Contextual variation in chimpanzee pant hoots and its implications for referential communication

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The alarm-calling system of adult male putty-nosed monkeys, Cercopithecus nictitans martini (2006, background): “We consider the transition from long pyows to progressively shorter pyows to be the result of increased calling effort during the production of long and uninterrupted call series (Notman & Rendall 2005).”
Production of food-associated calls in wild male chimpanzees is dependent on the composition of the audience (2010, unknown): “This is in contrast to the high-amplitude pant hoot calls that males often produce when finding food (Notman and Rendall 2005), which appears to function in announcing food to distant individuals in other parties.”
Production and perception of situationally variable alarm calls in wild tufted capuchin monkeys (Cebus apella nigritus) (2010, background): “…of context specificity in alarm call production (Digweed et al. 2005; Fichtel et al. 2005; Clarke et al. 2006; see also Crockford and Boesch 2003; Notman and Rendall 2005), but the evidence of stimulus independent responses in these cases is limited because playback experiments were not…”
Vocal, gestural and locomotor responses of wild chimpanzees to familiar and unfamiliar intruders: A playback study (2009, unknown): “These calls are mainly produced by adult males, usually in the vicinity of others (Crockford & Boesch 2003; Notman & Rendall 2005).”