Nutrients influence seasonal metabolic patterns and total productivity of Arctic streams

Myrstener, Maria; Gómez‐Gener, Lluís; Rocher-Ros, Gerard; Giesler, Reiner; Sponseller, Ryan A.

doi:10.1002/lno.11614

Cited by 20 publications

(41 citation statements)

References 76 publications

(118 reference statements)

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“…Specifically, colder environments typically have lower species richness and evenness. In our study, the more extreme tundra environments have warmer summer water temperatures than the less extreme forested sites (Lindberg 2017;Hauptmann 2019;Myrstener et al 2020). This pattern is characteristic of variations in the source water and shading among stream branches (Mellor et al 2017;Hauptmann 2019;Myrstener et al 2020).…”

Section: Discussionsupporting

confidence: 47%

“…The collections were taken at long-term monitoring sites established for other research projects and are thought to best represent the complete range of habitat variations present in the catchment (Myrstener et al 2020; Figure 2). Co-location with long-term monitoring sites is consistent with European best practices for diatom collection as this increases the potential for the collections to enrich other studies, and facilitation future collection to evaluate change over time (Kelly et al 1998).…”

Section: Diatom Collection and Preparationmentioning

confidence: 99%

“…While light is mechanistically linked to photosynthetic potential, previous studies report that variation in light availability among the forested and tundra sites is not sufficient to explain patterns in benthic biofilm biomass or metabolic activity in this region (Myrstener et al 2018). We obtained discharge and flood frequency measurements for our sites from Myrstener et al (2020). These measurements are based on high-frequency water depth measurements calibrated to discharge using the salt slug technique (Table 1).…”

Section: Water Chemistry and Other Measurementsmentioning

confidence: 99%

“…These measurements are based on high-frequency water depth measurements calibrated to discharge using the salt slug technique (Table 1). Finally, we calculated gross primary production rates for these sites based on a subset of the data reported by Myrstener et al (2020). These measurements were made in 2018 using the diel oxygen technique and are the average of 6-14 days in the week before and after our sampling period (inclusive).…”

Section: Water Chemistry and Other Measurementsmentioning

confidence: 99%

“…These is little inter-annual variation of site-specific patterns of primary production (Myrstener et al 2020).…”

Section: Water Chemistry and Other Measurementsmentioning

confidence: 99%

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Stream diatom assemblages in an Arctic catchment: diversity and relationship to ecosystem-scale primary production

Riley

Seekell

2021

Arctic Science

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We quantified benthic diatom diversity in streams in the Miellajokka catchment, about 200 km north of the Arctic circle in Sweden. Beta diversity among sites was related to local-scale environmental heterogeneity (occurring on the order of 1 km or less), and its magnitude was equal (Sørensen Index = 0.62) to levels previously reported for rivers on regional environmental gradients across 100’s of kilometers of Arctic Fennoscandia. Species turnover was the dominant (77%) component of beta diversity in the Miellajokka catchment. Small, stress-tolerant taxa dominated the assemblages, and there were no clear patterns of functional class among sites. Site ordinates from non-metric dimensional scaling were most strongly correlated with flood frequency (r = 0.83) and water temperature (r = 0.89), which was higher in harsh tundra sites than below treeline. Additionally, site ordinates were correlated (r = 0.83) with ecosystem-scale gross primary production – indicative of a link between diatom diversity and ecosystem function. Our results advance understanding of patterns diatom diversity in Arctic streams by quantifying local-scale variation that is understudied in this region, and by identifying the consequences of this local-scale diversity for an ecosystem-scale process.

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Section: Discussionsupporting

confidence: 47%

Section: Diatom Collection and Preparationmentioning

confidence: 99%

Section: Water Chemistry and Other Measurementsmentioning

confidence: 99%

Section: Water Chemistry and Other Measurementsmentioning

confidence: 99%

“…These is little inter-annual variation of site-specific patterns of primary production (Myrstener et al 2020).…”

Section: Water Chemistry and Other Measurementsmentioning

confidence: 99%

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Stream diatom assemblages in an Arctic catchment: diversity and relationship to ecosystem-scale primary production

Riley

Seekell

2021

Arctic Science

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Geomorphology and vegetation drive hydrochemistry changes in two Northeast Greenland streams

Pastor

Skovsholt

Christoffersen

et al. 2021

Hydrological Processes

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Climate change is causing drastic landscape changes in the Arctic, but how these changes modify stream biogeochemistry is not clear yet. We examined how catchment properties influence stream nitrogen (N) and dissolved organic carbon concentrations (DOC) in a high-Arctic environment. We sampled two contrasting headwater streams (10-15 stations over 4.8 and 6.8 km, respectively) in Northeast Greenland (74 N). We characterized the geomorphology (i.e., bedrock, solifluction and alluvial types) and the vegetation (i.e., barren, fell field, grassland and tundra types) cover of each subcatchment area draining into each sampling station and collected water samples for hydrochemistry characterization. The two sampled streams differed in geomorphology and vegetation cover in the catchment. Aucellaelv catchment was mostly covered by a 'bedrock' geomorphology (71%) and 'fellfield' vegetation (51%), whereas Kaeerelv was mostly covered by 'alluvial' geomorphology (65%) and 'grassland' and 'tundra' vegetation (42% and 41% respectively). Hydrochemistry also differed between the two study streams, with higher concentrations of inorganic N forms in Aucellaelv and lower DOC concentrations, compared to Kaerelv. The results from the linear mixed model selection showed that vegetation and geomorphology had contrasting effects on stream hydrochemistry. Subcatchments with higher solifluction sheets and limited vegetation had higher nitrate concentrations but lower DOC concentrations. Interestingly, we also found high variability on the production and removal of nitrate across subcatchments. These results indicate landscape controls to nutrient and organic matter exports via flow paths, soil organic matter stocks and nutrient retention via terrestrial vegetation. Moreover, the results suggest that climate change induced alterations to vegetation cover and soil physical disturbance in high-Arctic catchments will affect stream hydrochemistry, with potential effects in stream productivity, trophic relations as well as change of solute export to downstream coastal areas.

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Element cycling and aquatic function in a changing Arctic

Hernes

Tank

Sejr

et al. 2021

Limnology & Oceanography

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Arctic systems are under intense pressure from anthropogenic activities, with climate change in particular inducing rapid change in the interlinked cycling of water and various biogeochemical constituents, and thus also the ecological processes that depend on these cycles. This special issue for Limnology and Oceanography explores our changing Arctic, with contributions across the watershed‐lake‐river‐estuary‐coastal‐open ocean continuum, and foci ranging from physical and chemical processes to food webs. Some specific areas of focus include legacy pollution from mines, greenhouse gas emissions from lakes, riverine fluxes of materials, as well as the balance between primary production and respiration in the water column and benthos in marine systems. While varied in focus, as a collection the papers in this special issue do provide direction into key avenues for future effort. For example, while Arctic systems are historically understudied due to financial and logistical costs, long‐term monitoring efforts are clearly critical for documenting change, despite the challenges. In freshwater systems, predicting biogeochemistry, and thus ecology, based on landscape characteristics and lake morphology is an ongoing practice that seems particularly promising for both upscaling and decisions on focusing future research effort. In marine and coastal systems, complementing specific local studies with large‐scale cross‐disciplinary monitoring programs is clearly required for elucidating long‐term trends. While baseline research is critical for documenting the Arctic as it currently stands, and constitutes the majority of current research efforts, ongoing support for long‐term observatories and expanding remote sensing capabilities is a fundamental requirement for tracking change.

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Nutrients influence seasonal metabolic patterns and total productivity of Arctic streams

Cited by 20 publications

References 76 publications

Stream diatom assemblages in an Arctic catchment: diversity and relationship to ecosystem-scale primary production

Stream diatom assemblages in an Arctic catchment: diversity and relationship to ecosystem-scale primary production

Geomorphology and vegetation drive hydrochemistry changes in two Northeast Greenland streams

Element cycling and aquatic function in a changing Arctic

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