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Assortative Pairings in D iamond F iretails ( S tagonopleura guttata ) are not the Result of Mutual Mate Choice for an Ornament
Author(s) -
Zanollo Valeria,
Griggio Matteo,
Robertson Jeremy,
Kleindorfer Sonia
Publication year - 2014
Publication title -
ethology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.739
H-Index - 74
eISSN - 1439-0310
pISSN - 0179-1613
DOI - 10.1111/eth.12268
Subject(s) - assortative mating , mate choice , sexual selection , flank , biology , spots , preference , pairing , white (mutation) , trait , mating , zoology , genetics , statistics , mathematics , anatomy , botany , gene , computer science , programming language , superconductivity , physics , quantum mechanics
Positive assortative mating occurs when individuals with similar phenotypes mate more frequently with each other than is expected by chance. In species in which both the males and females are ornamented, assortative pairings could arise from mutual mate choice on the same trait. We test this mechanism of mate choice and assortative pairing in the D iamond F iretail ( S tagonopleura guttata ), an A ustralian estrildid finch in which both sexes are ornamented with red bills, red rumps and white flank spots. We have previously shown sex differences in the degree of ornamentation as females have more flank spots than males. These white flank spots are used during sexual display, being fully displayed by courting males and by females when approaching a displaying male. Here, we experimentally test whether mutual mate preference is based on the number of flank spots. There was no evidence for a direct mutual preference for spot number. Given a choice of potential mates with a natural or experimentally manipulated number of flank spots, males preferred females with more spots, while female preference was not solely based on flank spots. Intriguingly, in both wild and captive Diamond Firetails, we found the number of flank spots in pairs was correlated suggesting a basis for positive assortative pairing. Nevertheless, we conclude that assortative pairing in Diamond Firetails is not due to mutual choice of mates based on the number of flank spots. We discuss different selection pathways for this trait in each sex.