1000 m (except for elevation, which had a spatial resolution of 15 m).…”

Section: Data Analysesmentioning

confidence: 99%

Using hierarchical spatial models to assess the occurrence of an island endemism: the case of Salamandra corsica

Escoriza

Hernández

2019

Ecol Process

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Background: Island species are vulnerable to rapid extinction, so it is important to develop accurate methods to determine their occurrence and habitat preferences. In this study, we assessed two methods for modeling the occurrence of the Corsican endemic Salamandra corsica, based on macro-ecological and fine habitat descriptors. We expected that models based on habitat descriptors would better estimate S. corsica occurrence, because its distribution could be influenced by micro-environmental gradients. The occurrence of S. corsica was modeled according to two ensembles of variables using random forests. Results: Salamandra corsica was mainly found in forested habitats, with a complex vertical structure. These habitats are associated with more stable environmental conditions. The model based on fine habitat descriptors was better able to predict occurrence, and gave no false negatives. The model based on macro-ecological variables underestimated the occurrence of the species on its ecological boundary, which is important as such locations may facilitate interpopulation connectivity. Conclusions: Implementing fine spatial resolution models requires greater investment of resources, but this is advisable for study of microendemic species, where it is important to reduce type II error (false negatives).

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Patterns of niche diversification in south-east Asian crocodile newts

Cited by 14 publications

References 54 publications

Integrative taxonomy reveals three new taxa within the Tylototriton asperrimus complex (Caudata, Salamandridae) from Vietnam

Integrative taxonomy reveals three new taxa within the Tylototriton asperrimus complex (Caudata, Salamandridae) from Vietnam

A new species of Crocodile Newt, genus Tylototriton (Amphibia, Caudata, Salamandridae) from the mountains of Kachin State, northern Myanmar

Using hierarchical spatial models to assess the occurrence of an island endemism: the case of Salamandra corsica

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