Table 5.

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

SpeciesN clipsn pointsy-interceptSloper2F-ratio
Camarhynchus parvulus 7203-18.3826.750.1331.12***
Camarhynchus parvulus 7153-12.9011.600.1628.62***
Camarhynchus parvulus 260-17.067.180.053.02NS
Camarhynchus parvulus 241-13.9621.600.2612.66*
Camarhynchus parvulus 227-18.0338.130.144.22NS
Camarhynchus parvulus 132-33.6126.010.80123.03***
Camarhynchus parvulus 131-16.559.590.030.90NS
Camarhynchus parvulus 114-7.09-6.710.010.09NS
Camarhynchus parvulus 112-11.7810.740.030.29NS
Camarhynchus psittacula 230-17.0813.670.4724.80***
Camarhynchus psittacula 113-21.9419.030.314.93NS
Certhidea olivacea 464-15.9215.340.2419.15***
Certhidea olivacea 111-3.49-9.670.222.58NS
Geospiza fortis 12269-10.946.580.026.20NS
Geospiza fortis 9172-15.39-15.390.047.70NS
Geospiza fortis 8178-14.8514.400.2351.10***
Geospiza fortis 8156-9.750.870.000.05NS
Geospiza fortis 7112-16.7723.690.1011.99*
Geospiza fortis 5153-9.50-4.170.011.52NS
Geospiza fortis 5125-12.793.960.056.21NS
Geospiza fortis 5119-9.11-0.200.000.01NS
Geospiza fortis 496-13.044.190.011.05NS
Geospiza fortis 484-3.24-13.450.109.38NS
Geospiza fortis 471-13.774.830.042.55NS
Geospiza fortis 3100-8.14-10.770.055.42NS
Geospiza fortis 374-12.0412.470.1614.08**
Geospiza fortis 367-10.9513.830.128.98NS
Geospiza fortis 366-23.9059.670.3534.24***
Geospiza fortis 356-14.9520.300.3124.48***
Geospiza fortis 339-11.1114.390.103.94NS
Geospiza fortis 262-18.0129.420.095.99NS
Geospiza fortis 234-6.01-2.560.020.61NS
Geospiza fortis 247-16.6425.550.3221.26***
Geospiza fortis 237-9.455.440.020.63NS
Geospiza fortis 133-14.529.550.207.65NS
Geospiza fortis 131-8.940.130.000.00NS
Geospiza fortis 127-3.58-7.740.164.69NS
Geospiza fortis 126-2.18-8.310.205.86NS
Geospiza fortis 124-10.675.690.051.08NS
Geospiza fortis 124-17.5312.160.133.17NS
Geospiza fortis 119-27.4428.230.204.35NS
Geospiza fortis 119-16.028.500.122.41NS
Geospiza fortis 117-0.37-11.730.091.41NS
Geospiza fortis 115-15.908.110.040.66NS
Geospiza fortis 114-24.8730.490.223.38NS
Geospiza fortis 112-11.021.820.000.00NS
Geospiza fortis 111-4.60-16.050.202.21NS
Geospiza fuliginosa 5158-16.2116.850.011.83NS
Geospiza fuliginosa 4137-22.5224.060.3367.85***
Geospiza fuliginosa 123-44.0569.140.7459.17***
Geospiza fuliginosa 115-34.81202.580.7132.17***
Geospiza fuliginosa 113-16.5250.060.223.16NS
Geospiza magnirostris 5109-20.0713.370.1316.13***
Geospiza magnirostris 119-4.86-4.500.122.29NS
Geospiza magnirostris 116-15.1619.970.295.77NS
Platyspiza crassirostris 344-18.4725.910.5959.36***
  • Number of data points after removal of outliers

  • * P<0.05

  • ** P<0.01

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

  • NS , not significant