Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers
To verify the potential of fatty acids as trophic markers, feeding experiments were carried out with the dominant herbivorous copepods Ca/anus finmarchicus, C. hyperboreus and C. glacialis from the Greenland Sea during two Arctic expeditions in June/July 1991. Depending on the fatty acid composition...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
1994
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/1056/ https://hdl.handle.net/10013/epic.11643 |
id |
ftawi:oai:epic.awi.de:1056 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:1056 2024-09-15T17:44:08+00:00 Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers Graeve, Martin Kattner, Gerhard Hagen, W. 1994 https://epic.awi.de/id/eprint/1056/ https://hdl.handle.net/10013/epic.11643 unknown Graeve, M. orcid:0000-0002-2294-1915 , Kattner, G. and Hagen, W. (1994) Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers , Journal of Experimental Marine Biology and Ecology, 182 , pp. 97-110 . hdl:10013/epic.11643 EPIC3Journal of Experimental Marine Biology and Ecology, 182, pp. 97-110 Article isiRev 1994 ftawi 2024-06-24T03:53:34Z To verify the potential of fatty acids as trophic markers, feeding experiments were carried out with the dominant herbivorous copepods Ca/anus finmarchicus, C. hyperboreus and C. glacialis from the Greenland Sea during two Arctic expeditions in June/July 1991. Depending on the fatty acid composition of these copepods, the diatom Thalassiosira antarctica or the dinoflagellate Amphidinium carterae were offered as food to induce deviating fatty acid compositions. Since the copepodite Stages CV of C. finmarchicus had very low amounts of the 16: 1(n-7) fatty acid but high amounts of 18:4(n-3), the specimens were fed on T. antarctica rich in 16: 1(n-7) over a period of up to 42 days. At the end of the feeding experiment the portion of the 16:1(n-7) fatty acid had strongly increased by 11%, while the 18:4(n-3) fatty acid was almost depleted. In contrast, high amounts of the 16: l(n-7) fatty acid in C. hyperboreus (CV) suggested feeding on diatoms, therefore its diet was changed to A. carterae dominated by high amounts of the 18:4(n-3) fatty acid. After 47 days the portion of 18:4(n-3) increased by 8%, whereas 16:1(n-7) decreased by 3%. In female C. glacialis the changes in the fatty acid composition after feeding with A. carterae were less pronounced as compared to the other species, due to a severe lipid loss during the experiment. The feeding experiments document the incorporation and turnover of dietary fatty acids under controlled laboratory conditions and provide clear evidence for the potential of specific fatty acids as trophic marker lipids.Keywords: Arctic; Copepod; Feeding; Lipid; Fatty acid; Alcohol; Trophic marker Article in Journal/Newspaper Antarc* Antarctica Arctic Arctic copepod Greenland Greenland Sea Copepods Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
To verify the potential of fatty acids as trophic markers, feeding experiments were carried out with the dominant herbivorous copepods Ca/anus finmarchicus, C. hyperboreus and C. glacialis from the Greenland Sea during two Arctic expeditions in June/July 1991. Depending on the fatty acid composition of these copepods, the diatom Thalassiosira antarctica or the dinoflagellate Amphidinium carterae were offered as food to induce deviating fatty acid compositions. Since the copepodite Stages CV of C. finmarchicus had very low amounts of the 16: 1(n-7) fatty acid but high amounts of 18:4(n-3), the specimens were fed on T. antarctica rich in 16: 1(n-7) over a period of up to 42 days. At the end of the feeding experiment the portion of the 16:1(n-7) fatty acid had strongly increased by 11%, while the 18:4(n-3) fatty acid was almost depleted. In contrast, high amounts of the 16: l(n-7) fatty acid in C. hyperboreus (CV) suggested feeding on diatoms, therefore its diet was changed to A. carterae dominated by high amounts of the 18:4(n-3) fatty acid. After 47 days the portion of 18:4(n-3) increased by 8%, whereas 16:1(n-7) decreased by 3%. In female C. glacialis the changes in the fatty acid composition after feeding with A. carterae were less pronounced as compared to the other species, due to a severe lipid loss during the experiment. The feeding experiments document the incorporation and turnover of dietary fatty acids under controlled laboratory conditions and provide clear evidence for the potential of specific fatty acids as trophic marker lipids.Keywords: Arctic; Copepod; Feeding; Lipid; Fatty acid; Alcohol; Trophic marker |
format |
Article in Journal/Newspaper |
author |
Graeve, Martin Kattner, Gerhard Hagen, W. |
spellingShingle |
Graeve, Martin Kattner, Gerhard Hagen, W. Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers |
author_facet |
Graeve, Martin Kattner, Gerhard Hagen, W. |
author_sort |
Graeve, Martin |
title |
Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers |
title_short |
Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers |
title_full |
Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers |
title_fullStr |
Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers |
title_full_unstemmed |
Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers |
title_sort |
diet-induced changes in the fatty acid composition of arctic herbivorous copepods: experimental evidence of trophic markers |
publishDate |
1994 |
url |
https://epic.awi.de/id/eprint/1056/ https://hdl.handle.net/10013/epic.11643 |
genre |
Antarc* Antarctica Arctic Arctic copepod Greenland Greenland Sea Copepods |
genre_facet |
Antarc* Antarctica Arctic Arctic copepod Greenland Greenland Sea Copepods |
op_source |
EPIC3Journal of Experimental Marine Biology and Ecology, 182, pp. 97-110 |
op_relation |
Graeve, M. orcid:0000-0002-2294-1915 , Kattner, G. and Hagen, W. (1994) Diet-induced changes in the fatty acid composition of Arctic herbivorous copepods: Experimental evidence of trophic markers , Journal of Experimental Marine Biology and Ecology, 182 , pp. 97-110 . hdl:10013/epic.11643 |
_version_ |
1810491490751741952 |