1 23 Journal of Applied Phycology ISSN 0921-8971 Volume 26 Number 6 J Appl Phycol (2014) 26:2283-2293 DOI 10.1007/s10811-014-0260-3 Under low irradiation, the light regime modifies growth and metabolite production in various species of microalgae Wassim Guermazi, Salma Masmoudi, Saoussen Boukhris, Habib Ayadi & Annick Morant-Manceau