Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
119
datasets available to search
ShareScore release 0.9.0
Dataset results
119 results for “color evolution”
Data from: Little white lies: pericarp color provides insights into the origins and evolution of Southeast Asian weedy rice
Weedy rice is a conspecific form of cultivated rice (Oryza sativa L.) that infests rice fields and results in severe crop losses. Weed strains in different world regions appear to have originated multiple times from different domesticated and/or wild rice progenitors. In the case of Malaysian weedy rice, a multiple-origin model has been proposed based on neutral markers and analyses of domestication genes for hull color and seed shattering. Here we examined variation in pericarp (bran) color and its molecular basis to address how this trait evolved in Malaysian weeds and its possible role in weed adaptation. Functional alleles of the Rc gene confer proanthocyanidin pigmentation of the pericarp, a trait found in most wild and weedy Oryzas and associated with seed dormancy; nonfunctional rc alleles were strongly favored during rice domestication, and most cultivated varieties have non-pigmented pericarps. Phenotypic characterizations of 52 Malaysian weeds revealed that most strains are characterized by the pigmented pericarp; however, some weeds have white pericarps, suggesting close relationships to cultivated rice. Phylogenetic analyses indicate that the Rc haplotypes present in Malaysian weeds likely have at least three distinct origins: wild Oryza rufipogon, white-pericarp cultivated rice, and red-pericarp cultivated rice. These diverse origins contribute to high Rc nucleotide diversity in the Malaysian weeds. Comparison of Rc allelic distributions with other rice domestication genes suggests that functional Rc alleles may confer particular fitness benefits in weedy rice populations, for example, by conferring seed dormancy. This may promote functional Rc introgression from local wild Oryza populations.
Data from: Diversification and convergence of aposematic phenotypes: truncated receptors and cellular arrangements mediate rapid evolution of coloration in harlequin poison frogs
Aposematic signals represent one of the classical systems to study evolution and, as such, they have received considerable empirical and theoretical investigation. Despite the extensive literature on aposematic coloration, much uncertainty remains about genetic changes responsible for the repeated evolution of similar signals in multiple lineages. Here, we study the diversification and convergence of coloration among lineages of aposematic harlequin poison frogs (O. histrionica complex). Our results suggest that different background phenotypes, showing different color and/or luminance contrast, have evolved independently at least twice in this group. We suggest that cellular arrangements are behind the striking diversity of color and patterns in this group and propose that differences in dorsal background color may be related to either or both, the presence/absence of xanthophores and the dispersion of melanosomes. Our genetic analyses support a role for the melanocortin receptor MC1R in melanosome aggregation, and we show evidence that two different mutations (∆433 and C432A) are responsible for the darker phenotypes that may display a more detectable, easier to learn, aposematic signal.
Data from: Body size and evolution of motion dazzle coloration in lizards
'Motion dazzle' patterns are a form of defensive coloration suggested to prevent successful capture during motion by causing predators to misjudge the direction or speed of prey movement. Several studies have found results supporting this idea, but little is known about the factors that favour the evolution of these antipredator colorations. A recent experimental study has suggested that the longitudinal striped patterns on body of lizards can redirect attacks to the tail via the motion dazzle effect. Using a virtual predation experiment with humans and a phylogenetic comparative analysis, we show that evolution of longitudinal striped coloration is associated with prey size. Experiments showed that longitudinal stripes located at the anterior reduced lethal attacks (i.e. attacks directed to the anterior and centre), but this benefit was greater for shorter prey. Our comparative analysis revealed a negative association between stripe occurrence and body length, but no association between stripes and body width. Overall, our results suggest that the dazzle effect produced by stripes is more advantageous in shorter lizards than in longer ones, and that the error induced by stripes might be distributed along the axis parallel to the prey trajectory. We discuss reasons why dazzle coloration could be associated with evolution of smaller body size in animals.
Data from: Selection, constraint and the evolution of coloration in African starlings
Colorful plumage plays a prominent role in evolution of birds, influencing communication (sexual/social selection) and crypsis (natural selection). Comparative studies have focused primarily upon these selective pressures, but the mechanisms underlying color production can also be important by constraining the color gamut upon which selection acts. Iridescence is particularly interesting to study the interaction between selection and color-producing mechanisms because a broad range of colors can be produced with a shared template, and innovations to this template further expand this by increasing the parameters interacting to produce colors. We examine the patterns of ornamentation and dichromatism evolution in African starlings, a group remarkably diverse in color production mechanisms, social systems, and ecologies. We find that the presence of iridescence is ancestral to the group, being predominantly lost in females and cooperative breeders, as well as species with less labile templates. Color-producing mechanisms interact and are the main predictors of plumage ornamentation and elaboration, with little influence of selective pressures in their evolution. Dichromatism, however is influenced by social system and the loss of iridescence. Our results show the importance of considering both selection and constraints, and the different roles that they may have, in the evolution of ornamentation and dimorphism.
data from: Color pattern diversity and evolution in Oriental velvet ants (Hymenoptera: Aculeata: Mutillidae)
Open the record for dataset details and reuse information.
Red coloration and the evolution of aposematism in arboreal sciurids
<p>An animal's coloration is associated with a variety of processes and is therefore subjected to multiple selective pressures. Mammals, especially, are typically inconspicuously colored, or cryptic, to avoid detection by predators. Alternatively, an animal may use conspicuous coloration to advertise the presence of an anti-predator defense. The association between signal and defense is called aposematism. Conspicuous black and white coloration has recently been associated with a range of defenses in mammals, including body size (Howell et al. 2021), however red coloration as a potentially aposematic signal has yet to be investigated in mammals. Squirrels, like most mammals, are unable to perceive red for use as a social signal. Here we use a comparative framework to test whether redness could be a means of background matching, serve a thermoregulatory function or be an honest warning of anti-predator defenses across a global distribution of tree squirrels which vary in size from 16g to 2.2kg in this study. We measured redness of the dorsum, the venter and of red accents of study skin specimens of 57 tree squirrel species (N=257) representing 25 genera. We then associated these phenotypic variables with environmental variables using phylogenetic generalized least squares regression. We find that increasing dorsal redness is associated with more humid environments and closed canopies, consistent with prior work that coloration on this body region under selection for crypsis (Sheets and Chavez 2020). However, we find that ventral redness and maximum redness is associated with large body sizes. Our findings suggest that crypsis and aposematism are not mutually exclusive, and that aposematism may be more widespread in mammals than is currently appreciated.<u></u></p>
Data from: Why are animals conspicuously colored? Evolution of sexual versus warning signals in land vertebrates
<p>Conspicuous colors (e.g. red, yellow, blue) have evolved numerous times across animals. But the function of this coloration can differ radically among species. Many species use this coloration as a sexual signal to conspecifics, whereas others use it as a warning signal to predators. Why do different species evolve conspicuous coloration in association with one function as opposed to the other? We address this question in terrestrial vertebrates (tetrapods) using phylogenetic approaches and test whether day-night activities of species help determine these patterns. Using phylogenetic logistic regression, we found that conspicuous, sexually dimorphic coloration is significantly associated with diurnal lineages (e.g. many birds and lizards). By contrast, the evolution of warning signals was significantly associated with large-scale clades that were ancestrally nocturnal (e.g. snakes, amphibians), regardless of the current diel activity of species. Overall, we show that the evolution of conspicuous coloration as warning signals or sexual signals is influenced by the ecology of species, both recently and in the ancient past.</p>
Supplementary material 1 from: Prötzel D, Lambert SM, Andrianasolo GT, Hutter CR, Cobb KA, Scherz MD, Glaw F (2018) The smallest 'true chameleon' from Madagascar: a new, distinctly colored species of the Calumma boettgeri complex (Squamata, Chamaeleonidae). Zoosystematics and Evolution 94(2): 409-423. https://doi.org/10.3897/zse.94.27305
Genetic distances of ND2 : Explanation note: Uncorrected genetic distances for all pairwise comparisons of ND2.
Supplementary material 4 from: Prötzel D, Lambert SM, Andrianasolo GT, Hutter CR, Cobb KA, Scherz MD, Glaw F (2018) The smallest 'true chameleon' from Madagascar: a new, distinctly colored species of the Calumma boettgeri complex (Squamata, Chamaeleonidae). Zoosystematics and Evolution 94(2): 409-423. https://doi.org/10.3897/zse.94.27305
Movie of 3D model of the skull : Explanation note: Movie of micro-CT scan of the skull of the female Calummaroaloko (KU 343168).
Supplementary material 3 from: Prötzel D, Lambert SM, Andrianasolo GT, Hutter CR, Cobb KA, Scherz MD, Glaw F (2018) The smallest 'true chameleon' from Madagascar: a new, distinctly colored species of the Calumma boettgeri complex (Squamata, Chamaeleonidae). Zoosystematics and Evolution 94(2): 409-423. https://doi.org/10.3897/zse.94.27305
Movie of 3D model of the skull : Explanation note: Movie of micro-CT scan of the skull of the male holotype of Calummaroaloko (KU 343178).
Supplementary material 2 from: Prötzel D, Lambert SM, Andrianasolo GT, Hutter CR, Cobb KA, Scherz MD, Glaw F (2018) The smallest 'true chameleon' from Madagascar: a new, distinctly colored species of the Calumma boettgeri complex (Squamata, Chamaeleonidae). Zoosystematics and Evolution 94(2): 409-423. https://doi.org/10.3897/zse.94.27305
Genetic distances of COI : Explanation note: Uncorrected genetic distances for all pairwise comparisons of COI.
Jasmina Wiemann used the eggshell collection at the Yale Peabody Museum of Natural History for her dinosaur eggshell coloration study. Photograph: Courtesy of the Peabody Museum of Natural History, Yale University, New Haven, Connecticut. in The Evolution of Natural History Collections
Jasmina Wiemann used the eggshell collection at the Yale Peabody Museum of Natural History for her dinosaur eggshell coloration study. Photograph: Courtesy of the Peabody Museum of Natural History, Yale University, New Haven, Connecticut.
Dinosaur egg with bumpy shell, on right, with a collection of colorful bird eggs. The dark area on the left side of the dinosaur egg was likely blue in color. Photograph: Jasmina Wiemann. in The Evolution of Natural History Collections
Dinosaur egg with bumpy shell, on right, with a collection of colorful bird eggs. The dark area on the left side of the dinosaur egg was likely blue in color. Photograph: Jasmina Wiemann.
Fig. 2 in Review of the firefly visual system (Coleoptera: Lampyridae) and evolution of the opsin genes underlying color vision
Fig. 2 Opsin phylogeny; best scoring maximum likelihood tree from 200 replicates (log likelihood: −59449.717677). Bootstrap values based on 1000 replicates over 70 indicated at nodes. Long-wavelength-sensitive
Fig. 1 in Review of the firefly visual system (Coleoptera: Lampyridae) and evolution of the opsin genes underlying color vision
Fig. 1 Top: Summary of known sensitivities for UVS and LWS opsins (from the ERG data) and luciferase color emissions (only fireflies with available ERG and emission data are included). Bottom: Visual spectrum (in nm). White bars indicate UV and LW sensitivities based on available ERG data for fireflies in top; black bar indicates luciferase emission spectrum from top
Fig. 4 in Microanatomy and evolution of the nanostructures responsible for iridescent coloration in Trogoniformes (Aves)
Fig. 4 Iridescence-producing nanostructures at 8000× magnification. a Apaloderma vittatum. b Apaloderma narina. c Harpactes oreskios. d Harpactes diardii. e Harpactes ardens. f Euptilotis neoxenus. g
Fig. 5 in Microanatomy and evolution of the nanostructures responsible for iridescent coloration in Trogoniformes (Aves)
Fig. 5 Iridescence-producing nanostructures at 8000× magnification in species of Trogon. a T. elegans. b T. mexicanus. c T. personatus. d T. collaris. e T. comptus. f T. melanurus. g T. massena. h T. violaceus. i T. curucui. j T. viridis. k T. citreolus. l T. melanocephalus
Fig. 1 in Microanatomy and evolution of the nanostructures responsible for iridescent coloration in Trogoniformes (Aves)
Fig. 1 General anatomy of feather barbules in Trogoniformes, showing the iridescence-producing nanostructures
Fig. 3 in Microanatomy and evolution of the nanostructures responsible for iridescent coloration in Trogoniformes (Aves)
Fig. 3 Global scenario for anatomical tendencies in the evolution of the nanostructures responsible for iridescent coloration in Trogoniformes
Data from: Divergence in coloration and the evolution of reproductive isolation in the Anolis marmoratus species complex
Open the record for dataset details and reuse information.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.