Freshwater Eels and Humans in Taiwan

Tzeng, Wann‐Nian

doi:10.1007/978-4-431-54529-3_9

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…No additional specimens have been collected so far; its validity has remained yet to be resolved. Taiwanese spiny eels were previously identified as Macrognathus aculeatum (Bloch, 1786) (= Sinobdella sinensis ) ( Tzeng 1986 ). It has been considered as a subspecies of S. sinensis in the annotated checklist and type catalogue of fish genera and species described from Taiwan by Ho and Shao (2011) .…”

Section: Discussionmentioning

confidence: 99%

Sinobdella longitubulus, a new species of spiny eel (Pisces, Mastacembelidae) from the Zhu-Jiang Basin, with a note on the type locality of S. sinensis (Bleeker, 1870)

Shan,

Li,

Zhang

2024

BDJ

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The spiny eel genus Sinobdella belongs to the family Mastacembelidae of the order Synbranchiformes. Kottelat and Lim (1994) utilised Rhynchobdella sinensis as the type species to propose the genus. Currently, it contains a single species widespread in eastern and southern China and northern Vietnam. Sinobdella longitubulus, a new species of spiny eel, is here described from the Xi-Jiang of the Zhu-Jiang Basin in Guangxi Zhuang Autonomous Region, southern China. It differs from the single congeneric species S. sinensis in having a more or less white-brown reticulated pattern on the flank, two tubular anterior nostrils longer than or equal to the rostral appendage, an anal fin heavily mottled with dark brown markings and white spots and bearing a narrow white distal margin; shorter pre-anal length; and fewer abdominal vertebrae. The validity of this new species is corroborated by its monophyly recovered in a COI gene-based phylogenetic analysis and its significant sequence divergence with S. sinensis. A note on the type locality of S. sinensis is also given; its type specimen is possibly from mountain streams of Jiangxi Province, in the lower Chang-Jiang Basin.

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Section: Discussionmentioning

confidence: 99%

Sinobdella longitubulus, a new species of spiny eel (Pisces, Mastacembelidae) from the Zhu-Jiang Basin, with a note on the type locality of S. sinensis (Bleeker, 1870)

Shan,

Li,

Zhang

2024

BDJ

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“…Subsequent to the execution of the CVA, a graphical representation was constructed by plotting the primary pair of canonical scores. This plot was further complemented with the illustration of 95% confidence ellipses, circumscribing the mean of each individual sample, thereby providing a visual affirmation of the confidence levels associated with the observed samples [3,4,55,56]. In order to assess the statistical significance pertaining to the morphometric disparities observed between different groups, elucidated through the application of the cluster analysis and canonical variate analysis (CVA), a methodical randomization test was conducted [6,56,57].…”

Section: Morphometric Variation Analysesmentioning

confidence: 99%

“…Variations in morphological characteristics can serve as an analytical tool to investigate the distinctions among geographically disparate populations; this methodology has also been employed to ascribe various genetic configurations or environmental circumstances to individual geographic locales [2]. Prior investigations have evidenced that fluctuations in environmental conditions precipitate alterations in population organization, encompassing morphological heterogeneity [3][4][5][6][7][8][9][10][11]. From a historical standpoint, methodical observations have elucidated that geographical phenomena wield a more substantial impact on the dispersal patterns of marine species relative to their terrestrial analogs [12].…”

Section: Introductionmentioning

confidence: 99%

Morphometric Differentiation of the Swimming Crab Portunus sanguinolentus (Herbst, 1783) Populations in East Asia: Implications for Stock Identification and Management

Kao,

Chang,

Shih

et al. 2023

Water

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Morphometric disparities were employed to characterize the geographical variations in and elucidate the phylogeography of Portunus sanguinolentus in East Asia. In this study, a comprehensive assessment was undertaken based on measurements from 833 individual crabs. These crabs were sampled from eight distinct locations, namely Kyushu (KS), Fuzhou (FZ), Yilan (YL), Xiamen (XM), Tainan (TN), Hong Kong (HK), Vietnam (VN), and Singapore (SG). Twelve morphometric measurements were standardized based on size using the allometric method. A cluster analysis and a canonical variate analysis (CVA) were then conducted for a data analysis. Randomization tests were subsequently performed to validate the morphometric differences observed among the groups. The analytical results classified the eight sampled populations into at least two distinct clusters. The first cluster included three samples from China (specifically FZ, XM, and HK), while the second cluster consisted of samples from East Asia (including KS, YL, TN, VN, and SG). The CVA revealed a tripartite division into three groups: the mainland China group (FZ, XM, and HK), the Kuroshio group (KS, YL, and TN), and the Southeast Asia group (VN and SG). The observed morphometric variations between these broad groups were statistically significant for both genders. These differences may be attributed to evolutionary origins, geographical events, or environmental adaptations. This study highlights the effectiveness of morphometric techniques in providing comprehensive insights into species delimitation and philogeographic relationships.

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“…Taiwan and Hainan Islands are isolated islands from the east of Asia continent and are known for their high levels of biodiversity and endemism ( Tzeng 1986 ; Kang et al 2014 ; Chen et al 2016 ; Feng et al 2016 ). Previous studies have suggested that the periodic emergence of a land bridge during Quaternary glacial cycles facilitated biotic interchanges between these islands and the neighboring mainland Asia ( Figure 1 ; Chiang et al 2010 ; He et al 2018 ; Wang et al 2021 ), followed by community assembly via environmental filtering ( Lin et al 2021 ).…”

mentioning

confidence: 99%

Historical connectivity and environmental filtering jointly determine the freshwater fish assemblages on Taiwan and Hainan Islands of China

Lin

Dai

et al. 2022

Current Zoology

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The biotas of Taiwan and Hainan Islands are of continental origin, but the manner with which historical and ecological factors shaped these insular species is still unclear. Here, we used freshwater fish as a model to fill this gap by quantifying the phylogenetic structure of the insular faunas and disentangling the relative contribution of potential drivers. Firstly, we used clustering and ordination analyses to identify regional species pools. To test whether the insular freshwater fish faunas were phylogenetically clustered or overdispersed, we calculated the net relatedness index (NRI) and the nearest taxon index (NTI). Finally, we implemented logistic regressions to disentangle the relative importance of species attributes (i.e. maximum body length, climatic niche dissimilarity, and diversification) and historical connectivity in explaining the insular faunas. Our results showed that the most possible species pools of Taiwan are Zhejiang and Fujian provinces, and those of Hainan are Guangdong and Guangxi provinces. These insular faunas showed random phylogenetic structures in terms of NRI values. According to the NTI values, however, the Taiwanese fauna displayed more phylogenetic clustering, while the Hainanese one was more overdispersed. Both the standard and phylogenetic logistic regressions identified historical connectivity and climatic niche dissimilarity as the two top explanatory variables for species assemblages on these islands. Our reconstruction of the paleo-connected drainage basins provides insight into how historical processes and ecological factors interact to shape the freshwater fish fauna of the East Asian islands.

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Freshwater Eels and Humans in Taiwan

Cited by 5 publications

References 29 publications

Sinobdella longitubulus, a new species of spiny eel (Pisces, Mastacembelidae) from the Zhu-Jiang Basin, with a note on the type locality of S. sinensis (Bleeker, 1870)

Sinobdella longitubulus, a new species of spiny eel (Pisces, Mastacembelidae) from the Zhu-Jiang Basin, with a note on the type locality of S. sinensis (Bleeker, 1870)

Morphometric Differentiation of the Swimming Crab Portunus sanguinolentus (Herbst, 1783) Populations in East Asia: Implications for Stock Identification and Management

Historical connectivity and environmental filtering jointly determine the freshwater fish assemblages on Taiwan and Hainan Islands of China

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