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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ftdoajarticles:oai:doaj.org/article:41443c4572a4423e96a18e0cd5829924 2023-05-15T15:18:04+02:00 Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model Torstein Pedersen 2022-03-01T00:00:00Z https://doi.org/10.3389/fmars.2022.813977 https://doaj.org/article/41443c4572a4423e96a18e0cd5829924 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.813977/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.813977 https://doaj.org/article/41443c4572a4423e96a18e0cd5829924 Frontiers in Marine Science, Vol 9 (2022) ecosystem structure trophic enrichment factor Arctic ecosystem ecosystem comparison polar bear food web Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2022 ftdoajarticles https://doi.org/10.3389/fmars.2022.813977 2022-12-31T02:28:28Z 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 mass-balance 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 (δ15N 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 δ15N 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 (TPSIR) 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 δ15N values assuming a baseline value for δ15N calculated for pelagic particulate organic matter at a baseline TP of 1.0. The estimated TEF of 3.0‰ was lower than the most commonly used TEF of 3.4 and 3.8‰ 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 δ15N values using a linear model compared better to the Ecopath model than the TPs from scaled ... Article in Journal/Newspaper Arctic Barents Sea Directory of Open Access Journals: DOAJ Articles Arctic Barents Sea Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ecosystem structure trophic enrichment factor Arctic ecosystem ecosystem comparison polar bear food web Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
ecosystem structure trophic enrichment factor Arctic ecosystem ecosystem comparison polar bear food web Science Q General. Including nature conservation geographical distribution QH1-199.5 Torstein Pedersen Comparison Between Trophic Positions in the Barents Sea Estimated From Stable Isotope Data and a Mass Balance Model |
topic_facet |
ecosystem structure trophic enrichment factor Arctic ecosystem ecosystem comparison polar bear food web Science Q General. Including nature conservation geographical distribution QH1-199.5 |
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 mass-balance 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 (δ15N 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 δ15N 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 (TPSIR) 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 δ15N values assuming a baseline value for δ15N calculated for pelagic particulate organic matter at a baseline TP of 1.0. The estimated TEF of 3.0‰ was lower than the most commonly used TEF of 3.4 and 3.8‰ 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 δ15N values using a linear model compared better to the Ecopath model than the TPs from scaled ... |
format |
Article in Journal/Newspaper |
author |
Torstein Pedersen |
author_facet |
Torstein Pedersen |
author_sort |
Torstein Pedersen |
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 S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.813977 https://doaj.org/article/41443c4572a4423e96a18e0cd5829924 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea |
genre_facet |
Arctic Barents Sea |
op_source |
Frontiers in Marine Science, Vol 9 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.813977/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.813977 https://doaj.org/article/41443c4572a4423e96a18e0cd5829924 |
op_doi |
https://doi.org/10.3389/fmars.2022.813977 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1766348299698176000 |