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  • 1
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    Illusions promote mating success in great bowerbirds (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-01-24
    Description: Sexual selection studies normally compare signal strengths, but signal components and sensory processing may interact to create misleading or attention-capturing illusions. Visual illusions can be produced by altering object and scene geometry in ways that trick the viewer when seen from a particular direction. Male great bowerbirds actively maintain size-distance gradients of objects on their bower courts that create forced-perspective illusions for females viewing their displays from within the bower avenue. We show a significant relationship between mating success and the female's view of the gradient; this view explains substantially more variance in mating success than the strength of the gradients. Illusions may be widespread in other animals because males of most species display to females with characteristic orientation and distance, providing excellent conditions for illusions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kelley, Laura A -- Endler, John A -- New York, N.Y. -- Science. 2012 Jan 20;335(6066):335-8. doi: 10.1126/science.1212443.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Integrative Ecology, School of Life & Environmental Sciences, Deakin University, Geelong, VIC 3216, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22267812" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Attention ; Female ; Male ; *Mating Preference, Animal ; *Optical Illusions ; Passeriformes/*physiology ; Reproduction ; *Sexual Behavior, Animal ; Size Perception ; Space Perception
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Extreme reversed sexual dichromatism in a bird without sex role reversal (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-07-26
    Description: Brilliant plumage is typical of male birds, reflecting differential enhancement of male traits when females are the limiting sex. Brighter females are thought to evolve exclusively in response to sex role reversal. The striking reversed plumage dichromatism of Eclectus roratus parrots does not fit this pattern. We quantify plumage color in this species and show that very different selection pressures are acting on males and females. Male plumage reflects a compromise between the conflicting requirements for camouflage from predators while foraging and conspicuousness during display. Females are liberated from the need for camouflage but compete for rare nest hollows.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heinsohn, Robert -- Legge, Sarah -- Endler, John A -- New York, N.Y. -- Science. 2005 Jul 22;309(5734):617-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Resource and Environmental Studies, Australian National University, Canberra, ACT 0200 Australia. Robert.Heinsohn@anu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16040708" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; Animals ; *Behavior, Animal ; Color ; Competitive Behavior ; *Feathers ; Feeding Behavior ; Female ; Male ; Nesting Behavior ; Parrots/genetics/*physiology ; *Pigmentation ; Predatory Behavior ; *Selection, Genetic ; *Sex Characteristics ; Sex Ratio ; Sexual Behavior, Animal
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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