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1,088 results for “Bivalves”
Files for phylogenetics, structure, and migration rate analyses for the bivalve Aequiyoldia eightsii
<p><span><span><span>The Antarctic Circumpolar Current (ACC) dominates the open-ocean circulation of the Southern Ocean, and both isolates and connects the Southern Ocean biodiversity. However, the impact on biological processes of other Southern Ocean currents is less clear. Adjacent to the West Antarctic Peninsula (WAP), the ACC flows offshore in a northeastward direction, whereas the Antarctic Peninsula Coastal Current (APCC) follows a complex circulation pattern along the coast, with topographically-influenced deflections depending on the area. Using genomic data, we estimated genetic structure and migration rates between populations of the benthic bivalve </span><i><span>Aequiyoldia eightsii</span></i><span> from the shallows of southern South America and the WAP to test the role of the ACC and the APCC in its dispersal. We found strong genetic structure across the ACC (between southern South America and Antarctica) and moderate structure between populations of the West Antarctic Peninsula. Migration rates along the WAP were consistent with the APCC being important for species dispersal. Along with supporting current knowledge about ocean circulation models at the WAP, migration from the tip of the Antarctic Peninsula to the Bellingshausen Sea highlights the complexities of Southern Ocean circulation. This study provides novel biological evidence of a role of the APCC as a driver of species dispersal and highlights the power of genomic data for aiding in the understanding of complex oceanographic processes.</span></span></span></p>
Gene family amplification facilitates adaptation in freshwater Unionid bivalve Megalonaias nervosa
<p>As organisms are faced with intense rapidly changing selective pressures, new genetic material is required to facilitate adaptation. Among sources of genetic novelty, gene duplications and transposable elements (TEs) offer new genes or new regulatory patterns that can facilitate evolutionary change. With advances in genome sequencing it is possible to gain a broader view of how gene family proliferation and TE content evolve in non-model species when populations become threatened. Freshwater bivalves (Unionidae) currently face severe anthropogenic challenges. Over 70% of species in the United States are threatened, endangered or extinct due to pollution, damming of waterways, and overfishing. We have created a reference genome for M. nervosa to determine how genome content has evolved in the face of these widespread environmental challenges. We observe a burst of recent transposable element proliferation causing a 382 Mb expansion in genome content. Gene family expansion is common, with a duplication rate of 1.16 x 10^-8 per gene per generation. Cytochrome P450, ABC transporters, Hsp70 genes, von Willebrand proteins, chitin metabolism genes, mitochondria eating proteins, and opsin gene families have experienced significantly greater amplification and show signatures of selection. We use evolutionary theory to assess the relative contribution of SNPs and duplications in evolutionary change. Estimates suggest that gene family evolution may offer an exceptional substrate of genetic variation in M. nervosa, with Psgv=0.185 compared with Psgv=0.067 for single nucleotide changes. Hence, we suggest that gene family evolution is a source of "hopeful monsters" within the genome that facilitate adaptation.</p>
Data for: The Clam Before the Storm: A Meta Analysis Showing the Effect of Combined Climate Change Stressors on Bivalves
<p>These data were used to conduct a meta-analysis (as descirbed in the pre-print; The Clam Before the Storm: A Meta Analysis Showing the Effect of Combined Climate Change Stressors on Bivalves). These data can be used to reproduce our analysis.</p>
Data from: Comparative transcriptomics revealed parallel evolution and innovation of photosymbiosis molecular mechanisms in a marine bivalve
<p>Photosymbioses between heterotrophic hosts and autotrophic symbionts are evolutionarily prevalent and ecologically significant. However, molecular mechanisms behind such symbioses remain less elucidated, which hinders our understanding of their origin and adaptive evolution. This study compared gene expression patterns in a photosymbiotic bivalve (<em>Fragum sueziense</em>) and a closely related non-symbiotic species (<em>Trigoniocardia granifera</em>) under different light conditions to detect potential molecular pathways involved in mollusk photosymbiosis. We discovered that the presence of algal symbionts greatly impacted host gene expression in symbiont-containing tissues. We found that the host immune functions were suppressed under normal light compared to those in the dark. In addition, we found that cilia in the symbiont-containing tissues play important roles in symbiont regulation or photoreception. Interestingly, many potential photosymbiosis genes could not be annotated or do not exhibit orthologs in <em>T. granifera</em> transcriptomes, indicating unique molecular functions in photosymbiotic bivalves. Overall, we found both novel and known molecular mechanisms involved in animal-algal photosymbiosis within bivalves. Given that many of the molecular pathways are shared among distantly related host lineages, such as mollusks and cnidarians, it indicates that parallel and/or convergent evolution is instrumental in driving host-symbiont adaptations in diverse organisms.</p>
Data from: Physiological effects of interacting native and invasive bivalves under thermal stress
<p>Across many ecosystems in North America and Europe, native freshwater bivalves (Order Unionida) are threatened by fouling and competition for food by the invasive zebra mussel <em>Dreissena polymorpha</em>. In light of climate change, knowledge on the influence of water temperature on these competitive effects is important, yet poorly understood. This study examines the physiological impact of the interaction between <em>D. polymorpha</em> and the native European unionid <em>Anodonta cygnea</em> over a 28-day period in response to water temperatures of 12, 19, and 25 °C by comparing their glycogen, glucose, lipid, and protein concentrations. The laboratory experiment comprised three treatments: (1) fouling of <em>A. cygnea</em> by <em>D. polymorpha</em>, (2) both species present but not fouling; and (3) a control in which <em>A. cygnea</em> and <em>D.</em> <em>polymorpha</em> were placed separately. Increased water temperatures caused physiological stress in <em>D. polymorpha</em> as evident from reduced glycogen, glucose, lipid, and protein concentrations. <em>Dreissena polymorpha</em> benefited from fouling of unionids, as individuals that fouled <em>A. cygnea</em> tended to have increased glycogen, glucose, lipid and protein concentrations. Competitive effects of <em>D. polymorpha</em> over the unionid bivalve species, however, were not intensified by elevated temperatures. Glochidia release, lower infestation intensity, and physiological stress of <em>Dreissena </em>at higher temperatures were likely confounding factors. The results of this study suggest that understanding the physiological consequences of species interactions at changing temperatures can be an important tool to assess future climate change impacts on freshwater bivalves and aquatic community structures.</p>
Nothoscordum bivalve (Liliaceae) - inflorescence - frontal view of flower
Image of Nothoscordum bivalve (Liliaceae) - inflorescence - frontal view of flower
Spatiotemporal changes in riverine input into the Eocene North Sea revealed by strontium isotope and barium analysis of bivalve shells
<p>Extended data and calculations belonging to this study are summarized in the supplementary material. These supplements contain the following supplementary data files: </p> <ul> <li>Supplementary material: supplementary Figure S1</li> <li>Supplementary data 1: Element and isotope data for each individual shell</li> <li>Supplementary data 2: <sup>87</sup>Sr/<sup>86</sup>Sr salinity variability reconstruction</li> <li>Supplementary data 3: Stratigraphy for sampling locations</li> <li>Supplementary data 4: <sup>87</sup>Sr/<sup>86</sup>Sr data for recent oyster shells</li> <li>Supplementary data 5: Extended strontium isotope data</li> </ul>
Bivalve facilitation mediates seagrass recovery from physical disturbance in a temperate estuary
<p>This dataset describes two experiments done in seagrass beds in Back Sound, North Carolina. Experiment 1 was located in a large<i> </i>contiguous shallow seagrass bed near Cape Lookout, NC<i> </i>(34.668121, -76.509455) and Experiment 2 was located in the Rachel Carson Estuarine Reserve, Beaufort, NC (34.698799, -76.595439). Experiment 1 was a clam-addition/control experiment, and 2018/2019 summer growth rates, 2018/2019 summer biomass cores, and 2018/2019 epiphytic load on <i>Zostera marina </i>and <em>Halodule wrightii </em>were sampled. Experiment 2 was a two-factor experiment looking at clam-addition and excavation and 2019 summer growth rates, 2019/2020 summer biomass cores, and 2019/2020 recolonization and percent cover were sampled. To document the spatial characteristics of the experimental areas, we mapped the extent of the contiguous seagrass bed and the coordinates of the experimental plots and subplots with a Trimble R10 Integrated GNSS system in May 2018, June 2018, and July 2019 for Experiment 1 and April 2019 and July 2019 for Experiment 2 in the NAD83 coordinate system.</p>
Specimen alignment with limited point-based homology: 3D morphometrics of disparate bivalve shells (Mollusca: Bivalvia)
<p>Supplemental data and code for Edie, Collins, and Jablonski, Specimen alignment with limited point-based homology: 3D morphometrics of disparate bivalve shells (Mollusca: Bivalvia).</p>
BiValve Fossil
BiValve fossil from Lilydale, MN. Scanned on a 3-Shape® dental scanner. original specimen is 31 mm widest dimension. Source: Objaverse 1.0 / Sketchfab
Fossil Bivalve (Plagiostoma sp)
**Ejemplar:** *Plagiostoma * sp. **Edad:** 182-174 Ma. Toarciense (Jurásico Inferior) **Localidad:** Kilsby (Inglaterra) **Descripción:** valva preservada en calcita junto con el molde interno **Dimensión ejemplar:** 12 cm. longitud máxima **Sigla museo, colección y entidad:** MGUV , colección bivalvos 3D, Museo de la Universidad de Valencia de Historia Natural **Técnica digitalización / modelo:** escaneado superficial, escáner 3D Einscan Pro **Software empleado:** einscan Pro v3.1.0.2 **Parámetros software:** modo fijo con plataforma giratoria, 8 escaneos, calidad media **Archivo 3D: ** Ply 175 Mb , textura JPG 627 kb **Autor digitalización:** Carlos Martinez Perez **Cita ejemplar:** modelo 3D Museo Universitat de València de Historia Natural Source: Objaverse 1.0 / Sketchfab
Fossil Bivalve (Gervillia sp)
**Ejemplar:**Gervillia sp **Edad:** 242-237 Ma. Ladiniense (Triásico Medio) **Localidad:** Henarejos (Cuenca, España) **Descripción:** ejemplar completo con valvas en conexión anatómica y preservadas en calcita sobre matris margo-calcárea **Dimensión ejemplar:** 9 cm. de longitud. **Sigla museo, colección y entidad:** MGUV-36170, colección de bivalvos del Museo de la Universitat de Valencia de Historia natural. Donación de Sonia Ros **Técnica digitalización / modelo:** fotogrametría con cámara sony DSC HX60 **Software empleado:** photoscan **Parámetros software:** calida alta de nubes de puntos y malla. **Archivo 3D:** obj 184 Mb y textura jpg 2´44 Mb **Autor digitalización:** Jose A. Villena **Cita ejemplar:** modelo 3D colección bivalvos colección de bivalvos del Museo de la Universitat de Valencia de Historia natural. **Colección de referencia del Triásico catalogada y estudiada por Ana Marquez Aliaga** Source: Objaverse 1.0 / Sketchfab
Рис. 8. Irus ishibashianus Kuroda et Habe, 1952. Fig. 8. Irus ishibashianus Kuroda et Habe, 1952. in Bivalve mollusks of the intertidal zone of the Far Eastern seas of Russia
Рис. 8. Irus ishibashianus Kuroda et Habe, 1952. Fig. 8. Irus ishibashianus Kuroda et Habe, 1952.
Рис. 7. Megangulus luteus (Wood, 1828). Fig. 7. Megangulus luteus (Wood, 1828). in Bivalve mollusks of the intertidal zone of the Far Eastern seas of Russia
Рис. 7. Megangulus luteus (Wood, 1828). Fig. 7. Megangulus luteus (Wood, 1828).
Рис. 6. Macoma sp. Fig. 6. Macoma sp. in Bivalve mollusks of the intertidal zone of the Far Eastern seas of Russia
Рис. 6. Macoma sp. Fig. 6. Macoma sp.
Рис. 9. Liocyma fluctuosum (A.A. Gould, 1841). Fig. 9. Liocyma fluctuosum (A.A. Gould, 1841). in Bivalve mollusks of the intertidal zone of the Far Eastern seas of Russia
Рис. 9. Liocyma fluctuosum (A.A. Gould, 1841). Fig. 9. Liocyma fluctuosum (A.A. Gould, 1841).
Рис. 1. Карта-схема сбора материала. Fig. 1. A schematic map of the region studied. in On the species composition of marine bivalves of the Sikhote-Alin Reserve (northern Primorye, Japan/East Sea)
Рис. 1. Карта-схема сбора материала. Fig. 1. A schematic map of the region studied.
Рис. 18. Распредение биомассы Hiatella atctica на литорали дальневоcточных морей России. in Bivalve mollusks of the intertidal zone of the Far Eastern seas of Russia
Рис. 18. Распредение биомассы Hiatella atctica на литорали дальневоcточных морей России.
Рис. 15. Распредение биомассы Mya japonica на литорали дальневоcточных морей России. in Bivalve mollusks of the intertidal zone of the Far Eastern seas of Russia
Рис. 15. Распредение биомассы Mya japonica на литорали дальневоcточных морей России.
Рис. 14. Mya (Arenomya) japonica Jay, 1857. Fig. 14. Mya (Arenomya) japonica Jay, 1857. in Bivalve mollusks of the intertidal zone of the Far Eastern seas of Russia
Рис. 14. Mya (Arenomya) japonica Jay, 1857. Fig. 14. Mya (Arenomya) japonica Jay, 1857.
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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)
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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.