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139 results for “Body size evolution”
Data from: Evolution of size-dependent intraspecific competition predicts body size scaling of metabolic rate
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Data from: Classification tree methods provide a multifactorial approach to predicting insular body size evolution in rodents
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Data from: Body size affects the evolution of hidden colour signals in moths
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Data from: The impact of phylogenetic dating method on interpreting trait evolution: a case study of Cretaceous–Palaeogene eutherian body-size evolution
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Data from: TP53 copy number expansion is associated with the evolution of increased body size and an enhanced DNA damage response in elephants
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Data from: The evolution of male-biased sexual size dimorphism is associated with increased body size plasticity in males
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Data from: Time-limited environments affect the evolution of egg - body size allometry
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Data from: Impacts of genetic correlation on the independent evolution of body mass and skeletal size in mammals
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Data from: Synergism and antagonism of proximate mechanisms enable and constrain the response to simultaneous selection on body size and development time: an empirical test using experimental evolution
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Data from: Large neotheropods from the Upper Triassic of North America and the early evolution of large theropod body sizes
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Data from: The evolution of fecundity is associated with female body size but not female-biased sexual size dimorphism among frogs
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Data from: Rethinking the effects of body size on the study of brain size evolution
Body size correlates with most structural and functional components of an organism's phenotype – brain size being a prime example of allometric scaling with animal size. Therefore, comparative studies of brain evolution in vertebrates rely on controlling for the scaling effects of body size variation on brain size variation by calculating brain weight/body weight ratios. Differences in the brain size-body size relationship between taxa are usually interpreted as differences in selection acting on the brain or its components, while selection pressures acting on body size, which are among the most prevalent in nature, are rarely acknowledged, leading to conflicting and confusing conclusions. We address these problems by comparing brain-body relationships from across >1,000 species of birds and non-avian reptiles. Relative brain size in birds is often assumed to be 10 times larger than in reptiles of similar body size. We examine how differences in the specific gravity of body tissues and in body design (e.g., presence/absence of a tail or a dense shell) between these two groups can affect estimates of relative brain size. Using phylogenetic comparative analyses, we show that the gap in relative brain size between birds and reptiles has been grossly exaggerated. Our results highlight the need to take into account differences between taxa arising from selection pressures affecting body size and design, and call into question the widespread misconception that reptile brains are small and incapable of supporting sophisticated behavior and cognition.
Data from: Early bursts of body size and shape evolution are rare in comparative data
George Gaylord Simpson famously postulated that much of life's diversity originated as adaptive radiations—more or less simultaneous divergences of numerous lines from a single ancestral adaptive type. However, identifying adaptive radiations has proven difficult due to a lack of broad-scale comparative datasets. Here, we use phylogenetic comparative data on body size and shape in a diversity of animal clades to test a key model of adaptive radiation, in which initially rapid morphological evolution is followed by relative stasis. We compared the fit of this model to both single selective peak and random walk models. We found little support for the early-burst model of adaptive radiation, whereas both other models, particularly that of selective peaks, were commonly supported. In addition, we found that the net rate of morphological evolution varied inversely with clade age. The youngest clades appear to evolve most rapidly because long-term change typically does not attain the amount of divergence predicted from rates measured over short time scales. Across our entire analysis, the dominant pattern was one of constraints shaping evolution continually through time rather than rapid evolution followed by stasis. We suggest that the classical model of adaptive radiation, where morphological evolution is initially rapid and slows through time, may be rare in comparative data.
Data from: Early bursts of body size and shape evolution are rare in comparative data
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Data from: Rethinking the effects of body size on the study of brain size evolution
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F in A new gigantic earthworm of the genus Metaphire Sims and Easton (Megascolecidae: Oligochaeta) from Taiwan with reference to evolutional trends in body sizes and segment numbers of the Pheretima genus-group
F. 3. Segment number frequency distribution of caecate (Amynthas, Metaphire, Pheretima) and acaecate (Archipheretima, Metapheretima, Polypheretima, Planapheretima) earthworms from Japan, Korea, China, Taiwan and South-East Asia (total number of species in parenthesis following average±standard deviation).
Figure 1 in Body size estimation and evolution in metriorhynchid crocodylomorphs: implications for species diversification and niche partitioning
Figure 1. Comparative view of four fossil crocodylomorphs, showing the skeletal variation of this clade: A, Pristichampsus geiseltalensis GM 8001, an unguligrade terrestrial eusuchian; B, Alligatorellus beaumonti BSPG 1937-I-26, a small-bodied semi-aquatic atoposaurid; C, Crocodilaemus robustus NHM 40344 (cast of holotype), a heavily armoured semi-aquatic pholidosaurid; and D, Cricosaurus suevicus SMNS 9808, a pelagic metriorhynchid. Note the large size of the head of Cricosaurus relative to its body length, its hypocercal tail, reduction of pectoral and pelvic girdles, hydrofoil-like forelimbs, and lack of osteoderms. Scale bars = 100 mm.
RNA-Seq provides insight to the body size evolution from comparative analyses of three Asia Sisoridae catfish
GEO Series GSE108597. Glyptothorax macromaculatus; Bagarius yarrelli; Oreoglanis setiger. 27 samples. Type: Expression profiling by high throughput sequencing.
Supporting data for: The multi-peak adaptive landscape of crocodylomorph body size evolution
<p>Data supporting the manuscript "The multi-peak adaptive landscape of crocodylomorph body size evolution", currently in review at BMC Evolutionary Biology. The zip folder contains 3 documents (Additional files 1, 2, and 3) and 4 subfolders (Additional files 4, 5, 6, and 7):</p> <ul> <li>Additional files 1: Supplementary methods and results, including information on (1) total length estimation from cranial measurements, (2) supertree construction, (3) time bins used for time series correlations and disparity calculation, and (4) regression results tables of all correlation analyses performed.</li> <li>Additional files 2: Datasets with information on crocodylomorph body size (cranial measurements), palaeolatitude, specimens and lifestyle.</li> <li>Additional files 3: AICc scores of all models fitted in our macroevolutionary analyses.</li> <li>Additional files 4: Folder containing all plots of SURFACE model fits.</li> <li>Additional files 5: Folder containing cross plotting of all SURFACE model fits, using distinct time-scaling methods.</li> <li>Additional files 6: Folder containing alternative crocodylomorph trees and FAD (First Appearance Datum) and LAD (Last Appearance Datum) of all species used in our analyses.</li> <li>Additional files 7: Folder containing R functions and data for running an example script of our model-fitting analyses.</li> </ul>
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Allen Brain Atlas
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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.