Tests and jaws’ morphological patterns of regular sea urchin Paracentrotus lividus (Lamarck, 1816) in relation to environmental conditions

Type Article
Date 2020-03
Language English
Author(s) Caill-Milly NathalieORCID1, Mahias Jérémy2, 3, Bru Noelle2, 3, de Casamajor Marie-NoelleORCID1, Pigot Thierry4, Corbet Paul1
Affiliation(s) 1 : IFREMER, Laboratoire Environnement Ressources Arcachon - Fédération MIlieux et Ressources Aquatiques (MIRA), 1 Allée du Parc Montaury, 64600 Anglet, France
2 : UNIV PAU & PAYS ADOUR, Collège STEE – 1 Allée Parc Montaury, 64600 Anglet, France
3 : CNRS/ UNIV PAU & PAYS ADOUR/ E2S UPPA, Laboratoire de Mathématiques et de leurs Applications de Pau (LMAP) - Fédération MIlieux et Ressources Aquatiques (MIRA), UMR5142, 64000 Pau, France
4 : CNRS/ UNIV PAU & PAYS ADOUR/ E2S UPPA, Institut des Sciences Analytiques et de Physico- Chimie pour l’Environnement et les Matériaux (IPREM) – Fédération MIlieux et Ressources Aquatiques (MIRA), UMR5254, 64600 Anglet, France
Source Regional Studies In Marine Science (2352-4855) (Elsevier), 2020-03 , Vol. 35 , P. 101220 (11p.)
DOI 10.1016/j.rsma.2020.101220
Keyword(s) Morphometry, Body size, Aristotle's lantern, Sewage discharge, Coastal zone, Biological indices
Abstract

This paper investigates whether morphological variability of test and Aristotle’s lantern can be detected in sea urchins exposed to domestic pollution and whether this variability can be also related to tidal level and hydrodynamic features. The study was conducted on four sites along the French Basque coast. Each site is characterized by its geological layers’ orientation, regardless of its proximity to sewage outlets. Analyses on high-resolution pictures of jaws were performed and three parameters were retained: length, height and demipyramid dry mass. Five shape descriptors were consequently defined regarding the test and the jaws. Individuals with heavy test density associated with highly developed demipyramid regarding test diameter and height were preferentially observed in intertidal areas, remoteness from treatment plants and in south-oriented geological layers. High test hemispherical index and demipyramid elongation index were preferentially found far away from treatment plants. Results contribute to improving knowledge on pressure impact assessment and on state of the environment conservation in a defined area. It may also be useful to propose management measures on an appropriate scale for a species that is usually managed on a regional basis.

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Caill-Milly Nathalie, Mahias Jérémy, Bru Noelle, de Casamajor Marie-Noelle, Pigot Thierry, Corbet Paul (2020). Tests and jaws’ morphological patterns of regular sea urchin Paracentrotus lividus (Lamarck, 1816) in relation to environmental conditions. Regional Studies In Marine Science, 35, 101220 (11p.). Publisher's official version : https://doi.org/10.1016/j.rsma.2020.101220 , Open Access version : https://archimer.ifremer.fr/doc/00612/72402/