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5 results for “intertidal arthropods”
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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Raw coordinates and measurements from: Like parent, like child -Ontogenetic development of claws of intertidal arthropods (Acari, Oribatida) from different ecological niches
<p>The shape of claws of adult air-breathing intertidal oribatid mites shows a strong correlation with ecology. As nothing is known about juvenile characteristics of this trait, the ontogenetic development of these attachment devices was studied for the first time with comprehensive geometric morphometric methods. In nine investigated species, claws of immature stages can be classified into the same ecological categories as adults, i.e. juveniles of several rock-dwelling species already show higher and stronger curved claw shapes with smaller claw angles, while juvenile instars of the single investigated mangrovedwelling species possess lower and less curved claws with wider claw angles. For each species, claw curvature is almost static during the complete development and claw length grows directly proportional with increasing body size. Developmental changes in body size and weight are thus mainly compensated by a simple relative growth in size. Despite the finding that claw shapes of early developmental stages are already classifiable into ecological categories, their shapes also change slightly during development to become more 'rock', 'mix' or 'mangrove'-like, respectively. The present results demonstrate that ecology is also the most important factor in shaping the claws of immatures and that attachment in the intertidal environment is vital for the survival of each mobile stage.</p>
Raw coordinates and measurements from: Like parent, like child -Ontogenetic development of claws of intertidal arthropods (Acari, Oribatida) from different ecological niches
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Testing for phylogenetic signal in claws suggests great influence of ecology on Caribbean intertidal arthropods (Acari, Oribatida)
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