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84 results for “Metamorphism”
Data from: Fitness consequences of larval traits persist across the metamorphic boundary
Metamorphosis is thought to provide an adaptive decoupling between traits specialised for each life-history stage in species with complex life cycles. However, an increasing number of studies are finding that larval traits can carry-over to influence post-metamorphic performance, suggesting that these life-history stages may not be free to evolve independently of each other. We used a phenotypic selection framework to compare the relative and interactive effects of larval size, time to hatching, and time to settlement on post-metamorphic survival and growth in a marine invertebrate, Styela plicata. Time to hatching was the only larval trait found to be under directional selection, individuals that took more time to hatch into larvae survived better after metamorphosis but grew more slowly. Non-linear selection was found to act on multivariate trait combinations, once again acting in opposite directions for selection acting via survival and growth. Individuals with above average values of larval traits were the most likely to survive, but surviving individuals with intermediate larval traits grew to the largest size. These results demonstrate that larval traits can have multiple, complex fitness consequences that persist across the metamorphic boundary; and thus post-metamorphic selection pressures may constrain the evolution of larval traits.
Data from: Early post-metamorphic, Carboniferous blastoid reveals the evolution and development of the digestive system in early echinoderms
Inferring the development of the earliest echinoderms is critical to uncovering the evolutionary assembly of the phylum-level body plan but has long proven problematic because early ontogenetic stages are rarely preserved as fossils. Here, we use synchrotron tomography to describe a new early post-metamorphic blastoid echinoderm from the Carboniferous (approx. 323 Ma) of China. The resulting three-dimensional reconstruction reveals a U-shaped tubular structure in the fossil interior, which is interpreted as the digestive tract. Comparisons with the developing gut of modern crinoids demonstrate that crinoids are an imperfect analogue for many extinct groups. Furthermore, consideration of our findings in a phylogenetic context allows us to reconstruct the evolution and development of the digestive system in echinoderms more broadly; there was a transition from a straight to a simple curved gut early in the phylum's evolution, but additional loops and coils of the digestive tract (as seen in crinoids) were not acquired until much later.
Deep carbon cycling in subduction zones: 1. Coupled thermo-metamorphic-dissolution model in open versus closed system
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Metamorphic densification can account for the missing felsic crust of the Greater Indian continent
<p>Metamorphic densification can account for the missing felsic crust of the Greater Indian continent</p>
Single-stage synchronous India-Asia collision model revealed by Himalayan high-pressure metamorphic rocks
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Single-stage synchronous India-Asia collision model revealed by Himalayan high-pressure metamorphic rocks
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Data from: Frictional stability of metamorphic epidote in granitoid faults under hydrothermal conditions and implications for injection-induced seismicity
<p>The effect of low-grade metamorphic epidote on fault stability in granitoids at shallow depth is not well understood. We present structured laboratory observations of epidote and simulated Pohang granodiorite (an EGS site) gouges and mixtures to evaluate their frictional responses. The experiments were performed on powdered rock gouges at a constant confining pressure of 110 <i>MPa</i>, pore fluid pressures of 42 and 63 <i>MPa</i>, temperatures of 100-250℃ and epidote percentages in the range of 0-100 <i>vol</i>.%. Results show that the simulated Pohang granodiorite gouge is frictionally strong (friction coefficient of ~0.71) but exhibits a transition from velocity-strengthening to velocity-weakening behavior at <i>in-situ</i> temperatures >150℃. Epidote gouge displays similar frictional strength to the simulated granodiorite gouge but a stronger velocity-weakening response at 150℃. Increasing the epidote content in the homogeneously mixed gouges maintains the high frictional strength but increases velocity-weakening response approximately proportionately with epidote content. Modes of epidote precipitation likely control patch dimension and this in turn potentially changes the response of the 50:50 epidote-granodiorite mixed gouges in different geometric configurations. However, 50:50 mixtures that are variously homogeneously mixed, encapsulated and checkerboarded in their architectures are insensitive to their various geometries – all reflect the high frictional strength and strong velocity-weakening response of 100:0 pure epidote. This suggests that small volume percentages of epidote present as thin coatings on fractures and faults can impart velocity-weakening behavior, independent of individual patch size and can thereby support the potential seismic reactivation of faults. Considering the frictional and stability properties of epidote at conditions typical of shallow depths, the presence of low-grade metamorphism exerts a potentially important control on fault stability in granitoids with relevance as a marker mineral for susceptibility to injection-induced seismicity.</p>
Datasets of mineral composition and geochronological result of Barrovian metamorphic sequence rocks in the Ailao Shan massif
<p>This file includes the supporting information and supplementary date of the manuscript titled“Thermal and physical properties of Barrovian metamorphic sequence rocks in the Ailao Shan-Red River shear zone, and implications for crustal channel flow”</p>
The potential for low-grade metamorphism to facilitate fault instability in a geothermal reservoir
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Data from: Fitness consequences of larval traits persist across the metamorphic boundary
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Data from: Frictional stability of metamorphic epidote in granitoid faults under hydrothermal conditions and implications for injection-induced seismicity
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Data from: Post-metamorphic allometry in the earliest acrotretoid brachiopods from the lower Cambrian (Series 2) of South China, and its implications
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Data from: Early post-metamorphic, Carboniferous blastoid reveals the evolution and development of the digestive system in early echinoderms
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DNA methylation dynamics underlie metamorphic gene regulation programs in Xenopus tadpole brain [RNA-seq]
GEO Series GSE140120. Xenopus tropicalis. 12 samples. Type: Expression profiling by high throughput sequencing.
Differential gene expression analysis between pre-metamorphic WT control X. laevis tadpoles and tadpoles with thioridazine-induced brain abnormalities.
GEO Series GSE129234. Xenopus laevis. 12 samples. Type: Expression profiling by high throughput sequencing.
Transcriptome profiling at four stages of turbot development from phylotypic to post-metamorphic stages [RNA-seq]
GEO Series GSE215395. Scophthalmus maximus. 8 samples. Type: Expression profiling by high throughput sequencing.
Chromatin accessibility at four key stages of turbot development, from phylotypic to post-metamorphic stages [ATAC-seq]
GEO Series GSE215396. Scophthalmus maximus. 8 samples. Type: Genome binding/occupancy profiling by high throughput sequencing.
Differential gene expression analysis between pre-metamorphic WT control X. laevis tadpoles and tadpoles with thioridazine-induced craniofacial abnormalities.
GEO Series GSE128772. Xenopus laevis. 12 samples. Type: Expression profiling by high throughput sequencing.
DNA methylation dynamics underlie metamorphic gene regulation programs in Xenopus tadpole brain
GEO Series GSE139267. Xenopus tropicalis. 15 samples. Type: Methylation profiling by high throughput sequencing.
DNA methylation dynamics underlie metamorphic gene regulation programs in Xenopus tadpole brain [ChIP-seq]
GEO Series GSE214697. Xenopus tropicalis. 2 samples. Type: Genome binding/occupancy profiling by high throughput sequencing.
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DANDI Archive for NWB datasets
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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.