Parameter

1969-1984 (Mean (SD)

1985-2000 (mean (SD)

p value (S = Significant; NS = Not Significant

Cyanophyta

(g(ww)/m²)

3.0 (4.4)

4.3 (8.0)

0.0387 S

Diatoms

(g(ww)/m²)

4.4 (12.0)

12.8 (32.3)

0.0007 S

Chlorophyta

(g(ww)/m²)

8.0 (6.3)

14.1 (14.0)

<0.0001 S

Peridinium

(g(ww)/m²)

49.2 (70)

55.7 (79)

0.3888 NS

Total Phytoplankton

(g(ww)/m²)

65.7 (68.1)

87.2 (79.0)

0.0044 S

Non-Pyrrhophyta

(g(ww)/m²)

15.3 (16.9)

31.5 (38.9)

<0.0001 S

Secchi Depth (m)

3.04 (0.88)

3.36 (0.74)

0.0005 S

Chlorophyll (mg/m²)

202.2 (151.4)

207.1 (198.5)

0.8146 NS

PP (gC/m²/month)

49.7 (21.5)

53.4 (24.0)

0.1603 NS

DO (0 - 10 m) ppm

8.5 (1.9)

9.4 (2.1)

0.0003 S