Tidal Influence on Nutrients Status and Phytoplankton Population of Okpoka Creek, Upper Bonny Estuary, Nigeria

Table 1

Important values assigned to ith species abundance.

Range	Importance value
1–10	1
11–20	2
21–30	3
31–40	4
41–50	5
51–60	6
61–70	7
71–80	8
81–90	9
91–100	10
100 and above	11