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124 results for “Mekong River”
FIGURE 5 in Pseudoleptonema tansoongnerni new species (Hydropsychidae: Trichoptera) with species list of Trichoptera from Li Phi Falls, Mekong River, southern Laos
FIGURE 5. Male right forewing of Pseudoleptonema tansoongnerni n. sp., dorsal.
FIGURE 8 in Pseudoleptonema tansoongnerni new species (Hydropsychidae: Trichoptera) with species list of Trichoptera from Li Phi Falls, Mekong River, southern Laos
FIGURE 8. Female right forewing of Pseudoleptonema tansoongnerni n. sp., dorsal.
Fig. 5 in A new species of copepod (Copepoda: Calanoida) from the floodplain of the lower Mekong River Basin in Thailand and Cambodia, with an amended diagnosis of the genus Dentodiaptomus Shen & Tai, 1964
Fig. 5. Dentodiaptomus orientalis, new species, male: A, P1; B, P2; C, P3; D, P4; E, P5, posterior view; F, a part of the right P5 Exp-2, lateral view; G, left P5 Exp-2, posterior view; H, left P5 Exp-2, frontal view.
Figure 3 from: Thamsenanupap P, Malicky H, Vongsombath C, Laudee P (2021) Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159. https://doi.org/10.3897/zookeys.1055.66536
Figure 3 Setodes karrilai, sp. nov. Male genitalia A segment X, preanal appendages, dorsal B segments IX and X, preanal appendages, inferior appendages, left lateral C segment IX, inferior appendages, ventral D phallus, left lateral. Abbreviations: Seg IX = segment IX, Pre = preanal appendage (paired), Inf = inferior appendage (paired).
Figure 1 from: Thamsenanupap P, Malicky H, Vongsombath C, Laudee P (2021) Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159. https://doi.org/10.3897/zookeys.1055.66536
Figure 1 Orthotrichia choengthongi, sp. nov. Male genitalia A tergum IX and tergum X, dorsal B terga IX and X and inferior appendages, left lateral C terga IX and X and inferior appendages, right lateral D inferior appendages and paramere, ventral E phallus, left lateral. Abbreviations: Te IX = tergum IX, Pos = Posterolateral process (paired), Do = Doral spine, Te X = tergum X, Inf = united inferior appendages, Tu = Tubular processes, Par = Paramere.
Figure 4 from: Thamsenanupap P, Malicky H, Vongsombath C, Laudee P (2021) Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159. https://doi.org/10.3897/zookeys.1055.66536
Figure 4 Study sites from Mekong A, B Khon Phapheng Waterfall, Paksong, Pakse Province C, D Don Khon, Paksong, Pakse Province.
Figure 2 from: Thamsenanupap P, Malicky H, Vongsombath C, Laudee P (2021) Three new species of caddisflies (Trichoptera, Hydroptilidae, Polycentropodidae, Leptoceridae) from Khon Phapheng Waterfall, the Mekong River, Laos. ZooKeys 1055: 149-159. https://doi.org/10.3897/zookeys.1055.66536
Figure 2 Pseudoneureclipsis khonphaphengensis, sp. nov. Male genitalia A segment X, preanal appendages and intermediate appendages, dorsal B segments IX and X and inferior appendages, left lateral C inferior appendages, ventral D phallus, left lateral; the arrow shows hooked phallic sclerite, ventral E phallus, dorsal. Abbreviations: Seg IX = segment IX, Seg X = segment X, Pre = preanal appendages, Int = Intermediate appendage, Inf = inferior appendage (paired), Bas = basodorsal process of inferior appendage.
Fig. 4 in Molecular phylogeny reveals a new genus of freshwater mussels from the Mekong River Basin (Bivalvia: Unionidae)
Fig. 4. Namkongnaia inkhavilayi gen. et sp. nov. A. Holotype MUMNH-UNI2831. B. Paratype MUMNH-UNI2836, both from the type localty in Xe Bangfai River, Kammoune Province, Laos. Scale bars: 10 mm.
Supplementary material 2 from: Konopleva ES, Bolotov IN, Vikhrev IV, Inkhavilay K, Gofarov MYu, Kondakov AV, Tomilova AA, Chapurina YE, Van Do T, Pfeiffer JM, Lopes-Lima M, Bogan AE (2023) A freshwater mussel species reflects a Miocene stream capture between the Mekong Basin and East Asian rivers. Zoosystematics and Evolution 99(1): 29-43. https://doi.org/10.3897/zse.99.90784
Freshwater mussel specimens used in geometric morphometric analyses and results of PCA
Supplementary material 3 from: Konopleva ES, Bolotov IN, Vikhrev IV, Inkhavilay K, Gofarov MYu, Kondakov AV, Tomilova AA, Chapurina YE, Van Do T, Pfeiffer JM, Lopes-Lima M, Bogan AE (2023) A freshwater mussel species reflects a Miocene stream capture between the Mekong Basin and East Asian rivers. Zoosystematics and Evolution 99(1): 29-43. https://doi.org/10.3897/zse.99.90784
Results of Kruskal-Wallis test, including Chi-square and P-values for each principal component
Figure 3 in Glyptothorax irroratus, a new species of rheophilic catfish from the Mekong River drainage (Actinopterygii: Siluriformes: Sisoridae)
Figure 3. Type locality of Glyptothorax irroratus (Nam Ngiep at Keng Chong rapids, Laos).
Genomic structure of the Sicklefin Barb, Puntioplites falcifer (Cyprinidae), in the lower Mekong River basin reveals patterns of both migration and population partitioning
<p>Effective management of the Sicklefin Barb, <i>Puntioplites falcifer</i>, with the planned construction of several dams in the Mekong River Basin depends upon disentangling conflicting reports of isolated populations and highly migratory behavior. We investigated patterns of population genomic structure, relatedness, and inferred connectivity among three locations on the Mekong and a fourth at Attapeu on the Sekong tributary. The results supported both isolation of populations and migratory behavior. STRUCTURE, AMOVA, and PCA revealed three distinct nDNA clusters. The most divergent nDNA cluster (pairwise <i>F</i><sub>ST</sub> ≥ 0.43, <i>p < </i>0.0001) exhibited negligible inferred relative migration rates with the other samples (<i>m</i> ≤ 0.02), including those from common sampling locations, and was likely a different species - putatively <i>P. proctozysron </i>(Ppr). However, mtDNA barcoding suggested differentiation between Ppr and a published mtDNA genome for this species. Most of the fish from the Sekong tributary belonged to a second distinct nDNA cluster and the sample from that location was differentiated from the Mekong sites (pairwise <i>F</i><sub>ST</sub> = 0.02 - 0.03, <i>p</i> < 0.0001). Supporting migration, a third nDNA cluster exhibited high rates of migration among the Mekong locations (<i>m</i> = 0.6 - 1) and was found in small numbers at the Sekong location which was characterized by intermediate migration rates with the Mekong (<i>m</i> = 0.3 - 0.4). Mitochondrial DNA barcoding indicated that the fish comprising the Mekong and Sekong nDNA clusters were differentiated from a <i>P. falcifer </i>mtDNA genome sampled well upstream of the Mekong locations in this study. Estimates of <i>N</i><sub>e</sub> by both location and nDNA cluster were near or below the minimal sustainable size (173-1651), suggesting susceptibility to over-exploitation or population fragmentation. Together, these results suggest that proposed hydropower dams could subdivide connected Mekong populations, isolate and split the Sekong population, and further drive down <i>N</i><sub>e</sub> if accommodations are not made to facilitate connectivity. Additionally, the combined pattern of nDNA and mtDNA diversity is consistent with substantial cryptic diversity and a <i>P. falcifer</i> – <i>P. proctozysron</i> species complex that could be further described with rigorous population genomic surveys and expanded geographic sampling.</p>
Supported Datasets for the Research Titled: "Impacts of Climate and Land Use Changes on Streamflow in the Mun-Chi River Basin, the Largest Tributary of the Mekong River"
<p><strong>Supported Datasets for the Research Titled: "Impacts of Climate and Land Use Changes on Streamflow in the Mun-Chi River Basin, the Largest Tributary of the Mekong River"</strong></p> <p>Abstract: </p> <p><span>The impact of climate change and human activities poses significant challenges in the tropical region of Southeast Asia, specifically within the Mun-Chi River Basin, the largest tributary of the Mekong River in Thailand. The bias-corrected MPI-ESM1-2-LR, the most appropriate Global Climate Model (GCM) under the Coupled Model Intercomparison Project Phase 6 (CMIP6) for projecting Mun-Chi River flow, represent future climate variations in this basin. The analysis reveals forthcoming transformations in future land use, with cropland areas transitioning into forests and urban areas. While the projected annual streamflow contributing to the Lower Mekong River is expected to slightly increase by up to 4%, with 67% attributed to climate change and 33% to land-use change, temporal variations in the future flow regime reveal a wetter wet season and a drier dry season in this catchment. During the wet season, streamflow is projected to rise by 5% to 18% in 2023-2035 and 10% to 24% in 2036-2050. In contrast, the dry season is expected to experience a decrease of -3% to -9% in 2023-2035 and -6% to -17% in 2036-2050. Projected streamflow fluctuations are more pronounced in mountainous areas and upstream tributaries. These seasonal contrasts highlight the potential impact of more severe drought during the dry season and more severe flooding during the wet season. These potential increases in extreme hydrological events present challenges for efficient water resource management in this watershed and downstream countries. Consequently, effective water regulation and land-use policies are deemed crucial for sustainable management in the Mun-Chi River Basin.</span></p>
Genomic structure of the Sicklefin Barb, Puntioplites falcifer (Cyprinidae), in the lower Mekong River basin reveals patterns of both migration and population partitioning
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Distribution. SE Asian coastal waters and river mouths including Bay of Bengal, Ganges Delta, Strait of Malacca, Gulf of Thailand, Sunda Shelf, and Malampaya Sound (Palawan), also in Irrawady (= Ayeyarwady), Mekong, and Mahakam river systems, Chilika and Songkhla lakes. A population that once inhabited Tonle Sap Great Lake in Cambodia has been extirpated. in Delphinidae
Distribution. SE Asian coastal waters and river mouths including Bay of Bengal, Ganges Delta, Strait of Malacca, Gulf of Thailand, Sunda Shelf, and Malampaya Sound (Palawan), also in Irrawady (= Ayeyarwady), Mekong, and Mahakam river systems, Chilika and Songkhla lakes. A population that once inhabited Tonle Sap Great Lake in Cambodia has been extirpated.
Subspecies and Distribution. H.l.larLinnaeus,1771—MalayPeninsula,from9°NtotheMudahRiverandSofthePerakRiver. H.l.carpenteriGroves,1968—EMyanmar,NWLaos,andNWThailand,fromChiengDaoat19°22°Nto¢.16°N.H..entelloides1.GeoffroySaint-Hilaire,1842—SMyanmarandSWThailand,fromc.15°No10°N. H.l.vestitusG.S.Miller,1942—NSumatra,NWofLakeTobaandtheSingkilRiver. H. l. yunnanensis Ma & Wang, 1986 — S China (SW Yunnan Province), the northernmost subspecies, originally between the Nujiang (= Salween) and Lancangjiang (= Mekong) rivers in the counties of Cangyuan, Menglian, and Ximeng; by the 1960s limited to the Nangun River at elevations of 1000-1500 m, but now probably extinct there. in Hylobatidae
Subspecies and Distribution. H.l.larLinnaeus,1771—MalayPeninsula,from9°NtotheMudahRiverandSofthePerakRiver. H.l.carpenteriGroves,1968—EMyanmar,NWLaos,andNWThailand,fromChiengDaoat19°22°Nto¢.16°N.H..entelloides1.GeoffroySaint-Hilaire,1842—SMyanmarandSWThailand,fromc.15°No10°N. H.l.vestitusG.S.Miller,1942—NSumatra,NWofLakeTobaandtheSingkilRiver. H. l. yunnanensis Ma & Wang, 1986 — S China (SW Yunnan Province), the northernmost subspecies, originally between the Nujiang (= Salween) and Lancangjiang (= Mekong) rivers in the counties of Cangyuan, Menglian, and Ximeng; by the 1960s limited to the Nangun River at elevations of 1000-1500 m, but now probably extinct there.
FIGURE 5 in A new species of Dwarf Japalura sensu lato (Reptilia: Squamata: Agamidae) from the upper Mekong River in Eastern Tibet, China, with notes on morphological variation, distribution, and conservation of two congeners along the same river
FIGURE 5. Comparisons of live males (columns 1, 2) and females (columns 3, 4) among Japalura drukdaypo sp. nov. (row A), J. batangensis (row B), J. vela (row C), J. laeviventris (row D), and J. flaviceps (row E). Photos by Kai WANG and Xu ZHANG.
FIGURE 3 in A new species of Dwarf Japalura sensu lato (Reptilia: Squamata: Agamidae) from the upper Mekong River in Eastern Tibet, China, with notes on morphological variation, distribution, and conservation of two congeners along the same river
FIGURE 3. Dorsal (1), ventral (2), and lateral close-up (3) comparisons of male Japalura drukdaypo sp. nov. (holotype KIZ 027619) and J. vela (KIZ 027670), showing the relatively shorter tail, shorter hind limbs, smoother ventral scales, and feeble and non-erecting crest of J. drukdaypo sp. nov. compared with the closely distributed population of J. vela from Tongsha, Markam Prefecture, Tibet, China. Images are not to scale. Photos by Kai WANG.
Figure 16 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 16. Mekongbathynella jayavarthoni sp. n. (Holotype: ♀; allotype: ♂). (a), general habitus ♂ (lateral); (b), antennule ♀ (dorsal); (c), antennule ♂ (dorsal); (d). second antennular segment ♂ (ventral); (e), antenna ♀ (dorsal); (f), labrum ♀ (ventral). Scale bars = 0.05 mm, unless otherwise specified.
Figure 15 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 15. Mekongbathynella jayavarmani sp. n. (Holotype: ♀). (a), uropod (dorsal); (b), pleotelson and furcal rami (dorsal); (c), pleotelson, uropod and furcal ramus (lateral). Scale bars = 0.05 mm.
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