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45 results for “male genital structures”
Data from: Multiple sexual selection pressures drive the rapid evolution of complex morphology in a male secondary genital structure
The genitalia of internally fertilizing taxa represent a striking example of rapid morphological evolution. Although sexual selection can shape variation in genital morphology, it has been difficult to test whether multiple sexual selection pressures combine to drive the rapid evolution of individual genital structures. Here, we test the hypothesis that both pre- and postcopulatory sexual selection can act in concert to shape complex structural variation in secondary genital morphology. We genetically modified the size and shape of the posterior lobes of Drosophila melanogaster males and tested the consequences of morphological variation on several reproductive measures. We found that the posterior lobes are necessary for genital coupling and that they are also the targets of multiple postcopulatory processes that shape quantitative variation in morphology, even though these structures make no direct contact with the external female genitalia or internal reproductive organs during mating. We also found that males with smaller and less structurally complex posterior lobes suffer substantial fitness costs in competitive fertilization experiments. Our results show that sexual selection mechanisms can combine to shape the morphology of a single genital structure and that the posterior lobes of D. melanogaster are the targets of multiple postcopulatory selection pressures.
Data from: Mechanical incompatibility caused by modifications of multiple male genital structures using genomic introgression in Drosophila
Mechanical incompatibility of male and female genitalia is common in animals with internal fertilization. However, our knowledge regarding the precise mechanisms is limited. One key question regards the susceptibility of the match between male and female genitalia to morphological modification. To address this issue, we generated six different second-chromosome introgression lines possessing partially Drosophila mauritiana-like genital morphology in multiple structures in D. simulans background. Three of the six introgression males showed elevated mobility at some stages during copulation with D. simulans females; this was assumed to be an indication of genital mismatch. Notably, one of the introgression males with D. mauritiana-like enlarged anal plates showed occasional leakage of adhesive ejaculate on the body surface when mated with pure D. simulans females, suggesting apparent structural incompatibility in genital coupling. These observations suggested that both sexual and natural selection shape the anal plate morphology, highlighting the role of this structure as an important component of mechanical isolation. Partial replacement (introgression) by a sibling species genome can induce perturbations in genital coupling mechanics, suggesting that genital compatibility can be susceptible to subtle genomic changes at the early stages of divergence in these species.
Data from: Multiple sexual selection pressures drive the rapid evolution of complex morphology in a male secondary genital structure
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Data from: Mechanical incompatibility caused by modifications of multiple male genital structures using genomic introgression in Drosophila
Open the record for dataset details and reuse information.
Figure 2 in Genital coupling, morphology and evolution of male holding structures in Cicadinae (Hemiptera: Cicadidae)
Figure 2. Ornamentations of vesica of cicadas. A–D, aedeagus of Fidicina toulgoeti. A, left lateral view, with the dashed blue line delimiting the spines of the vesica. B, right lateral view, with the dashed red line delimiting the cornuti. C, magnification of spines of vesica under scanning electron microscopy. D, magnification of cornuti under scanning electron microscopy. E, F, aedeagus of Quesada gigas. E, right lateral view, with the dashed red line delimiting the cornuti in the vesica. F, magnification of cornuti under scanning electron microscopy. Abbreviations: cor, cornuti; ltp, lateral theca process; sv, spines of vesica; vp, vesical process. Scale bars: 0.5 mm (A, B, E).
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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)
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.