Table 5.

Fitted means and standard errors of the frequency of each social behaviour, depending on social grouping for Yangtze finless porpoises (YFPs) 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		BDs
Social Grouping		Altogether	Separated	Altogether	Separated
Left Pectoral Contact	Mean	1.16	1.15	1.02	1.01
	SE	3.16	2.93	2.29	1.00
	Output	χ² = 8.79, df = 1, p = 0.012		χ² = 19.25, df = 1, p < 0.001
	Pairwise	a	b	a	b
Right Pectoral Contact	Mean	1.29	1.20	1.05	1.01
	SE	0.19	0.13	0.02	0.00
	Output	χ² = 28.26, df = 1, p < 0.001		χ² = 11.68, df = 1, p < 0.001
	Pairwise	a	b	a	b
Other Body Contact	Mean	1.01	1.01	1.33	1.01
	SE	0.34	0.20	2.33	0.40
	Output	χ² = 2.04, df = 1, p = 0.154		χ² = 63.94, df = 1, p < 0.001
	Pairwise			a	b
Agonistic	Mean	1.12	1.11	1.47	1.27
	SE	3.65	3.33	0.18	0.11
	Output	χ² = 11.50, df = 1, p = 0.003		χ² = 19.76, df = 1, p < 0.001
	Pairwise	a	b	a	b
Socio-Sexual	Mean	1.21	1.07	1.97	1.56
	SE	19.93	7.29	0.43	0.28
	Output	χ² = 49.92, df = 1, p < 0.001		χ² = 8.28, df = 1, p = 0.004
	Pairwise	a	b	a	b
Social Play	Mean	NA		2.58	1.24
	SE			0.34	0.08
	Output			χ² = 230.07, df = 1, p < 0.001
	Pairwise			a	b