Individual variation in advertisement calls of territorial male green frogs, Rana clamitans: Implications for individual discrimination

Citation
Ma. Bee et al., Individual variation in advertisement calls of territorial male green frogs, Rana clamitans: Implications for individual discrimination, ETHOLOGY, 107(1), 2001, pp. 65-84
Citations number
59
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ETHOLOGY
ISSN journal
0179-1613 → ACNP
Volume
107
Issue
1
Year of publication
2001
Pages
65 - 84
Database
ISI
SICI code
0179-1613(200101)107:1<65:IVIACO>2.0.ZU;2-4
Abstract
Individuals of many territorial species discriminate between familiar terri torial neighbors and unfamiliar strangers based on individual differences i n acoustic signals. Many anuran amphibians are territorial and use primaril y acoustic communication during social interactions, but evidence for acous tically mediated individual discrimination is available only for one specie s. As a first step in research designed to investigate individual discrimin ation in a second species of territorial frog, we examined patterns of with in-male and among-male variability in 198 advertisement calls of 20 male gr een frogs, Rana clamitans. The aim was to determine which acoustic properti es could be used by males to recognize their territorial neighbors and to e stimate limits of reliability afforded by these properties for identifying different neighbors. All of the call properties that we examined exhibited significant inter-individual variation. Discriminant function analyses assi gned between 52% and 100% of calls to the correct individual, depending on sample size and the call properties included in the model. This suggests th at there is sufficient among-male variability to statistically identify ind ividuals by their advertisement calls. The call properties of fundamental f requency and dominant frequency contributed the most towards discrimination among individuals. Based on their natural history and behavior and the res ults reported here, we suggest that male green frogs likely discriminate be tween strangers and adjacently territorial neighbors based on individual va riation in advertisement calls.