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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2014 Vol.33 No.5

Egg Reflectance Analysis of Several Alpine Meadow Nesting Passerines
Author of the article:SUN Jiachen1, 2, CHU Hui1, 2, LIU Lihua1, 2, ZHAO Liang1*
Author's Workplace:(1. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China)
Key Words:alpine meadow; passerines; egg color; egg reflectance; thermoregulation; nest type; nest predation
Abstract:To explore the potential relevance between egg coloration and incubation temperature in breeding seasons of Passeriformes, from 2010 to 2013, eggs of 9 species of Passeriformes were collected from alpine meadow and the egg reflectance were measured, respectively. The spectral range were 400~750 nm (visible light) and 750~1050 nm (near infrared spectrum). The mean egg reflectance in the two spectral range were 0.066 and 0.123, and the NIR reflectance was significantly different from the visible light reflectance, indicated that the heat control mechanism of eggshell was favored by passerines nesting in alpine meadow. Significant difference was also found in egg reflectance in the NIR range of different nest types, but not in the visible light range, suggesting different nest environments affected incubation temperature differently. Results also indicated no significant difference in egg color among 8 species except black redstart (Phoenicurus ochruros), suggesting predation pressure drive selection of crypsis eggshell coloration; but from the perspective of thermoregulation, there was significant difference in the NIR reflectance, which explained the breeding ecology in the alpine meadow favored plain but thermoregulatable eggshell instead of conspicuous ones.
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