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Ontogenetic changes in alarm-call production and usage in meerkats (Suricata suricatta): adaptations or constraints?


Hollén, L I; Clutton-Brock, T H; Manser, M B (2008). Ontogenetic changes in alarm-call production and usage in meerkats (Suricata suricatta): adaptations or constraints? Behavioral Ecology and Sociobiology, 62(5):821-829.

Abstract

In many species, individuals suffer major mortality in their first year because of predation. Behaviours that facilitate successful escape are therefore under strong selection, but anti-predator skills often emerge gradually during an individual’s early development. Using long-term data and acoustic recordings of alarm calls collected during natural predator encounters, we aimed to elucidate two largely unsolved issues in anti-predator ontogeny: (i) whether incorrect predator assignment is adaptively age-appropriate, given that vulnerability often change during development, or whether age-related differences reflect true mistakes made by immature individuals; and (ii) the extent to which the development of adult-like competence in alarm-call production and usage is simply a function of maturational processes or dependent upon experience. We found that young meerkats (Suricata suricatta) were less likely to give alarm calls than were adults, but alarmed more in response t
o non-threatening species compared to adults. However, stimuli that pose a greater threat to young than adults did not elicit more calling from young; this argues against age-related changes in vulnerability as the sole explanation for developmental changes in calling. Young in small groups, who were more likely to watch out for predators, alarmed more than less vigilant young in larger groups. Moreover, despite similarities in acoustic structure between alarm call types, calls appeared in the repertoire at different rates and those that were associated with frequently encountered predators were produced relatively early on. These results indicate that experience is a more plausible explanation for such developmental trajectories than is maturation.

In many species, individuals suffer major mortality in their first year because of predation. Behaviours that facilitate successful escape are therefore under strong selection, but anti-predator skills often emerge gradually during an individual’s early development. Using long-term data and acoustic recordings of alarm calls collected during natural predator encounters, we aimed to elucidate two largely unsolved issues in anti-predator ontogeny: (i) whether incorrect predator assignment is adaptively age-appropriate, given that vulnerability often change during development, or whether age-related differences reflect true mistakes made by immature individuals; and (ii) the extent to which the development of adult-like competence in alarm-call production and usage is simply a function of maturational processes or dependent upon experience. We found that young meerkats (Suricata suricatta) were less likely to give alarm calls than were adults, but alarmed more in response t
o non-threatening species compared to adults. However, stimuli that pose a greater threat to young than adults did not elicit more calling from young; this argues against age-related changes in vulnerability as the sole explanation for developmental changes in calling. Young in small groups, who were more likely to watch out for predators, alarmed more than less vigilant young in larger groups. Moreover, despite similarities in acoustic structure between alarm call types, calls appeared in the repertoire at different rates and those that were associated with frequently encountered predators were produced relatively early on. These results indicate that experience is a more plausible explanation for such developmental trajectories than is maturation.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:meerkats; alarm calls; development; experience; maturation; Suricata suricatta
Language:English
Date:March 2008
Deposited On:19 Aug 2008 09:48
Last Modified:05 Apr 2016 12:24
Publisher:Springer
ISSN:0340-5443
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:10.1007/s00265-007-0508-x
Permanent URL: http://doi.org/10.5167/uzh-2811

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