RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND
Abstract Two behavioural extraction techniques, wet and dry extraction, were evaluated as to their relative efficiencies in removing invertebrates from samples of wet peat collected from a fen near Schefferville, Quebec. Dry extraction involved drying a substrate sample from above, forcing any macro...
Published in: | Memoirs of the Entomological Society of Canada |
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Language: | English |
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Cambridge University Press (CUP)
1994
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Online Access: | http://dx.doi.org/10.4039/entm126169285-1 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0071075X00004148 |
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crcambridgeupr:10.4039/entm126169285-1 2023-05-15T18:28:23+02:00 RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND McElligott, Paul E.K. Lewis, David J. 1994 http://dx.doi.org/10.4039/entm126169285-1 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0071075X00004148 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Memoirs of the Entomological Society of Canada volume 126, issue S169, page 285-289 ISSN 0071-075X journal-article 1994 crcambridgeupr https://doi.org/10.4039/entm126169285-1 2022-04-07T08:05:53Z Abstract Two behavioural extraction techniques, wet and dry extraction, were evaluated as to their relative efficiencies in removing invertebrates from samples of wet peat collected from a fen near Schefferville, Quebec. Dry extraction involved drying a substrate sample from above, forcing any macroinvertebrates contained therein to move downward out of the substrate matrix. In wet extraction, peat samples were suspended in a water bath where a vertical temperature-dissolved oxygen gradient had been established; invertebrates responded to the gradient by moving downward out of the sample and into the water bath. Wet extraction yielded approximately three times more invertebrates per unit volume of substrate than dry extraction, but the two extraction methods differed considerably in their ability to extract different invertebrate taxa. Dry extraction was more effective than wet for obtaining larvae of Tabanidae, Tipulidae, Empididae, and Dolichopodidae, but larval Chironomidae, sphaeriid clams, and oligochaete worms were collected more efficiently by wet extraction. Other invertebrate taxa were collected with approximately equal efficiency by both methods. Article in Journal/Newspaper Subarctic Cambridge University Press (via Crossref) Memoirs of the Entomological Society of Canada 126 S169 285 289 |
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Open Polar |
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Cambridge University Press (via Crossref) |
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crcambridgeupr |
language |
English |
description |
Abstract Two behavioural extraction techniques, wet and dry extraction, were evaluated as to their relative efficiencies in removing invertebrates from samples of wet peat collected from a fen near Schefferville, Quebec. Dry extraction involved drying a substrate sample from above, forcing any macroinvertebrates contained therein to move downward out of the substrate matrix. In wet extraction, peat samples were suspended in a water bath where a vertical temperature-dissolved oxygen gradient had been established; invertebrates responded to the gradient by moving downward out of the sample and into the water bath. Wet extraction yielded approximately three times more invertebrates per unit volume of substrate than dry extraction, but the two extraction methods differed considerably in their ability to extract different invertebrate taxa. Dry extraction was more effective than wet for obtaining larvae of Tabanidae, Tipulidae, Empididae, and Dolichopodidae, but larval Chironomidae, sphaeriid clams, and oligochaete worms were collected more efficiently by wet extraction. Other invertebrate taxa were collected with approximately equal efficiency by both methods. |
format |
Article in Journal/Newspaper |
author |
McElligott, Paul E.K. Lewis, David J. |
spellingShingle |
McElligott, Paul E.K. Lewis, David J. RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND |
author_facet |
McElligott, Paul E.K. Lewis, David J. |
author_sort |
McElligott, Paul E.K. |
title |
RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND |
title_short |
RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND |
title_full |
RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND |
title_fullStr |
RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND |
title_full_unstemmed |
RELATIVE EFFICIENCIES OF WET AND DRY EXTRACTION TECHNIQUES FOR SAMPLING AQUATIC MACROINVERTEBRATES IN A SUBARCTIC PEATLAND |
title_sort |
relative efficiencies of wet and dry extraction techniques for sampling aquatic macroinvertebrates in a subarctic peatland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1994 |
url |
http://dx.doi.org/10.4039/entm126169285-1 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0071075X00004148 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Memoirs of the Entomological Society of Canada volume 126, issue S169, page 285-289 ISSN 0071-075X |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.4039/entm126169285-1 |
container_title |
Memoirs of the Entomological Society of Canada |
container_volume |
126 |
container_issue |
S169 |
container_start_page |
285 |
op_container_end_page |
289 |
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1766210838595633152 |