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Chromatic and achromatic differences of melanin-and carotenoid-based plumage coloration in five minivet species(Pericrocotus spp.)under conspecific and predator visual systems

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Avian Research 2023年第1期14卷 93-98页

作者： Yan Cai Xiangyang Chen Neng Wu Canchao Yang Ministry of Education Key Laboratory for Ecology of Tropical Islands College of Life SciencesHainan Normal UniversityHaikou571158China

Adaptive mate choice has been accepted as the leading theory to explain the colorful plumage of *** theory hypothesizes that conspicuous colors act as signals to advertise the qualities of the ***,a dilemma arises in that conspicuous colors may not only attract mates,but also alert ***"private channels of communication"hypothesis proposes that some intraspecific signals may not be visible to heterospecific animals because of different visual *** better understand the evolution of plumage colors and sexual selection in birds,here we studied the chromatic difference and achromatic differences of melanin-and carotenoid-based plumage coloration in five minivet species(Pericrocotus spp.)under conspecific and predator visual *** found that either the chromatic or achromatic difference among male or female minivets’plumage was consistently higher under conspecific vision than under predator vision for all five studied species of *** result indicated that individual differences in plumage colors of minivets were visible to the conspecific receivers and hidden from potential predators as a result of evolution under predation risk and conspecific ***,males were under a higher risk of predation because they were more conspicuous than females to the vision of a nocturnal predator.

关键词： Achromatic difference Adaptive mate choice Chromatic difference Omamental plumage visual modelling

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UV reflectance but no evidence for colour mimicry in a putative brood-deceptive orchid Corybas cheesemanii

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Current Zoology 2014年第1期60卷 104-113页

作者： M. M. KELLY A. C. GASKETT School of Biological Sciences The University of Auckland Private Bag 92019 Auckland 1142 New Zealand

Rewardless orchids attract pollinators by food, sexual, and brood-site mimicry, but other forms of sensory deception may also operate. Helmet orchids （Corybas, Nematoceras and related genera） are often assumed to be brood-site deceivers that mimic the colours and scents of mushrooms to fool female fungus gnats （Mycetophilidae） into attempting oviposition and polli- nating flowers. We sampled spectral reflectances and volatile odours of an endemic terrestrial New Zealand orchid Corybas cheesemanii, and co-occurring wild mushrooms. The orchid is scentless to humans and SPME GC-MS analyses did not detect any odours, but more sensitive methods may be required. The orchids reflected strongly across all visible wavelengths （300-700nm） with peaks in the UV （-320nm）, yellow-green （500-600 nm） and red regions （650-700 nm）, whereas mushrooms and surrounding leaf litter reflected predominantly red and no UV. Rather than mimicking mushrooms, these orchids may attract pollinators by exploiting insects＇ strong sensory bias for UV. modelling spectral reflectances into a categorical fly vision model and a generic tetrachromat vision model provided very different results, but neither suggest any mimicry of mushrooms. However, these models require further assessment and data on fly spectral sensitivity to red wavelengths is lacking - a problem given the predominance of red, fly-pollinated flowers worldwide

关键词： Diptera Colour space Fly pollination Orchidaceae Spectral reflectance visual modelling

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