Figure 2: Usage of D calls in a non-predatory context in Japanese great tits. | Nature Communications

Figure 2: Usage of D calls in a non-predatory context in Japanese great tits.

From: Experimental evidence for compositional syntax in bird calls

Figure 2

(a) Effect of the presence of a mate on the production of D calls (n=187 observations, n=40 individuals): tits produced D calls more often when they visited the nest alone than when they did following their mate (generalized linear mixed model: χ2=5.00, df=1, P=0.025), after controlling for the nonsignificant influence of sex of the callers (χ2=1.16, df=1, P=0.281). (b) Effect of D calls on the recruitment of their mate (n=136 observations, n=34 individuals): tits that produced D calls were more likely to subsequently attract their mates than tits that did not produce D calls (generalized linear mixed model: χ2=35.37, df=1, P<0.0001), even after controlling for a significant influence of the responding mate’s sex (males were more likely to approach D calls given by their partners than were females; χ2=9.32, df=1, P=0.002).

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