Table 3.
Behaviour responses (percentage) of pre-spawn sea lamprey to treatments. Treatments: 3-keto petromyzonol sulfate (3kPZS, dissolved in 50% methanol), extracted water conditioned with larvae (larval extract, dissolved in 50% methanol) and control (vehicle, 50% methanol). Response variables: percentage swimming upstream (upstream), percentage entering the subchannel containing each treatment (treatment channel) and the percentage entering within proximity of the treatment source (treatment source). Different lower-case letters within each response variable within each sex indicate statistical differences (logistic regression; α=0.05).
| sex | treatment | trials | released (N) | upstream (n) | treatment channel (n) | treatment source (n) |
|---|---|---|---|---|---|---|
| female | control | 27 | 617 | 55% (342) a | 50% (171) a | 15% (25) a |
| female | larval extract | 6 | 140 | 85% (119) b | 86% (102) b | 61% (62) b |
| female | 3kPZS | 22 | 489 | 71% (346) c | 42% (146) a | 18% (27) a |
| χ2 | 59.56 | 67.03 | 53.21 | |||
| d.f. | 2 | 2 | 2 | |||
| P-value | <0.001 | <0.001 | <0.001 | |||
| male | control | 7 | 140 | 64% (90) a | 46% (41) a | 76% (31) a |
| male | larval extract | 5 | 100 | 83% (83) b | 71% (59) b | 90% (53) a |
| male | 3kPZS | 6 | 120 | 72% (86) a | 55% (47) a | 77% (36) a |
| χ2 | 10.58 | 11.94 | 4.72 | |||
| d.f. | 2 | 2 | 2 | |||
| p-value | 0.005 | 0.003 | 0.095 |