Identifying the influence of terrestrial–aquatic connectivity on palaeoecological inferences of past climate in Arctic lakes

Alannah M. Niemeyer; Andrew S. Medeiros; Anthony Todd; Brent B. Wolfe

doi:10.1111/bor.12572

Identifying the influence of terrestrial–aquatic connectivity on palaeoecological inferences of past climate in Arctic lakes

Alannah M. Niemeyer, Andrew S. Medeiros, Anthony Todd, Brent B. Wolfe

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Résumé

Increased hydrological connectivity due to permafrost degradation is likely to have substantial implications for shallow aquatic systems common to sub-arctic landscapes due to changes to overland and subsurface flow of water and transport of sediments and dissolved nutrients. Here, we explore the influence of increased connectivity on aquatic productivity based on multi-parameter palaeolimnological analysis of two lakes located near Inuvik (Northwest Territories, Canada). We contrast a lake with little evidence of permafrost degradation in the surrounding area (Lake PG03) to one that has multiple connections to the terrestrial landscape through a network of thaw polygons in the lake catchment (Lake PG09). Comparisons of biological indicators (chironomids) and organic carbon and nitrogen elemental and isotope composition reveal recent divergent lake histories. The chironomid assemblage of Lake PG03 followed an expected temperature gradient, with a warming signal evident since ˜1970 CE, whereas the chironomid assemblage of Lake PG09 was found to primarily respond to nutrient availability and changes in habitat, likely as a result of increasing hydrological connectivity to the landscape. Rapid assemblage and habitat change along with a prominent increase in chironomid abundance were observed at Lake PG09 after ˜1960 CE, following a shift to greater inputs from the terrestrial environment as indicated by high C:N ratios (>15) and low δ¹³C_org (−30‰). Increased aquatic productivity following high allochthonous additions (˜1960–2014 CE) is supported by decreased C:N and rapidly increasing organic matter (C_org, N). These results demonstrate that increased connectivity along the terrestrial–aquatic interface for lakes is likely to foster elevated productivity in the future. Likewise, increased production poses a challenge to chironomid-inferred July air temperature reconstructions in lakes that are less resilient to secondary gradients, where analogue mismatches can occur due to shifts in dominance of indicators that are orthogonal to the temperature gradient.

Langue d'origine	English
Pages (de-à)	451-464
Nombre de pages	14
Journal	Boreas
Volume	51
Numéro de publication	2
DOI	https://doi.org/10.1111/bor.12572
Statut de publication	Published - avr. 2022

Note bibliographique

Funding Information:
Funding for this project was provided by the Polar Continental Shelf Project, the W. Garfield Weston Foundation, and the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery awarded to BBW). Additional student support was provided by Wilfrid Laurier University (AT) Dalhousie University (AMN). Radiometric analysis and assistance with interpretation was provided by Johan Wiklund. Logistical support was provided by the Aurora Research Institute. We are thankful to Connor Nishikawa, Alexandria Soontiens‐Olsen, and Kathleen Hipwell for their laboratory assistance. We are grateful to Suzanne Tank and Cait Carew for fieldwork support. We also thank Dr Maarten van Hardenbroek, as well as the two anonymous reviewers and editor for insight and comments on drafts of this manuscript. This research was conducted with a scientific research permit (#15403) granted by the Aurora Research Institute, as well as permission from the Inuvialuit Settlement Region. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Funding Information:
Funding for this project was provided by the Polar Continental Shelf Project, the W. Garfield Weston Foundation, and the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery awarded to BBW). Additional student support was provided by Wilfrid Laurier University (AT) Dalhousie University (AMN). Radiometric analysis and assistance with interpretation was provided by Johan Wiklund. Logistical support was provided by the Aurora Research Institute. We are thankful to Connor Nishikawa, Alexandria Soontiens-Olsen, and Kathleen Hipwell for their laboratory assistance. We are grateful to Suzanne Tank and Cait Carew for fieldwork support. We also thank Dr Maarten van Hardenbroek, as well as the two anonymous reviewers and editor for insight and comments on drafts of this manuscript. This research was conducted with a scientific research permit (#15403) granted by the Aurora Research Institute, as well as permission from the Inuvialuit Settlement Region. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Publisher Copyright:
© 2021 The Authors. Boreas published by John Wiley & Sons Ltd on behalf of The Boreas Collegium.

ASJC Scopus Subject Areas

Ecology, Evolution, Behavior and Systematics
Archaeology
Geology

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10.1111/bor.12572

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title = "Identifying the influence of terrestrial–aquatic connectivity on palaeoecological inferences of past climate in Arctic lakes",

abstract = "Increased hydrological connectivity due to permafrost degradation is likely to have substantial implications for shallow aquatic systems common to sub-arctic landscapes due to changes to overland and subsurface flow of water and transport of sediments and dissolved nutrients. Here, we explore the influence of increased connectivity on aquatic productivity based on multi-parameter palaeolimnological analysis of two lakes located near Inuvik (Northwest Territories, Canada). We contrast a lake with little evidence of permafrost degradation in the surrounding area (Lake PG03) to one that has multiple connections to the terrestrial landscape through a network of thaw polygons in the lake catchment (Lake PG09). Comparisons of biological indicators (chironomids) and organic carbon and nitrogen elemental and isotope composition reveal recent divergent lake histories. The chironomid assemblage of Lake PG03 followed an expected temperature gradient, with a warming signal evident since ˜1970 CE, whereas the chironomid assemblage of Lake PG09 was found to primarily respond to nutrient availability and changes in habitat, likely as a result of increasing hydrological connectivity to the landscape. Rapid assemblage and habitat change along with a prominent increase in chironomid abundance were observed at Lake PG09 after ˜1960 CE, following a shift to greater inputs from the terrestrial environment as indicated by high C:N ratios (>15) and low δ13Corg (−30‰). Increased aquatic productivity following high allochthonous additions (˜1960–2014 CE) is supported by decreased C:N and rapidly increasing organic matter (Corg, N). These results demonstrate that increased connectivity along the terrestrial–aquatic interface for lakes is likely to foster elevated productivity in the future. Likewise, increased production poses a challenge to chironomid-inferred July air temperature reconstructions in lakes that are less resilient to secondary gradients, where analogue mismatches can occur due to shifts in dominance of indicators that are orthogonal to the temperature gradient.",

author = "Niemeyer, {Alannah M.} and Medeiros, {Andrew S.} and Anthony Todd and Wolfe, {Brent B.}",

note = "Funding Information: Funding for this project was provided by the Polar Continental Shelf Project, the W. Garfield Weston Foundation, and the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery awarded to BBW). Additional student support was provided by Wilfrid Laurier University (AT) Dalhousie University (AMN). Radiometric analysis and assistance with interpretation was provided by Johan Wiklund. Logistical support was provided by the Aurora Research Institute. We are thankful to Connor Nishikawa, Alexandria Soontiens‐Olsen, and Kathleen Hipwell for their laboratory assistance. We are grateful to Suzanne Tank and Cait Carew for fieldwork support. We also thank Dr Maarten van Hardenbroek, as well as the two anonymous reviewers and editor for insight and comments on drafts of this manuscript. This research was conducted with a scientific research permit (#15403) granted by the Aurora Research Institute, as well as permission from the Inuvialuit Settlement Region. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Funding Information: Funding for this project was provided by the Polar Continental Shelf Project, the W. Garfield Weston Foundation, and the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery awarded to BBW). Additional student support was provided by Wilfrid Laurier University (AT) Dalhousie University (AMN). Radiometric analysis and assistance with interpretation was provided by Johan Wiklund. Logistical support was provided by the Aurora Research Institute. We are thankful to Connor Nishikawa, Alexandria Soontiens-Olsen, and Kathleen Hipwell for their laboratory assistance. We are grateful to Suzanne Tank and Cait Carew for fieldwork support. We also thank Dr Maarten van Hardenbroek, as well as the two anonymous reviewers and editor for insight and comments on drafts of this manuscript. This research was conducted with a scientific research permit (#15403) granted by the Aurora Research Institute, as well as permission from the Inuvialuit Settlement Region. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Publisher Copyright: {\textcopyright} 2021 The Authors. Boreas published by John Wiley & Sons Ltd on behalf of The Boreas Collegium.",

year = "2022",

month = apr,

doi = "10.1111/bor.12572",

language = "English",

volume = "51",

pages = "451--464",

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T1 - Identifying the influence of terrestrial–aquatic connectivity on palaeoecological inferences of past climate in Arctic lakes

AU - Niemeyer, Alannah M.

AU - Medeiros, Andrew S.

AU - Todd, Anthony

AU - Wolfe, Brent B.

N1 - Funding Information: Funding for this project was provided by the Polar Continental Shelf Project, the W. Garfield Weston Foundation, and the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery awarded to BBW). Additional student support was provided by Wilfrid Laurier University (AT) Dalhousie University (AMN). Radiometric analysis and assistance with interpretation was provided by Johan Wiklund. Logistical support was provided by the Aurora Research Institute. We are thankful to Connor Nishikawa, Alexandria Soontiens‐Olsen, and Kathleen Hipwell for their laboratory assistance. We are grateful to Suzanne Tank and Cait Carew for fieldwork support. We also thank Dr Maarten van Hardenbroek, as well as the two anonymous reviewers and editor for insight and comments on drafts of this manuscript. This research was conducted with a scientific research permit (#15403) granted by the Aurora Research Institute, as well as permission from the Inuvialuit Settlement Region. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Funding Information: Funding for this project was provided by the Polar Continental Shelf Project, the W. Garfield Weston Foundation, and the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery awarded to BBW). Additional student support was provided by Wilfrid Laurier University (AT) Dalhousie University (AMN). Radiometric analysis and assistance with interpretation was provided by Johan Wiklund. Logistical support was provided by the Aurora Research Institute. We are thankful to Connor Nishikawa, Alexandria Soontiens-Olsen, and Kathleen Hipwell for their laboratory assistance. We are grateful to Suzanne Tank and Cait Carew for fieldwork support. We also thank Dr Maarten van Hardenbroek, as well as the two anonymous reviewers and editor for insight and comments on drafts of this manuscript. This research was conducted with a scientific research permit (#15403) granted by the Aurora Research Institute, as well as permission from the Inuvialuit Settlement Region. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Publisher Copyright: © 2021 The Authors. Boreas published by John Wiley & Sons Ltd on behalf of The Boreas Collegium.

PY - 2022/4

Y1 - 2022/4

N2 - Increased hydrological connectivity due to permafrost degradation is likely to have substantial implications for shallow aquatic systems common to sub-arctic landscapes due to changes to overland and subsurface flow of water and transport of sediments and dissolved nutrients. Here, we explore the influence of increased connectivity on aquatic productivity based on multi-parameter palaeolimnological analysis of two lakes located near Inuvik (Northwest Territories, Canada). We contrast a lake with little evidence of permafrost degradation in the surrounding area (Lake PG03) to one that has multiple connections to the terrestrial landscape through a network of thaw polygons in the lake catchment (Lake PG09). Comparisons of biological indicators (chironomids) and organic carbon and nitrogen elemental and isotope composition reveal recent divergent lake histories. The chironomid assemblage of Lake PG03 followed an expected temperature gradient, with a warming signal evident since ˜1970 CE, whereas the chironomid assemblage of Lake PG09 was found to primarily respond to nutrient availability and changes in habitat, likely as a result of increasing hydrological connectivity to the landscape. Rapid assemblage and habitat change along with a prominent increase in chironomid abundance were observed at Lake PG09 after ˜1960 CE, following a shift to greater inputs from the terrestrial environment as indicated by high C:N ratios (>15) and low δ13Corg (−30‰). Increased aquatic productivity following high allochthonous additions (˜1960–2014 CE) is supported by decreased C:N and rapidly increasing organic matter (Corg, N). These results demonstrate that increased connectivity along the terrestrial–aquatic interface for lakes is likely to foster elevated productivity in the future. Likewise, increased production poses a challenge to chironomid-inferred July air temperature reconstructions in lakes that are less resilient to secondary gradients, where analogue mismatches can occur due to shifts in dominance of indicators that are orthogonal to the temperature gradient.

AB - Increased hydrological connectivity due to permafrost degradation is likely to have substantial implications for shallow aquatic systems common to sub-arctic landscapes due to changes to overland and subsurface flow of water and transport of sediments and dissolved nutrients. Here, we explore the influence of increased connectivity on aquatic productivity based on multi-parameter palaeolimnological analysis of two lakes located near Inuvik (Northwest Territories, Canada). We contrast a lake with little evidence of permafrost degradation in the surrounding area (Lake PG03) to one that has multiple connections to the terrestrial landscape through a network of thaw polygons in the lake catchment (Lake PG09). Comparisons of biological indicators (chironomids) and organic carbon and nitrogen elemental and isotope composition reveal recent divergent lake histories. The chironomid assemblage of Lake PG03 followed an expected temperature gradient, with a warming signal evident since ˜1970 CE, whereas the chironomid assemblage of Lake PG09 was found to primarily respond to nutrient availability and changes in habitat, likely as a result of increasing hydrological connectivity to the landscape. Rapid assemblage and habitat change along with a prominent increase in chironomid abundance were observed at Lake PG09 after ˜1960 CE, following a shift to greater inputs from the terrestrial environment as indicated by high C:N ratios (>15) and low δ13Corg (−30‰). Increased aquatic productivity following high allochthonous additions (˜1960–2014 CE) is supported by decreased C:N and rapidly increasing organic matter (Corg, N). These results demonstrate that increased connectivity along the terrestrial–aquatic interface for lakes is likely to foster elevated productivity in the future. Likewise, increased production poses a challenge to chironomid-inferred July air temperature reconstructions in lakes that are less resilient to secondary gradients, where analogue mismatches can occur due to shifts in dominance of indicators that are orthogonal to the temperature gradient.

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Identifying the influence of terrestrial–aquatic connectivity on palaeoecological inferences of past climate in Arctic lakes

Résumé

Note bibliographique

ASJC Scopus Subject Areas

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