Frogs have rules: Selective attention algorithms regulate chorusing in Physalaemus Pustulosus (Leptodactylidae)

Citation
Md. Greenfield et As. Rand, Frogs have rules: Selective attention algorithms regulate chorusing in Physalaemus Pustulosus (Leptodactylidae), ETHOLOGY, 106(4), 2000, pp. 331-347
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ETHOLOGY
ISSN journal
0179-1613 → ACNP
Volume
106
Issue
4
Year of publication
2000
Pages
331 - 347
Database
ISI
SICI code
0179-1613(200004)106:4<331:FHRSAA>2.0.ZU;2-F
Abstract
In various acoustic insects and frogs, females preferentially orient toward s the leading of two or more males' advertisement signals that occur closel y in time. Such preferences in receivers have apparently selected for timin g mechanisms whereby male signallers actively refrain from calling immediat ely following the onset of a neighbour's call and thereby increase their pr oduction of leading calls. However, indiscriminate application of this inhi bitory mechanism to all neighbours might severely reduce a male's calling r ate, particularly in high density. Consequently, mechanisms of selective at tention to only a subset of signalling neighbours are expected. Female Tungara frogs (Physalaemus pustulosus) exhibit strong preferences fo r leading male calls, and males refrain from calling immediately following a neighbour. Four-loudspeaker playback experiments demonstrated that males do selectively apply this inhibitory mechanism to only a subset of close si gnalling neighbours. Selective attention is regulated by a combination of s liding threshold and fixed number rules: (i) Attend to the loudest (nearest ) conspecific neighbour and those additional ones whose calls are within 6- 8 dB of the loudest one; (ii) attend to only two neighbours in total when t he calls are weak or the second one is much farther than the first; (iii) a ttend to three neighbours when the calls are loud or all neighbours are app roximately equidistant. The means by which such plasticity may be achieved and its potential adaptiveness are discussed.