The relative importance of local and global visual contrast in mate choice

被引:18
作者
Sibeaux, Adelaide [1 ]
Cole, Gemma L. [1 ]
Endler, John A. [1 ]
机构
[1] Deakin Univ, Ctr Integrat Ecol, Sch Life & Environm Sci, Waurn Ponds, Vic 3216, Australia
基金
澳大利亚研究理事会;
关键词
animal colour pattern; boundary strength analysis; colour patch adjacency; light environment; mate choice; overall pattern contrast; COLOR PATTERNS; SEXUAL SELECTION; POECILIA-RETICULATA; PLUMAGE COLORATION; EDGE-DETECTION; FEMALE CHOICE; GUPPY; EVOLUTION; VISION; PREFERENCE;
D O I
10.1016/j.anbehav.2019.06.020
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Colour signals are often made up of a number of colour patches. The position of these patches within a pattern has the potential to influence signal conspicuousness, especially if viewers attend to local rather than global aspects of the colour pattern. If local contrast is important, then signal efficacy should be highest when highly contrasting patches are adjacent; if local contrast is not important, contrasting colours can be anywhere in the pattern. We tested whether global or local colour patch contrast influenced the attractiveness of male guppies, Poecilia reticulata. We assessed contrast on both global and local scales using two methods. The first, overall pattern contrast, estimates the global pattern contrast without accounting for which colours are adjacent. The second, boundary strength analysis, accounts for local contrast by estimating the contrast intensity (Delta S) and contact lengths between adjacent patches. We tested behaviour under three different light environments: blue, broad spectrum (control) and red to modify visual contrast. The light environment had a significant effect on all measures of colour pattern contrast. The male overall pattern contrast measures did not affect female preferences under the three light environments. The coefficient of variation (CV) of chromatic Delta S was the only measure to show a significant effect on female preferences. Females favoured males that displayed high variation in local contrast (high CV of Delta S, independently of the light environment). Therefore, variation in local visual contrast appears to be more important than overall pattern contrast in guppies, regardless of the light environment. (C) 2019 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:143 / 159
页数:17
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