Effect of static magnetic field on terrestrial isopods (Isopoda: Oniscidea)

Béjaoui, M.; Khalloufi, Noureddine; Touaylia, Samir

doi:10.1093/jcbiol/ruy104

Journal of Crustacean Biology

2019

DOI: 10.1093/jcbiol/ruy104

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Effect of static magnetic field on terrestrial isopods (Isopoda: Oniscidea)

M. Béjaoui

Noureddine Khalloufi

Samir Touaylia

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Cited by 2 publications

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“…Typically viewed as a defensive response, enrolment is first recorded in animals in the Cambrian and continues through the Phanerozoic to modern animals. Today, vertebrates such as hedgehogs (Heatley 2009), pangolins (Tenaza 1975) and armadillos (Superina & Loughry 2012), and invertebrates, such as isopods (Béjaoui et al 2019), shrimp larvae (Haug & Haug 2014) and millipedes (Golovatch & VandenSpiegel 2014;Tuf et al 2016), show this defensive behaviour. Trilobites were the first animals to implement this adaptative behaviour (Ortega-Hernández et al 2013), presenting specialized morphological features (coaptative structures) in their bodies that allowed for enrolment to be executed (Chatterton & Campbell 1993;Clarkson & Whittington 1997;Esteve et al 2011).…”

mentioning

confidence: 99%

Morphological diversity and disparity in trilobite cephala and the evolution of trilobite enrolment throughout the Palaeozoic

Suárez

Esteve

2021

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Morphology permits the extracting of information to study patterns of disparity and diversity of a particular group of animals through time. Enrolment is a characteristic behaviour of trilobites, having been first recorded in the Cambrian and continued until their demise at the end of Permian mass extinction. Morphological trends related to enrolment strategies have been documented previously but are yet to have been analysed in a morphospace framework. Here we analyse the cephalic shape of a wide range of trilobite taxa using geometric morphometrics. These methodologies were implemented to explore whether the relationship between the shape of the head and the evolution of different enrolment styles correspond with an increase in morphospace or disparity during the Palaeozoic. Our results show distinct patterns of diversity and disparity in the functional morphology of trilobites during the Palaeozoic. Furthermore, these analyses show that enrolment types in trilobites without interlocking devices (e.g. cylindrical) permit more flexibility in the head shape, promoting higher rates of disparity, possibly leading to an enhanced ability to occupy a broad range of ecological niches. On the contrary, lower disparity cephalic shape constrains the way to enclose the body and consequently places limitations on the ability to adapt to new niches. Our results indicate that the higher rates of morpho-functional diversity and disparity coincide with the increase of morphospace in radiations in the early Palaeozoic (Cambrian and Ordovician) but also immediately after the Carboniferous-Permian biodiversification event. Low disparity rates constrain the success of trilobites with a specific enrolment type. Finally, the results show that sphaeroidal enrolment style was the most successful type that evolved independently in all trilobite orders. □ Arthropods, ecology, ecomorphology, evolution, functional morphology.

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confidence: 99%

Morphological diversity and disparity in trilobite cephala and the evolution of trilobite enrolment throughout the Palaeozoic

Suárez

Esteve

2021

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Effet du champ magnétique statique sur les préférences écologiques de trois isopodes terrestres (Isopoda, Oniscidea)

et al. 2019

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RésuméDans ce travail, nous avons analysé les préférendums photique, thermique, hygrique et granulométrique de trois espèces d’isopodes terrestres : Armadillidium vulgare (Latreille, 1804), A. granulatum (Brandt, 1833), et Porcellio laevis Latreille, 1804 en réponse à un champ magnétique statique (CMS) (0 Hz, 200 mT). Les animaux exposés au CMS montrent une augmentation significative du nombre des spécimens photophiles et une diminution significative des animaux photophobes. Ces cloportes montrent aussi une diminution significative des spécimens préférant le froid et une augmentation significative de ceux préférant le compartiment chaud. Cette exposition au CMS cause un inversement très significatif du choix préférentiel du compartiment humide au compartiment sec chez A. vulgare et P. laevis, alors que ce changement n’est pas significatif chez A. granulatum. Cette même exposition a entrainé une nette perturbation du choix de la granulométrie du substratum, en particulier pour le gravier chez A. vulgare.

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Effect of static magnetic field on terrestrial isopods (Isopoda: Oniscidea)

Cited by 2 publications

References 31 publications

Morphological diversity and disparity in trilobite cephala and the evolution of trilobite enrolment throughout the Palaeozoic

Morphological diversity and disparity in trilobite cephala and the evolution of trilobite enrolment throughout the Palaeozoic

Effet du champ magnétique statique sur les préférences écologiques de trois isopodes terrestres (Isopoda, Oniscidea)

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