Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants?
High latitude and altitude floras are characterized by low-statured, small, wind-pollinated plants, which mainly reproduce by self-pollination or asexual reproduction. However, at odds with this are some sub-Antarctic islands that have plant species with giant growth forms and large, brightly colour...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/3261 2024-06-23T07:47:19+00:00 Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants? Little, Lorna Eidesen, Pernille Bronken Müller, Eike Dickinson, Katharine J.M. Lord, Janice M. 2016-08-29 application/pdf text/html application/epub+zip application/xml https://polarresearch.net/index.php/polar/article/view/3261 https://doi.org/10.3402/polar.v35.26030 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/3261/8640 https://polarresearch.net/index.php/polar/article/view/3261/8641 https://polarresearch.net/index.php/polar/article/view/3261/8642 https://polarresearch.net/index.php/polar/article/view/3261/8643 https://polarresearch.net/index.php/polar/article/view/3261/8649 https://polarresearch.net/index.php/polar/article/view/3261 doi:10.3402/polar.v35.26030 Polar Research; Vol 35 (2016) 1751-8369 Campbell Island flower colour thermal imaging Pleurophyllum speciosum info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftjpolarres https://doi.org/10.3402/polar.v35.26030 2024-06-13T23:33:00Z High latitude and altitude floras are characterized by low-statured, small, wind-pollinated plants, which mainly reproduce by self-pollination or asexual reproduction. However, at odds with this are some sub-Antarctic islands that have plant species with giant growth forms and large, brightly coloured flowers which require insect visitation for pollination. The size, colour and shape of the inflorescences and leaves of these megaherbs suggest thermal benefits similar to giant tropical alpine plants of equatorial Africa, South America and Hawaii. We evaluated whether heating occurs in sub-Antarctic megaherbs, and to what extent it is related to environmental variables. We measured leaf and inflorescence temperature in six sub-Antarctic megaherb species on Campbell Island, latitude 52.3°S, New Zealand Biological Region. Using thermal imaging techniques, in combination with measurement of solar radiation, ambient air temperature, wind speed, wind chill and humidity, we assessed environmental influences on leaf and floral heating. We found that leaf and inflorescence temperatures of all megaherbs were higher than simultaneously measured ambient temperatures. Greatest heating was seen in Pleurophyllum speciosum, with observed leaves 9°C higher, and inflorescences nearly 11°C higher, than ambient temperature. Heating was highly correlated with brief, unpredictable periods of solar radiation, and occurred most rapidly in species with hairy, corrugated leaves and darkly pigmented, densely packed inflorescences. This is the first evidence that floral and leaf heating occurs in sub-Antarctic megaherbs, and suggests that leaf hairiness, flower colour and shape could provide thermal benefits like those seen in tropical alpine megaherbs.Keywords: Campbell Island; flower colour; thermal imaging; Pleurophyllum speciosum.(Published: 29 August 2016)To access the supplementary material for this article, please see the supplementary files in the column to the right (under Article Tools).Citation: Polar Research 2016, 35, 26030, ... Article in Journal/Newspaper Antarc* Antarctic Polar Research Polar Research Antarctic Campbell Island ENVELOPE(169.500,169.500,-52.500,-52.500) New Zealand Polar Research 35 1 26030 |
institution |
Open Polar |
collection |
Polar Research |
op_collection_id |
ftjpolarres |
language |
English |
topic |
Campbell Island flower colour thermal imaging Pleurophyllum speciosum |
spellingShingle |
Campbell Island flower colour thermal imaging Pleurophyllum speciosum Little, Lorna Eidesen, Pernille Bronken Müller, Eike Dickinson, Katharine J.M. Lord, Janice M. Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants? |
topic_facet |
Campbell Island flower colour thermal imaging Pleurophyllum speciosum |
description |
High latitude and altitude floras are characterized by low-statured, small, wind-pollinated plants, which mainly reproduce by self-pollination or asexual reproduction. However, at odds with this are some sub-Antarctic islands that have plant species with giant growth forms and large, brightly coloured flowers which require insect visitation for pollination. The size, colour and shape of the inflorescences and leaves of these megaherbs suggest thermal benefits similar to giant tropical alpine plants of equatorial Africa, South America and Hawaii. We evaluated whether heating occurs in sub-Antarctic megaherbs, and to what extent it is related to environmental variables. We measured leaf and inflorescence temperature in six sub-Antarctic megaherb species on Campbell Island, latitude 52.3°S, New Zealand Biological Region. Using thermal imaging techniques, in combination with measurement of solar radiation, ambient air temperature, wind speed, wind chill and humidity, we assessed environmental influences on leaf and floral heating. We found that leaf and inflorescence temperatures of all megaherbs were higher than simultaneously measured ambient temperatures. Greatest heating was seen in Pleurophyllum speciosum, with observed leaves 9°C higher, and inflorescences nearly 11°C higher, than ambient temperature. Heating was highly correlated with brief, unpredictable periods of solar radiation, and occurred most rapidly in species with hairy, corrugated leaves and darkly pigmented, densely packed inflorescences. This is the first evidence that floral and leaf heating occurs in sub-Antarctic megaherbs, and suggests that leaf hairiness, flower colour and shape could provide thermal benefits like those seen in tropical alpine megaherbs.Keywords: Campbell Island; flower colour; thermal imaging; Pleurophyllum speciosum.(Published: 29 August 2016)To access the supplementary material for this article, please see the supplementary files in the column to the right (under Article Tools).Citation: Polar Research 2016, 35, 26030, ... |
format |
Article in Journal/Newspaper |
author |
Little, Lorna Eidesen, Pernille Bronken Müller, Eike Dickinson, Katharine J.M. Lord, Janice M. |
author_facet |
Little, Lorna Eidesen, Pernille Bronken Müller, Eike Dickinson, Katharine J.M. Lord, Janice M. |
author_sort |
Little, Lorna |
title |
Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants? |
title_short |
Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants? |
title_full |
Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants? |
title_fullStr |
Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants? |
title_full_unstemmed |
Leaf and floral heating in cold climates: do sub-Antarctic megaherbs resemble tropical alpine giants? |
title_sort |
leaf and floral heating in cold climates: do sub-antarctic megaherbs resemble tropical alpine giants? |
publisher |
Norwegian Polar Institute |
publishDate |
2016 |
url |
https://polarresearch.net/index.php/polar/article/view/3261 https://doi.org/10.3402/polar.v35.26030 |
long_lat |
ENVELOPE(169.500,169.500,-52.500,-52.500) |
geographic |
Antarctic Campbell Island New Zealand |
geographic_facet |
Antarctic Campbell Island New Zealand |
genre |
Antarc* Antarctic Polar Research |
genre_facet |
Antarc* Antarctic Polar Research |
op_source |
Polar Research; Vol 35 (2016) 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/3261/8640 https://polarresearch.net/index.php/polar/article/view/3261/8641 https://polarresearch.net/index.php/polar/article/view/3261/8642 https://polarresearch.net/index.php/polar/article/view/3261/8643 https://polarresearch.net/index.php/polar/article/view/3261/8649 https://polarresearch.net/index.php/polar/article/view/3261 doi:10.3402/polar.v35.26030 |
op_doi |
https://doi.org/10.3402/polar.v35.26030 |
container_title |
Polar Research |
container_volume |
35 |
container_issue |
1 |
container_start_page |
26030 |
_version_ |
1802651412049428480 |