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7 results for “claw shape”
Data from: Quantifying shape and ecology in avian pedal claws: the relationship between the bony core and keratinous sheath
Terrestrial tetrapods use their claws to interact with their environments in a plethora of ways. Birds in particular have developed a diversity of claw shapes since they are often not bound to terrestrial locomotion and have heterogeneous body masses ranging several orders of magnitude. Numerous previous studies have hypothesized a connection between pedal claw shape and ecological mode in birds, yet have generated conflicting results, spanning from clear ecological groupings based on claw shape to a complete overlap of ecological modes. The majority of these studies have relied on traditional morphometric arc measurements of keratinous sheaths and have variably accounted for likely confounding factors such as body mass and phylogenetic relatedness. To better address the hypothesized relationship between ecology and claw shape in birds, we collected 580 radiographs allowing visualization of the bony core and keratinous sheath shape in 21 avian orders. Geometric morphometrics was used to quantify bony core and keratinous sheath shape and was compared to results using traditional arc measurements. Neither approach significantly separates bird claws into coarse ecological categories after integrating body size and phylogenetic relatedness; however, some separation between ecological groups is evident and we find a gradual shift from the claw shape of ground-dwelling birds to those of predatory birds. Further, the bony claw core and keratinous sheath are significantly correlated, and the degree of functional integration does not differ across ecological groups. Therefore, it is likely possible to compare fossil bony cores with extant keratinous sheaths after applying corrections. Finally, traditional metrics and geometric morphometric shape are significantly, yet loosely correlated. Based on these results, future workers are encouraged to use geometric morphometric approaches to study claw geometry and account for confounding factors such as body size, phylogeny, and individual variation prior to predicting ecology in fossil taxa.
Get a grip - evolution of claw shape in relation to microhabitat use in intertidal arthropods (Acari, Oribatida)
<p>Claws may be the most common biological attachment devices in animals but relatively few studies have examined the ecological and evolutionary significance of their morphology. We performed the first geometric morphometric investigation of arthropod claws ever using 15 intertidal oribatid mite species from two different families living in three different habitat types to determine if claw shape is correlated with ecology. Our results show that species living on rocky shores show remarkably high and strongly curved claws while species from mangrove habitats show significantly lower and less curved claws. Euryoecious species being able to dwell in a wide range of habitats show an intermediate claw type. These results indicate a strong relationship between claw shape and microhabitat whereas the best predictors of microhabitat use seem to be claw height and curvature. Claw length varied to some degree between the species but without any noticeable ecological pattern. A comparison with terrestrial and freshwater aquatic oribatid mite species, on the other hand, confirms that their claws are only half as long as that of intertidal mites and it is suggested that tidal flooding and wave action strongly selects for long claws. The present results indicate that claw morphology may play an important role in niche separation and hence demonstrate the importance of ecomorphological studies, especially in the microarthropod group which occupies a vast array of microhabitats.</p>
Get a grip - evolution of claw shape in relation to microhabitat use in intertidal arthropods (Acari, Oribatida)
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Data from: Quantifying shape and ecology in avian pedal claws: the relationship between the bony core and keratinous sheath
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FIGURES 12–15. Dicronychus talhouki. 12. Claw. 13. Prosternum without V-shaped suture. 14. Habitus, 15. Male genitalia, dorsal.16 in Contribution to the knowledge of the genus Dicronychus (Coleoptera: Elateridae) from the Kingdom of Saudi Arabia
FIGURES 12–15. Dicronychus talhouki. 12. Claw. 13. Prosternum without V-shaped suture. 14. Habitus, 15. Male genitalia, dorsal.16. Bursa copulatrix sclerite.
Data from: Claw morphometrics in monitor lizards: variable substrate and habitat use correlate to shape diversity within a predator guild
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Habitat use, interspecific competition, and phylogenetic history shape the evolution of claw and toepad morphology in Lesser Antillean anoles
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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.
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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
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