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29 results for “Lower Mekong Basin”
FIGURE 3. Corvospongilla siamensis. Holotype MSNG 56533 in Biodiversity assessment of the Lower Mekong Basin: A new species of Corvospongilla (Porifera: Spongillina: Spongillidae) from Thailand
FIGURE 3. Corvospongilla siamensis. Holotype MSNG 56533 from the Pong River (Lower Mekong Basin, Thailand). Micrographs (SEM) of the spicular complement. A, Skeletal alveolate network with ascending plurispicular tracts (arrows) to support conules at the surface (lateral view); B, Detail of alveolate skeleton of strongyles and micropseudobirotules (inset); C, Skeletal megascleres, as strongyle with microspined surface (inset, right), and tips of the rare tubercled oxeas (inset, left); D, Apices variably shaped of strongyles and a microsclere; E, micropseudobirotules entirely smooth with pseudobirotules armoured by recurved hooks; F, strongyles, with tubercles and spines, shared by gemmular theca and gemmular cage.
FIGURE 2. Corvospongilla siamensis. A, Holotype MSNG 56533 in Biodiversity assessment of the Lower Mekong Basin: A new species of Corvospongilla (Porifera: Spongillina: Spongillidae) from Thailand
FIGURE 2. Corvospongilla siamensis. A, Holotype MSNG 56533 from the Pong River (Lower Mekong Basin, Thailand). B, Detail of a chimney-like lobe with apical oscule and conulose surface. C, Spicular complement. Strongyle and micropseudobirotule from the skeletal network, and strongyle from the gemmular theca.
FIGURE 1 in Biodiversity assessment of the Lower Mekong Basin: A new species of Corvospongilla (Porifera: Spongillina: Spongillidae) from Thailand
FIGURE 1. Biogeographic pattern of the genus Corvospongilla (modified from Manconi & Pronzato, 2002, 2004). The type locality of Corvospongilla siamensis at Ban Huai Sai (16˚46ˏ20.40˝N, 102˚42ˏ48.22˝E) (Pong River, Lower Mekong Basin, Thailand) is indicated by an arrow.
FIGURE 4. Corvospongilla siamensis. Holotype MSNG 56533 in Biodiversity assessment of the Lower Mekong Basin: A new species of Corvospongilla (Porifera: Spongillina: Spongillidae) from Thailand
FIGURE 4. Corvospongilla siamensis. Holotype MSNG 56533 from the Pong River (Lower Mekong Basin, Thailand). Micrographs (SEM) of gemmules. A, Gemmules of the sessile morph in a cluster sharing the gemmular cage strictly adhering to the basal spongin plate. Each hemispherical cage envelopes one gemmular theca; B, Strongyles variably shaped at the outer surface of the gemmular cage, typical button-like gemmuloscleres are indicated by arrows; C, D, Gemmular theca variably shaped, bearing tangentially gemmuloscleres embedded in compact spongin; E, Gemmular theca surrounded by the not adhering stout spicular cage (cross section); F, Foramen with compact and chambered spongin armed by a few gemmuloscleres; G, Gemmular theca (cross section) of sublayered compact spongin protecting the mass of totipotent cells; H, Detail of the gemmular theca (cross section) of compact sublayered spongin armed by gemmuloscleres as tangential strongyles with spiny tips.
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.
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>
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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FIGURE 5 in Biodiversity assessment of the Lower Mekong Basin: evolutionary novelties in gemmular morphotraits of Genus Corvospongilla (Porifera: Spongillida) with description of a new species from Khorat Plateau, and biogeographic notes
FIGURE 5. Corvospongilla lampaoensis sp. nov. (Spongillida) holotype CNR-POR-FW 120 from Thailand. Scanning Electron Micrographs. A, Gemmules strongly armed by spicules grouped in a carpet. B, Gemmuloscleres in a dense mosaic-like arrangement at gemmular surface (detail of A). C, Gemmuloscleres acanthostrongyles and acanthostrongyloxeas with variably dense small tubercles and spines. D, Aberrant acanthostrongyles. E, Details of gemmuloscleres ornamentations and tips outlines. F, Megascleres acanthoxeas at the level of scantly developed gemmular cage mixed with gemmuloscleres. Acanthoxeas with scattered, small, conical spines except for tips (diverging from abruptly pointed tips of skeletal acanthoxeas).
FIGURE 1. A in Biodiversity assessment of the Lower Mekong Basin: evolutionary novelties in gemmular morphotraits of Genus Corvospongilla (Porifera: Spongillida) with description of a new species from Khorat Plateau, and biogeographic notes
FIGURE 1. A, Map of the Lower Mekong hydrographic basin showing the major tributaries in Khorat Plateau, northeast Thailand. Study area of freshwater sponges (Spongillida) at the Lam Pao Reservoir, (Lam Pao River basin), indicated by a red dashed line square. B, Four sampling sites (red) at the Lam Pao Reservoir 1) Na Chueak (Yang Talat District), 2) Lam Pao (Mueang Kalasin District), 3) Phu Din (Mueang Kalasin District), and 4) Lam Pao near Thepsuda Bridge (Nong Bua, Nong Kung Si District). C, Type locality of Corvospongilla lampaoensis sp. nov. near Thepsuda Bridge, site 4 (16°42'42.1"N, 103°27'00.6"E) Lam Pao Reservoir, 163 m asl, Nong Bua, Nong Kung Si District, Kalasin Province, Thailand.
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