@article{fdi:010088858,
  title = {{L}ithological controls on lake water biogeochemistry in {M}aritime {A}ntarctica},
  author = {{O}lgun, {N}. and {T}ari, {U}. and {B}alci, {N}. and {A}ltunkaynak, {S}. and {G}ürarslan, {I}. and {Y}akan, {S}. {D}. and {T}halasso, {F}. and {A}storga-{E}spaña, {M}. {S}. and {C}abrol, {L}{\'e}a and {L}avergne, {C}. and {H}offmann, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}lthough the {A}ntarctic 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. {T}o address this issue, we analyzed phytoplankton cell concentrations and chemical compositions of water samples from lakes, ponds and a stream on {F}ildes and {A}rdley {I}slands of {K}ing {G}eorge {I}sland in the {S}outh {S}hetland {A}rchipelago. {F}urthermore, 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 ({PAH}s). {I}n addition, leaching experiments were carried out to with the lithologic samples to investigate the possible changes in p{H}, alkalinity, macronutrients ({N}, {P}, {S}i), micronutrients (e.g. {F}e, {Z}n, {C}u, {M}n), anions ({S}, {F}, {B}r), and other cations (e.g. {N}a, {K}, {M}g, {C}a, {A}l, {T}i, {V}, {C}r, {C}o, {N}i, {A}s, {S}e, {P}b, {S}b, {M}o, {A}g, {C}d, {S}n, {B}a, {T}l, {B}). {O}ur results showed that phytoplankton levels varied between 15 and 206 cells/m{L}. {C}hlorophyll-a concentrations showed high correlations with {NH}4, {NO}3. {T}he low levels of {PO}4 (<0.001 mg/{L}) indicated a possible {P}-limitation in the studied lakes. {T}he composition of rock samples ranged from basalt to trachybasalt with variable major oxide (e.g. {S}i{O}2, {N}a2{O} and {K}2{O}) contents and consist mainly quartz, albite, calcite, dolomite and zeolite minerals. {T}he concentrations of total {PAH}s were below the toxic threshold levels (9.55-131.25 ng g(-1) dw). {L}eaching experiments with lithologic samples indicated major increase in p{H} (up to 9.77 +/- 0.02) and nutrients, especially {PO}4 (1.03 +/- 0.04 mg/{L}), indicating a strong {P}-fertilization impact in increased melting scenarios. {W}hereas, toxic elements such as {P}b, {C}u, {C}d, {A}l and {A}s were also released from the lithology, which may reduce the phytoplankton growth.},
  keywords = {{A}ntarctica ; {K}ing {G}eorge {I}sland ; {P}hytoplankton ; {L}ake ; {L}ithology ; {L}eaching ; {N}utrients ; {ANTARCTIQUE}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {912},
  numero = {},
  pages = {168562 [17 p.]},
  ISSN = {0048-9697},
  year = {2024},
  DOI = {10.1016/j.scitotenv.2023.168562},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088858},
}