Assessing ecological effects of glacial meltwater on lakes fed by the Greenland Ice Sheet: The role of nutrient subsidies and turbidity

Burpee, Benjamin T.; Anderson, Dennis S.; Saros, Jasmine E.

doi:10.1080/15230430.2017.1420953

Cited by 13 publications

(9 citation statements)

References 66 publications

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“…DOC contents in the moraine pond waters are similar to the range found in supraglacial streams and glacially fed lakes near the study area Burpee, Anderson, and Saros 2018) and in other ice lakes in the Kangerslussuaq area (Anderson and Stedmon 2007;Saros et al 2015;Northington and Saros 2016;Osburn et al 2017;Fowler, Saros, and Osburn 2018). Apparently, they are high enough to sustain aerobic microbiological (heterotrophic) activities .…”

Section: Doc and Toc Contentssupporting

confidence: 74%

Chemical weathering in a moraine at the ice sheet margin at Kangerlussuaq, western Greenland

Auqué

Puigdomènech

Tullborg³

et al. 2019

Arctic, Antarctic, and Alpine Research

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Weathering caused by interaction between glacial sediments and water in exposed moraines needs to be studied to evaluate their possible effects on the global carbon cycle. In this study, moraine ponds, moraine porewaters, and till samples were collected at a moraine adjacent to the Greenland Ice Sheet at Kangerlussuaq. Scanning electron microscopy (SEM) studies of the till show limited evidence of silicate chemical weathering, but the moraine waters have substantial solute concentrations. δ 34 S SO4 and δ 18 O SO4 data indicate that the origin of dissolved sulfate is the oxidation of sulfides, in agreement with the SEM observations. The dissolved HCO 3 − /SO 4 2− molar ratios indicate an uneven balance between sulfuric and carbonic acid weathering; C-isotope data indicate that some of the CO 2 originates from organic carbon mineralization. Ion-ion plots provide evidence of carbonate weathering and of the formation of secondary gypsum and calcite through evaporation and (or) cryoconcentration. The 87 Sr/ 86 Sr ratios in the waters correlate with the corresponding till samples, supporting the local origin of the dissolved strontium, which is higher in the waters than in the till due to the selective weathering of biotite. The data evidence a large degree of chemical weathering in moraines promoted by large rock-water ratios and by the hydraulic isolation created by the frozen till. The high P CO2 in the studied moraine waters indicates that they may represent a previously underestimated CO 2 source.

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Section: Doc and Toc Contentssupporting

confidence: 74%

Chemical weathering in a moraine at the ice sheet margin at Kangerlussuaq, western Greenland

Auqué

Puigdomènech

Tullborg³

et al. 2019

Arctic, Antarctic, and Alpine Research

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“…For example, diatoms have effectively tracked the effects of nutrient subsidies [9] and disruptions to thermal stratification [3] from increased glacial meltwater. To date, most research on the ecological effects of glacial meltwater on lakes has focused on alpine regions with only a few examples from the Arctic [10].…”

Section: Introductionmentioning

confidence: 99%

Contrasting the ecological effects of decreasing ice cover versus accelerated glacial melt on the High Arctic's largest lake

et al. 2020

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Lake Hazen, the High Arctic's largest lake, has received an approximately 10-fold increase in glacial meltwater since its catchment glaciers shifted from net mass gain to net mass loss in 2007 common era (CE), concurrent with recent warming. Increased glacial meltwater can alter the ecological functioning of recipient aquatic ecosystems via changes to nutrient budgets, turbidity and thermal regimes. Here, we examine a rare set of five high-resolution sediment cores collected in Lake Hazen between 1990 and 2017 CE to investigate the influence of increased glacial meltwater versus alterations to lake ice phenology on ecological change. Subfossil diatom assemblages in all cores show two major shifts over the past approximately 200 years including: (i) a proliferation of pioneering, benthic taxa at approximately 1900 CE from previously depauperate populations; and (ii) a rise in planktonic taxa beginning at approximately 1980 CE to present-day dominance. The topmost intervals from each sequentially collected core provide exact dates and demonstrate that diatom regime shifts occurred decades prior to accelerated glacial inputs. These data show that diatom assemblages in Lake Hazen are responding primarily to intrinsic lake factors linked to decreasing duration of lake ice and snow cover rather than to limnological impacts associated with increased glacial runoff.

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“…isotope niche widths) of primary consumers. This is probably because the seasonally increased turbidity limits light penetration and periphyton development in our streams (Burpee et al, 2018;Uehlinger et al, 2010), which is then further reflected in consumer δ 13 C and δ 15 N values.…”

Section: Seasonality In Basal Resource and Consumer Isotope Ratiosmentioning

confidence: 98%

Does rapid glacial recession affect feeding habits of alpine stream insects?

et al. 2020

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1. Glacial retreat, accompanied by shifts in riparian vegetation and glacier meltwater inputs, alters the energy supply and trophic structure of alpine stream food webs. Our goal in this study was to enhance understanding of dietary niches of macroinvertebrates inhabiting different alpine streams with contrasting glacial and nonglacial (groundwater, precipitation, snowmelt) water inputs in conjunction with seasonal and habitat-specific variation in basal resource availability. 2. We measured a range of stream physico-chemical attributes as well as carbon and nitrogen isotopes (δ 13 C, δ 15 N) of macroinvertebrates and primary food sources at seven sites across seasons within a Swiss glaciated catchment (Val Roseg) undergoing rapid glacial retreat (1-2 km between 1997 and 2014). Sampling sites corresponded to streams used in a previous (1997/1998) study within the same alpine catchment. 3. Physico-chemical attributes showed wide variation in environmental conditions across streams and seasons. Significant correlation among physico-chemical proxies of glacier meltwater (phosphate-P, total inorganic carbon, conductivity, turbidity) and macroinvertebrate δ 13 C, δ 15 N, and size-corrected standard ellipse area (a proxy for feeding niche width) values showed that the extent of glacial water input shapes the energy base among alpine streams. Feeding niche differences among common alpine stream insect taxa (Chironomidae, Baetidae, Heptageniidae) were not significant, indicating that these organisms probably are plastic in feeding behaviour, opportunistically relying on food resources available in a particular stream and season. 4. Seasonal trends in macroinvertebrate δ 13 C largely followed patterns in periphyton δ 13 C values, indicating that autochthonous resources were the main consumer energy source within the stream network, as shown previously. The overall range in macroinvertebrate δ 13 C (−33.5 to −18.4‰) and δ 15 N (−6.9 to 6.7‰) values also corresponded to values measured in the previous study, suggesting that macroinvertebrates altered diets in line with changes in environmental conditions and food resources during a period of rapid glacial retreat. Our results suggest that | 115 SERTIĆ PERIĆ ET al.

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Assessing ecological effects of glacial meltwater on lakes fed by the Greenland Ice Sheet: The role of nutrient subsidies and turbidity

Cited by 13 publications

References 66 publications

Chemical weathering in a moraine at the ice sheet margin at Kangerlussuaq, western Greenland

Chemical weathering in a moraine at the ice sheet margin at Kangerlussuaq, western Greenland

Contrasting the ecological effects of decreasing ice cover versus accelerated glacial melt on the High Arctic's largest lake

Does rapid glacial recession affect feeding habits of alpine stream insects?

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