Table 2.

Regression analyses for frequency data pooled by individuals (x-axis=cm, y-axis=Hz)

SpeciesN clipsn pointsy-interceptSloper2F-ratio
Camarhynchus parvulus 7203335011110.0919.56***
Camarhynchus parvulus 7153243342260.51159.06***
Camarhynchus parvulus 260294533020.5983.18***
Camarhynchus parvulus 241211639300.5751.26***
Camarhynchus parvulus 227205455410.258.37 NS
Camarhynchus parvulus 132470912400.2912.22*
Camarhynchus parvulus 131326512990.165.61 NS
Camarhynchus parvulus 11432673270.020.26 NS
Camarhynchus parvulus 1123677-17440.101.06 NS
Camarhynchus psittacula 231178940890.5129.92***
Camarhynchus psittacula 113265041010.397.12 NS
Certhidea olivacea 466437723700.3534.33***
Certhidea olivacea 111479614630.131.38 NS
Geospiza fortis 1226725043740.0411.99*
Geospiza fortis 916824875410.1735.02***
Geospiza fortis 8181168242560.65326.57***
Geospiza fortis 8153225122260.1731.74***
Geospiza fortis 7114237811600.1113.36**
Geospiza fortis 5156181618150.3581.14***
Geospiza fortis 5125226722210.4082.93***
Geospiza fortis 511630702120.010.96 NS
Geospiza fortis 493175442690.53102.62***
Geospiza fortis 484197529580.4361.13***
Geospiza fortis 472234634220.61109.03***
Geospiza fortis 398231227660.2734.67***
Geospiza fortis 373208824880.69158.88***
Geospiza fortis 368217627820.4656.10***
Geospiza fortis 366252411080.074.45 NS
Geospiza fortis 356223014030.4544.37***
Geospiza fortis 3392755-3910.145.81 NS
Geospiza fortis 2632679350.000.02 NS
Geospiza fortis 262191321350.2621.14***
Geospiza fortis 246231710620.136.56 NS
Geospiza fortis 237224425790.5849.09***
Geospiza fortis 133103831180.89260.15***
Geospiza fortis 131139640840.7169.58***
Geospiza fortis 126238817670.3915.03*
Geospiza fortis 126219137140.4821.88***
Geospiza fortis 125185426480.7467.12***
Geospiza fortis 124210222400.5931.33***
Geospiza fortis 11924039290.245.21 NS
Geospiza fortis 119180237580.7243.62***
Geospiza fortis 117-26176130.8374.56***
Geospiza fortis 115195414620.6827.58***
Geospiza fortis 114230610640.141.99 NS
Geospiza fortis 112879920.5512.35 NS
Geospiza fortis 111219334360.6819.41*
Geospiza fuliginosa 5154268435980.1017.17***
Geospiza fuliginosa 4126285833280.77425.00***
Geospiza fuliginosa 123403111800.030.63 NS
Geospiza fuliginosa 116292345450.399.09 NS
Geospiza fuliginosa 113197912 2510.6721.92*
Geospiza magnirostris 5109197625670.2026.87***
Geospiza magnirostris 1193369-3990.040.75 NS
Geospiza magnirostris 11623866480.091.38 NS
Platyspiza crassirostris 327314534070.6037.52***
  • Number of data points after removal of outliers

  • Example songs and gape profiles for these birds are illustrated in Figs 1, 2, 3, 4

  • * P<0.05

  • ** P<0.01

  • *** P<0.005 (significance after Bonferroni correction)

  • NS , not significant