Variability in the Structure of Planktonic Microalgae Assemblages in Water Column Associated with Posidonia oceanica (L.) Bed in Tunisia

Table 3

Results of SIMPER procedure showing distribution of discriminating species between stations around Posidonia bed and unvegetated habitat.

Species	Stations around; Posidonia bed	Unvegetated habitat
	Av. Abund	Av. Abund	Av. Diss	Diss/SD	Contrib%	Cum.%
Navicula sp.	2108.33	58.33	33.89	1.17	38.02	38.02
Peridinium sp.	29.17	225	12.92	1.18	14.49	52.51
Pleurosigma sp.	87.5	0	6.62	0.96	7.43	59.94
Nitzschia fontifugua	227.78	0	4.7	1.09	5.28	65.21
Guinardia sp.	44.44	0	4.08	0.73	4.58	69.79
Ostreopsis ovata	79.17	0	3.52	0.64	3.95	73.74
Spirulina subsalsa	0	50	3.22	0.97	3.61	77.35
Licmophora sp.	121.25	0	2.89	0.96	3.24	80.6
Prorocentrum lima	38.89	50	2.81	0.82	3.15	83.75
Coolia monotis	56.94	0	2.41	0.94	2.71	86.45
Polykrikos sp.	38.89	0	1.38	0.64	1.55	88.01
Prorocentrum micans	37.5	0	1.08	0.55	1.22	89.22
Coscinodiscus sp.	33.33	0	1.07	0.56	1.2	90.42