Table 7.
Fitted means and standard errors of the frequency of each social behaviour depending on enrichment for Yangtze finless porpoises (YFPs), East-Asian finless porpoises (EAFPs) and bottlenose dolphins (BDs). Outputs come from Wald chi-squared tests run on Generalized linear mixed models, significant outputs are bolded. For each species and each behaviour, items sharing the same letter did not differ significantly, items that do not share the same letter differ significantly (post-hoc tests with sequential Bonferroni correction).
| Species | YFPs | EAFPs | BDs | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Enrichment | None | Toy(s) | Human(s) | Human(s) and Toy(s) | Fish | None | Toy(s) | Human(s) | New Object | None | Toy(s) | Human(s) | Human(s) and Toy(s) | |
| Left Pectoral Contact | Mean | 1.15 | 1.14 | 1.14 | 1.06 | 1.10 | 2.11 | 2.54 | 5.84 | 7.70 | 1.01 | 1.02 | 1.00 | 1.01 |
| SE | 3.00 | 2.77 | 2.67 | 1.14 | 2.06 | 0.37 | 0.46 | 0.88 | 1.16 | 1.28 | 1.76 | 0.26 | 0.66 | |
| Output | χ² = 6.16, df = 4, p = 0.192 | χ² = 116.95, df = 3, p < 0.001 | χ² = 12.27, df = 3, p = 0.007 | |||||||||||
| Pairwise | b | ab | a | ab | a | ab | b | ab | ||||||
| Right Pectoral Contact | Mean | 1.23 | 1.18 | 1.21 | 1.06 | 1.14 | 1.99 | 2.73 | 5.86 | 2.91 | 1.02 | 1.01 | 1.03 | 1.01 |
| SE | 0.15 | 0.12 | 0.14 | 0.06 | 0.10 | 0.40 | 0.57 | 1.01 | 0.67 | 0.01 | 0.01 | 0.01 | 0.01 | |
| Output | χ² = 11.78, df = 4, p = 0.019 | χ² = 109.24, df = 3, p < 0.001 | χ² = 4.46, df = 3, p = 0.216 | |||||||||||
| Pairwise | a | ab | ab | b | b | b | ab | a | ab | |||||
| Other Body Contact | Mean | 1.01 | 1.01 | 1.01 | 1.00 | 1.07 | 7.57 | 5.38 | 17.32 | 2.85 | 1.01 | 1.01 | 1.00 | 1.01 |
| SE | 0.22 | 0.31 | 0.30 | 0.01 | 2.66 | 0.34 | 0.26 | 0.50 | 0.40 | 0.78 | 0.94 | 0.27 | 0.75 | |
| Output | χ² = 9.08, df = 4, p = 0.591 | χ² = 30.51, df = 3, p < 0.001 | χ² = 5.01, df = 3, p = 0.025 | |||||||||||
| Pairwise | b | a | a | ab | b | a | c | abc | ||||||
| Agonistic | Mean | 1.11 | 1.14 | 1.17 | 1.20 | 1.10 | 3.05 | 4.08 | 4.27 | 2.78 | 1.31 | 1.28 | 1.42 | 1.15 |
| SE | 3.40 | 4.30 | 5.07 | 5.97 | 3.04 | 0.18 | 0.21 | 0.24 | 0.33 | 0.13 | 0.12 | 0.17 | 0.07 | |
| Output | χ² = 5.16, df = 4, p = 0.023 | χ² = 10.02, df = 3, p = 0.018 | χ² = 7.53, df = 3, p = 0.006 | |||||||||||
| Pairwise | b | a | a | ab | ab | b | a | abc | c | a | ab | ab | b | |
| Socio-Sexual | Mean | 1.10 | 1.08 | 1.20 | 1.07 | 1.06 | 5.32 | 6.78 | 7.15 | 27.99 | 1.67 | 1.59 | 1.38 | 1.40 |
| SE | 10.13 | 7.75 | 19.27 | 7.52 | 6.45 | 1.55 | 1.94 | 2.10 | 11.55 | 0.32 | 0.30 | 0.21 | 0.22 | |
| Output | χ² = 6.51, df = 4, p = 0.011 | χ² = 38.51, df = 3, p < 0.001 | χ² = 20.51, df = 3, p < 0.001 | |||||||||||
| Pairwise | a | ab | ab | ab | b | b | a | a | a | a | ab | b | ab | |
| Social Play | Mean | NA | NA | 1.31 | 1.47 | 1.18 | 1.32 | |||||||
| SE | 0.10 | 0.14 | 0.07 | 0.11 | ||||||||||
| Output | χ² = 4.42, df = 3, p = 0.035 | |||||||||||||
| Pairwise | b | a | c | abc | ||||||||||