1. 2SAMPATH KUMAR. S., 2HARIPRASAD. P and 1RAMAKRISHNAN. N
STUDY ON THE EFFECT OF SOME SELECTED HEAVY METALS ON THE PRIMARY PRODUCTION IN FRESH WATER POND AT TIRUVANNAMALAI, TAMIL NADU.
2SAMPATH KUMAR. S., 2HARIPRASAD. P and 1RAMAKRISHNAN. N
Department of Natural Science, Govt. Arts College, Tiruvannamalai- 3, Tamil Nadu

2. Location of the Study Site
The experimental ponds selected for this study are situated inTiruvannamalai (12o 15’ NL and 79o 07’ EL). Both the ponds are eutrophic in nature with a dominance of Cyanophyceae during the study period.

4. HEAVY METAL
The following four heavy metals were selected Lead (Pb), Copper (Cu), Cadmium (Cd) and Zinc (Zn) for the present investigation. The GR - grade of various metal salts used were lead nitrate, Copper Sulphate, Cadmium chloride and zinc chloride.

5. A total of 61 algal taxa were identified in the pond I and 71 taxa were identified from the pond II, which were distributed over four classes of algal divisions such as Chlorophyta, Bacillariophyta, Euglenophyta and Cyanophyta.

6. The physicochemical characters of the water bodies during the experimental period
Parameters
POND I
POND II
First exp. Results
Second exp. Results
Water Temp.
28.10
28.65
29.21
28.5 PH
8.1
8.21
7.85
7.65
Transparency
20.65
21.25
19.85
20.2
DO2
19.7
20.6
18.8
21.5
Total solids
110.5
96.2
88.65
92.8
Total alkalinity
126.5
132.6
128.5
130.6
Calcium
18.25
16.5
25.2
24.2
Magnesium
19.6
22.65
20.35
21.6
Silicate
6.45
5.8
7.2
6.1
Phosphate
5.1
4.8
5.3
4.3

7. PHYTOPLANKTON DIVERSITY IN MAJOR ALGAL DIVISIONS DURING THE EXPERIMENT IN POND I

8. PHYTOPLANKTON DIVERSITY IN MAJOR ALGAL DIVISIONS DURING THE EXPERIMENT IN POND II

9. PHYTOPLANKTON DENSITY DURING THE EXPERIMENT PERIOD

10. EFFECT OF ZINC ON GPP

11. EFFECT OF CADMIUM ON GPP

12. EFFECT OF LEAD ON GPP

13. EFFECT OF DIFFERENT CONCENTRATIONS OF COPPER ON GPP (mgC/m3/hr)

14. EFFECT OF VARIOUS CONCENTRATIONS OF HEAVY METALS ON COMMUNITY NPP IN POND I

15. EFFECT OF VARIOUS CONCENTRATIONS OF HEAVY METALS ON COMMUNITY NPP IN POND II

16. Correlation matrix between the heavy metal effect on GPP in the Pond I and II
Variable
ZN_PII
CD_PII
PB_PII
CU_PII
ZN_PI
CD_PI
PB_PI
CU_PI
1.0000
.98630
.98750
.98991
.98271
.97402
.99351
.99646
.98349
.98607
.98635
.97538
.97036
.96968
.95357
.96209
.98526
.98091
.99592
.99864
.98812
.95929
.98727
.98621
.99719
.99622
.99030
.96414
.99904
ZN_PII – Effect of Zinc on GPP in Pond II; CD_PII – Effect of Cadmium on GPP in Pond II
PB_PII – Effect of Lead on GPP in Pond II; CU_PII – Effect of Cupper on GPP in Pond II
ZN_PI – Effect of Zinc on GPP in Pond I; CD_PI – Effect of Cadmium on GPP in Pond I
PB_PI – Effect of Lead on GPP in Pond II; CU_PI – Effect of Cupper on GPP in Pond I

17. Thank you.