Greece
409
Fig. 17.5. Seasonal fluctuation of Prorocentrum micans in relation to depths. (Seferlis
1990)
Table 17.2. Monthly physical and chemical data from Thermaikos Gulf in the period May 1988April 1989. (Nikolaidis and Moustaka-Gouni 1990)
Year
1988
1989
Month
M
A
S
°
N
D
F
M
A
Temperature (0C)
21
24
26
27
22
18
14
11
10
11
13
17
Secchi depth (m)
1.5
3.2
4.4
3.8
3.0
3.2
2.6
4.0
3.0
3.2
2.4
2.2
Salinity (PSU)
24.5 28.5 31.6 33.3 31.5 31.4 31.4 34.5 34.0 32.5 32.0 30.5
pH
8.2
8.2
8.2
8.1
8.2
8.4
8.1
8.2
8.1
8.2
8.3
8.3
Inorg.nitrogen
3.2
3.0
3.0
4.5
5.0
3.2
7.2
8.2
1.8
3.7
4.4
2.3
(I!mol dm - 3)
P0 4 -P (I!mol dm- 3 ) 0.5
0.9
0.6
0.6
0.3
2.3
0.5
1.1
0.7
2.6
2.8
2.2
Si0 2 -Si (I!mol dm - 3) 2.6
6.9
0.8
5.5 13.4
1.1
1.4
7.5
1.0
4.6
0.3
4.4
Axios and Aliakmonas as a result of extensive use of river water for
irrigation during the summer months. All the eutrophicating substances
flowing into the Gulf and their annual cycling are given in the detailed
studies by Nikolaidis and Moustaka-Gouni (1990, 1992).