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125 results for “male dimorphism”
Data from: Novel host plant leads to the loss of sexual dimorphism in a sexually-selected male weapon
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Data from: The role of male coloration and ornamentation in potential alternative mating strategies of the dimorphic jumping spider, Maevia inclemens
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Data from: Testosterone activates sexual dimorphism including male-typical carotenoid but not melanin plumage pigmentation in a female bird
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Data for: Size rather than complexity of sexual ornaments prolongs male metamorphosis and explains sexual size dimorphism in sepsid flies
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Can sexual selection promote within-species divergence of male genitalia? A study case with a male-dimorphic arachnid
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Selection for increased male size predicts variation in sexual size dimorphism among fish species
<p><a name="_Hlk23424265">Variation in the degree of sexual size dimorphism (SSD) among taxa is generally considered to arise from differences in the relative intensity of male-male competition and fecundity selection. One might predict, therefore, that SSD will vary systematically with: 1) the intensity of sexual selection for increased male size, and 2) the intensity of fecundity selection for increased female size. To test these two fundamental hypotheses, we conducted a phylogenetic comparative analysis of SSD in fish. Specifically, using </a>records of body length at first sexual maturity from FishBase, we quantified variation in the magnitude and direction of SSD in >600 diverse freshwater and marine fish species, from sticklebacks to sharks. Although female-biased SSD was common, and thought to be driven primarily by fecundity selection, variation in SSD was not dependent on either the allometric scaling of reproductive-energy output or fecundity in female fish. Instead, systematic patterns based on habitat and life history characteristics associated with varying degrees of male-male competition and paternal care, strongly suggest that adaptive variation in SSD is driven by the intensity of sexual selection for increased male size.</p>
Data from: Sneaker males affect fighter male body size and sexual size dimorphism in salmon
Large male body size is typically favored by directional sexual selection through competition for mates. However, alternative male life-history phenotypes, such as "sneakers," should decrease the strength of sexual selection acting on body size of large "fighter" males. We tested this prediction with salmon species; in southern populations, where sneakers are common, fighter males should be smaller than in northern populations, where sneakers are rare, leading to geographical clines in sexual size dimorphism (SSD). Consistent with our prediction, fighter male body size and SSD (fighter male∶female size) increase with latitude in species with sneaker males (Atlantic salmon Salmo salar and masu salmon Oncorhynchus masou) but not in species without sneakers (chum salmon Oncorhynchus keta and pink salmon Oncorhynchus gorbuscha). This is the first evidence that sneaker males affect SSD across populations and species, and it suggests that alternative male mating strategies may shape the evolution of body size.
Fig. 3 in Apharinodes sinensis sp. n. (Coleoptera: Staphylinidae: Pselaphinae) from China, and discovery of male wing dimorphism in Hybocephalini
Fig. 3. Dorsal habitus of Apharinodes species. (A) A. papageno, male paratype. (B) A. miranda, male. Scale bars: 0.5 mm.
Fig. 2 in Apharinodes sinensis sp. n. (Coleoptera: Staphylinidae: Pselaphinae) from China, and discovery of male wing dimorphism in Hybocephalini
Fig. 2. Details of male Apharinodes sinensis. (A) Head dorsum and pronotum (numbers indicate branches of squamous scales: 1. anterolateral branch; 2. basolateral branch; 3. mediobasal branch). (B) Head venter and prosternum. (C) Right antenna. (D) Tergite VIII. (E) Sternite VIII. (F) Sternite IX. (G) Aedeagus, in ventral view. (H) Same, in lateral view. Scale bars: A-C = 0.3 mm; D, E, G, H = 0.1 mm; F = 0.05 mm.
Fig. 1 in Apharinodes sinensis sp. n. (Coleoptera: Staphylinidae: Pselaphinae) from China, and discovery of male wing dimorphism in Hybocephalini
Fig. 1. Dorsal habitus of Apharinodes sinensis. (A) Macropterous male. (B) Apterous male. Scale bars: 0.5 mm.
FIGURE 8 in Description of the male of Phoebe ornator (Tippmann, 1960) (Coleoptera: Cerambycidae: Lamiinae: Hemilophini), analysis of the species biogeography, and first observation of chromatic gender dimorphism in Hemilophini
FIGURE 8. Potential distribution of Phoebe ornator (Tippmann, 1960) according to MaxEnt. The circles correspond to the totality of the locality data entry used to generate the model. The colour scale indicates the similarity between known and predicted habitats, red and orange represents areas with the highest probability of habitat suitability, beige typical conditions, and blue tones show low probabilities of habitat suitability.
FIGURE 7 in Description of the male of Phoebe ornator (Tippmann, 1960) (Coleoptera: Cerambycidae: Lamiinae: Hemilophini), analysis of the species biogeography, and first observation of chromatic gender dimorphism in Hemilophini
FIGURE 7. Ecoregion distribution of Phoebe ornator (Tippmann, 1960) according to the biogeographic regionalization by Olson et al. (2001).
FIGURES 1–3 in Description of the male of Phoebe ornator (Tippmann, 1960) (Coleoptera: Cerambycidae: Lamiinae: Hemilophini), analysis of the species biogeography, and first observation of chromatic gender dimorphism in Hemilophini
FIGURES 1–3 Phoebe ornator (Tippmann, 1960), dorsal (a) and lateral (b) habitus of males. 4–6, idem, females; 1, Brazil, Goiás, Campinas (MZSP); 2, Goiás, Vianópolis (MZSP); 3, Salinas, Tarija department, Bolivia (MZSP); 4, Goiás, Campinas (MZSP); 5, Caranavi, La Paz department, Bolivia (MZSP); 6, Potrerillo del Guenda, Santa Cruz department, Bolivia (ACMT).
FIG. 9. Ganiagraecia karwinia. A. Adult male. B. Adult female, note dimorphic for pronotal colouration. C in Studies in Australian Tettigoniidae: New short-winged Agraeciini from Australia (Orthoptera: Tettigoniidae; Conocephalinae; Agraeciini)
FIG. 9. Ganiagraecia karwinia. A. Adult male. B. Adult female, note dimorphic for pronotal colouration. C. Female head. Note fastigium of vertex. D. Adult female, tubercles of meso- and metathorax. E. Adult female, right hind femur. F. Adult male, frons. G. Adult male, thorax. Note prothoracic spines and tubercles of meso- and metathorax. H. Adult male, tip of abdomen, dorsal view. I. Left male cercus, dorsal view. J. Left male cercus, ventral view. K. Left male tegmen. L. Adult male, head and pronotum. Note fastigium of vertex. M. Adult male subgenital plate, ventral view. N. Adult female, tip of abdomen. Note shape of supraanal plate and shallow median sulcus. O. Adult female subgenital plate.
FIGURES 21–24 in Enigmatic male dimorphism in the Phlaeothripinae (Thysanoptera, Phlaeothripidae), with description of a new genus and species
FIGURES 21–24. Nazonothrips toshifumii gen. et sp. n., allometric male aptera. (21) Head–pelta, small individual; (22) Head– pronotum, large individual; (23) Pro-metasterna; (24) Fore leg.
FIGURES 14–20 in Enigmatic male dimorphism in the Phlaeothripinae (Thysanoptera, Phlaeothripidae), with description of a new genus and species
FIGURES 14–20. Nazonothrips toshifumii gen. et sp. n., head–pelta, 14–16. (14) Female aptera; (15) Gynecoid male aptera, large individual; (16) Gynecoid male aptera, small individual. Pro-metasterna, 17–18. (17) Female aptera; (18) Gynecoid male aptera. Fore leg, 19–20. (19) Female aptera; (20) Gynecoid male aptera.
FIGURES 2–13 in Enigmatic male dimorphism in the Phlaeothripinae (Thysanoptera, Phlaeothripidae), with description of a new genus and species
FIGURES 2–13. Nazonothrips toshifumii gen. et sp. n., female, 2–3. (2) Macroptera; (3) Aptera. Gynecoid male aptera, 4–5. (4) Large individual; (5) Small individual. Allometric male aptera, 6–7. (6) Large individual; (7) Small individual. Female macroptera, 8–13. (8) Head & pronotum; (9) Antenna; (10) Mesonotum–pelta; (11) Pro-metasterna; (12) Tergite V; (13) Tergite IX & tube.
FIGURES 3–5. Neoelmis guarani, male. 3 in Neoelmis guarani Shepard & Barr, a sexually dimorphic new species from Paraguay (Insecta: Coleoptera: Elmidae: Elminae)
FIGURES 3–5. Neoelmis guarani, male. 3. Left prothoracic leg, femur, dorsal view. 4. Left prothoracic leg, posteroventral view. 5. Left mesothoracic leg, anteroventral view.
FIGURES 1–14. Acothrura impunctata, male. 1 in Sexual dimorphism in the genus Acothrura Melichar, 1915 (Hemiptera: Lophopidae) and description of male and female specimens of A. impunctata (Jacobi, 1905)
FIGURES 1–14. Acothrura impunctata, male. 1. Adult, dorsal view; 2. Adult, lateral view; 3. Head and thorax, dorsal view; 4. Frons and clypeus, ventral view; 5. Genitalia, lateral view; 6. Genitalia, ventral view; 7. Hind legs; 8. Anal tube, dorsal view; 9. Phallic complex, left lateral view; 10. Phallic complex, right dorso-lateral view; 11. Phallic complex, left dorso-lateral view; 12. Phallic complex, dorso-caudal view; 13. Phallic complex, dorsal view; 14. Phallic complex, ventral view. Scale bars: 1–4, 7=1 mm; 5, 6, 8–14=0.2 mm.
FIGURES 29–30 in Sexual dimorphism in the genus Acothrura Melichar, 1915 (Hemiptera: Lophopidae) and description of male and female specimens of A. impunctata (Jacobi, 1905)
FIGURES 29–30. Acothrura impunctata, female genitalia including internal reproductive system, lateral view. Scale bars=0.2 mm.
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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.