Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle
The sub-AntarcticbeetleHydromedion sparsutum (Coleoptera, Perimylopidae) is common locally on the island of South Georgia where sub-zero temperatures can be experienced in any month of the year. Larvae were known to be weakly freeze tolerant in summer with a mean supercooling point (SCP) around −4°C...
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ftnerc:oai:nora.nerc.ac.uk:18366 2023-05-15T13:45:12+02:00 Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle Bale, J.S. Worland, M.R. Block, W. 2001 http://nora.nerc.ac.uk/id/eprint/18366/ http://www.sciencedirect.com/science/article/pii/S002219100100097X unknown Elsevier Bale, J.S.; Worland, M.R.; Block, W. 2001 Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle. Journal of Insect Physiology, 47 (10). 1161-1167. https://doi.org/10.1016/S0022-1910(01)00097-X <https://doi.org/10.1016/S0022-1910(01)00097-X> Publication - Article PeerReviewed 2001 ftnerc https://doi.org/10.1016/S0022-1910(01)00097-X 2023-02-04T19:31:42Z The sub-AntarcticbeetleHydromedion sparsutum (Coleoptera, Perimylopidae) is common locally on the island of South Georgia where sub-zero temperatures can be experienced in any month of the year. Larvae were known to be weakly freeze tolerant in summer with a mean supercooling point (SCP) around −4°C and a lower lethal temperature of −10°C (15 min exposure). This study investigated the effects of successive freezing exposures on the SCP and subsequent survival of summer acclimatised larvae. The mean SCP of field fresh larvae was −4.2±0.2°C with a range from −1.0 to −6.1°C. When larvae were cooled to −6.5°C on 10 occasions at intervals of 30 min and one and four days, survival was 44, 70 and 68%, respectively. The ‘end of experiment’ SCP of larvae surviving 10 exposures at −6.5°C showed distinct changes and patterns from the original field population depending on the interval between exposure. In the 30 min interval group, most larvae froze between −6 and −8°C, a depression of up to 6°C from the original sample; all larvae were dead when cooling was continued below the SCP to −12°C. In the one and four day interval groups, most larvae froze above −6°C, showing no change as a result of the 10 exposures at −6.5°C. As with the 30 min interval group, some larvae froze below −6°C, but with a wider range, and again, all were dead when cooled to −12°C. However, in the one and four day interval groups, some larvae remained unfrozen when cooled to −12°C, a depression of their individual SCP of at least 6°C, and were alive 24 h after cooling. In a further experiment, larvae were cooled to their individual SCP temperature at daily intervals on 10 occasions to ensure that every larva froze every day. Most larvae which showed a depression of their SCP of 2–4°C from their day one value became moribund or died after six or seven freezing events. Survival was highest in larvae with SCPs of −2 to −3°C on day one and which froze at this level on all 10 occasions. The results indicate that in larvae in which the SCP is lowered ... Article in Journal/Newspaper Antarc* Antarctic Natural Environment Research Council: NERC Open Research Archive Antarctic Journal of Insect Physiology 47 10 1161 1167 |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
The sub-AntarcticbeetleHydromedion sparsutum (Coleoptera, Perimylopidae) is common locally on the island of South Georgia where sub-zero temperatures can be experienced in any month of the year. Larvae were known to be weakly freeze tolerant in summer with a mean supercooling point (SCP) around −4°C and a lower lethal temperature of −10°C (15 min exposure). This study investigated the effects of successive freezing exposures on the SCP and subsequent survival of summer acclimatised larvae. The mean SCP of field fresh larvae was −4.2±0.2°C with a range from −1.0 to −6.1°C. When larvae were cooled to −6.5°C on 10 occasions at intervals of 30 min and one and four days, survival was 44, 70 and 68%, respectively. The ‘end of experiment’ SCP of larvae surviving 10 exposures at −6.5°C showed distinct changes and patterns from the original field population depending on the interval between exposure. In the 30 min interval group, most larvae froze between −6 and −8°C, a depression of up to 6°C from the original sample; all larvae were dead when cooling was continued below the SCP to −12°C. In the one and four day interval groups, most larvae froze above −6°C, showing no change as a result of the 10 exposures at −6.5°C. As with the 30 min interval group, some larvae froze below −6°C, but with a wider range, and again, all were dead when cooled to −12°C. However, in the one and four day interval groups, some larvae remained unfrozen when cooled to −12°C, a depression of their individual SCP of at least 6°C, and were alive 24 h after cooling. In a further experiment, larvae were cooled to their individual SCP temperature at daily intervals on 10 occasions to ensure that every larva froze every day. Most larvae which showed a depression of their SCP of 2–4°C from their day one value became moribund or died after six or seven freezing events. Survival was highest in larvae with SCPs of −2 to −3°C on day one and which froze at this level on all 10 occasions. The results indicate that in larvae in which the SCP is lowered ... |
format |
Article in Journal/Newspaper |
author |
Bale, J.S. Worland, M.R. Block, W. |
spellingShingle |
Bale, J.S. Worland, M.R. Block, W. Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle |
author_facet |
Bale, J.S. Worland, M.R. Block, W. |
author_sort |
Bale, J.S. |
title |
Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle |
title_short |
Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle |
title_full |
Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle |
title_fullStr |
Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle |
title_full_unstemmed |
Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle |
title_sort |
effect of summer frost exposures on the cold tolerance strategy of a sub-antarctic beetle |
publisher |
Elsevier |
publishDate |
2001 |
url |
http://nora.nerc.ac.uk/id/eprint/18366/ http://www.sciencedirect.com/science/article/pii/S002219100100097X |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Bale, J.S.; Worland, M.R.; Block, W. 2001 Effect of summer frost exposures on the cold tolerance strategy of a sub-Antarctic beetle. Journal of Insect Physiology, 47 (10). 1161-1167. https://doi.org/10.1016/S0022-1910(01)00097-X <https://doi.org/10.1016/S0022-1910(01)00097-X> |
op_doi |
https://doi.org/10.1016/S0022-1910(01)00097-X |
container_title |
Journal of Insect Physiology |
container_volume |
47 |
container_issue |
10 |
container_start_page |
1161 |
op_container_end_page |
1167 |
_version_ |
1766216664451383296 |