Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island
Understanding the mechanisms by which aphids survive low temperature is fundamental in forecasting the risk of pest outbreaks. Aphids are chill susceptible and die at a temperature close to that at which a small exothermal event is produced. This event, which can be identified using differential sca...
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Elsevier
2010
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Online Access: | http://nora.nerc.ac.uk/id/eprint/10833/ http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6T94-506RN6C-2-N&_cdi=5104&_user=1773399&_pii=S0306456510000458&_orig=browse&_coverDate=08%2F31%2F2010&_sk=999649993&view=c&wchp=dGLbVtz-zSkzk&md5=7393c61be0c869ce8be975d8397964ac&ie=/sdarticle.pdf |
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ftnerc:oai:nora.nerc.ac.uk:10833 2023-05-15T13:45:10+02:00 Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island Worland, M. Roger Janion, Charlene Treasure, Anne M. Chown, Steven L. 2010 http://nora.nerc.ac.uk/id/eprint/10833/ http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6T94-506RN6C-2-N&_cdi=5104&_user=1773399&_pii=S0306456510000458&_orig=browse&_coverDate=08%2F31%2F2010&_sk=999649993&view=c&wchp=dGLbVtz-zSkzk&md5=7393c61be0c869ce8be975d8397964ac&ie=/sdarticle.pdf unknown Elsevier Worland, M. Roger; Janion, Charlene; Treasure, Anne M.; Chown, Steven L. 2010 Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island. Journal of Thermal Biology, 35 (6). 255-262. https://doi.org/10.1016/j.jtherbio.2010.05.008 <https://doi.org/10.1016/j.jtherbio.2010.05.008> Biology and Microbiology Zoology Ecology and Environment Publication - Article PeerReviewed 2010 ftnerc https://doi.org/10.1016/j.jtherbio.2010.05.008 2023-02-04T19:26:58Z Understanding the mechanisms by which aphids survive low temperature is fundamental in forecasting the risk of pest outbreaks. Aphids are chill susceptible and die at a temperature close to that at which a small exothermal event is produced. This event, which can be identified using differential scanning calorimetry (DSC), normally occurs at a higher temperature than the supercooling point (SCP) and has been termed a pre-freeze event (PFE). However, it is not known what causes the PFE or whether it signifies the death of the aphid. These questions are addressed here by using a sensitive DSC to quantify the PFE and SCP and to relate these thermal events to the lower lethal temperature (LT50) of sub-Antarctic aphids acclimated to low temperatures. PFEs were observed in each of the 3 species of aphids examined. They occurred over a narrower temperature range and at a higher temperature range than the SCP (−8.2 to −13.8 and −5.6 to −29.8 °C, respectively). Increased acclimation temperature resulted in increased SCPs in Myzus ascalonicus but not in Rhopalosiphum padi. The LT50 reduced by approximately 1 °C from −9.3 to −10.5 °C with reduced acclimation temperature (10–0 °C). The LT50 was close to the temperature at which the PFE occurred but statistically significantly higher than either the PFE or the SCP. In the majority of cases the PFE exotherm occurred well before the main exotherm produced by the bulk of the insect’s body water freezing (SCP). However, in a few cases it occurred at the same temperature or before the super-cooling point making the term, pre-freeze event (PFE), rather misleading. The possible origins of the PFE are discussed. Article in Journal/Newspaper Antarc* Antarctic Marion Island Natural Environment Research Council: NERC Open Research Archive Antarctic Journal of Thermal Biology 35 6 255 262 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Biology and Microbiology Zoology Ecology and Environment |
spellingShingle |
Biology and Microbiology Zoology Ecology and Environment Worland, M. Roger Janion, Charlene Treasure, Anne M. Chown, Steven L. Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island |
topic_facet |
Biology and Microbiology Zoology Ecology and Environment |
description |
Understanding the mechanisms by which aphids survive low temperature is fundamental in forecasting the risk of pest outbreaks. Aphids are chill susceptible and die at a temperature close to that at which a small exothermal event is produced. This event, which can be identified using differential scanning calorimetry (DSC), normally occurs at a higher temperature than the supercooling point (SCP) and has been termed a pre-freeze event (PFE). However, it is not known what causes the PFE or whether it signifies the death of the aphid. These questions are addressed here by using a sensitive DSC to quantify the PFE and SCP and to relate these thermal events to the lower lethal temperature (LT50) of sub-Antarctic aphids acclimated to low temperatures. PFEs were observed in each of the 3 species of aphids examined. They occurred over a narrower temperature range and at a higher temperature range than the SCP (−8.2 to −13.8 and −5.6 to −29.8 °C, respectively). Increased acclimation temperature resulted in increased SCPs in Myzus ascalonicus but not in Rhopalosiphum padi. The LT50 reduced by approximately 1 °C from −9.3 to −10.5 °C with reduced acclimation temperature (10–0 °C). The LT50 was close to the temperature at which the PFE occurred but statistically significantly higher than either the PFE or the SCP. In the majority of cases the PFE exotherm occurred well before the main exotherm produced by the bulk of the insect’s body water freezing (SCP). However, in a few cases it occurred at the same temperature or before the super-cooling point making the term, pre-freeze event (PFE), rather misleading. The possible origins of the PFE are discussed. |
format |
Article in Journal/Newspaper |
author |
Worland, M. Roger Janion, Charlene Treasure, Anne M. Chown, Steven L. |
author_facet |
Worland, M. Roger Janion, Charlene Treasure, Anne M. Chown, Steven L. |
author_sort |
Worland, M. Roger |
title |
Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island |
title_short |
Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island |
title_full |
Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island |
title_fullStr |
Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island |
title_full_unstemmed |
Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island |
title_sort |
pre-freeze mortality in three species of aphids from sub-antarctic marion island |
publisher |
Elsevier |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/10833/ http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6T94-506RN6C-2-N&_cdi=5104&_user=1773399&_pii=S0306456510000458&_orig=browse&_coverDate=08%2F31%2F2010&_sk=999649993&view=c&wchp=dGLbVtz-zSkzk&md5=7393c61be0c869ce8be975d8397964ac&ie=/sdarticle.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Marion Island |
genre_facet |
Antarc* Antarctic Marion Island |
op_relation |
Worland, M. Roger; Janion, Charlene; Treasure, Anne M.; Chown, Steven L. 2010 Pre-freeze mortality in three species of aphids from sub-Antarctic Marion Island. Journal of Thermal Biology, 35 (6). 255-262. https://doi.org/10.1016/j.jtherbio.2010.05.008 <https://doi.org/10.1016/j.jtherbio.2010.05.008> |
op_doi |
https://doi.org/10.1016/j.jtherbio.2010.05.008 |
container_title |
Journal of Thermal Biology |
container_volume |
35 |
container_issue |
6 |
container_start_page |
255 |
op_container_end_page |
262 |
_version_ |
1766214321216421888 |