Table 1 Overview of the predictions: the table provides a short description of the three call types and how important transmitting identity (ID) is for each of them, and the predictions with regard to the patterns and consequences of accommodation.
Phee calls | Trill calls | Food calls | |
|---|---|---|---|
Call description | Long distance contact calls, produced when separated, out of sight | Close distance contact calls, usually produced within sight of others | Communicates detection and intent to share food; with or without close contact |
Importance of ID | Crucial, as animals have to convey their ID | Less important; redundant as ID is directly visible | Important for receiver to know which individual is willing to share food |
Predictions: patterns of accommodation | |||
Extent of accommodation | Little accommodation expected | Highest amount of accommodation expected | Little accommodation expected |
Accommodation correlates with initial vocal distance | Expected | Expected | Expected |
Predictions: consequences of accommodation | |||
Reduction in statistical individual distinctiveness | Not expected | Possible | Not expected |
