Variation in summer nitrogen and phosphorus uptake among Siberian headwater streams

Schade, J. D.; Seybold, E. C.; Drake, Travis W.; Spawn, S.; Sobczak, William V.; Frey, Karen E.; Holmes, Robert M.; Zimov, N.

doi:10.3402/polar.v35.24571

Cited by 13 publications

(12 citation statements)

References 39 publications

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“…nutrient uptake between the remaining three streams was similar to findings from Siberia (Diemer et al 2015;Schade et al 2016) and Svalbard (Blaen et al 2014). NH 4 + uptake was lower than observed in Siberia, but comparable to the lower uptake results from Svalbard, whilst PO 4 3-and NO 3 − uptake were lower than other studies (Blaen et al 2014;Diemer et al 2015;Schade et al 2016).…”

Section: Nutrient Uptake Dynamicssupporting

confidence: 84%

“…NH 4 + uptake was lower than observed in Siberia, but comparable to the lower uptake results from Svalbard, whilst PO 4 3-and NO 3 − uptake were lower than other studies (Blaen et al 2014;Diemer et al 2015;Schade et al 2016). With low benthic algae biomass, and moss not evident, uptake of all nutrients in Palnatokeelv was unexpected.…”

Section: Nutrient Uptake Dynamicssupporting

confidence: 70%

“…The streams in this study displayed both N and P limitation, whilst streams in Svalbard and Siberia proved to be primarily N limited (Blaen et al 2014;Schade et al 2016). The reach-scale P limitation in Greenland seems to be primarily driven by heterotrophic uptake while the autotrophic biofilm production is mainly N limited.…”

Section: Summary and Implicationsmentioning

confidence: 58%

“…However, when NH 4 + uptake was evident, NH 4 + was in higher demand compared to availability than PO 4 3-, meaning that NH 4 + was the overall primary limiting nutrient in these systems, as found in Arctic Siberia and Svalbard (Blaen et al 2014;Schade et al 2016). In a study from boreal Siberia, both PO 4 3-and NH 4 + were found to be limiting in different streams (Diemer et al 2015).…”

Section: Nutrient Uptake Dynamicsmentioning

confidence: 91%

“…This input results in peak flow and peak nutrient concentration and bioavailability in the headwaters at that time of year (Holmes et al 2008;Mann et al 2012) and also the peak time for nutrient export to the ocean (Finlay et al 2006;Holmes et al 2008;Mann et al 2012). Despite the accelerated climate change experienced in high-latitude regions, the number of studies that have examined nutrient uptake in Arctic headwater streams is limited (but see Wollheim et al 2001;Blaen et al 2014;Diemer et al 2015;Schade et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Nutrient uptake controls and limitation dynamics in north-east Greenland streams

et al. 2018

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Permafrost thaw induced by climate change will cause increased release of nutrients and organic matter from the active layer to Arctic streams and, with increased water temperature, will potentially enhance algal biomass and nutrient uptake. Although essential for accurately predicting the response of Arctic streams to environmental change, knowledge of nutrient release on current Arctic in-stream processing is limited. Addressing this research gap, we quantified nutrient uptake of short-term releases of NO 3 − , PO 4 3-and NH 4 + during peak snowmelt season in five streams of contrasting physiochemical characteristics (from unstable, highly turbid to highly stable, clear-water systems) in north-east Greenland to elucidate the major controls driving nutrient dynamics. Releases were plus or minus acetate to evaluate uptake dynamics with and without a dissolved organic carbon source. To substantiate limiting nutrients to algal biomass, nutrient-diffusing substrates were installed in the five streams for 16 days with NH 4 + , PO 4 3-or NH 4 + + PO 4 3-on organic and inorganic substrates. Observed low uptake rates were due to a combination of low nutrient and DOC concentrations, combined with low water temperature and primary producer biomass, and substantial variation occurred between streams. N was found to be the primary limiting nutrient for biofilm, whilst streams displayed widespread PO 4 3-limitation. This research has important implications for future changes in nutrient processing and export in Arctic streams, which are predicted to include increased nutrient uptake rates due to increased nutrient availability, warmer water temperatures and increased concentration of labile carbon. These changes could have ecosystem and landscape-wide impacts.

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