Trophic position of coexisting krill species: a stable isotope approach
Four krill species with overlapping functional biology coexist in Greenland waters. Here, we used stable isotopes to investigate and discuss their trophic role and mode of coexistence. Bulk carbon (δ13C) and nitrogen (δ15N) stable isotope analyses of Thysanoessa longicaudata, T. inermis, T. raschii...
Published in: | Marine Ecology Progress Series |
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ftdtupubl:oai:pure.atira.dk:publications/6b1f88ee-43d6-4a2a-adee-5c2bf876aef8 2024-05-19T07:40:51+00:00 Trophic position of coexisting krill species: a stable isotope approach Agersted, Mette Dalgaard Bode, Antonio Nielsen, Torkel Gissel 2014 application/pdf https://orbit.dtu.dk/en/publications/6b1f88ee-43d6-4a2a-adee-5c2bf876aef8 https://doi.org/10.3354/meps11055 https://backend.orbit.dtu.dk/ws/files/103086207/Publishers_version.pdf eng eng info:eu-repo/grantAgreement/EC/FP7/264933 https://orbit.dtu.dk/en/publications/6b1f88ee-43d6-4a2a-adee-5c2bf876aef8 info:eu-repo/semantics/openAccess Agersted , M D , Bode , A & Nielsen , T G 2014 , ' Trophic position of coexisting krill species: a stable isotope approach ' , Marine Ecology Progress Series , vol. 516 , pp. 139-151 . https://doi.org/10.3354/meps11055 article 2014 ftdtupubl https://doi.org/10.3354/meps11055 2024-04-24T00:35:24Z Four krill species with overlapping functional biology coexist in Greenland waters. Here, we used stable isotopes to investigate and discuss their trophic role and mode of coexistence. Bulk carbon (δ13C) and nitrogen (δ15N) stable isotope analyses of Thysanoessa longicaudata, T. inermis, T. raschii and Meganyctiphanes norvegica sampled in June 2010 in the Godthåbsfjord, SW Greenland revealed new insight into their trophic roles and positions. There was a general positive correlation between body length and trophic position. The largest species M. norvegica had the highest trophic position (TP = 2.8 ± 0.2) indicating carnivory, while T. inermis (TP = 2.4 ± 0.3) had a more omnivorous diet. In turn, T. longicaudata and T. raschii (TP = 2.2 ± 0.2) were herbivorous. Along the fjord, nutrient and plankton composition affected trophic position. Thysanoessa longicaudata was more omnivorous offshore than inshore where it had the same trophic position as the baseline primary consumer Calanus spp. Similarly, T. raschii and T. inermis had higher trophic positions in the mouth of the fjord compared to the inner fjord. Regardless of spatial variations in potential food and the overlap in diet, typical of opportunistic species, body size appears as the key factor determining the role and position of krill in the food web Article in Journal/Newspaper Godthåbsfjord Greenland Meganyctiphanes norvegica Technical University of Denmark: DTU Orbit Marine Ecology Progress Series 516 139 151 |
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Open Polar |
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Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
description |
Four krill species with overlapping functional biology coexist in Greenland waters. Here, we used stable isotopes to investigate and discuss their trophic role and mode of coexistence. Bulk carbon (δ13C) and nitrogen (δ15N) stable isotope analyses of Thysanoessa longicaudata, T. inermis, T. raschii and Meganyctiphanes norvegica sampled in June 2010 in the Godthåbsfjord, SW Greenland revealed new insight into their trophic roles and positions. There was a general positive correlation between body length and trophic position. The largest species M. norvegica had the highest trophic position (TP = 2.8 ± 0.2) indicating carnivory, while T. inermis (TP = 2.4 ± 0.3) had a more omnivorous diet. In turn, T. longicaudata and T. raschii (TP = 2.2 ± 0.2) were herbivorous. Along the fjord, nutrient and plankton composition affected trophic position. Thysanoessa longicaudata was more omnivorous offshore than inshore where it had the same trophic position as the baseline primary consumer Calanus spp. Similarly, T. raschii and T. inermis had higher trophic positions in the mouth of the fjord compared to the inner fjord. Regardless of spatial variations in potential food and the overlap in diet, typical of opportunistic species, body size appears as the key factor determining the role and position of krill in the food web |
format |
Article in Journal/Newspaper |
author |
Agersted, Mette Dalgaard Bode, Antonio Nielsen, Torkel Gissel |
spellingShingle |
Agersted, Mette Dalgaard Bode, Antonio Nielsen, Torkel Gissel Trophic position of coexisting krill species: a stable isotope approach |
author_facet |
Agersted, Mette Dalgaard Bode, Antonio Nielsen, Torkel Gissel |
author_sort |
Agersted, Mette Dalgaard |
title |
Trophic position of coexisting krill species: a stable isotope approach |
title_short |
Trophic position of coexisting krill species: a stable isotope approach |
title_full |
Trophic position of coexisting krill species: a stable isotope approach |
title_fullStr |
Trophic position of coexisting krill species: a stable isotope approach |
title_full_unstemmed |
Trophic position of coexisting krill species: a stable isotope approach |
title_sort |
trophic position of coexisting krill species: a stable isotope approach |
publishDate |
2014 |
url |
https://orbit.dtu.dk/en/publications/6b1f88ee-43d6-4a2a-adee-5c2bf876aef8 https://doi.org/10.3354/meps11055 https://backend.orbit.dtu.dk/ws/files/103086207/Publishers_version.pdf |
genre |
Godthåbsfjord Greenland Meganyctiphanes norvegica |
genre_facet |
Godthåbsfjord Greenland Meganyctiphanes norvegica |
op_source |
Agersted , M D , Bode , A & Nielsen , T G 2014 , ' Trophic position of coexisting krill species: a stable isotope approach ' , Marine Ecology Progress Series , vol. 516 , pp. 139-151 . https://doi.org/10.3354/meps11055 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/264933 https://orbit.dtu.dk/en/publications/6b1f88ee-43d6-4a2a-adee-5c2bf876aef8 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps11055 |
container_title |
Marine Ecology Progress Series |
container_volume |
516 |
container_start_page |
139 |
op_container_end_page |
151 |
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1799480429994049536 |