population structure, conservation, phenotypic plasticity, harvesting, gastropod, reproduction, Macaronesia, Reduction, Animals, Fecundity, Males, Abundance, Oocytes, Exploitation, Females, Replenishment, Sex, Macaronésia, Macaronésia, Macaronésia, Macaronésia, Macaronésia, Macaronesian, Macaronésia, Macaronesian, Macaronésie, Macaronésia, Macaronesian, Maca...