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Deciphering the structure of the West Greenland marine food web using stable isotopes (δ13C, δ15N)

Linnebjerg, Jannie Fries LU ; Hobson, Keith A.; Fort, Jérôme; Nielsen, Torkel Gissel; Møller, Per; Wieland, Kai; Born, Erik W.; Rigét, Frank F. and Mosbech, Anders (2016) In Marine Biology 163(11).
Abstract

The Arctic is facing major environmental changes impacting marine biodiversity and ecosystem functioning. One way of assessing the responses of an ecosystem to these changes is to quantitatively study food web dynamics. Here, we used stable isotope (δ15N and δ13C) analyses of 39 Arctic marine species to investigate trophic relationships and isotopic niches of the West Greenland food web in 2000–2004. The lowest δ15N values were found for suspension feeding blue mussel (Mytilus edulis; 6.1 ‰) and the highest for polar bear (Ursus maritimus; 20.2 ‰). For δ13C, copepods (Calanus spp.) had the lowest values (−20.4 ‰) and snow crab (Chionoecetes opilio) the highest values (−15.8 ‰). Our results... (More)

The Arctic is facing major environmental changes impacting marine biodiversity and ecosystem functioning. One way of assessing the responses of an ecosystem to these changes is to quantitatively study food web dynamics. Here, we used stable isotope (δ15N and δ13C) analyses of 39 Arctic marine species to investigate trophic relationships and isotopic niches of the West Greenland food web in 2000–2004. The lowest δ15N values were found for suspension feeding blue mussel (Mytilus edulis; 6.1 ‰) and the highest for polar bear (Ursus maritimus; 20.2 ‰). For δ13C, copepods (Calanus spp.) had the lowest values (−20.4 ‰) and snow crab (Chionoecetes opilio) the highest values (−15.8 ‰). Our results show that the three trophic enrichment factor (TEF) approaches used to quantify species trophic positions (fixed TEF of 3.8 and 3.4 ‰ or scaled TEF) did not generally affect trophic modelling and provided similar conclusions. Overall, the findings in this study are in good agreement with previous investigations of other Arctic marine ecosystems. Interestingly, we found little overlap of core isotopic niches used by the four investigated functional groups (mammals, seabirds, fish and invertebrates), except for seabirds and fish where an overlap of 24 % was found. These results provide new insights into species and functional group interactions, as well as into the food web structure and ecosystem functioning of an important Arctic region that can be used as a template to guide future modelling of carbon, energy and contaminant flow in the region.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Marine Biology
volume
163
issue
11
publisher
Springer
external identifiers
  • scopus:84991490681
  • wos:000386768500009
ISSN
0025-3162
DOI
10.1007/s00227-016-3001-0
language
English
LU publication?
yes
id
ad14cd10-3be8-4188-a447-1df6eee6661f
date added to LUP
2016-10-31 08:37:08
date last changed
2017-09-24 05:02:27
@article{ad14cd10-3be8-4188-a447-1df6eee6661f,
  abstract     = {<p>The Arctic is facing major environmental changes impacting marine biodiversity and ecosystem functioning. One way of assessing the responses of an ecosystem to these changes is to quantitatively study food web dynamics. Here, we used stable isotope (δ<sup>15</sup>N and δ<sup>13</sup>C) analyses of 39 Arctic marine species to investigate trophic relationships and isotopic niches of the West Greenland food web in 2000–2004. The lowest δ<sup>15</sup>N values were found for suspension feeding blue mussel (Mytilus edulis; 6.1 ‰) and the highest for polar bear (Ursus maritimus; 20.2 ‰). For δ<sup>13</sup>C, copepods (Calanus spp.) had the lowest values (−20.4 ‰) and snow crab (Chionoecetes opilio) the highest values (−15.8 ‰). Our results show that the three trophic enrichment factor (TEF) approaches used to quantify species trophic positions (fixed TEF of 3.8 and 3.4 ‰ or scaled TEF) did not generally affect trophic modelling and provided similar conclusions. Overall, the findings in this study are in good agreement with previous investigations of other Arctic marine ecosystems. Interestingly, we found little overlap of core isotopic niches used by the four investigated functional groups (mammals, seabirds, fish and invertebrates), except for seabirds and fish where an overlap of 24 % was found. These results provide new insights into species and functional group interactions, as well as into the food web structure and ecosystem functioning of an important Arctic region that can be used as a template to guide future modelling of carbon, energy and contaminant flow in the region.</p>},
  articleno    = {230},
  author       = {Linnebjerg, Jannie Fries and Hobson, Keith A. and Fort, Jérôme and Nielsen, Torkel Gissel and Møller, Per and Wieland, Kai and Born, Erik W. and Rigét, Frank F. and Mosbech, Anders},
  issn         = {0025-3162},
  language     = {eng},
  month        = {11},
  number       = {11},
  publisher    = {Springer},
  series       = {Marine Biology},
  title        = {Deciphering the structure of the West Greenland marine food web using stable isotopes (δ<sup>13</sup>C, δ<sup>15</sup>N)},
  url          = {http://dx.doi.org/10.1007/s00227-016-3001-0},
  volume       = {163},
  year         = {2016},
}