Table 3.
Outcome of a Multiple Response Permutation Procedure (MRPP) that was used to calculate the dissimilarities in offspring investment (trip duration, total distance travelled, flying and foraging) and self-maintenance (time allocated to resting outside the colony) within and between pairs
| Trip parameters | Within pairs | Between pairs | Observed delta | Expected delta |
|---|---|---|---|---|
| VL | ||||
| Total distance (km) | 0.223 | 0.252 | 7.133 | 7.895 |
| Trip duration (h) | 0.296 | 0.368 | 91.980 | 108.800 |
| Resting (h) | 0.231 | 0.266 | 3.117 | 3.481 |
| Flying (h) | 0.300 | 0.356 | 2.998 | 3.435 |
| Foraging (h) | 0.454 | 0.528 | 2.699 | 3.273 |
| ZB | ||||
| Total distance (km) | 0.281 | 0.301 | 8.468 | 9.123 |
| Trip duration (h) | 0.349 | 0.404 | 96.820 | 112.000 |
| Resting (h) | 0.274 | 0.292 | 3.479 | 3.719 |
| Flying (h) | 0.352 | 0.403 | 3.264 | 3.754 |
| Foraging (h) | 0.490 | 0.538 | 3.395 | 3.849 |
Dissimilarities are calculated separately for the two colonies [Vlissingen: VL (N = 12 pairs), Zeebrugge: ZB (N = 13 pairs)]. Observed delta is the overall weighted mean of group mean distances. Expected delta is the mean of original dissimilarities, under the null hypothesis of no group structure. Significance of delta is < 0.001 for all parameters