Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic
We report the results of the first study of the population dynamics and life cycles of Arctic enchytraeid populations. Sampling was undertaken in a Salix heath in Adventdalen, Svalbard, during one summer and the succeeding spring. In addition, a Cassiope heath at a more northerly site close to Ny-Ål...
Published in: | Canadian Journal of Zoology |
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Online Access: | http://dx.doi.org/10.1139/z00-148 http://www.nrcresearchpress.com/doi/pdf/10.1139/z00-148 |
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crcansciencepubl:10.1139/z00-148 2024-05-19T07:27:30+00:00 Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic Birkemoe, T Coulson, S J Sømme, L 2000 http://dx.doi.org/10.1139/z00-148 http://www.nrcresearchpress.com/doi/pdf/10.1139/z00-148 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 78, issue 12, page 2079-2086 ISSN 0008-4301 1480-3283 journal-article 2000 crcansciencepubl https://doi.org/10.1139/z00-148 2024-05-02T06:51:24Z We report the results of the first study of the population dynamics and life cycles of Arctic enchytraeid populations. Sampling was undertaken in a Salix heath in Adventdalen, Svalbard, during one summer and the succeeding spring. In addition, a Cassiope heath at a more northerly site close to Ny-Ålesund, Svalbard, was sampled twice. The Arctic enchytraeids were generally smaller at maturity than their temperate-zone relatives. The three most numerous species in the Salix heath, Henlea perpusilla, Henlea glandulifera, and Bryodrilus parvus, hatched from cocoons in early summer and attained adult size early in their second summer. A few H. perpusilla and H. glandulifera reached mature size in their first summer; since the summer of investigation was unusually cold, these species may have a 1-year life cycle in warmer years. Life cycles were apparently longer in the Cassiope heath than in the Salix heath. Henlea perpusilla, H. glandulifera, and B. parvus produced eggs throughout the summer in the Salix heath, though hatching was restricted to early summer. Therefore, the hypothesis that cocoons require a cold period to hatch was tested in a laboratory experiment. When soil containing cocoons was incubated at -5°C for 3 weeks, a significant increase in juveniles was demonstrated for H. perpusilla and Bryodrilus diverticulatus compared with soils kept at constant summer temperatures. This is the first time that breaking of dormancy by an external stimulus has been demonstrated in enchytraeid cocoons. Article in Journal/Newspaper Adventdalen Arctic Ny Ålesund Ny-Ålesund Svalbard Canadian Science Publishing Canadian Journal of Zoology 78 12 2079 2086 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We report the results of the first study of the population dynamics and life cycles of Arctic enchytraeid populations. Sampling was undertaken in a Salix heath in Adventdalen, Svalbard, during one summer and the succeeding spring. In addition, a Cassiope heath at a more northerly site close to Ny-Ålesund, Svalbard, was sampled twice. The Arctic enchytraeids were generally smaller at maturity than their temperate-zone relatives. The three most numerous species in the Salix heath, Henlea perpusilla, Henlea glandulifera, and Bryodrilus parvus, hatched from cocoons in early summer and attained adult size early in their second summer. A few H. perpusilla and H. glandulifera reached mature size in their first summer; since the summer of investigation was unusually cold, these species may have a 1-year life cycle in warmer years. Life cycles were apparently longer in the Cassiope heath than in the Salix heath. Henlea perpusilla, H. glandulifera, and B. parvus produced eggs throughout the summer in the Salix heath, though hatching was restricted to early summer. Therefore, the hypothesis that cocoons require a cold period to hatch was tested in a laboratory experiment. When soil containing cocoons was incubated at -5°C for 3 weeks, a significant increase in juveniles was demonstrated for H. perpusilla and Bryodrilus diverticulatus compared with soils kept at constant summer temperatures. This is the first time that breaking of dormancy by an external stimulus has been demonstrated in enchytraeid cocoons. |
format |
Article in Journal/Newspaper |
author |
Birkemoe, T Coulson, S J Sømme, L |
spellingShingle |
Birkemoe, T Coulson, S J Sømme, L Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic |
author_facet |
Birkemoe, T Coulson, S J Sømme, L |
author_sort |
Birkemoe, T |
title |
Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic |
title_short |
Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic |
title_full |
Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic |
title_fullStr |
Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic |
title_full_unstemmed |
Life cycles and population dynamics of enchytraeids (Oligochaeta) from the High Arctic |
title_sort |
life cycles and population dynamics of enchytraeids (oligochaeta) from the high arctic |
publisher |
Canadian Science Publishing |
publishDate |
2000 |
url |
http://dx.doi.org/10.1139/z00-148 http://www.nrcresearchpress.com/doi/pdf/10.1139/z00-148 |
genre |
Adventdalen Arctic Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Adventdalen Arctic Ny Ålesund Ny-Ålesund Svalbard |
op_source |
Canadian Journal of Zoology volume 78, issue 12, page 2079-2086 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z00-148 |
container_title |
Canadian Journal of Zoology |
container_volume |
78 |
container_issue |
12 |
container_start_page |
2079 |
op_container_end_page |
2086 |
_version_ |
1799478093703806976 |