Fig. 3: Temporal trends in acoustic indices. | Nature Communications

Fig. 3: Temporal trends in acoustic indices.

From: Bird population declines and species turnover are changing the acoustic properties of spring soundscapes

Fig. 3

Predicted annual variation in Acoustic Diversity Index, ADI (a, b), Acoustic Evenness Index, AEI (c, d), Bioacoustic Index, BI (e, f) and Acoustic Entropy, H (g, h) in North America (left column) between 1996 and 2017 and in Europe (right column) between 1998 and 2018. Blue (North America) and green (Europe) lines show the predicted trends from GLMMs (Table 3); shaded areas indicate 95% confidence intervals. Points show predicted annual values from GLMMs with the identical structure as those in Table 3 but with year fitted as a categorical rather than a continuous variable, vertical lines indicate the 95% confidence intervals. Annual values of each acoustic index were standardised at the site-level prior to analyses.

Back to article page