Principales Exigences Écophysiologiques du Forficule des Sables, Labidura Riparia [Derm. Labiduridae

Abstract

SUMMARYCl. Caussanel: Main eco-physiological requirements of Labidura ripariaThe Dermaptere, Labidura riparia, has been studied in various habitats, i-e, on sea shores and river-sides of the France. In this study we distinguish three morphologically different types which live in different habitats. The type « Arcachon », with very clear integument, lives on oceanic sand beaches. The type « Racou », with brown integument, lives on the mediterranean sea-shores. The type « Pont du Gard », almost black is found mainly on the river-sides. On rearing separetely the above mentioned types we found that there are no significant morphological changes even after many generations. These three diiferent types seen to be determined by genetical factors.Labidura riparia is a burrowing species, adapted for sandy soils. It is a carnivorous species and predator on various Arthropods. It is remarkably adapted by polyphagous habits.Labidura riparia has a complicated reproduction. Before copulation, exists a nuptial parade, after which the female burrows the sandy soil and lays eggs in the hole made and having no passage to the surface. The eggs hatch into larvae after 8 to 10 days under the parental care of the female and only if it is not caused to any disturbances. During this period the female does not take any food. Among the various factors observed, the humidity and temperature were found to be very important.