Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica
The environmental physiology of three speciesof Collembola: Cryptopygus cisantarcticus, Isotoma klovstadi (Isotomidae) and Friesea grisea (Neanuridae) was investigated from November 2002 to February 2003 at Cape Hallett, North Victoria Land, Antarctica. All three species were freeze avoiding, and wh...
Published in: | Journal of Insect Physiology |
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Online Access: | http://hdl.handle.net/10019.1/11283 https://doi.org/10.1016/j.jinsphys.2005.09.002 |
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ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/11283 2023-05-15T13:54:33+02:00 Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica Sinclair B.J. Terblanche J.S. Scott M.B. Blatch G.L. Jaco Klok C. Chown S.L. 2006 http://hdl.handle.net/10019.1/11283 https://doi.org/10.1016/j.jinsphys.2005.09.002 unknown antifreeze protein insect protein beetle freeze tolerance osmoregulation physiology animal Antarctica article chemistry cold desiccation electrolyte balance hemolymph insect metabolism microclimate osmolarity temperature Animals Antarctic Regions Antifreeze Proteins Insect Proteins Insects Osmolar Concentration Water-Electrolyte Balance East Antarctica Victoria Land Animalia Collembola Cryptopygus Desoria klovstadi Friesea grisea Isotomidae Neanuridae Article 2006 ftunstellenbosch https://doi.org/10.1016/j.jinsphys.2005.09.002 2018-10-27T11:27:01Z The environmental physiology of three speciesof Collembola: Cryptopygus cisantarcticus, Isotoma klovstadi (Isotomidae) and Friesea grisea (Neanuridae) was investigated from November 2002 to February 2003 at Cape Hallett, North Victoria Land, Antarctica. All three species were freeze avoiding, and while supercooling points were variable on seasonal and daily scales in I. klovstadi and C. cisantarcticus, they remained largely static in F. grisea. LT50 (temperature where 50% of animals are killed by cold) was -13.6, -19.1 and -19.8°C for C. cisantarcticus, I. klovstadi and F. grisea, respectively. Upper lethal temperature was 34, 34 and 38°C for C. cisantarcticus, I. klovstadi and F. grisea. Critical thermal minimum onset (the temperature where individuals entered chill coma) was ca. -7, -12 and -8°C for C. cisantarcticus, I. klovstadi and F. grisea, and 25% of I. klovstadi individuals froze without entering chill coma. Critical thermal maximum (the onset of spasms at high temperature) was 30, 33 and 34°C for C. cisantarcticus, I. klovstadi and F. grisea. Haemolymph osmolality was approximately 720 mOsm for C. cisantarcticus and 680 mOsm for I. klovstadi, and both species showed a moderate degree of thermal hysteresis, which persisted through the season. Desiccation resistance was measured as survival above silica gel, and the species survived in the rank order of C. cisantarcticus≪I. klovstadi=F. grisea. Desiccation resulted in an increase in haemolymph osmolality in I. klovstadi, and water was quickly regained by desiccation-stressed individuals that had access to liquid water, but not by individuals placed in high humidity, indicating that this species is unable to absorb atmospheric water vapour. SDS-PAGE did not suggest any strong patterns in protein synthesis either seasonally or in response to temperature or desiccation stress. Microclimate temperatures were measured at sites representative of collection sites for the three species. Microclimate temperatures were highly variable on a diurnal and weekly scale (the latter relating to weather patterns), but showed little overall variation across the summer season. Potentially lethal high and low temperatures were recorded at several sites, and it is suggested that these temperature extremes account for the observed restriction of the less-tolerant C. cisantarcticus at Cape Hallett. Together, these data significantly increase the current knowledge of the environmental physiology of Antarctic Collembola. © 2005 Elsevier Ltd. All rights reserved. Article Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Victoria Land Stellenbosch University: SUNScholar Research Repository Antarctic Cape Hallett ENVELOPE(170.217,170.217,-72.317,-72.317) East Antarctica Hallett ENVELOPE(170.217,170.217,-72.317,-72.317) Victoria Land Journal of Insect Physiology 52 1 29 50 |
institution |
Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
unknown |
topic |
antifreeze protein insect protein beetle freeze tolerance osmoregulation physiology animal Antarctica article chemistry cold desiccation electrolyte balance hemolymph insect metabolism microclimate osmolarity temperature Animals Antarctic Regions Antifreeze Proteins Insect Proteins Insects Osmolar Concentration Water-Electrolyte Balance East Antarctica Victoria Land Animalia Collembola Cryptopygus Desoria klovstadi Friesea grisea Isotomidae Neanuridae |
spellingShingle |
antifreeze protein insect protein beetle freeze tolerance osmoregulation physiology animal Antarctica article chemistry cold desiccation electrolyte balance hemolymph insect metabolism microclimate osmolarity temperature Animals Antarctic Regions Antifreeze Proteins Insect Proteins Insects Osmolar Concentration Water-Electrolyte Balance East Antarctica Victoria Land Animalia Collembola Cryptopygus Desoria klovstadi Friesea grisea Isotomidae Neanuridae Sinclair B.J. Terblanche J.S. Scott M.B. Blatch G.L. Jaco Klok C. Chown S.L. Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica |
topic_facet |
antifreeze protein insect protein beetle freeze tolerance osmoregulation physiology animal Antarctica article chemistry cold desiccation electrolyte balance hemolymph insect metabolism microclimate osmolarity temperature Animals Antarctic Regions Antifreeze Proteins Insect Proteins Insects Osmolar Concentration Water-Electrolyte Balance East Antarctica Victoria Land Animalia Collembola Cryptopygus Desoria klovstadi Friesea grisea Isotomidae Neanuridae |
description |
The environmental physiology of three speciesof Collembola: Cryptopygus cisantarcticus, Isotoma klovstadi (Isotomidae) and Friesea grisea (Neanuridae) was investigated from November 2002 to February 2003 at Cape Hallett, North Victoria Land, Antarctica. All three species were freeze avoiding, and while supercooling points were variable on seasonal and daily scales in I. klovstadi and C. cisantarcticus, they remained largely static in F. grisea. LT50 (temperature where 50% of animals are killed by cold) was -13.6, -19.1 and -19.8°C for C. cisantarcticus, I. klovstadi and F. grisea, respectively. Upper lethal temperature was 34, 34 and 38°C for C. cisantarcticus, I. klovstadi and F. grisea. Critical thermal minimum onset (the temperature where individuals entered chill coma) was ca. -7, -12 and -8°C for C. cisantarcticus, I. klovstadi and F. grisea, and 25% of I. klovstadi individuals froze without entering chill coma. Critical thermal maximum (the onset of spasms at high temperature) was 30, 33 and 34°C for C. cisantarcticus, I. klovstadi and F. grisea. Haemolymph osmolality was approximately 720 mOsm for C. cisantarcticus and 680 mOsm for I. klovstadi, and both species showed a moderate degree of thermal hysteresis, which persisted through the season. Desiccation resistance was measured as survival above silica gel, and the species survived in the rank order of C. cisantarcticus≪I. klovstadi=F. grisea. Desiccation resulted in an increase in haemolymph osmolality in I. klovstadi, and water was quickly regained by desiccation-stressed individuals that had access to liquid water, but not by individuals placed in high humidity, indicating that this species is unable to absorb atmospheric water vapour. SDS-PAGE did not suggest any strong patterns in protein synthesis either seasonally or in response to temperature or desiccation stress. Microclimate temperatures were measured at sites representative of collection sites for the three species. Microclimate temperatures were highly variable on a diurnal and weekly scale (the latter relating to weather patterns), but showed little overall variation across the summer season. Potentially lethal high and low temperatures were recorded at several sites, and it is suggested that these temperature extremes account for the observed restriction of the less-tolerant C. cisantarcticus at Cape Hallett. Together, these data significantly increase the current knowledge of the environmental physiology of Antarctic Collembola. © 2005 Elsevier Ltd. All rights reserved. Article |
format |
Article in Journal/Newspaper |
author |
Sinclair B.J. Terblanche J.S. Scott M.B. Blatch G.L. Jaco Klok C. Chown S.L. |
author_facet |
Sinclair B.J. Terblanche J.S. Scott M.B. Blatch G.L. Jaco Klok C. Chown S.L. |
author_sort |
Sinclair B.J. |
title |
Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica |
title_short |
Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica |
title_full |
Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica |
title_fullStr |
Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica |
title_full_unstemmed |
Environmental physiology of three species of Collembola at Cape Hallett, North Victoria Land, Antarctica |
title_sort |
environmental physiology of three species of collembola at cape hallett, north victoria land, antarctica |
publishDate |
2006 |
url |
http://hdl.handle.net/10019.1/11283 https://doi.org/10.1016/j.jinsphys.2005.09.002 |
long_lat |
ENVELOPE(170.217,170.217,-72.317,-72.317) ENVELOPE(170.217,170.217,-72.317,-72.317) |
geographic |
Antarctic Cape Hallett East Antarctica Hallett Victoria Land |
geographic_facet |
Antarctic Cape Hallett East Antarctica Hallett Victoria Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Victoria Land |
op_doi |
https://doi.org/10.1016/j.jinsphys.2005.09.002 |
container_title |
Journal of Insect Physiology |
container_volume |
52 |
container_issue |
1 |
container_start_page |
29 |
op_container_end_page |
50 |
_version_ |
1766260536244174848 |