Thermal emissivity of avian eggshells
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 r...
Published in: | Journal of Thermal Biology |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2016
|
Subjects: | |
Online Access: | https://lup.lub.lu.se/record/083e61ca-ed04-48b1-8046-b8aa9f5e5f1c https://doi.org/10.1016/j.jtherbio.2015.11.008 |
id |
ftulundlup:oai:lup.lub.lu.se:083e61ca-ed04-48b1-8046-b8aa9f5e5f1c |
---|---|
record_format |
openpolar |
spelling |
ftulundlup:oai:lup.lub.lu.se:083e61ca-ed04-48b1-8046-b8aa9f5e5f1c 2023-09-05T13:19:32+02:00 Thermal emissivity of avian eggshells Björn, Lars Olof Bengtson, Sven-Axel Li, Shaoshan Hecker, Christoph Saleem, Ullah Roos, Arne Nilsson, Annica 2016-03 https://lup.lub.lu.se/record/083e61ca-ed04-48b1-8046-b8aa9f5e5f1c https://doi.org/10.1016/j.jtherbio.2015.11.008 eng eng Elsevier https://lup.lub.lu.se/record/083e61ca-ed04-48b1-8046-b8aa9f5e5f1c http://dx.doi.org/10.1016/j.jtherbio.2015.11.008 scopus:84957957246 Journal of Thermal Biology; 57, pp 1-5 (2016) ISSN: 0306-4565 Ecology Zoology Avian eggs Birds Heat dissipation Egg cooling Incubation Seabirds Thermal radiation Waders contributiontojournal/article info:eu-repo/semantics/article text 2016 ftulundlup https://doi.org/10.1016/j.jtherbio.2015.11.008 2023-08-23T22:28:38Z 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. Article in Journal/Newspaper fratercula Fratercula arctica Fulmarus glacialis Tundra Lund University Publications (LUP) Journal of Thermal Biology 57 1 5 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology Zoology Avian eggs Birds Heat dissipation Egg cooling Incubation Seabirds Thermal radiation Waders |
spellingShingle |
Ecology Zoology Avian eggs Birds Heat dissipation Egg cooling Incubation Seabirds Thermal radiation Waders Björn, Lars Olof Bengtson, Sven-Axel Li, Shaoshan Hecker, Christoph Saleem, Ullah Roos, Arne Nilsson, Annica Thermal emissivity of avian eggshells |
topic_facet |
Ecology Zoology Avian eggs Birds Heat dissipation Egg cooling Incubation Seabirds Thermal radiation Waders |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Björn, Lars Olof Bengtson, Sven-Axel Li, Shaoshan Hecker, Christoph Saleem, Ullah Roos, Arne Nilsson, Annica |
author_facet |
Björn, Lars Olof Bengtson, Sven-Axel Li, Shaoshan Hecker, Christoph Saleem, Ullah Roos, Arne Nilsson, Annica |
author_sort |
Björn, Lars Olof |
title |
Thermal emissivity of avian eggshells |
title_short |
Thermal emissivity of avian eggshells |
title_full |
Thermal emissivity of avian eggshells |
title_fullStr |
Thermal emissivity of avian eggshells |
title_full_unstemmed |
Thermal emissivity of avian eggshells |
title_sort |
thermal emissivity of avian eggshells |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://lup.lub.lu.se/record/083e61ca-ed04-48b1-8046-b8aa9f5e5f1c https://doi.org/10.1016/j.jtherbio.2015.11.008 |
genre |
fratercula Fratercula arctica Fulmarus glacialis Tundra |
genre_facet |
fratercula Fratercula arctica Fulmarus glacialis Tundra |
op_source |
Journal of Thermal Biology; 57, pp 1-5 (2016) ISSN: 0306-4565 |
op_relation |
https://lup.lub.lu.se/record/083e61ca-ed04-48b1-8046-b8aa9f5e5f1c http://dx.doi.org/10.1016/j.jtherbio.2015.11.008 scopus:84957957246 |
op_doi |
https://doi.org/10.1016/j.jtherbio.2015.11.008 |
container_title |
Journal of Thermal Biology |
container_volume |
57 |
container_start_page |
1 |
op_container_end_page |
5 |
_version_ |
1776200326581321728 |