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.
36
datasets available to search
ShareScore release 0.9.0
Dataset results
36 results for “ecological character”
FIGURE 6. Character 12 in Phylogeny, taxonomy and flower-breeding ecology of the Colocasiomyia cristata species group (Diptera: Drosophilidae), with descriptions of ten new species
FIGURE 6. Character 12 of costal setae on the wing (anterodistal portion) of Colocasiomyia xenalocasiae (Okada) (A), C. colocasiae (Duda) (B) and C. cristata de Meijere (C). Scale bars: 0.1 mm.
Sexual dimorphism in an adaptive radiation: Does intersexual niche differentiation result in ecological character displacement?
<p>Evolutionary radiations are one plausible explanation for the rich biodiversity on Earth. Adaptive radiations are the most studied form of evolutionary radiations and ecological opportunity has been identified as one factor permitting them. Competition among individuals is supposedly highest in populations of conspecifics. Divergent modes of resource use might minimize trophic overlap, and thus intersexual competition, resulting in ecological character displacement between sexes. However, the role of intersexual differentiation in speciation processes is insufficiently studied. The few studies available suggest that sexual niche differentiation exists in adaptive radiations, but their role within the radiation, and the extent of differentiation within the organism itself, remains largely unexplored. Here, we test the hypothesis that multiple morphological structures are affected by sexual niche differentiation in "roundfin" <i>Telmatherina</i>, the first case where sexual niche differentiation was demonstrated in an adaptive fish radiation. We show that sexes of two of the three morphospecies differ in several structural components of the head, all of these are likely adaptive. Sexual differentiation is linked to the respective morphospecies-specific ecology and affects several axes of variation. Trait variation translates into different feeding modes, processing types and habitat usages that add to interspecific variation in all three morphospecies. Intrasexual selection, i.e. male-male competition, may contribute to variation in some of the traits, but appears unlikely in internal structures which are invisible for other individuals. We conclude that intersexual variation adds to the adaptive diversity of roundfins, and might play a key role in minimizing intersexual competition in emerging radiations.</p>
Figure 2 in Discovery of a predaceous drosophilid Acletoxenus indicus Malloch in South China, with descriptions of the taxonomic, ecological and molecular characters (Diptera: Drosophilidae)
Figure 2. Acletoxenus indicus Malloch. (A) Adult; (B) larvae (green) preying upon spiralling whitefly on the underside of guava leaf; (C) coarctate pupae of spiralling whitefly; (D) puparium after eclosion. [This figure can be viewed in colour online.]
Figure 1 in Discovery of a predaceous drosophilid Acletoxenus indicus Malloch in South China, with descriptions of the taxonomic, ecological and molecular characters (Diptera: Drosophilidae)
Figure 1. Acletoxenus indicus Malloch, male. (A) Head; (B) wing; (C) epandrium (epan), cercus (cerc) and surstylus (sur) (lateral view); (D) hypandrium (hypd), paramere (pm), aedeagus (aed) and aedeagal apodeme (aed a) (lateral view). Scale bars: 0.1 mm.
FIGURE 4. Ditiola haasii, micromorphological characters. A in Ditiola haasii (Basidiomycota, Dacrymycetaceae)-taxonomy and ecology of a rare species from Central Europe
FIGURE 4. Ditiola haasii, micromorphological characters. A: Terminal cells of cortical hyphae. B: Three-septate mature basidiospores. C: Basidiospores with different degrees of septation and microconidia. D–F: Basidia in different degrees of development. A–B and D: PRM 944647; C, E–F: PRM 922888. Scale bars: 10 µm. Photos J.C. Zamora.
Sexual dimorphism in an adaptive radiation: Does intersexual niche differentiation result in ecological character displacement?
Open the record for dataset details and reuse information.
Data from: Digest: trait variation in Mimulus provides new evidence for the joint action of ecological sorting and character displacement
Open the record for dataset details and reuse information.
Data from: Habitat segregation and ecological character displacement in cryptic African malaria mosquitoes
Open the record for dataset details and reuse information.
Data from: Ecological character displacement between a native and an introduced species: the invasion of Anolis cristatellus in Dominica
Open the record for dataset details and reuse information.
Data from: The association between morphological and ecological characters across a global passerine radiation
Open the record for dataset details and reuse information.
Data from: Ecological character displacement between the sexes
Theory suggests the evolution of sexual dimorphism in ecologically relevant traits can evolve purely through competition between the sexes for a shared resource. Although more parsimonious hypotheses exist for the evolution of ecological sexual dimorphisms, there are some underappreciated reasons to expect that competition may often play some role in the evolution of sexual dimorphism. Here, we build on past work to outline a set of sufficient criteria to demonstrate a role for resource competition in the evolution of sexual dimorphism, the most critical of which is that resource competition can be directly linked to sexual divergence along the axis of ecologically-relevant dimorphism. We then compare the geometry of fitness surfaces across experimental manipulations of density and sex ratio in a semiaquatic salamander (Notophthalmus viridescens). We find consistent disruptive selection on multivariate sexual dimorphism in feeding morphology, which increases in strength with density. Fitness and the strength of divergent selection are negative-frequency dependent in the manner expected under competition-driven divergence between the sexes. Our results constitute direct evidence of resource competition as a driver of sexually-antagonist selection and consequently the evolution of sexual dimorphism, showing how cause and effect can be separated in studies of ecological sexual dimorphism. We suggest resource competition may contribute to sexual divergence jointly with other sources of sex-biased selection, especially when ecological opportunity is sex-specific. EndDryadContent
Data from: Positive feedback between ecological and reproductive character displacement in a young avian hybrid zone
Character displacement can reduce costly interspecific interactions between young species. We investigated the mechanisms behind divergence in three key traits - breeding habitat choice, timing of breeding and plumage coloration - in Ficedula flycatchers. We found that male pied flycatchers became expelled from the preferred deciduous habitat into mixed forest as the superior competitor, collared flycatchers, increased in numbers. The peak in food abundance differs between habitats, and the spatial segregation was paralleled by an increased divergence in timing of breeding between the two species. Male pied flycatchers vary from brown to black with brown coloration being more frequent in sympatry with collared flycatchers, a pattern often proposed to result from selection against hybridization, i.e. reinforcement. In contrast to this view, we show that brown male pied flycatchers more often hybridize than black males. Male pied flycatcher plumage coloration influenced the territory obtained in areas of co-occurrence with collared flycatchers, and brown male pied flycatchers experienced higher relative fitness than black males when faced with heterospecific competition. We suggest that allopatric divergence in resource defense ability causes a feedback loop at secondary contact where male pied flycatchers with the most divergent strategy compared to collared flycatchers are favored by selection.
Data from: An holistic ecological analysis of the diet of Cory’s shearwaters using prey morphological characters and DNA barcoding
Open the record for dataset details and reuse information.
Data from: Ecological character displacement between the sexes
Open the record for dataset details and reuse information.
Data from: Positive feedback between ecological and reproductive character displacement in a young avian hybrid zone
Open the record for dataset details and reuse information.
Data from: Understanding the evolution of ecological sex differences: integrating character displacement and the Darwin-Bateman paradigm
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.