Table 3 Experimental life-history traits of resistant (R: La Palma and La Coca) and susceptible (S: Aurora and Negrines) Pseudosuccinea columella at different pH and total hardness (TH) conditions (ex: life expectancy, mx: fecundity rate, NHS within one week: snails that hatched within one week after egg laying, Ro: net reproductive rate, FR: week at first reproduction, r: intrinsic rate of natural increase, λ: finite rate of natural increase.

From: Patterns of distribution, population genetics and ecological requirements of field-occurring resistant and susceptible Pseudosuccinea columella snails to Fasciola hepatica in Cuba

Condition(pH/TH)

Strain

Age-dependent traits

Age-independent traits

NHS within one week (%)

Viable eggs (%)

W0

W5

W9

W14

ex

ex

mx

ex

mx

ex

mx

FR

Ro

r

λ

5.9/4°d

La PalmaR

10.9

5.9

0.7

3.7

12.7

2.3

115.5

4

37.4

0.72

2.06

72.9

99.37

La CocaR

10.3

5.3

0.6

5.5

27.8

6.1

96.7

5

116.8

0.79

2.20

68.4*

96.46

AuroraS

7.9

2.9

1.5

5.0

76.5

1.5

147.0

4

37.8

0.73

2.06

53.9*

95.4*

NegrinesS

4.4

4.4

25.0

3.3

28.0

—

—

4

19.2

0.59

1.80

64.8*

67.5*

7.6/14°d

La PalmaR

8.6

6.7

1.1

4.0

5.3

2.2

56

3

45.1

0.95

2.59

71.5

98.3

La CocaR

17.4

13.8

0.2

9.8

0.7

5.0

10.6

4

56.9

0.81

2.24

97.4*

98.7

AuroraS

12.1

7.6

0.8

5.0

2.6

2.7

33.4

3

56.4

1.00

2.74

92.5*

96.6*

NegrinesS

12.7

8.9

0.3

5.2

0.3

2.5

20.4

4

21.8

0.62

1.85

87.6*

99.2*

  1. Data corresponds to weeks (W) 0, 5, 9 and 14. The (*) represents significant differences (P <0.05) for each population when comparing the given trait between experimental settings by Fisher’s Exact Tests.
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