Table 2.

Factor loadings from Principal Components analysis of acoustic parameter measures from contact calls of three vocal dialects

	South Dialect					North Dialect					Nicaraguan Dialect
Measurements	PCA 1	PCA 2	PCA 3	PCA 4	PCA 5	PCA 1	PCA 2	PCA 3	PCA 4	PCA 5	PCA 1	PCA 2	PCA 3	PCA 4	PCA 5
total note duration (ms)	0.97	−0.02	−0.10	−0.13	−0.02	0.043	−1.00	0.03	0.02	−0.04	0.03	0.98	−0.06	0.05	−0.13
first segment duration (ms)	0.81	0.04	−0.11	−0.29	−0.06	−0.20	−0.78	0.22	−0.18	0.13	0.36	0.87	0.00	0.06	−0.04
second segment duration (ms)	0.58	−0.13	0.45	0.32	0.07	0.28	−0.68	−0.20	0.22	−0.21	−0.43	0.77	−0.11	0.01	−0.21
first segment high freq. (Hz)	0.08	−0.05	0.07	−0.78	0.59	0.21	−0.06	0.89	0.26	−0.10	0.87	0.13	0.02	−0.09	−0.43
first segment low freq. (Hz)	−0.10	−0.05	−0.01	0.03	0.96	0.28	−0.03	−0.11	0.82	−0.08	0.95	0.01	0.02	−0.09	0.04
first segment freq. range (Hz)	0.19	−0.01	0.09	−0.90	−0.24	−0.03	−0.03	0.88	−0.41	−0.02	0.34	0.24	0.01	−0.04	−0.90
second segment high freq. (Hz)	−0.08	−0.11	0.91	−0.03	0.07	0.87	−0.02	0.10	0.37	0.03	0.92	0.16	0.00	−0.16	−0.23
second segment low freq. (Hz)	−0.01	0.85	0.48	0.03	−0.01	−0.11	0.02	0.03	0.87	0.08	0.85	−0.26	0.10	−0.10	−0.12
second segment freq. range (Hz)	−0.04	−0.96	0.13	−0.06	0.06	0.97	−0.03	0.08	−0.15	−0.02	0.68	0.47	−0.08	−0.15	−0.25
first segment peak freq. (Hz)	0.14	−0.50	0.07	0.12	0.47	−0.05	0.02	−0.11	0.11	0.73	0.03	−0.09	0.98	−0.13	0.00
second segment peak freq. (Hz)	−0.16	0.25	0.81	−0.12	−0.05	0.054	0.02	0.02	−0.09	0.80	0.23	−0.08	0.14	−0.95	−0.04
Eigenvalue	2.48	2.16	1.82	1.25	1.21	2.56	2.16	1.98	1.44	1.20	4.86	2.80	1.07	0.70	0.68
Variation explained (%)	23.3	19.6	18.0	13.1	10.9	22.5	19.6	16.5	11.4	11.0	44.2	25.5	9.8	6.4	6.2
Total variation explained (%)			85					81					92