Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica
Daily changes in microclimate temperature and supercooling point (SCP) of Collembola were measured during summer at Cape Hallett, North Victoria Land, Antarctica. Isotoma klovstadi and Cryptopygus cisantarcticus (Isotomidae) showed bimodal SCP distributions, predominantly in the high group during th...
Published in: | Journal of Insect Physiology |
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Online Access: | http://hdl.handle.net/10019.1/11290 https://doi.org/10.1016/j.jinsphys.2003.08.002 |
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ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/11290 2023-11-12T04:08:15+01:00 Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica Sinclair B.J. Klok C.J. Scott M.B. Terblanche J.S. Chown S.L. 2003 http://hdl.handle.net/10019.1/11290 https://doi.org/10.1016/j.jinsphys.2003.08.002 unknown Journal of Insect Physiology 49 11 221910 doi:10.1016/j.jinsphys.2003.08.002 http://hdl.handle.net/10019.1/11290 microclimate acclimatization animal animal food Antarctica arthropod article body water circadian rhythm cold hemolymph metabolism osmolarity physiology season starvation statistical distribution temperature time Animal Nutrition Physiology Animals Antarctic Regions Arthropods Osmolar Concentration Seasons Statistical Distributions Time Factors algae Animalia Bryophyta Collembola Cryptopygus Friesea Friesea grisea Isotoma klovstadi Isotomidae Neanuridae Victoria Article 2003 ftunstellenbosch https://doi.org/10.1016/j.jinsphys.2003.08.002 2023-10-22T07:20:42Z Daily changes in microclimate temperature and supercooling point (SCP) of Collembola were measured during summer at Cape Hallett, North Victoria Land, Antarctica. Isotoma klovstadi and Cryptopygus cisantarcticus (Isotomidae) showed bimodal SCP distributions, predominantly in the high group during the day and in the low group during the night. There were no concurrent diurnal changes in water content or haemolymph osmolality. By contrast, Friesea grisea (Neanuridae) had a unimodal distribution of SCPs that was invariant between daytime and nighttime. Isotoma klovstadi collected foraging on moss had uniformly high SCPs, which shifted towards the low group when the animals were starved for 2-8 h. When I. klovstadi was acclimated for five days with lichen or algae, SCPs were higher than if they were supplied with moss, while those that were starved (with free water or 100% relative humidity) displayed a trimodal SCP distribution. A variety of pre-treatments, including cold, heat, desiccation and slow cooling were ineffective at inducing SCP shifts in C. cisantarcticus or I. klovstadi. It is postulated that behavioural avoidance of low temperatures by vertical migration may be key in I. klovstadi's short-term survival of nighttime temperatures. These data suggest that the full range of thermal responses of Antarctic Collembola is yet to be elucidated. © 2003 Elsevier Ltd. All rights reserved. Article Article in Journal/Newspaper Antarc* Antarctic Antarctica Victoria Land Stellenbosch University: SUNScholar Research Repository Antarctic Cape Hallett ENVELOPE(170.217,170.217,-72.317,-72.317) Hallett ENVELOPE(170.217,170.217,-72.317,-72.317) Victoria Land Journal of Insect Physiology 49 11 1049 1061 |
institution |
Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
unknown |
topic |
microclimate acclimatization animal animal food Antarctica arthropod article body water circadian rhythm cold hemolymph metabolism osmolarity physiology season starvation statistical distribution temperature time Animal Nutrition Physiology Animals Antarctic Regions Arthropods Osmolar Concentration Seasons Statistical Distributions Time Factors algae Animalia Bryophyta Collembola Cryptopygus Friesea Friesea grisea Isotoma klovstadi Isotomidae Neanuridae Victoria |
spellingShingle |
microclimate acclimatization animal animal food Antarctica arthropod article body water circadian rhythm cold hemolymph metabolism osmolarity physiology season starvation statistical distribution temperature time Animal Nutrition Physiology Animals Antarctic Regions Arthropods Osmolar Concentration Seasons Statistical Distributions Time Factors algae Animalia Bryophyta Collembola Cryptopygus Friesea Friesea grisea Isotoma klovstadi Isotomidae Neanuridae Victoria Sinclair B.J. Klok C.J. Scott M.B. Terblanche J.S. Chown S.L. Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica |
topic_facet |
microclimate acclimatization animal animal food Antarctica arthropod article body water circadian rhythm cold hemolymph metabolism osmolarity physiology season starvation statistical distribution temperature time Animal Nutrition Physiology Animals Antarctic Regions Arthropods Osmolar Concentration Seasons Statistical Distributions Time Factors algae Animalia Bryophyta Collembola Cryptopygus Friesea Friesea grisea Isotoma klovstadi Isotomidae Neanuridae Victoria |
description |
Daily changes in microclimate temperature and supercooling point (SCP) of Collembola were measured during summer at Cape Hallett, North Victoria Land, Antarctica. Isotoma klovstadi and Cryptopygus cisantarcticus (Isotomidae) showed bimodal SCP distributions, predominantly in the high group during the day and in the low group during the night. There were no concurrent diurnal changes in water content or haemolymph osmolality. By contrast, Friesea grisea (Neanuridae) had a unimodal distribution of SCPs that was invariant between daytime and nighttime. Isotoma klovstadi collected foraging on moss had uniformly high SCPs, which shifted towards the low group when the animals were starved for 2-8 h. When I. klovstadi was acclimated for five days with lichen or algae, SCPs were higher than if they were supplied with moss, while those that were starved (with free water or 100% relative humidity) displayed a trimodal SCP distribution. A variety of pre-treatments, including cold, heat, desiccation and slow cooling were ineffective at inducing SCP shifts in C. cisantarcticus or I. klovstadi. It is postulated that behavioural avoidance of low temperatures by vertical migration may be key in I. klovstadi's short-term survival of nighttime temperatures. These data suggest that the full range of thermal responses of Antarctic Collembola is yet to be elucidated. © 2003 Elsevier Ltd. All rights reserved. Article |
format |
Article in Journal/Newspaper |
author |
Sinclair B.J. Klok C.J. Scott M.B. Terblanche J.S. Chown S.L. |
author_facet |
Sinclair B.J. Klok C.J. Scott M.B. Terblanche J.S. Chown S.L. |
author_sort |
Sinclair B.J. |
title |
Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica |
title_short |
Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica |
title_full |
Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica |
title_fullStr |
Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica |
title_full_unstemmed |
Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica |
title_sort |
diurnal variation in supercooling points of three species of collembola from cape hallett, antarctica |
publishDate |
2003 |
url |
http://hdl.handle.net/10019.1/11290 https://doi.org/10.1016/j.jinsphys.2003.08.002 |
long_lat |
ENVELOPE(170.217,170.217,-72.317,-72.317) ENVELOPE(170.217,170.217,-72.317,-72.317) |
geographic |
Antarctic Cape Hallett Hallett Victoria Land |
geographic_facet |
Antarctic Cape Hallett Hallett Victoria Land |
genre |
Antarc* Antarctic Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Victoria Land |
op_relation |
Journal of Insect Physiology 49 11 221910 doi:10.1016/j.jinsphys.2003.08.002 http://hdl.handle.net/10019.1/11290 |
op_doi |
https://doi.org/10.1016/j.jinsphys.2003.08.002 |
container_title |
Journal of Insect Physiology |
container_volume |
49 |
container_issue |
11 |
container_start_page |
1049 |
op_container_end_page |
1061 |
_version_ |
1782328593208049664 |