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1,369 results for “sexual dimorphism”
Fig. 1 in A New Genus and Species of Histerid Beetle from Western Mexico Showing a Remarkable Sexual Mesotibial Dimorphism (Coleoptera: Histeridae: Histerinae: Exosternini)
Fig. 1. Vaquerister cantador, new species, habitus photos of male. A) Dorsal view, B) Ventral view, C) Anterior view of head and prothorax, D) Lateral view, E) Posterior view of propygidium and pygidium.
Figure 7. Limnebius structural sexual dimorphism 3 in Morphological diversification with emphasis on the structural and homology patterns of male genitalia in genus Limnebius (Leach 1815; Hydraenidae: Coleoptera)
Figure 7. Limnebius structural sexual dimorphism 3: protibia. A, L. mesatlanticus; B, L. fretalis; C, typical female tibia (L. fretalis) for comparison.
Figure 6. Limnebius structural sexual dimorphism 2 in Morphological diversification with emphasis on the structural and homology patterns of male genitalia in genus Limnebius (Leach 1815; Hydraenidae: Coleoptera)
Figure 6. Limnebius structural sexual dimorphism 2: abdomen. A, L. furcatus; B, L. fretalis. (s, setae; p, protuberance).
Figure 5. Limnebius structural sexual dimorphism 1 in Morphological diversification with emphasis on the structural and homology patterns of male genitalia in genus Limnebius (Leach 1815; Hydraenidae: Coleoptera)
Figure 5. Limnebius structural sexual dimorphism 1: metatibia. A, typical female tibia (L. fretalis) for comparison; B, L. fretalis; C, L. furcatus; D, L. truncatellus.
Data from: Structural complexity of hunting habitat and territoriality increase the reversed sexual size dimorphism in diurnal raptors
Despite numerous efforts and many hypotheses to explain the selective pressures that may have favoured reversed sexual dimorphism (RSD) in raptors ‐ i.e. that the female is larger than the male ‐ some drivers of RSD are still unknown. Here we analyse how much variation in RSD is explained by hunting habitat structure, territoriality or territory size. We do so using data on diurnal raptors from the New World and the Western Palearctic – i.e. Cathartidae, Pandionidae, Accipitridae and Falconidae, the largest bird group showing RSD ‐ taking into account the phylogenetic relationships among species. Our results identify the type of the main prey as a major factor explaining RSD in raptors. We also found RSD to increase with increasing structural complexity in the hunting habitat from open or semi‐open habitats to forest interior. RSD also increased with increasing degree of territoriality of the species (non‐territorial < facultative < territorial). Finally, for territorial species RSD increased with increasing size of nesting territory. A model comprising only three predictor variables (prey type, structural complexity of hunting habitat and territoriality) explained up to 50% of the variation in RSD of European and American diurnal raptor species, and up to 40% of the variation in RSD when only territorial species were considered. Our results highlight the relevance of spatial facets of the niche – e.g. hunting habitat, territoriality and territory size ‐ in exerting selective pressures on the body size of diurnal raptors. These selective pressures, joint with already known trophic factors – e.g. diet ‐ are decisive for the evolution of the RSD, a key trait in the functional ecology of raptors. Our findings open up new perspectives in the study of sexual size divergence in birds.
FIGURE 3 in Morphological variation and sexual dimorphism in the California skate, Raja inornata Jordan and Gilbert, 1881 from the Gulf of California, Mexico
FIGURE 3. Relationship between the number of middorsal thorns (T) and total length. Males (Π), T =0.003 TL + MD MD 2.51; r2=0.16; females (), T =0.01 TL – 0.76; r2=0.32.
FIGURE 2 in Morphological variation and sexual dimorphism in the California skate, Raja inornata Jordan and Gilbert, 1881 from the Gulf of California, Mexico
FIGURE 2. Relationship between the number of orbital thorns (T) and total length. Males (Π), T =0.01 TL+3.75; O O r2=0.16; females (), T =0.02 TL+1.31; r2=0.64.
FIGURE 5 in Morphological variation and sexual dimorphism in the California skate, Raja inornata Jordan and Gilbert, 1881 from the Gulf of California, Mexico
FIGURE 5. Bi-plot of canonical scores for factors 1 and 2 from DA of female and male R. inornata and male R. cortezensis. Discriminant analysis based on 12 morphometric characters. (+) R. inornata-males; () R. inornata-females and (o) R. cortezensis-males. (read text for explaination).
FIGURE 4 in Morphological variation and sexual dimorphism in the California skate, Raja inornata Jordan and Gilbert, 1881 from the Gulf of California, Mexico
FIGURE 4. Photographs of male and female upper jaw teeth (symphysial teeth) of juveniles and adults of Raja inornata: (A) mature female, 570 mm LT; (B) juvenile female, 262 mm LT; (C) mature male, 500 LT and (D) juvenile male, 262 mm LT (photographs 25 X).
FIGURE 1 in Morphological variation and sexual dimorphism in the California skate, Raja inornata Jordan and Gilbert, 1881 from the Gulf of California, Mexico
FIGURE 1. Morphometric measurements made on R. inornata and R. cortezensis. (A) Dorsal and (B) ventral views (see table 1 for definitions)(Figure from McEachran & Notarbartolo di Sciara, 1995).
FIGURE 2 in Range, sexual dimorphism and bilateral asymmetry of rostral tooth counts in the smalltooth sawfish Pristis pectinata Latham (Chondrichthyes: Pristidae) of the southeastern United States
FIGURE 2. Relative frequency of left and right side rostral tooth counts for Pristis pectinata specimens from the southeastern United States. A) All specimens (n= 105). B) Males (n=25). C) Females (n=26).
FIGURE 1 in Range, sexual dimorphism and bilateral asymmetry of rostral tooth counts in the smalltooth sawfish Pristis pectinata Latham (Chondrichthyes: Pristidae) of the southeastern United States
FIGURE 1. Relative frequency of total rostral tooth counts for Pristis pectinata from the southeastern United States (n=105).
FIGURE 3 in Range, sexual dimorphism and bilateral asymmetry of rostral tooth counts in the smalltooth sawfish Pristis pectinata Latham (Chondrichthyes: Pristidae) of the southeastern United States
FIGURE 3. Relative frequency of rostral tooth count bilateral asymmetry in Pristis pectinata from the southeastern United States (n=105)
Figure 5 in Reproduction, diet and sexual dimorphism of Gymnodactylus geckoides Spix, 1825 (Sauria: Squamata) from a Restinga area in northeastern Brazil
Figure 5. Linear regression between SVL (Snout-vent length) and prey size of Gymnodactylus geckoides from a Restinga Fragment at Centro de Lançamento da Barreira do Inferno, Parnamirim Municipality, Rio Grande do Norte State, Brazil.
Figure 4 in Reproduction, diet and sexual dimorphism of Gymnodactylus geckoides Spix, 1825 (Sauria: Squamata) from a Restinga area in northeastern Brazil
Figure 4. Distribution of snout-vent lengths per month of male and female Gymnodactylus geckoides from a Restinga fragment in Rio Grande do Norte State, Brazil.
Figure 2 in Reproduction, diet and sexual dimorphism of Gymnodactylus geckoides Spix, 1825 (Sauria: Squamata) from a Restinga area in northeastern Brazil
Figure 2. Location of Centro de Lançamento da Barreira do Inferno, Parnamirim Municipality, Rio Grande do Norte State, Brazil.
Figure 1 in Reproduction, diet and sexual dimorphism of Gymnodactylus geckoides Spix, 1825 (Sauria: Squamata) from a Restinga area in northeastern Brazil
Figure 1. Gymnodactylus geckoides (unvouchered specimen), from Centro de Lançamento da Barreira do Inferno, Parnamirim, Rio Grande do Norte, Brazil.
Figure 3 in Reproduction, diet and sexual dimorphism of Gymnodactylus geckoides Spix, 1825 (Sauria: Squamata) from a Restinga area in northeastern Brazil
Figure 3. Total number of Gymnodactylus geckoides individuals collected per month from a Restinga fragment in Rio Grande do Norte State, Brazil.
Figure 1 in Sexual dimorphism in chelicerae, forelegs and palpal traits in two burrowing wolf spiders (Araneae: Lycosidae) with sex-role reversal
Figure 1. Dimorphism in chelicerae pigmentation (frontal views). Males (A, C) show darker pigmentation than females (B, D) in both species: Allocosa brasiliensis (above) and Allocosa alticeps (below).
Figure 3 in Sexual dimorphism in chelicerae, forelegs and palpal traits in two burrowing wolf spiders (Araneae: Lycosidae) with sex-role reversal
Figure 3. Palpal tarsi (lateral views) of Aglaoctenus lagotis (A,B) and Schizocosa malitiosa (C,D), showing female claws (A,C), and male palpal tarsus without claws or specialized structures on distal position (B,D).
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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)
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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.