Variation in total jet encounters and response type with location of contact point on the body
| Parameter . | Total . | U. halleri . | P. violacea . | M. californica . |
|---|---|---|---|---|
| Intercept | 5.137*** (0.081) | 3.754*** (0.120) | 5.342*** (0.082) | 4.094*** (0.131) |
| Y-intercept 1 vs 3 | –0.681*** (0.121) | 0.702*** (0.150) | 0.208 (0.106) | 1.043*** (0.154) |
| Y-intercept 2 vs 3 | 0.413*** (0.106) | 0.076 (0.182) | –1.285*** (0.149) | 0.615*** (0.167) |
| Y-intercept 1 vs 2 | –1.094*** (0.113) | 0.626*** (0.164) | 1.493*** (0.142) | 0.428** (0.132) |
| Slope 1 vs 3 | 0.144*** (0.027) | –0.044 (0.028) | 0.058* (0.029) | –0.033 (0.038) |
| Slope 2 vs 3 | –0.047 (0.027) | –0.119** (0.037) | 0.160*** (0.036) | –0.055 (0.041) |
| Slope 1 vs 2 | 0.192*** (0.025) | 0.075* (0.034) | –0.102** (0.032) | 0.022 (0.034) |
| Distance from body midline | –0.280*** (0.020) | –0.091*** (0.022) | –0.385*** (0.023) | –0.247*** (0.032) |
| Parameter . | Total . | U. halleri . | P. violacea . | M. californica . |
|---|---|---|---|---|
| Intercept | 5.137*** (0.081) | 3.754*** (0.120) | 5.342*** (0.082) | 4.094*** (0.131) |
| Y-intercept 1 vs 3 | –0.681*** (0.121) | 0.702*** (0.150) | 0.208 (0.106) | 1.043*** (0.154) |
| Y-intercept 2 vs 3 | 0.413*** (0.106) | 0.076 (0.182) | –1.285*** (0.149) | 0.615*** (0.167) |
| Y-intercept 1 vs 2 | –1.094*** (0.113) | 0.626*** (0.164) | 1.493*** (0.142) | 0.428** (0.132) |
| Slope 1 vs 3 | 0.144*** (0.027) | –0.044 (0.028) | 0.058* (0.029) | –0.033 (0.038) |
| Slope 2 vs 3 | –0.047 (0.027) | –0.119** (0.037) | 0.160*** (0.036) | –0.055 (0.041) |
| Slope 1 vs 2 | 0.192*** (0.025) | 0.075* (0.034) | –0.102** (0.032) | 0.022 (0.034) |
| Distance from body midline | –0.280*** (0.020) | –0.091*** (0.022) | –0.385*** (0.023) | –0.247*** (0.032) |
The `total' column compares the linear trends of the total number of water jet encounters by percentage distance from the midline (see Fig. 4) between the three species, 1=Urobatis halleri, 2=Pteroplatytrygon violacea,3=Myliobatis californica. Columns labeled with species names compare the linear trends for the total number of jet encounters, positive responses and no responses with percentage distance from the midline (1=total encounters, 2=positive responses, 3=no response, within each species; see Fig. 4). Estimates from the Poisson regression are given with s.e.m. in parentheses. The intercept estimate shown uses 3 as the reference for each column with the exception of the 1 vs 2 comparisons (*P<0.05, **P<0.01, ***P<0.001)