Repetitive calls of juvenile Richardson's ground squirrels (Spermophilus richardsonii) communicate response urgency

摘要: Richardson's ground squirrels, Spermophilus richardsonii, produce both repetitive and non-repetitive antipredator calls. While many hypotheses have been advanced to explain calls, the function of calling has received relatively little attention. We presented juvenile squirrels with a predator model at distances ranging from 1 8 m recorded subsequent calls on digital audiotape. The rate was inversely correlated distance between caller, explaining almost 24% variation in call rate. To determine whether recipients use that information, we manipulated intersyllable latency single exemplar form 3 test stimuli varying only Across 16 squirrel colonies which these were broadcast, proportion assuming highly vigilant, alert posture increased presented. Hence, appear communicate proximity presumably degree threat posed by potential predators. Resume : Les Spermophiles de Richardson, emettent des cris anti-predateurs repetitifs et non repetitifs. Alors que plusieurs ont ete avancees pour expliquer les repetitifs, le role peu etudie. Nous avons mis Richardson juveniles en presence d'un modele predateur, d e1a8m , enregistre qui suivi sur ruban audio. La frequence etait inversement proportionnelle la entre spermophile, expliquait 24 % va- riation cris. Pour determiner si auditeurs utilisent cette nous manipule temps latence syllabes seul cri repetitif obtenir experimentaux ne variant par Dans Richarson auxquelles donne entendre ces cris, spermophiles adopte une d'alerte sont restes tres vigilants augmente fonction du presente. jeunes semblent donc capables communiquer proximite probablement aussi gravite menace posent predateurs potentiels. (Traduit Redaction) 573