Lithological controls on lake water biogeochemistry in Maritime Antarctica

Nazlı Olgun*, Ufuk Tarı, Nurgül Balcı, Şafak Altunkaynak, Işıl Gürarslan, Sevil Deniz Yakan, Frederic Thalasso, María Soledad Astorga-España, Léa Cabrol, Céline Lavergne, Linn Hoffmann

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Özet

Although the Antarctic lakes are of great importance for the climate and the carbon cycle, the lithological influences on the input of elements that are necessary for phytoplankton in lakes have so far been insufficiently investigated. To address this issue, we analyzed phytoplankton cell concentrations and chemical compositions of water samples from lakes, ponds and a stream on Fildes and Ardley Islands of King George Island in the South Shetland Archipelago. Furthermore, lake sediments, as well as soil and rock samples collected from the littoral zone were analyzed for their mineralogical/petrographic composition and pollutant contents of polycyclic aromatic hydrocarbons (PAHs). In addition, leaching experiments were carried out to with the lithologic samples to investigate the possible changes in pH, alkalinity, macronutrients (N, P, Si), micronutrients (e.g. Fe, Zn, Cu, Mn), anions (S, F, Br), and other cations (e.g. Na, K, Mg, Ca, Al, Ti, V, Cr, Co, Ni, As, Se, Pb, Sb, Mo, Ag, Cd, Sn, Ba, Tl, B). Our results showed that phytoplankton levels varied between 15 and 206 cells/mL. Chlorophyll-a concentrations showed high correlations with NH4, NO3. The low levels of PO4 (<0.001 mg/L) indicated a possible P-limitation in the studied lakes. The composition of rock samples ranged from basalt to trachybasalt with variable major oxide (e.g. SiO2, Na2O and K2O) contents and consist mainly quartz, albite, calcite, dolomite and zeolite minerals. The concentrations of total PAHs were below the toxic threshold levels (9.55–131.25 ng g−1 dw). Leaching experiments with lithologic samples indicated major increase in pH (up to 9.77 ± 0.02) and nutrients, especially PO4 (1.03 ± 0.04 mg/L), indicating a strong P-fertilization impact in increased melting scenarios. Whereas, toxic elements such as Pb, Cu, Cd, Al and As were also released from the lithology, which may reduce the phytoplankton growth.

Orijinal dilİngilizce
Makale numarası168562
DergiScience of the Total Environment
Hacim912
DOI'lar
Yayın durumuYayınlandı - 20 Şub 2024

Bibliyografik not

Publisher Copyright:
© 2023 Elsevier B.V.

Finansman

This study was funded by the The Scientific and Technological Research Council of Türkiye (TÜBİTAK) Project # 118Y372 . Field expenses of N. Olgun were supported by Istanbul Technical University (ITU-BAP-Link2-Project # 40265 ). F. Thalasso, M. S. Astorga-España, L. Cabrol, and C. Lavergne were supported by the Instituto Antártico Chileno (INACH) Project RT-14-15 . C. Lavergne was also funded by the Chilean grant ANID FONDECYT # 3180374 and the INACH project FP_07-18 . We thank M. A. Kurt for ICP-MS measurements, Ezgi Tok and Cansu Demirel for assistance in leaching experiments, Yağmur Güneş for her assistance in XRD measurements, and Nadjejda Espinel-Velasco for assistance in phytoplankton cell count. We further thank Prof. Dr. Jose Retamales, the INACH team in the Chilean Station Julio Escudero and Prof. Dr. Burcu Özsoy, and the ITU-POLREC team for their logistic support. This study was carried out under the auspices of the Presidency of The Republic of Türkiye, supported by the Ministry of Industry and Technology, and coordinated by TÜBİTAK MAM Polar Research Institute. This study was funded by the The Scientific and Technological Research Council of Türkiye (TÜBİTAK) Project #118Y372. Field expenses of N. Olgun were supported by Istanbul Technical University (ITU-BAP-Link2-Project #40265). F. Thalasso, M. S. Astorga-España, L. Cabrol, and C. Lavergne were supported by the Instituto Antártico Chileno (INACH) Project RT-14-15. C. Lavergne was also funded by the Chilean grant ANID FONDECYT #3180374 and the INACH project FP_07-18. We thank M. A. Kurt for ICP-MS measurements, Ezgi Tok and Cansu Demirel for assistance in leaching experiments, Yağmur Güneş for her assistance in XRD measurements, and Nadjejda Espinel-Velasco for assistance in phytoplankton cell count. We further thank Prof. Dr. Jose Retamales, the INACH team in the Chilean Station Julio Escudero and Prof. Dr. Burcu Özsoy, and the ITU-POLREC team for their logistic support. This study was carried out under the auspices of the Presidency of The Republic of Türkiye, supported by the Ministry of Industry and Technology, and coordinated by TÜBİTAK MAM Polar Research Institute.

FinansörlerFinansör numarası
ANID FONDECYTFP_07-18, 3180374
ITU-POLREC
Ministry of Industry and Technology
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu118Y372
Istanbul Teknik Üniversitesi40265
Institut chilien de l'AntarctiqueRT-14-15

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