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229 results for “Mekong”
FIGURE 4 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 4. Corvospongilla lampaoensis sp. nov. (Spongillida) holotype CNR–POR–FW 120 from Thailand. A, Light Microscopy micrographs. Skeletal microscleres pseudobirotules with smooth, thin shaft and pseudorotules as curved hooks at tips. B, Scanning Electron Micrographs of microscleres.
FIGURE 2 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 2. Habitat of Corvospongilla lampaoensis sp. nov. (Spongillida) from the Lower Mekong Basin at Lam Pao Thepsuda Bridge site 4 (Figure 1) type locality, in the Lam Pao Reservoir (Kalasin Province, Thailand). A–B, Manmade substrata on rafts for fish cage culture. C, Encrusting habitus in dry condition of CNR–POR–FW 120 holotype in situ on a plastic buoy (black dashed line square, Figure 2C) after sampling of a part (see also Figure 3A–B), and paratype CNR-POR-FW 121-12 (black asterisk) on a rubber tire.
FIGURE 3 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 3. Corvospongilla lampaoensis sp. nov. (Spongillida) holotype CNR-POR-FW 120 from Thailand. SEM micrographs (C–F). A, Dry encrusting thin specimen (top view). B, Dry encrusting thin specimen with sessile gemmules at the level of basal spongin plate (bottom view). C, Skeletal meshwork of acanthoxeas megascleres. D, Skeletal meshwork of acanthoxeas megascleres (top view). E, Acanthoxeas megascleres with microspiny surface except at abruptly pointed tips. F, Acanthoxeas megascleres, pseudobirotules microscleres (arrows) and probable larval spicule (asterisk).
FIGURE 6 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 6. Corvospongilla lampaoensis sp. nov. (Spongillida) holotype CNR-POR-FW 120 from Thailand. Scanning Electron Micrographs. Gemmular theca architecture of sessile gemmules adhering to basal spongin plate. A, Entire gemmule with few, scattered megascleres (top view). B, Sessile gemmule with scattered thin laminae lining upper portion of theca (white arrow) and smooth, compact inner layer (white arrowhead) and chambered pneumatic layer in basal portion of theca (inner view, cross section). C, Entire sessile gemmule with fragments of basal spongin plate (arrow). D, Gemmular theca (white arrowhead) armed by gemmuloscleres in variably oriented multilayers and scantly developed outer layer and pneumatic layer (cross section); thecamoebae (white arrow). E, Outer layer as a thin pellicle covering spicules (white arrowhead), pneumatic layer absent and inner layer scantly developed (white arrow) in a strongly armed gemmular theca (cross section). F, Pneumatic layer scattered among gemmuloscleres (right) and smooth, compact inner layer of gemmular theca (white arrowhead, cross section). G, Pneumatic layer thin and continuous with dense, minute rounded chambers among few gemmuloscleres in gemmular theca with well-developed outer layer (white arrow, cross section).
Bulk and amino acid nitrogen specific isotope data from particulate organic matter and mesozooplankton (1000-2000 µm) from the Mekong River plume and southern South China Sea
<p><strong><span><span>The mean trophic position (TP) of mesozooplankton largely determines how much mass and energy is available for higher trophic levels like fish. Unfortunately, the ratio of herbivores to carnivores in mesozooplankton is difficult to identify in field samples. Here we investigated changes in the mean TP of mesozooplankton in a highly dynamic environment encompassing four distinct habitats in </span></span></strong>the southern South China Sea:<strong> </strong><span>the </span>Mekong River plume, coastal upwelling region, shelf waters, and offshore oceanic waters<strong><span>. </span></strong><span>We used a set of parameters derived from bulk and amino acid nitrogen stable isotopes from particulate organic matter (POM) and four mesozooplankton size fractions to identify changes in the nitrogen source and structure of the planktonic food web across these habitats.</span> We found clear indications of a shift in N sources for biological production from nitrate in near-coastal waters towards an increase in diazotroph-N inputs in oceanic waters where diazotrophs shaped the phytoplankton community. The shift in N source was accompanied by a lengthening of the food chain (increase in the TP), which may provide further support for the connection between diazotrophy and the indirect routing of N through the marine food web. Our combined bulk and amino acid δ<sup>15</sup>N approach also allowed us to estimate the trophic enrichment (TE) of mesozooplankton across the entire regional ecosystem. When put in the context of literature values, our high TE of 5.1‰ suggested a link between ecosystem heterogeneity and the less efficient transfer of mass and energy across trophic levels.</p>
Figure 20 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 20. Mekongbathynella jayavarthoni sp. n. (Holotype: ♀). (a), uropod (dorsal); (b), pleotelson and furcal rami (dorsal); (c), pleotelson, uropod and furcal ramus (lateral). Scale bars = 0.05 mm.
Figure 19 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 19. Mekongbathynella jayavarthoni sp. n. (Holotype: ♀; allotype: ♂). (a), thoracopod VII ♂ (frontal); (b), thoracopod VIII ♀ (ventral); (c), thoracopod VIII ♀ (lateral); (d), thoracopod VIII ♂ (inner lateral); (e), right and left thoracopods VIII ♂ (ventral). Scale bars = 0.05 mm.
Figure 17 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 17. Mekongbathynella jayavarthoni sp. n. (Holotype: ♀). (a), mandible (dorsal); (b), mandible (inner lateral); (c), maxillule (dorsal); (d). maxilla (dorsal); (e), thoracopod I (frontal); (f), thoracopod II (frontal). Scale bars = 0.05 mm.
Figure 13 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 13. Mekongbathynella jayavarmani sp. n. (Holotype: ♀). (a), thoracopod IV (frontal); (b), thoracopod V (frontal); (c), thoracopod VI (frontal); (d), thoracopod VIII (ventral). Scale bar = 0.05 mm.
Figure 12 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 12. Mekongbathynella jayavarmani sp. n. (Holotype: ♀). (a), maxillule (dorsal); (b). maxilla (dorsal); (c), thoracopod I (frontal); (d), thoracopod II (frontal); (e), thoracopod III (frontal). Scale bars = 0.05 mm.
Figure 10 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 10. Mekongbathynella pienensis sp. n. (Holotype: ♀). (a), uropod (dorsal); (b), pleotelson and furcal rami (dorsal); (c), pleotelson, uropod and furcal ramus (lateral). Scale bars = 0.05 mm.
Figure 18 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 18. Mekongbathynella jayavarthoni sp. n. (Holotype: ♀; allotype: ♂). (a), thoracopod III ♂ (frontal); (b), thoracopod IV ♂ (frontal); (c), thoracopod V ♂ (frontal); (d), thoracopod VI ♂ (frontal); (e), protopod of thoracopod VI ♀ (frontal). Scale bar = 0.05 mm.
Figure 9 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 9. Mekongbathynella pienensis sp. n. (Holotype: ♀; allotype: ♂). (a), thoracopod VII ♀ (frontal); (b), thoracopod VIII ♂ (inner lateral); (c), right and left thoracopods VIII ♂ (ventral). Scale bars = 0.05 mm.
Figure 8 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 8. Mekongbathynella pienensis sp. n. (Holotype: ♀). (a), thoracopod IV (frontal); (b), thoracopod V (frontal); (c), thoracopod VI (frontal); (d), thoracopod VIII (lateral); (e), thoracopod VI (ventral). Scale bar = 0.05 mm.
Figure 7 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 7. Mekongbathynella pienensis sp. n. (Holotype: ♀). (a), maxillule (dorsal); (b). maxilla (dorsal); (c), thoracopod I (frontal); (d), thoracopod II (frontal); (e), thoracopod III (frontal). Scale bars = 0.05 mm.
Figure 21 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 21. Map showing the type localities of the two known and four new species of Mekongbathynella: 1. M. sesanensis Nam and Cho, 2014 and M. kryi Nam and Cho, 2014; 2. M. kampucheana sp. n. and M. jayavarmani sp. n.; 3. M. pienensis sp. n. and M. jayavarthoni sp. n. (Semi-) Circles in dotted line indicate the reaches of the Mekong in Cambodian boundary sensu Cogels (2005).
Figure 5 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 5. Mekongbathynella kampucheana sp. n. (Holotype: ♀). (a), uropod (dorsal); (b), pleotelson and furcal rami (dorsal); (c), pleotelson, uropod and furcal ramus (lateral). Scale bars = 0.05 mm.
Figure 4 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 4. Mekongbathynella kampucheana sp. n. (Holotype: ♀; allotype: ♂). (a), thoracopod VII ♀ (frontal); (b), thoracopod VIII ♀ (lateral); (c), thoracopod VIII ♀ (ventral); (d), right and left thoracopod VIII ♂ (ventral); (e), thoracopod VIII ♂ (inner lateral). Scale bars = 0.05 mm.
Figure 3 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 3. Mekongbathynella kampucheana sp. n. (Holotype: ♀). (a), thoracopod IV (frontal); (b), thoracopod V (frontal); (c), thoracopod VI (frontal). Scale bar = 0.05 mm.
Figure 2 in Four new species of Parabathynellidae (Bathynellacea, Syncarida) from the interstitial environment of the Mekong River
Figure 2. Mekongbathynella kampucheana sp. n. (Holotype: ♀). (a), mandible (dorsal); (b), mandibular incisor process and molar process ♀ (inner lateral); (c), maxillule (dorsal); (d). maxilla (dorsal); (e), thoracopod I (frontal); (f), thoracopod II (frontal); (g), thoracopod III (frontal). Scale bars = 0.05 mm.
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OpenNeuro
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