Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone
Arctic peatlands represent a major global carbon store, but rapid warming poses a threat to their long-term stability. Testate amoebae are sensitive hydrological indicators that offer insight into Holocene environmental change in peatlands. However, in contrast to temperate peatlands, there have onl...
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ftqueensubelpubl:oai:pure.qub.ac.uk/portal:publications/8629edb4-86ac-4a69-a29d-12c87b054512 2024-01-28T10:03:40+01:00 Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone Taylor, Liam S. Swindles, Graeme T. Morris, Paul J. Gałka, Mariusz 2019-01 https://pure.qub.ac.uk/en/publications/8629edb4-86ac-4a69-a29d-12c87b054512 https://doi.org/10.1016/j.ecolind.2018.08.049 http://www.scopus.com/inward/record.url?scp=85052989060&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Taylor , L S , Swindles , G T , Morris , P J & Gałka , M 2019 , ' Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone ' , Ecological Indicators , vol. 96 , no. 1 , pp. 153-162 . https://doi.org/10.1016/j.ecolind.2018.08.049 Arctic Ecohydrology Ecology Palaeohydrology Transfer function Trophic gradient /dk/atira/pure/subjectarea/asjc/1800 Decision Sciences(all) /dk/atira/pure/subjectarea/asjc/1100/1105 Evolution Behavior and Systematics /dk/atira/pure/subjectarea/asjc/2300/2303 article 2019 ftqueensubelpubl https://doi.org/10.1016/j.ecolind.2018.08.049 2024-01-04T23:21:47Z Arctic peatlands represent a major global carbon store, but rapid warming poses a threat to their long-term stability. Testate amoebae are sensitive hydrological indicators that offer insight into Holocene environmental change in peatlands. However, in contrast to temperate peatlands, there have only been a few studies into the ecology of testate amoebae and their efficacy as environmental indicators in permafrost peatlands. We present the first study of testate amoeba ecology from peatlands in the continuous permafrost zone, based on samples from across the Alaskan North Slope. Multivariate statistical analyses show that pore water electrical conductivity (EC), a proxy for nutrient status along the ombrotrophic-minerotrophic gradient, is the dominant control on testate amoeba distribution. Water-table depth (WTD) is also a significant control on testate amoeba distribution, but is secondary to EC. We present two new testate amoeba-based transfer functions to reconstruct both EC (TF EC ) and WTD (TF WTD ), the first for peatlands in the continuous permafrost zone. The transfer functions are based on Weighted Averaging Partial Least Squares (WAPLS) regression and were assessed using leave-one-out (LOO) cross-validation. We find that both transfer functions have good predictive power. TF WTD is the best performing model (R 2 JACK = 0.84, RMSEP JACK = 6.66 cm), but TF EC also performs well (R 2 JACK = 0.76, RMSEP JACK = 146 μS cm −1 ). Our findings are similar to those conducted in peatlands in discontinuous permafrost regions. The new transfer functions open the opportunity for reconstructing the Holocene dynamics of peatlands of the continuous permafrost zone in Alaska, which represent rapidly changing ecosystems. Article in Journal/Newspaper Arctic north slope permafrost Alaska Queen's University Belfast Research Portal Arctic Ecological Indicators 96 153 162 |
institution |
Open Polar |
collection |
Queen's University Belfast Research Portal |
op_collection_id |
ftqueensubelpubl |
language |
English |
topic |
Arctic Ecohydrology Ecology Palaeohydrology Transfer function Trophic gradient /dk/atira/pure/subjectarea/asjc/1800 Decision Sciences(all) /dk/atira/pure/subjectarea/asjc/1100/1105 Evolution Behavior and Systematics /dk/atira/pure/subjectarea/asjc/2300/2303 |
spellingShingle |
Arctic Ecohydrology Ecology Palaeohydrology Transfer function Trophic gradient /dk/atira/pure/subjectarea/asjc/1800 Decision Sciences(all) /dk/atira/pure/subjectarea/asjc/1100/1105 Evolution Behavior and Systematics /dk/atira/pure/subjectarea/asjc/2300/2303 Taylor, Liam S. Swindles, Graeme T. Morris, Paul J. Gałka, Mariusz Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone |
topic_facet |
Arctic Ecohydrology Ecology Palaeohydrology Transfer function Trophic gradient /dk/atira/pure/subjectarea/asjc/1800 Decision Sciences(all) /dk/atira/pure/subjectarea/asjc/1100/1105 Evolution Behavior and Systematics /dk/atira/pure/subjectarea/asjc/2300/2303 |
description |
Arctic peatlands represent a major global carbon store, but rapid warming poses a threat to their long-term stability. Testate amoebae are sensitive hydrological indicators that offer insight into Holocene environmental change in peatlands. However, in contrast to temperate peatlands, there have only been a few studies into the ecology of testate amoebae and their efficacy as environmental indicators in permafrost peatlands. We present the first study of testate amoeba ecology from peatlands in the continuous permafrost zone, based on samples from across the Alaskan North Slope. Multivariate statistical analyses show that pore water electrical conductivity (EC), a proxy for nutrient status along the ombrotrophic-minerotrophic gradient, is the dominant control on testate amoeba distribution. Water-table depth (WTD) is also a significant control on testate amoeba distribution, but is secondary to EC. We present two new testate amoeba-based transfer functions to reconstruct both EC (TF EC ) and WTD (TF WTD ), the first for peatlands in the continuous permafrost zone. The transfer functions are based on Weighted Averaging Partial Least Squares (WAPLS) regression and were assessed using leave-one-out (LOO) cross-validation. We find that both transfer functions have good predictive power. TF WTD is the best performing model (R 2 JACK = 0.84, RMSEP JACK = 6.66 cm), but TF EC also performs well (R 2 JACK = 0.76, RMSEP JACK = 146 μS cm −1 ). Our findings are similar to those conducted in peatlands in discontinuous permafrost regions. The new transfer functions open the opportunity for reconstructing the Holocene dynamics of peatlands of the continuous permafrost zone in Alaska, which represent rapidly changing ecosystems. |
format |
Article in Journal/Newspaper |
author |
Taylor, Liam S. Swindles, Graeme T. Morris, Paul J. Gałka, Mariusz |
author_facet |
Taylor, Liam S. Swindles, Graeme T. Morris, Paul J. Gałka, Mariusz |
author_sort |
Taylor, Liam S. |
title |
Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone |
title_short |
Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone |
title_full |
Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone |
title_fullStr |
Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone |
title_full_unstemmed |
Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone |
title_sort |
ecology of peatland testate amoebae in the alaskan continuous permafrost zone |
publishDate |
2019 |
url |
https://pure.qub.ac.uk/en/publications/8629edb4-86ac-4a69-a29d-12c87b054512 https://doi.org/10.1016/j.ecolind.2018.08.049 http://www.scopus.com/inward/record.url?scp=85052989060&partnerID=8YFLogxK |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope permafrost Alaska |
genre_facet |
Arctic north slope permafrost Alaska |
op_source |
Taylor , L S , Swindles , G T , Morris , P J & Gałka , M 2019 , ' Ecology of peatland testate amoebae in the Alaskan continuous permafrost zone ' , Ecological Indicators , vol. 96 , no. 1 , pp. 153-162 . https://doi.org/10.1016/j.ecolind.2018.08.049 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.ecolind.2018.08.049 |
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Ecological Indicators |
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96 |
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153 |
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162 |
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1789329109053079552 |