Table 2.
Results of GLMs of the association between the acoustic properties of reconstructed soundscapes and the number of individuals (1–10) and species (2,3,4,5,10,20,50) present in a simulated community and contributing to that soundscape.
| Fixed effects | North America | Europe | |||||
|---|---|---|---|---|---|---|---|
| Estimate (SE) | t | p | Estimate (SE) | t | p | ||
| (a) ADI | (Intercept) | 1.866 (0.011) | 175.12 | <0.001 | 1.856 (0.008) | 222.38 | <0.001 |
| Log(Individuals) | 0.034 (0.006) | 5.35 | <0.001 | 0.028 (0.005) | 5.66 | <0.001 | |
| Log(Species) | 0.056 (0.005) | 11.85 | <0.001 | 0.047 (0.004) | 12.57 | <0.001 | |
| Log(Individuals)*Log(species) | −0.007 (0.003) | −2.61 | 0.011 | −0.005 (0.002) | −2.13 | 0.037 | |
| (b) AEI | (Intercept) | 0.461 (0.003) | 148.60 | <0.001 | 0.472 (0.002) | 203.68 | <0.001 |
| Log(Individuals) | −0.012 (0.001) | −8.30 | <0.001 | −0.012 (0.001) | −10.88 | <0.001 | |
| Log(Species) | −0.029 (0.001) | −29.67 | <0.001 | −0.027 (0.001) | −37.18 | <0.001 | |
| (c) BI | (Intercept) | 107.09 (0.662) | 161.84 | <0.001 | 104.53 (0.651) | 160.46 | <0.001 |
| Log(Individuals) | 3.913 (0.398) | 9.83 | <0.001 | 4.367 (0.392) | 11.15 | <0.001 | |
| Log(Species) | 4.299 (0.293) | 14.69 | <0.001 | 4.49 (0.288) | 15.59 | <0.001 | |
| Log(Individuals)*Log(species) | −1.103 (0.176) | −6.27 | <0.001 | −1.170 (0.173) | −6.75 | <0.001 | |
| (d) H | (Intercept) | 0.639 (0.006) | 102.04 | <0.001 | 0.643 (0.006) | 108.93 | <0.001 |
| Log(Individuals) | 0.058 (0.004) | 15.33 | <0.001 | 0.056 (0.004) | 15.77 | <0.001 | |
| Log(Species) | 0.049 (0.003) | 18.05 | <0.001 | 0.050 (0.003) | 18.39 | <0.001 | |
| Log(Individuals)*Log(species) | −0.014 (0.002) | −8.59 | <0.001 | −0.014 (0.002) | −8.73 | <0.001 | |
(a) Acoustic Diversity Index (ADI), (b) Acoustic Evenness Index (AEI), (c) Bioacoustic Index (BI) and (d) Acoustic Entropy (H). Separate models for North American (left column) and European (right column) species presented. Only significant interactions are retained.