Morphology and distribution of some marine diatoms of the genus <i>Rhizosolenia</i> in the lagoon of Nador (North East of Morroco)

This work aims to study the distribution and quantification of genus Rhizosolenia known for its abundance diversity among planktonic diatoms at 9 sampling stations in Nador lagoon during 2 seasons (spring summer 2018). The collected were identified morphologically using an inverted optical microscope. A total 10 species have been listed including: bushsolei, R alata forma alata, bergonii, cochlea, hyalina, imbricata, setigera, sp styliformis . quantitative analysis shows that maximum cell density was recorded respectively 7 located center lagoon, with values 21680 Cell/l 15710 Cell/l. However, minimum station 5 corresponding Oued Bou Areg edge a value 5120