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Relations entre zonation verticale, comportement de "zone homing" et équilibre acide-base de l'hémolymphe chez Monoda lineata (gasteropode, trichide) = Correlation between vertical zonation and homing behavior and the acid-base equilibrium of the haemolymph of Monoda lineata (Gastropoda: Trichidae)
Defossez, J.-M. (1995). Relations entre zonation verticale, comportement de "zone homing" et équilibre acide-base de l'hémolymphe chez Monoda lineata (gasteropode, trichide) = Correlation between vertical zonation and homing behavior and the acid-base equilibrium of the haemolymph of Monoda lineata (Gastropoda: Trichidae). Cah. Biol. Mar. 36(1): 21-27
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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  • Defossez, J.-M.

Abstract
    Monodonta lineata (Gastropod, Trochid) is present only at high levels of the intertidal zone. When experimentally placed at low levels, it crawls up towards its characteristic position on the seashore. Our data about the pH, P sub(CO)d2 and [HCO super(-) sub(3)] values of the haemolymph lead to the conclusion that these parameters could be used as internal signals by M. lineata in order to choose its optimal level on the seashore. Indeed, (1) relative extracellular acidosis and alkalosis are induced by emersion and submersion respectively and (2) the range of these induced disturbances is influenced by the percentage of exposure to the air (PEA) imposed on the animals: a high PEA (typical of high shore levels) induced lower disturbances than a low PEA (typical of low levels, never occupied by M. lineata in the field). We propose the following hypothesis: the haemolymph hypocapnia (P sub(CO2) around 1 torr) occurring in M. lineata during submersion, characteristic of low levels of the shore, induces a negative geotactism and/or a positive phototactism which results in the observed crawling up towards the higher levels of the intertidal zone.

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