E. K. Magyari’s research while affiliated with Eötvös Loránd University and other places

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Publications (2)


Location of the study area (Retezat Mountains) and the analysed lakes with the catchments and land cover types of Lake Ana (1940 m) and Lake Peleaga (2122 m) (a); for visualization we used the program ArcMap; photo of Lake Ana (b); photo of Lake Peleaga (c)
Age-depth model, sediment accumulation rate (SAR) and water content in the gravity cores of Lake Ana (A) and Lake Peleaga (B) based on the CRS method and linear extrapolation beyond the.²¹⁰Pb dated sediment sections; gray-shaded areas indicate the extrapolated period; for visualization we used CorelDraw 2021
Selected geochemical element concentrations, Fe/Mn ratio, chlorophyll derivatives (SPDU), organic content (LOI), PC1-PC2 stratigraphic plots, nitrogen isotope ratio (δ¹⁵N) and carbon isotope ratio (δ.¹³C) from Ana-2021, Lake Ana (1940 m) (a) and Pel-2021, Lake Peleaga (2122 m) (b) Retezat Mts, S Carpathians, Romania; concentrations of calcium (Ca), strontium (Sr), magnesium (Mg), iron (Fe), aluminum (Al), potassium (K), silica (Si), manganese (Mn), zinc (Zn), copper (Cu) and lead (Pb) are displayed with Fe/Mn ratio, LOI (loss-on-ignition), SPDU DM (chlorophyll-a) and stratigraphic plot of the first and second principal component axis (PC 1 and PC 2); gray bands mark the periods with enhanced erosion activity; for visualization we used C2 and CorelDraw 2021
Relative abundances of the most common chironomid taxa from the Lake Ana (a) and Lake Peleaga (b) gravity cores (2021); significant chironomid assemblage zones were defined by CONISS; chironomid feeding groups (blue: collector-filterer, green: collector-gatherer, red: predator, yellow: shredder, black: others), HC (chironomid head capsule) concentration, the number of chironomid taxa and stratigraphic plot of the first and second principal component axis (PC 1 and PC 2); for visualization we used C2 and CorelDraw 2021
Relative pollen frequency diagram with PC1 stratigraphic plot, Cladocera abundances, Daphnia sp. ephippia accumulation rate and distribution of littoral and planktonic Cladocera taxa with PC1 and PC2 stratigraphic plots in Lake Ana (a) and Lake Peleaga (b) from the Retezat Mts, South Carpathians with CONISS zonation; for visualization we used C2, Psimpol and CorelDraw 2021

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Resilience of alpine lake macroinvertebrate communities to climate change: a view from the South Carpathian Mountains
  • Article
  • Full-text available

January 2025

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136 Reads

Hydrobiologia

E. Tombor

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J. L. Korponai

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E. K. Magyari

Remote mountain lakes experience accelerating ecological change worldwide due to the ongoing warming. In this study, we analyze two alpine lakes, Lake Ana (1940 m) and Lake Peleaga (2122 m), from the Retezat National Park in Romania. The sediment cores cover ~ 400 years, and our aim is to reconstruct critical transitions, the rate of ecosystem change and its driving factors. The extent of human disturbance is weak at these lakes today. Therefore, we assumed the principal role of summer warming in potential ecosystem reorganizations. For verifying this assumption, we use a multi-proxy approach including Pb²¹⁰/Cs¹³⁷ dating, chironomid, pollen, Cladocera analyses, SPDU, element concentration, organic matter, total nitrogen, C/N ratio and δ¹⁵N measurements, chord-distance-analysis (RoC) and chironomid-based temperature reconstruction. The assemblages indicated cold, oligotrophic environment and remained relatively stable despite climate change and human pressure, in contrast to assemblages studied from higher altitude (> 2300 m) lakes in the Alps. Our temperature reconstructions show warming from the 2000’s, but the results are influenced by fish introduction in the 1990s. We conclude that chironomid communities have not yet passed critical thresholds; the fauna reacted with restrained alterations, which is exceptional in the region, and highlight the importance of altitude and environmental protection.

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