Consequences of anthropogenic activity for two remote alpine lakes in NW Slovenia as tracked by sediment geochemistry

Muri, Gregor; Čermelj, Branko; Jačimović, Radojko; Skaberne, Dragomir; Šmuc, Andrej; Šturm, Martina Burnik; Turšič, Janja; Vreča, Polona

doi:10.1007/s10933-013-9738-2

Cited by 17 publications

(17 citation statements)

References 34 publications

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“…1). Detailed descriptions of the lake can be found elsewhere (Brancelj 2002;Muri et al 2013Muri et al , 2018. Briefly, the lake is situated just below the local tree line at an altitude of 1669 m, is relatively small (0.66 ha) and shallow (z max \ 10 m), has no permanent surface tributaries, but is fed by an underground spring.…”

Section: Site Descriptionmentioning

confidence: 99%

“…The joined-lake system is known as Dvojno jezero ('Double Lake'). Because the upper 15 cm of sediment in 5J is a slump or turbidite (Muri et al 2013), 5J cannot be used for paleoenvironmental reconstructions.…”

Section: Site Descriptionmentioning

confidence: 99%

“…A frequently visited mountain hut on the shore of 5J may also contribute nutrients to the lake in the form of wastewater inflow. Whereas the introduction of fish has had a documented major impact on lake condition (Ravnikar et al 2016), the impact of the hut remains unclear (Muri et al 2013(Muri et al , 2018.…”

Section: Site Descriptionmentioning

confidence: 99%

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Recent changes in major and trace elements in sediments from a remote mountain lake (6th Triglav Lake) in the Julian Alps, NW Slovenia

et al. 2020

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We collected a sediment core from the 6th (6J) Triglav Lake, a remote mountain lake in NW Slovenia, and analysed it for 25 elements, using k 0instrumental neutron activation analysis (k 0 -INAA). For Hg, we used cold vapour atomic absorption spectrometry (CVAAS). Data were analysed using Principal Component Analysis (PCA). PCA indicated several distinct groups of elements and sediment core samples. Ca distribution was entirely different from all other sediment components. Ba, Br, Hg, Sb and Zn were associated with organic matter (OM), with Hg showing the strongest affinity to OM. As, Cr, Fe and U formed a group of redox-sensitive elements. Two events that occurred ca. 1915 and in the 1940s/1950s, were identified in the core. They were associated with increased inputs of allochthonous material into the lake, and significantly affected the stratigraphic distributions of all elements. Some trace elements, such as As, Hg and Zn, are probably effectively retained in the catchment, whereas Cr tends to be readily exported from the catchment. Atmospheric deposition affected not only elements of anthropogenic origin (As, Ba, Br, Hg, Sb, Zn and Cr) that started to increase after the 1970s, but also those of terrestrial origin (Ca, Fe, Na). Introduction of fish into the lake in 1991 and the subsequent increase in primary production, affected the distribution of Ca and elements that are redoxsensitive and/or associated with OM (As, Ba, Fe, Sb, U, Zn). Fe minerals in uppermost 6J sediments have a strong influence on the distribution of several trace elements. As and Zn closely tracked Fe, whereas Sb was likely released after oxidation. Climate change could also have enhanced inputs of elements from the catchment, but such changes were likely overwhelmed by the effects of increased eutrophication.

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Section: Site Descriptionmentioning

confidence: 99%

Section: Site Descriptionmentioning

confidence: 99%

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Recent changes in major and trace elements in sediments from a remote mountain lake (6th Triglav Lake) in the Julian Alps, NW Slovenia

et al. 2020

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“…Eutrophication has been the pre-eminent environmental problem affecting the world's lakes over the past four decades (Schindler, 2006), resulting in major changes to lentic primary production such as the promotion of cyanobacterial blooms and subsequent reductions in water transparency, deteriorating oxygen conditions, changes in the composition and structure of aquatic food webs, and toxicity effects (Paerl, 1988;Muri et al, 2013). Assessing the past trophic status of lakes may provide valuable baseline information with which to inform and improve management protocols and strategies for restoration (Smol, 2008).…”

Section: Introductionmentioning

confidence: 99%

Experimental and geochemical evidence for Δ7/Δ5 sterol ratios as indicators of trophic status in Lake Fuxian, a great lake in Yunnan Province, SW China

Zhang

Liu

et al. 2016

Limnologica

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The reliability of 7/5 sterol ratios as an indicator of trophic status in Lake Fuxian was tested with in situ nutrient enrichment incubation experiment and a comparison of 7/5 values in the strata of a sediment core with the known chronology of nutrient enrichment in the lake. The results indicated that the 7/5 sterol ratios (including sum of 7/sum of 5 sterol ratios and C27-C29 7/C27-C29 5 sterol ratios) in the incubation water increased consistently with total phosphorus (TP) and total nitrogen (TN) concentration across the full experimental range from 0.012 to 0.130 mg/L and from 0.068 to 1.351 mg/L, respectively. The covariation between 7/5 sterol ratios and TP and TN concentration could be explained by enhanced productivity of 7 sterol-producing green algae (e.g., Scenedesmus sp.) under the prevailing nutrient conditions. A sediment core from Lake Fuxian showed a two-stage increase in C27-C29 7/C27-C29 5 sterol ratios over time, including a small rise from 1951 to 1986, and a much greater increase since 1986. These results coincide with the two-stage eutrophication previously documented in Lake Fuxian using geochemical evidence and water quality monitoring data. This study therefore demonstrates 7/5 sterol ratio as a credible descriptor of trophic status in Lake Fuxian.

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“…In arctic and alpine lakes, however, climate warming not only influences the water DO by increasing water column stratification but also leads to a reduction in catchment snow and ice-cover. That causes changes in hydrology, speeds up weathering processes, and may accelerate the delivery of terrestrial OM to the aquatic environment which consumes DO through bacterial and chemical oxidation (Battarbee et al, 2002; Feng et al, 2013; Muri et al, 2013; Zhang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Geochemical records of anoxic water mass expansion in an oligotrophic alpine lake (Yunnan Province, SW China) in response to climate warming since the 1980s

Zhang

Liu

et al. 2016

The Holocene

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In order to elucidate the effect of recent warming, we studied lipid biomarkers and trace elements in a dated sediment core from Lake Heihai, a small, deep, and ultraoligotrophic alpine lake in Yunnan Province (SW China), being only marginally affected by anthropogenic activities. The variation in lipid biomarkers (such as 10-methyl-C 16:0 fatty acid (FA), iso-branched C 15 (i-C 15 ) and anteiso-branched C 15 (ai-C 15 ) FA, and tetrahymanol) suggests a rapid productivity increase in sulfate reducing bacteria and ciliates since 1980, likely reflecting expansion of the hypolimnion anoxia and a prolonged duration of an oxic-anoxic chemocline in the water column. The concentrations of element molybdenum (Mo) in pre-1980 sediments approach the values in average crust. After 1980, the concentration increased, reaching levels approximately sixfold higher than the initial abundances. This likely reflects a high authigenic Mo deposition when the bottom water was more anoxic and enrichment in H 2 S. The suggested spatial and temporal expansion of the anoxic bottom water since 1980 was probably a response to the regional climate warming, resulting in stronger water column stratification and terrestrial grass inputs to the lake, and thus higher dissolved oxygen (DO) loss in hypolimnion.

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Consequences of anthropogenic activity for two remote alpine lakes in NW Slovenia as tracked by sediment geochemistry

Cited by 17 publications

References 34 publications

Recent changes in major and trace elements in sediments from a remote mountain lake (6th Triglav Lake) in the Julian Alps, NW Slovenia

Recent changes in major and trace elements in sediments from a remote mountain lake (6th Triglav Lake) in the Julian Alps, NW Slovenia

Experimental and geochemical evidence for Δ7/Δ5 sterol ratios as indicators of trophic status in Lake Fuxian, a great lake in Yunnan Province, SW China

Geochemical records of anoxic water mass expansion in an oligotrophic alpine lake (Yunnan Province, SW China) in response to climate warming since the 1980s

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