Argonauta 1-6 2010





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Table1. Toxicity (LC50 values) of ASBME and LIBME against freshwater snail Lymnaea acuminata at different time intervals in pond.

 

Exposure periods

Effective dose (mg/L)

Limits (mg/L)

Slope value

‘t’ ratio

Hetero-geneity

LCL

UCL

Alstonia scholaris methanol extract

24h

LC50 = 55.19

47.67

70.06

2.19±0.36

6.01

0.50

48h

LC50 = 40.29

36.40

45.22

2.65±0.35

7.38

0.55

72h

LC50 = 31.48

26.64

36.00

1.96±0.34

5.71

0.14

96h

LC50 = 23.20

9.73

30.38

2.45±0.36

6.82

0.10

Lantana indica methanol extract

24h

LC50 = 41.28

34.18

57.75

1.71±0.32

5.33

0.46

48h

LC50 = 30.35

25.88

37.73

1.66±0.31

5.35

0.11

72h

LC50 = 21.38

18.15

24.48

1.96±0.31

6.32

0.38

96h

LC50 = 14.73

6.92

19.43

2.52±0.33

7.61

0.10

 

·        Hundred snails were exposed to four different concentrations of the extract.

·        Concentrations given are the final concentration (w/v) in the de-chlorinated water.

·        Mortality was determined at every 24h.

·        Regression coefficient showed that there was significant (P<0.05) negative

·        Regression between exposure time and different LC values.

·        LCL-Lower confidence limit; UCL-Upper confidence limit.

·        There was no mortality in control group.

 

 

Table2. Toxicity (LC50 values) of binary mixture of LIBME +ASBME against freshwater snail Lymnaea acuminata at different time intervals in pond.

 

Exposure periods

Effective dose (mg/L)

Limits (mg/L)

Slope value

‘t’ ratio

Hetero-geneity

LCL

UCL

Lantana indica+Alstonia scholaris  Mthanol (1:5 ratio)

24h

LC50 = 28.53

27.56

30.24

9.31±1.63

5.70

0.19

48h

LC50 = 27.02

26.28

28.01

9.76±1.59

6.10

0.81

72h

LC50 = 24.86

23.79

25.66

8.33±1.57

5.29

0.02

96h

LC50 = 23.65

22.87

24.23

13.73±1.74

7.88

0.22

Lantana indica+Alstonia scholaris  Methanol (1:1 ratio)

24h

LC50 = 22.76

21.74

24.62

7.25±1.26

5.73

0.39

48h

LC50 = 20.59

19.77

21.65

6.50±1.21

5.37

0.89

72h

LC50 = 18.87

17.92

19.61

6.87±1.21

5.67

0.23

96h

LC50 = 17.78

16.96

18.38

9.65±1.29

7.43

0.84

Other details are given in Table 1.