Benthic molluscan macrofauna structure in heavily trawled sediments (Thermaikos Gulf, North Aegean Sea): spatiotemporal patterns

Table 3 Three-way ANOVA results considering biological descriptors values

Source of variation	Species number (S)	Abundance (N)	N1	N21
Sediment profile	df = 2	df = 2	df = 2	df = 2
	MS = 1.532	MS = 8.217	MS = 0.422	MS = 0.016
	F = 92.066	F = 43.408	F = 7.736	F = 14.272
	p = 0.001*	p = 0.001*	p = 0.022*	p = 0.005*
Station (Sediment profile)	df = 6	df = 6	df = 6	df = 6
	MS = 0.017	MS = 0.189	MS = 0.055	MS = 0.001
	F = 0.608	F = 1.160	F = 2.610	F = 1.324
	p = 0.721	p = 0.370	p = 0.053	p = 0.297
Sampling period (Station-Sediment profile)	df = 18	df = 18	df = 18	df = 18
	MS = 0.027	MS = 0.163	MS = 0.021	MS = 0.001
	F = 1.417	F = 3.489	F = 1.141	F = 2.794
	p = 0.162	p = 0.001*	p = 0.342	p = 0.002*

Summary of results of three-way ANOVA considering species number (S), species abundance (N) and Hill’s diversity indices (N1 and N21) for factors sediment profile (effect of different sediment layers-three levels: 0–5 cm, 5–10 cm and 10–20 cm down through the sediment), station (spatial effect-three levels: station IP-10, IP-17 and IP-38) and sampling period (temporal effect-three levels: prior to trawling period, 30 and 120 days after intense bottom trawling period) (asterisk denotes statistically significant results).

ISSN: 2241-5793