Headbob display analysis of the Grand Cayman anole, Anolis conspersus

Citation
Jm. Macedonia et Dl. Clark, Headbob display analysis of the Grand Cayman anole, Anolis conspersus, J HERPETOL, 35(2), 2001, pp. 300-310
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
JOURNAL OF HERPETOLOGY
ISSN journal
0022-1511 → ACNP
Volume
35
Issue
2
Year of publication
2001
Pages
300 - 310
Database
ISI
SICI code
0022-1511(200106)35:2<300:HDAOTG>2.0.ZU;2-A
Abstract
Headbob displays from 22 adult male Anolis conspersus of three "color morph s" (green, brown, and blue) were videotaped in the laboratory. Frame-by-fra me coordinates of the vertical head motions were used to generate display-a ction-pattern (DAP) graphs. Field observations had revealed that only one t ype of headbob display ("Type A") was performed when males displayed to non specific audiences while moving around their territories ("male-alone conte xt"). During staged male encounters in the lab ("male-male context"), Type A displays and a second type of display ("Type B") were produced. The two t ypes of displays were partitioned into units that were compared among the c olor morphs. We then transformed the display units with principle component s analysis and used one-way ANOVAs to test statistically for differences am ong the color morphs at the "unit" level. Finally, we used discriminant fun ction analysis to test for color morph differences at the "display" level. Graphical visualization and statistical analyses showed that, like body col oration, the green and the brown morph are more distinctive from each other than either is from the blue morph, although the differences in display un its among the color forms am subtle. Given that A. conspersus is a member o f the seven-species Anolis radiation on Jamaica, we compare the structure o f one of its displays (Type A) with that of its closest relative, Anolis gr ahami. Last, we speculate on the possible origin of the unusual display str ucture observed in the A. conspersus Type B display.