Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model
The trophic position concept is central in system ecology, and in this study, trophic position (TP) estimates from stable-isotopes and an Ecopath mass-balance food web model for the Barents Sea were compared. Two alternative models for estimating TP from stable isotopes, with fixed or scaled trophic...
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Online Access: | https://hdl.handle.net/10037/26634 https://doi.org/10.3389/fmars.2022.813977 |
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ftunivtroemsoe:oai:munin.uit.no:10037/26634 2023-05-15T15:38:42+02:00 Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model Pedersen, Torstein 2022-03-04 https://hdl.handle.net/10037/26634 https://doi.org/10.3389/fmars.2022.813977 eng eng Frontiers Media Frontiers in Marine Science Pedersen. Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model. Frontiers in Marine Science. 2022;9 FRIDAID 2025736 doi:10.3389/fmars.2022.813977 2296-7745 https://hdl.handle.net/10037/26634 openAccess Copyright 2022 The Author(s) Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2022 ftunivtroemsoe https://doi.org/10.3389/fmars.2022.813977 2022-09-07T23:00:13Z The trophic position concept is central in system ecology, and in this study, trophic position (TP) estimates from stable-isotopes and an Ecopath mass-balance food web model for the Barents Sea were compared. Two alternative models for estimating TP from stable isotopes, with fixed or scaled trophic fractionation were applied. The massbalance model was parametrized and balanced for year 2000, was comprised of 108 functional groups (Gs), and was based on biomass and diet data largely based on predator stomach data. Literature search for the Barents Sea Large Marine Ecosystem revealed 93 sources with stable isotope data (δ 15 N values) for 83 FGs, and 25 of the publications had trophic position estimated from nitrogen stable isotopes. Trophic positions estimated from the mass-balance model ranged to 5.1 TP and were highly correlated with group mean δ 15 N values, and also highly correlated with the original literature estimates of trophic positions from stable isotopes. On average, TP from the mass-balance model was 0.1 TP higher than the original literature TP estimates (TP SIR ) from stable isotopes. A trophic enrichment factor (TEF) was estimated assuming fixed fractionation and minimizing differences between trophic positions from Ecopath and TP predicted from δ 15 N values assuming a baseline value for δ 15 N calculated for pelagic particulate organic matter at a baseline TP of 1.0. The estimated TEF of 3.0h was lower than the most commonly used TEF of 3.4 and 3.8h in the literature. The pelagic whales and pelagic invertebrates functional groups tended to have higher trophic positions from Ecopath than from stable isotopes while benthic invertebrate functional groups tended to show an opposite pattern. Trophic positions calculated using the scaled trophic fractionation approach resulted in lower TP than from Ecopath for intermediate TPs and also a larger TP range in the BS. It is concluded that TPs estimated from δ 15 N values using a linear model compared better to the Ecopath model than the TPs from scaled ... Article in Journal/Newspaper Barents Sea University of Tromsø: Munin Open Research Archive Barents Sea Frontiers in Marine Science 9 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
language |
English |
description |
The trophic position concept is central in system ecology, and in this study, trophic position (TP) estimates from stable-isotopes and an Ecopath mass-balance food web model for the Barents Sea were compared. Two alternative models for estimating TP from stable isotopes, with fixed or scaled trophic fractionation were applied. The massbalance model was parametrized and balanced for year 2000, was comprised of 108 functional groups (Gs), and was based on biomass and diet data largely based on predator stomach data. Literature search for the Barents Sea Large Marine Ecosystem revealed 93 sources with stable isotope data (δ 15 N values) for 83 FGs, and 25 of the publications had trophic position estimated from nitrogen stable isotopes. Trophic positions estimated from the mass-balance model ranged to 5.1 TP and were highly correlated with group mean δ 15 N values, and also highly correlated with the original literature estimates of trophic positions from stable isotopes. On average, TP from the mass-balance model was 0.1 TP higher than the original literature TP estimates (TP SIR ) from stable isotopes. A trophic enrichment factor (TEF) was estimated assuming fixed fractionation and minimizing differences between trophic positions from Ecopath and TP predicted from δ 15 N values assuming a baseline value for δ 15 N calculated for pelagic particulate organic matter at a baseline TP of 1.0. The estimated TEF of 3.0h was lower than the most commonly used TEF of 3.4 and 3.8h in the literature. The pelagic whales and pelagic invertebrates functional groups tended to have higher trophic positions from Ecopath than from stable isotopes while benthic invertebrate functional groups tended to show an opposite pattern. Trophic positions calculated using the scaled trophic fractionation approach resulted in lower TP than from Ecopath for intermediate TPs and also a larger TP range in the BS. It is concluded that TPs estimated from δ 15 N values using a linear model compared better to the Ecopath model than the TPs from scaled ... |
format |
Article in Journal/Newspaper |
author |
Pedersen, Torstein |
spellingShingle |
Pedersen, Torstein Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model |
author_facet |
Pedersen, Torstein |
author_sort |
Pedersen, Torstein |
title |
Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model |
title_short |
Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model |
title_full |
Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model |
title_fullStr |
Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model |
title_full_unstemmed |
Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model |
title_sort |
comparison between trophic positions in the barents sea estimated from stable isotope data and a mass balance model |
publisher |
Frontiers Media |
publishDate |
2022 |
url |
https://hdl.handle.net/10037/26634 https://doi.org/10.3389/fmars.2022.813977 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_relation |
Frontiers in Marine Science Pedersen. Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model. Frontiers in Marine Science. 2022;9 FRIDAID 2025736 doi:10.3389/fmars.2022.813977 2296-7745 https://hdl.handle.net/10037/26634 |
op_rights |
openAccess Copyright 2022 The Author(s) |
op_doi |
https://doi.org/10.3389/fmars.2022.813977 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
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1766369946368999424 |