Sökning: onr:"swepub:oai:lup.lub.lu.se:083e61ca-ed04-48b1-8046-b8aa9f5e5f1c" >
Thermal emissivity ...
Thermal emissivity of avian eggshells
-
- Björn, Lars Olof (författare)
- Lund University,Lunds universitet,Molekylär cellbiologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Molecular Cell Biology,Department of Biology,Faculty of Science
-
- Bengtson, Sven-Axel (författare)
- Lund University,Lunds universitet,Zoologiska samlingarna,Biologiska museet,Biologiska institutionen,Naturvetenskapliga fakulteten,Evolutionär ekologi,Zoological collections,Biological Museum,Department of Biology,Faculty of Science,Evolutionary ecology
-
- Li, Shaoshan (författare)
- South China Normal University
-
visa fler...
-
- Hecker, Christoph (författare)
- University of Twente
-
- Saleem, Ullah (författare)
- Institute of Space Technology, Islamabad
-
- Roos, Arne (författare)
- Uppsala universitet,Uppsala University,Fasta tillståndets fysik
-
- Nilsson, Annica M. (författare)
- Uppsala universitet,Uppsala University,Fasta tillståndets fysik
-
visa färre...
-
(creator_code:org_t)
- Elsevier BV, 2016
- 2016
- Engelska 6 s.
-
Ingår i: Journal of Thermal Biology. - : Elsevier BV. - 0306-4565 .- 1879-0992. ; 57, s. 1-5
- Relaterad länk:
-
http://dx.doi.org/10...
-
visa fler...
-
https://lup.lub.lu.s...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
visa färre...
Abstract
Ämnesord
Stäng
- The hypothesis has been tested that evolution has resulted in lower thermal emissivity of eggs of birds breeding openly in cold climates than of eggs of birds that nest under protective covering or in warmer climates. Directional thermal emissivity has been estimated from directional–hemispherical reflectance spectra. Due to several methodological difficulties the absolute emissivity is not accurately determined, but differences between species are obvious. Mostnotably, small waders of the genus Calidris, breeding in cold climates on the tundra, and in most cases with uniparental nest attendance, have low directional emissivity of their eggshells, about 0.92 when integration is carried out for wavelengths up to 16 μm. Species belonging to Galloanserinae have the highest directional emissivity, about 0.96, of their eggs. No differences due to climate or breeding conditions were found within this group. Eggs of most other birds tested possess intermediate emissivity, but the values for Pica pica and Corvus corone cornix are as low as for Calidris. Large species-dependent differences in spectral reflectance were found at specific wavelengths. For instance, at 4.259 μm the directional–hemispherical reflectance for galliforms range from 0.05 to 0.09, while for Fratercula arctica and Fulmarus glacialis it is about 0.3.The reflection peaks at 6.5 and 11.3 μm due to calcite are differentially attenuated in differents pecies. In conclusion, the hypothesis that evolution has resulted in lower thermal emissivity of bird-eggs being exposed in cold climates is not supported by our results.The emissivity is not clearly related to nesting habits or climate, and it is unlikely that the small differences observed are ecologically important. The spectral differences between eggs that nevertheless exist should be taken into account when using infrared thermometers for estimating the surface temperature of avian eggs.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Zoologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Zoology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Annan biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Other Biological Topics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Industriell bioteknik -- Biomaterial (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Industrial Biotechnology -- Bio Materials (hsv//eng)
Nyckelord
- Avian eggs
- Birds
- Heat dissipation
- Egg cooling
- Incubation
- Seabirds
- Thermal radiation
- Waders
- Avian eggs; Birds; Heat dissipation; Egg cooling; Thermal emissivity; Incubation; Seabirds; Thermal radiation; Waders
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas