論文の公開元へTesting the roles of visual preference in the evolution of white dot plumage patterns in Estrildid finches (Family Estrildidae)
概要
Birds are characterised by conspicuous or cryptic plumage patterns, which are likely to
have evolved for intraspecific communications or as a result of predator-prey
interactions, respectively (Roulin 1999; Bortolotti et al. 2006; Gluckman 2014;
Marshall and Gluckman 2015; Soma and Garamszegi 2018). The signalling function of
patterns is often explained in light of honest indicator mechanisms, which propose that
vivid colours or distinct patterns are possessed by individuals with better conditions as
honest signals of an individual’s quality. Supporting this view, in zebra finches
Taeniopygia guttata, black and white stripes on the chest of the males represent early
nestling diets (Birkhead et al. 1999), and females prefer males with symmetric chest
stripes (Swaddle and Cuthill 1994). Similarly, in common waxbills Estrilda astrild, the
regularity of barred plumage reflects body condition, especially in adult males (Marques
et al. 2016).
What has remained a mystery until now is why a particular type of plumage
patterns (e.g., colour combinations or shape of the pattern motif, such as dots) evolved
in each species. In order to gain an evolutionary understanding of the plumage colour
patterns of different birds, it would be of help to investigate the role of foraging-related
sensory bias. Prey-like colour patterns are known to have evolved in fish (Rodd et al.
2002; Garcia and Ramirez 2005), which could be explained by deception mechanisms
that predict male signal traits exploit female sensory systems and females suffer costs,
and can also solely be attributed to shared visual mechanisms beneficial for the
detection of foods and the identification of conspecifics (sensory bias). ...
この論文で使われている画像
