Licht-im-Terrarium: Literaturdatenbank
Licht-im-Terrarium: Literaturdatenbank |
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Veilleux, C. C., & Cummings, M. E. (2012). Nocturnal light environments and species ecology: Implications for nocturnal color vision in forests. Journal of Experimental Biology, 215(23), 4085–4096. Added by: Sarina (2016-01-31 18:25:22) |
| Resource type: Journal Article DOI: 10.1242/jeb.071415 ID no. (ISBN etc.): 0022-0949 BibTeX citation key: Veilleux2012 View all bibliographic details  |
Categories: Englisch = English Keywords: Chronobiologie = Chronobiology, Farbsehen = Color Vision, Mond = Moon Creators: Cummings, Veilleux Collection: Journal of Experimental Biology |
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| Abstract |
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Although variation in the color of light in terrestrial diurnal and twilight environments has been well documented, relatively little work has examined the color of light in nocturnal habitats. Understanding the range and sources of variation in nocturnal light environments has important implications for nocturnal vision, particularly following recent discoveries of nocturnal color vision. In this study, we measured nocturnal irradiance in a dry forest/woodland and a rainforest in Madagascar over 34 nights. We found that a simple linear model including the additive effects of lunar altitude, lunar phase and canopy openness successfully predicted total irradiance flux measurements across 242 clear sky measurements (r=0.85, P<0.0001). However, the relationship between these variables and spectral irradiance was more complex, as interactions between lunar altitude, lunar phase and canopy openness were also important predictors of spectral variation. Further, in contrast to diurnal conditions, nocturnal forests and woodlands share a yellow-green-dominant light environment with peak flux at 560 nm. To explore how nocturnal light environments influence nocturnal vision, we compared photoreceptor spectral tuning, habitat preference and diet in 32 nocturnal mammals. In many species, long-wavelength-sensitive cone spectral sensitivity matched the peak flux present in nocturnal forests and woodlands, suggesting a possible adaptation to maximize photon absorption at night. Further, controlling for phylogeny, we found that fruit/flower consumption significantly predicted short-wavelength-sensitive cone spectral tuning in nocturnal mammals (P=0.002). These results suggest that variation in nocturnal light environments and species ecology together influence cone spectral tuning and color vision in nocturnal mammals. AICAkaike{textquoteright}s information criterionAnkoAnkoasifaka Research Station, Kirindy Mitea National Park, Madagascar%LWpercent long wavelength irradiance measured with filters (560{textendash}650/680 nm)LWSlong-wavelength-sensitive%MWpercent middle wavelength irradiance measured with filters (490{textendash}540 nm)PGLSphylogenetic generalized least squares%SWpercent short wavelength irradiance measured with filters (400{textendash}460 nm)SWSshort-wavelength-sensitiveTalaTalatakely, Ranomafana National Park, MadagascarValoValohoaka, Ranomafana National Park, Madagascarλmaxpeak spectral sensitivity of visual pigment
Added by: Sarina |