Cold hardiness of Collembola at Signy Island, maritime Antarctic
The cold hardiness of two Antarctic species of Collembola, Cryptopygus antarcticus Willem and Parisotoma octooculata (Willem), was studied in field fresh, starved and low temperature acclimated specimens at Signy Island, in the South Orkney Islands. Supercooling points of both species clearly fell i...
Published in: | Oikos |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Nordic Society Oikos
1982
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/524500/ https://doi.org/10.2307/3544016 |
id |
ftnerc:oai:nora.nerc.ac.uk:524500 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:524500 2023-05-15T13:41:44+02:00 Cold hardiness of Collembola at Signy Island, maritime Antarctic Sømme, Lauritz Block, William 1982 http://nora.nerc.ac.uk/id/eprint/524500/ https://doi.org/10.2307/3544016 unknown Nordic Society Oikos Sømme, Lauritz; Block, William. 1982 Cold hardiness of Collembola at Signy Island, maritime Antarctic. Oikos, 38 (2). 168-176. https://doi.org/10.2307/3544016 <https://doi.org/10.2307/3544016> Publication - Article PeerReviewed 1982 ftnerc https://doi.org/10.2307/3544016 2023-02-04T19:48:53Z The cold hardiness of two Antarctic species of Collembola, Cryptopygus antarcticus Willem and Parisotoma octooculata (Willem), was studied in field fresh, starved and low temperature acclimated specimens at Signy Island, in the South Orkney Islands. Supercooling points of both species clearly fell in a high group (HG) and a low group (LG) with a division at ca. -15°C. Field fresh specimens mainly had HG supercooling points, while starvation at 5° and 15°C greatly increased the number of LG animals. Further evidence of the relation between supercooling and feeding status was obtained in C. antarcticus. Specimens fed moss turf homogenate almost entirely returned to HG supercooling points, indicating the presence of efficient nucleators in this substrate. In specimens fed purified green algae a high proportion of LG supercooling points was retained, which suggests a lack of nucleators in this kind of food. Increased ability of LG specimens to supercool was demonstrated in C. antarcticus following acclimation at -5°C, and in P. octooculata at 0°C. In C. antarcticus an increase in concentrations of cryoprotective substances took place at -5°C concurrent with the lowering of the mean supercooling point. The main substances of the multicomponent cryoprotectant system of this species were trehalose, mannitol and glycerol. Chill-coma temperatures of specimens collected in the field differed in C. antarcticus and P. octooculata with mean values of -8.3° and -4.8°C, respectively. P. octooculata was less resistant to anaerobic conditions than C. antarcticus. All specimens of the former species were killed within 8 d in nitrogen at 0°C, while ca. 30% of C. antarcticus specimens survived after 28 d. Article in Journal/Newspaper Antarc* Antarctic antarcticus Cryptopygus antarcticus Signy Island South Orkney Islands Natural Environment Research Council: NERC Open Research Archive Antarctic South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Signy Island ENVELOPE(-45.595,-45.595,-60.708,-60.708) Oikos 38 2 168 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
The cold hardiness of two Antarctic species of Collembola, Cryptopygus antarcticus Willem and Parisotoma octooculata (Willem), was studied in field fresh, starved and low temperature acclimated specimens at Signy Island, in the South Orkney Islands. Supercooling points of both species clearly fell in a high group (HG) and a low group (LG) with a division at ca. -15°C. Field fresh specimens mainly had HG supercooling points, while starvation at 5° and 15°C greatly increased the number of LG animals. Further evidence of the relation between supercooling and feeding status was obtained in C. antarcticus. Specimens fed moss turf homogenate almost entirely returned to HG supercooling points, indicating the presence of efficient nucleators in this substrate. In specimens fed purified green algae a high proportion of LG supercooling points was retained, which suggests a lack of nucleators in this kind of food. Increased ability of LG specimens to supercool was demonstrated in C. antarcticus following acclimation at -5°C, and in P. octooculata at 0°C. In C. antarcticus an increase in concentrations of cryoprotective substances took place at -5°C concurrent with the lowering of the mean supercooling point. The main substances of the multicomponent cryoprotectant system of this species were trehalose, mannitol and glycerol. Chill-coma temperatures of specimens collected in the field differed in C. antarcticus and P. octooculata with mean values of -8.3° and -4.8°C, respectively. P. octooculata was less resistant to anaerobic conditions than C. antarcticus. All specimens of the former species were killed within 8 d in nitrogen at 0°C, while ca. 30% of C. antarcticus specimens survived after 28 d. |
format |
Article in Journal/Newspaper |
author |
Sømme, Lauritz Block, William |
spellingShingle |
Sømme, Lauritz Block, William Cold hardiness of Collembola at Signy Island, maritime Antarctic |
author_facet |
Sømme, Lauritz Block, William |
author_sort |
Sømme, Lauritz |
title |
Cold hardiness of Collembola at Signy Island, maritime Antarctic |
title_short |
Cold hardiness of Collembola at Signy Island, maritime Antarctic |
title_full |
Cold hardiness of Collembola at Signy Island, maritime Antarctic |
title_fullStr |
Cold hardiness of Collembola at Signy Island, maritime Antarctic |
title_full_unstemmed |
Cold hardiness of Collembola at Signy Island, maritime Antarctic |
title_sort |
cold hardiness of collembola at signy island, maritime antarctic |
publisher |
Nordic Society Oikos |
publishDate |
1982 |
url |
http://nora.nerc.ac.uk/id/eprint/524500/ https://doi.org/10.2307/3544016 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) ENVELOPE(-45.595,-45.595,-60.708,-60.708) |
geographic |
Antarctic South Orkney Islands Signy Island |
geographic_facet |
Antarctic South Orkney Islands Signy Island |
genre |
Antarc* Antarctic antarcticus Cryptopygus antarcticus Signy Island South Orkney Islands |
genre_facet |
Antarc* Antarctic antarcticus Cryptopygus antarcticus Signy Island South Orkney Islands |
op_relation |
Sømme, Lauritz; Block, William. 1982 Cold hardiness of Collembola at Signy Island, maritime Antarctic. Oikos, 38 (2). 168-176. https://doi.org/10.2307/3544016 <https://doi.org/10.2307/3544016> |
op_doi |
https://doi.org/10.2307/3544016 |
container_title |
Oikos |
container_volume |
38 |
container_issue |
2 |
container_start_page |
168 |
_version_ |
1766155546257260544 |