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670 results for “Molluscs”
Data from: Seascape genomics reveals adaptive divergence in a connected and commercially important mollusc, the greenlip abalone (Haliotis laevigata), along a longitudinal environmental gradient
Populations of broadcast spawning marine organisms often have large sizes and are exposed to reduced genetic drift. Under such scenarios, strong selection associated with spatial environmental heterogeneity is expected to drive localized adaptive divergence, even in the face of connectivity. We tested this hypothesis using a seascape genomics approach in the commercially important greenlip abalone (Haliotis laevigata). We assessed how its population structure has been influenced by environmental heterogeneity along a zonal coastal boundary in southern Australia linked by strong oceanographic connectivity. Our datasets include 9,109 filtered SNPs for 371 abalones from 13 localities and environmental mapping across ~800 km. Genotype-environment association analyses and outlier tests defined 8,786 putatively neutral and 323 candidate adaptive loci. From a neutral perspective, the species is better represented by a metapopulation with very low differentiation (global FST=0.0081) and weak isolation by distance following a stepping stone model. For the candidate adaptive loci, however, model-based and model-free approaches indicated five divergent population clusters. After controlling for spatial distance, the distribution of putatively adaptive variation was strongly correlated to selection linked to minimum sea surface temperature and oxygen concentration. Around 80 candidates were annotated to genes with functions related to high temperature and/or low oxygen tolerance, including genes that influence the resilience of abalone species found in other biogeographic regions. Our study includes a documented example about the uptake of genomic information in fisheries management and supports the hypothesis of adaptive divergence due to coastal environmental heterogeneity in a connected metapopulation of a broadcast spawner.
Data from: Contrasting patterns of population connectivity between regions in a commercially important mollusc Haliotis rubra: integrating population genetics, genomics and marine LiDAR data
Estimating contemporary genetic structure and population connectivity in marine species is challenging, often compromised by genetic markers that lack adequate sensitivity, and unstructured sampling regimes. We show how these limitations can be overcome via the integration of modern genotyping methods and sampling designs guided by LiDAR and SONAR data sets. Here we explore patterns of gene flow and local genetic structure in a commercially harvested abalone species (Haliotis rubra) from southeastern Australia, where the viability of fishing stocks is believed to be dictated by recruitment from local sources. Using a panel of microsatellite and genomewide SNP markers, we compare allele frequencies across a replicated hierarchical sampling area guided by bathymetric LiDAR imagery. Results indicate high levels of gene flow and no significant genetic structure within or between benthic reef habitats across 1400 km of coastline. These findings differ to those reported for other regions of the fishery indicating that larval supply is likely to be spatially variable, with implications for management and long-term recovery from stock depletion. The study highlights the utility of suitably designed genetic markers and spatially informed sampling strategies for gaining insights into recruitment patterns in benthic marine species, assisting in conservation planning and sustainable management of fisheries.
Data from: Ontogeny, morphology and taxonomy of the soft-bodied Cambrian 'mollusc' Wiwaxia
The soft-bodied Cambrian organism Wiwaxia poses a taxonomic conundrum. Its imbricated dorsal scleritome suggests a relationship with the polychaete annelid worms, whereas its mouthparts and naked ventral surface invite comparison with the molluscan radula and foot. 476 new and existing specimens from the 505-Myr-old Burgess Shale cast fresh light on Wiwaxia's sclerites and scleritome. My observations illuminate the diversity within the genus and demonstrate that Wiwaxia did not undergo discrete moult stages; rather, its scleritome developed gradually, with piecewise addition and replacement of individually secreted sclerites. I recognize a digestive tract and creeping foot in Wiwaxia, solidifying its relationship with the contemporary Odontogriphus. Similarities between the scleritomes of Wiwaxia, halkieriids, Polyplacophora and Aplacophora hint that the taxa are related. A molluscan affinity is robustly established, and Wiwaxia provides a good fossil proxy for the ancestral aculiferan – and perhaps molluscan – body plan.
Data from: Effects of brooding and broadcasting reproductive modes on the population genetic structure of two Antarctic gastropod molluscs
Life-history characteristics exert a profound influence upon the population structure of many marine organisms. However, relatively few genetic studies have compared direct with indirect-developing species in the same ecosystem or geographic region, and none to our knowledge within an Antarctic setting. To address this issue we have collected novel Amplified Fragment Length Polymorphism (AFLP) data from the direct-developing top shell Margarella antarctica to form a comparison with previously published data for the broadcast-spawning Antarctic limpet Nacella concinna. We scored 270 loci in 240 M. antarctica individuals sampled from five populations spanning the full length of the Antarctic Peninsula. Profound differences were identified in the strength and pattern of population structure between the two species, consistent with gene flow being highly restricted in M. antarctica relative to N. concinna.
FIGURE 1 in The youngest rostroconch mollusc from North America, Minycardita capitanensis n. sp.
FIGURE 1. Holotype of Minycardita capitanensis n. sp., GUMO 15309. Images A–F were taken through the dissecting microscope, G–J via SEM. A, left-lateral view. B, right-lateral view. C, dorsal view. D, ventral view. E, anterior view. F, oblique-ventral view. G, posterior view. H, anterior view. I, dorsal view. J, postero-dorsal view. Scale bars 1 mm; scale bar for A–D is the same, in the middle of these four images.
FIGURE 9. A in Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam
FIGURE 9. A. Ercolania gopalai (5 mm). B. Philine sp. (70 mm). C. Platevindex sp. (55 mm). D. Peronia sp. (40 mm). E. Onchidiidae gen. sp. 2 (35 mm). F. Onchidiidae gen. sp. 1 (35 mm). G. Aggregation of onchidiids. H. Onchidiidae gen. sp. 3 (35 mm). I. Onchidium sp. (35 mm).
FIGURE 5. A–B in Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam
FIGURE 5. A–B. Pirenella incisa (22 mm). C–D. Pirenella incisa (25 mm). E–F. Pirenella microptera (22 mm). G–H. Pirenella cingulata (22 mm). I–J. Pirenella cingulata (16 mm). K–L. Cerithidea moerchii (31 mm). M–N. Cerithidea moerchii (27 mm). O. Cerithidea quoyii (43 mm). P. Cerithidea quoyii (41 mm). Q–R. Cerithidea quoyii (35 mm). S–T. Terebralia sulcata (43 mm).
FIGURE 8. A–B in Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam
FIGURE 8. A–B. Drupella margariticola (21 mm). C–D. Tenguella musiva (22 mm). E–F. Semiricinula muricoides (22 mm). G–H. Lataxiena blosvillei (44 mm). I–J. Amathinidae gen. sp. (5 mm). K–L. Otopleura sp. (10 mm). M–N. Otopleura auriscati (10 mm). O–P. Syrnola sp. (8 mm). Q–R. Cassidula aurisfelis (25 mm). S–T. Cassidula nucleus (22 mm). U–V. Melampus granifer (6 mm). W–X. Laemodonta siamensis (7 mm). Y–Z. Melampus cf. adamsianus (11 mm).
FIGURE 7. A–B in Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam
FIGURE 7. A–B. Notocochlis cf. gualteriana (10 mm). C–D. Notocochlis cf. gualteriana (8 mm). E–F. Polinices mammilla (38 mm). G–H. Assiminea brevicula (6 mm). I–K. Stenothyra sp. (4 mm). L–M. Monoplex pilearis (59 mm). N–O. Gutturnium muricinum (48 mm). P–Q. Epitonium sp. (4 mm). R–S. Pictocolumbella ocellata (6 mm). T–U. Nassarius olivaceus (27 mm). V–W. Monoplex vespaceus (36 mm).
FIGURE 6. A–B in Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam
FIGURE 6. A–B. Monetaria moneta (26 mm). C–D. Monetaria annulus (25 mm). E–F. Sermyla riqueti (10 mm). G–H. Sermyla riqueti (7 mm). I–J. Littoraria lutea (36 mm). K–L. Littoraria lutea (23 mm). M–N. Littoraria lutea (29 mm). O–P. Littoraria ardouiniana (16 mm). Q–R. Littoraria scabra (36 mm). S–T. Littoraria carinifera (18 mm). U–V. Littoraria pallescens (24mm). W–X. Littoraria pallescens (12 mm). Y–Z. Littoraria ardouiniana (14 mm). AA–AB. Littoraria intermedia (14 mm).
FIGURE 3. A–B in Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam
FIGURE 3. A–B. Nerita albicilla (14 mm). C–D. Nerita histrio (18 mm). E–F. Nerita planospira (26 mm). G–H. Nerita undata (21 mm). I–J. Neripteron siquijorense (4 mm). K–L. Neripteron subauriculatum (10 mm). M–N. Clithon oualaniense (7 mm). O–P. Clithon faba (10 mm). Q–R. Clithon faba (6 mm).
FIGURE 4. A–B in Cheсklist of gastropod molluscs in mangroves of Khanh Hoa province, Vietnam
FIGURE 4. A–B. Clypeomorus batillariaeformis (19 mm). C–D. Clypeomorus bifasciata (12 mm). E–F. Clypeomorus pellucida (22 mm). G–H. Cerithium coralium (25 mm). I–J. Cerithium traillii (40 mm). K–L. Rhinoclavis vertagus (53 mm). M–N. Batillaria sp. (27 mm). O. Batillaria sp. (30 mm). P. Batillaria sp. (29 mm). Q–R. Planaxis sulcatus (22 mm).
FIG. 10 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 10. (a) Taringa luteola Chag96 /69: ventral view of head. (b) Chromodoris cf. leopardus Chag96/34: ventral view of head.
FIG. 9 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 9. SEM of radular teeth, Taringa luteola Chag96/69, scales 10 mm. (A) First few laterals. (B) Teeth in mid-row. (C) Last four marginals.
FIG. 3 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 3. Aplysia cf. parvula Chag96 /18. (a) Extruded penis. (b) Radular teeth drawn with camera lucida.
FIG. 13 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 13. (a) Chromodoris tennentana Chag96/61: 18 mm. (b) Chromodoris cf. leopardus Chag96/78. (c) Glossodoris cincta Chag96/59: 27 mm. (d) Glossodoris symmetricus Chag96/50: 26 mm. (e) Hypselodoris maculosa Chag96 /60: 11 mm. (f) Hypselodoris nigrostriata Chag96/58: approx. 25 mm.
FIG. 17 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 17. (a) Phyllidiella rosans Chag96/23: ventral view of oral tentacles. (b) Phyllidiella striata Chag96/5: ventral view of oral tentacles.
FIG. 12 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 12. SEM of radular teeth. (A, B) Chromodoris quadricolor Chag96/87, scales 20 mm. (C, D) Chromodoris cf. leopardus Chag96 /34, scales 5 10 mm.
FIG. 4 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 4. (a) Nembrotha lineolata Chag96/63: 45 mm. (b) Nembrotha cf. lineolata Chag96 /95: 14 mm. (c) Aldisa pikokai Chag96/90: 18 mm. (d) Hoplodoris estrelyado Chag96 /89: 15 mm. (e) Taringa luteola Chag96/69: 25 mm. (f) Chromodoris cf. leopardu s Chag96 /34: 34 mm. (g) Dendrodoris tuberculosa Chag96 /7: 140 mm. (h) Dermatobranchus albus Chag96/45: 12 mm.
FIG. 11 in Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean
FIG. 11. (a) Halgerda tesselata Chag96 /30b: 25 mm. (b) Halgerda willeyi Chag96/77b: 12 mm. (c) Cadlinella ornatissima Chag96 /91: 14 mm. (d) Chromodoris gleniei Chag96 /73: 42 mm. (e, f) Chromodoris quadricolor Chag96/52b and Chag96/87: 40 mm.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.