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306 results for “freshwater snails”
Fig. 1 in Two Asian freshwater snails newly introduced into South Africa and an analysis of alien species reported to date
Fig. 1. Radix rubiginosa from Amatikulu (photos: H. Madsen).
Fig. 2 in Two Asian freshwater snails newly introduced into South Africa and an analysis of alien species reported to date
Fig. 2. Shells of Radix rubiginosa from Amatikulu (photos: N. Miranda). Scale bars = 5 mm.
Figures 2-6. Sumia macedonica n in New taxa of freshwater snails from Macedonia (Gastropoda: Hydrobiidae, Amnicolidae)
Figures 2-6. Sumia macedonica n. sp. 2: Holotype; 3-4: Paratype, 5-6: head with penis in situ.
Data from: Parasite resistance predicts fitness better than fecundity in a natural population of the freshwater snail Potamopyrgus antipodarum
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Data from: Evaluating shell variation across different populations of a freshwater snail
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Changes in transcriptomic response to salinity stress induce the brackish water adaptation in a freshwater snail
<p>Studying mechanisms of the establishment of a population in a novel environment allows us to examine the process of local adaptations and subsequent range expansion. In a river system, detecting genetic or phenotypic differences between a freshwater and brackish water population could contribute to our understanding of the initial process of brackish water adaptations. Here, we investigated behavioral and gene expression responses to the saltwater in a freshwater and brackish water population of the freshwater snail, <i>Semisulcospira reiniana</i>. Although the brackish water individuals exhibited significantly higher activity in saltwater than freshwater individuals in the first week, the activity of freshwater individuals increased in subsequent weeks, suggesting that their salinity tolerance was plastic rather than genetic. We found 476 and 1,002 differentially expressed genes across salinity conditions in the freshwater and brackish water populations, respectively. The major biological process involved in the salinity response of the freshwater population was the biosynthesis and metabolic process of nitrogen containing compounds, but that of the brackish water population was influenced by the chitin metabolic process. These results suggest that phenotypic plasticity induces the brackish water adaptation in the freshwater snail by modifying salinity response in the physiological process.</p>
Data from: Isotopic turnover rates and diet-tissue discrimination depend on feeding habits of freshwater snails
Estimates of animal diets and trophic structure using stable isotope analysis are strongly affected by diet-tissue discrimination and tissue turnover rates, yet these factors are often unknown for consumers because they must be measured using controlled-feeding studies. Furthermore, these parameters may be influenced by diet quality, growth, and other factors. We measured the effect of dietary protein content on diet-tissue discrimination and tissue turnover in three freshwater snail species. We fed lettuce to individually housed snails (n = 450 per species) for ten weeks, then half were switched to a high-protein diet. Isotopic values of muscle and gonad tissue were assessed at 48 and 80 days post-diet change. Snail discrimination factors varied by diet (low-protein > high-protein) and usually differed among species for both N and C, although species had similar carbon discrimination when fed the low-protein diet. Carbon turnover rates were similar among species for a given tissue type, but nitrogen turnover varied more among species. In addition, diet affected growth of species differently; some species grew larger on high-protein (H. trivolvis) while others grew larger on low-protein diet (Lymnaea spp.). These differences among species in growth influenced turnover rates, which were faster in the species with the highest growth rate following the diet switch from low to high-protein. Thus, growth is one of the main processes that affects tissue turnover, but growth and feeding preference did not affect diet-tissue discrimination, which was greater on low-protein than high-protein diets for all species regardless of growth performance. These results suggest that diet might influence two key parameters of stable isotope analysis differently.
FIGURE 7 in Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia
FIGURE 7. Molecular phylogeny of Tylomelania. Maximum Likelihood phylogram based on 851 bp of mitochondrial 16S rDNA (outgroup not shown). Malili lake species are marked by grey boxes, the position of the new species is indicated by a black bar. Numbers on branches are ML bootstrap values.
FIGURE 6. T in Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia
FIGURE 6. T. hannelorae sp. nov. (loc. 57-03). A–B. shells, A. holotype, MZB Gst. 12.114, B. paratypes, ZMB Moll. 190713. Scale bar = 1 cm. C. opercula, ZMB Moll. 190713. Scale bar = 1 mm. D–E. radula, ZMB Moll. 190713. D. segment, frontal, E. segment, apical (45°). Scale bar = 0.1 mm, F–H. embryonic shells, ZMB Moll. 190713. F. lateral view, G. apical whorls, lateral, H. apical view. Scale bar = 0.5 mm.
FIGURE 5. T in Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia
FIGURE 5. T. sinabartfeldi sp. nov., ZMB Moll. 108315 (loc. 58-99). A–D. radula, A,B, keeled shell morph, A. segment, frontal, B. segment, apical (45°); C,D. round shell morph, C. segment, frontal, D. segment, apical (45°). Scale bar = 0.1 mm. E–K. embryonic shells, E–G, round shell morph, E. lateral view, F. apical whorls, lateral, G. apical view; H–K, keeled shell morph, H. lateral view, I. apical whorls, lateral, K. apical view. Scale bar = 0.5 mm.
FIGURE 4. T in Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia
FIGURE 4. T. sinabartfeldi sp. nov. (loc. 58-99). A–D. shells, A. holotype, MZB Gst. 12.112, B. paratypes, ZMB Moll. 108315. Scale bar = 1 cm. C. opercula, ZMB Moll. 108315. Scale bar = 0.5 cm.
FIGURE 3. T in Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia
FIGURE 3. T. baskasti sp. nov., ZMB Moll. 190534 (loc. 15-02). A–B. radula, A. segment, frontal, B. segment, apical (45°). Scale bar = 0.1 mm. C–E. embryonic shells, C. lateral view, D. apical whorls, lateral, E. apical view. Scale bar = 1 mm.
FIGURE 2. T in Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia
FIGURE 2. T. baskasti sp. nov.; A–D. shells, A. holotype, MZB Gst. 12.108 (loc. 71-02), B. paratypes, ZMB Moll. 190535 (loc. 71-02), C. paratypes, ZMB Moll. 190534 (loc. 15-02), D. paratypes, ZMB Moll. 190533 (loc. 14-02). Scale bar = 1 cm. E–F. opercula, E. paratype, ZMB Moll. 190534 (loc. 15-02), F. paratype, ZMB Moll. 190533 (loc. 14-02). Scale bar = 0.5 cm.
FIGURE 1 in Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia
FIGURE 1. Sulawesi and the Malili lake system with sample sites. Locality numbers are the original field numbers and correspond to those in Tab. 1.
FIGURE 2 in A new freshwater snail (Caenogastropoda: Cochliopidae) from the Atacama Desert, northern Chile
FIGURE 2. Aguada de Chorrillos, Atacama Desert, northern Chile, the type locality of Heleobia deserticola sp. nov. A. Panoramic view of the system, desert, beach and Pacific Ocean. B. Spring where the snails live.
FIGURE 1. A–Q in A new freshwater snail (Caenogastropoda: Cochliopidae) from the Atacama Desert, northern Chile
FIGURE 1. A–Q. Heleobia deserticola sp. nov. A. Shell of the holotype (MZUC 43067). B–K. Shells of the paratypes (MZUC 43068–43077). L. Operculum (1.70 mm total length). M–O. Penes of three individuals (0.64, 0.70 and 0.90 mm total length, respectively). Operculum and penes were photographed from both sides. P, Q. Egg capsules of the new species. P. Egg capsules attached to the adult shells. Q. Pre–hatching capsule isolated with a shelled juvenile inside. R. Shell of an adult snail from Carrera Pinto (SL 3.51 mm, SW 1.55 mm, AL 1.35 mm, AW 0.97 mm. S. Penis of this individual (0.75 mm total length).
Figure 28 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 28. Distribution of three genera and stratigraphic region of Yunnan (adapted from Yunnan Bureau of Geology and Mineral Resources, 1990): I1, Tengchong –Baoshan subregion of Yunnan–Tibet region; II1, Zhongdian subregion of Tethys region; II2, Lanping–Simao subregion of Tethys region; III1, Central Yunnan subregion of Yangtze region; IV1, Southeast Yunnan subregion of South China region. Number in legend shows the species at this locality. 2* indicate two fossil species.
Figure 25 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 25. Comparison of the species of Anularya gen. nov. from four lakes with respect to parameters H and W/H.
Figure 22 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 22. Shells of Tchangmargarya multilabiata sp. nov. from Lake Changhu: A, holotype, male individual, FG594250; B, paratype, male individual, CH 1, 59.2 mm; C, paratype, female individual, CH 2, 52.8 mm; D, paratype, CH 7, 52.4 mm; E, paratype, CH 35, 50.77 mm; F, paratype, five keels variety with totally purple calcareous layers, CHX 1, 53.3 mm; G, inner lip; H, juvenile shell with band, 15.4 mm (provided by Hao Yang).
Figure 19 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 19. Shells of Tchangmargarya yangtsunghaiensis: A, Lake Yangzonghai, YZHHY 14, 50.2 mm; B, Lake Yangzonghai, YZHHY 10, 54.6 mm; C, Lake Yangzonghai, four keels variety, YZHHY 29, 48.4 mm; D, subfossil from hill of Wanfu Temple, YZHWFS 5, 49.1 mm; E, holotype of Margarya yangtsunghaiensis, FG00001.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
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