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Table 1.

The mean (±s.e.m.) number of pneumostome openings, total breathing time and mean breathing time of snails from each of the four populations

PopulationNMean ± s.e.m.
Number of pneumostome openings Wild Belly 14 8.29±1.495 
 Belly F1 15 6.93±1.422 
 Wild Dutch 12 8.92±1.598 
 Lab Dutch 15 8.53±0.729 
Total breathing time (s) Wild Belly 14 230.50±44.178 
 Belly F1 15 175.40±24.733 
 Wild Dutch 12 237.17±19.472 
 Lab Dutch 15 222.13±31.191 
Mean breathing time (s) Wild Belly 14 28.14±4.309 
 Belly F1 15 22.27±3.517 
 Wild Dutch 12 32.92±5.336 
 Lab Dutch 15 26.20±2.196 
PopulationNMean ± s.e.m.
Number of pneumostome openings Wild Belly 14 8.29±1.495 
 Belly F1 15 6.93±1.422 
 Wild Dutch 12 8.92±1.598 
 Lab Dutch 15 8.53±0.729 
Total breathing time (s) Wild Belly 14 230.50±44.178 
 Belly F1 15 175.40±24.733 
 Wild Dutch 12 237.17±19.472 
 Lab Dutch 15 222.13±31.191 
Mean breathing time (s) Wild Belly 14 28.14±4.309 
 Belly F1 15 22.27±3.517 
 Wild Dutch 12 32.92±5.336 
 Lab Dutch 15 26.20±2.196 

No significant difference was found between any populations for each of the measures of breathing characterized

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