Seasonal changes in Hermit Thrush (Catharus guttatus) song syntax  

作　　者：Sean P.Roach Luke C.McLean Jeff W.MacLeod Leslie S.Phillmore 

机构地区：[1]Psychology Department,University of New Brunswick Saint John,100 Tucker Park Road,Saint John,NB,Canada [2]Department of Psychology and Neuroscience,Dalhousie University,1355 Oxford St,Halifax,NS,B3H 4J1,Canada

出　　处：《Avian Research》2024年第2期172-179,共8页鸟类学研究（英文版）

基　　金：partly funded by an NSERC Discovery Grant received by LS Phillmore;a UNB University Research Fund grant received by SP Roach

摘　　要：In many songbird species,birdsong features phonological syntax,meaning that the units within their vocal se-quences are ordered in a non-random way that adheres to a rule.While such syntactical patterns have been richly described in many species,comparatively little is known about how those patterns contribute to song achieving its important functions.For each of song’s main functions,territorial defense and mate attraction,evidence of a role for syntax is limited.One species for which syntax has been thoroughly described is the Hermit Thrush(Catharus guttatus),which presents song types from their repertoires in a semi-predictable order and,in doing so,rapidly cycle up and down the frequency spectrum.The objective of the present study was to explore the importance of song syntax in the Hermit Thrush through a within-subject examination of how measures of syntax,such as the predictability of song type order within song sequences,shift over the breeding season.We hypothesized that,if such syntactical characteristics are important to breeding behaviour,they would be most prominent at the start of the breeding season when activity associated with territory establishment and mate attraction is most intense.Analysis revealed that,as predicted,the rigidness of song type ordering within se-quences was highest at the start of the season and declined thereafter.That song type sequences were most predictable at the vitally important early part of the breeding season fit our hypothesis that this aspect of song syntax is important to song’s functions related to territory establishment and/or mate attraction.Future work will clarify whether that role relates to one of song’s two main functions or serves song transmission in some broader way.

关 键 词：BIRDSONG Hermit Thrush Seasonal change STEREOTYPY SYNTAX 

分 类 号：Q958[生物学—动物学]