TY - JOUR
T1 - Lake Koronia, Greece: Shift from Autotrophy to Heterotrophy with Cultural Eutrophication and Progressive Water-Level Reduction
AU - Mitraki, Chrysoula
AU - Crisman, Thomas L.
AU - Zalidis, George
PY - 2004/1/1
Y1 - 2004/1/1
N2 - Lake Koronia, a Ramsar site, is shallow, polymictic, hypertrophic and until recently was aerially the fourth largest lake in Greece. Although exceeding 5 m in the past, lake depth has declined progressively from 3.8 m in 1980 to < 1 m in 1997, reducing surface area and water volume by 50% and 80%, respectively. Specific conductivity increased from 1300 μS cm -1 in 1977 to >6000 μS cm -1 in 1991. Increased phosphate concentrations from the late 1970's (8-45 μg L -1 ) to the late 1990's (100-1000 μg L -1 ) document that the previously eutrophic system with a limited littoral zone switched to hypertrophy dominated by massive cyanobacteria blooms. Oxygen saturation of the water column increased progressively from about 80% in 1983 to full saturation about 1993, after which it decreased progressively to only 20% saturation in 1997. In spite of cyanobacteria dominance, community metabolism of the lake switched from progressively increasing autotrophy to rapidly advancing heterotrophy associated with progressive water-level reduction leading to fish extirpation in the lake.
AB - Lake Koronia, a Ramsar site, is shallow, polymictic, hypertrophic and until recently was aerially the fourth largest lake in Greece. Although exceeding 5 m in the past, lake depth has declined progressively from 3.8 m in 1980 to < 1 m in 1997, reducing surface area and water volume by 50% and 80%, respectively. Specific conductivity increased from 1300 μS cm -1 in 1977 to >6000 μS cm -1 in 1991. Increased phosphate concentrations from the late 1970's (8-45 μg L -1 ) to the late 1990's (100-1000 μg L -1 ) document that the previously eutrophic system with a limited littoral zone switched to hypertrophy dominated by massive cyanobacteria blooms. Oxygen saturation of the water column increased progressively from about 80% in 1983 to full saturation about 1993, after which it decreased progressively to only 20% saturation in 1997. In spite of cyanobacteria dominance, community metabolism of the lake switched from progressively increasing autotrophy to rapidly advancing heterotrophy associated with progressive water-level reduction leading to fish extirpation in the lake.
KW - Autotrophy
KW - Cultural eutrophication
KW - Greek lakes
KW - Heterotrophy
KW - Water-level reduction
UR - https://digitalcommons.usf.edu/geo_facpub/1700
UR - https://doi.org/10.1016/S0075-9511(04)80029-X
U2 - 10.1016/S0075-9511(04)80029-X
DO - 10.1016/S0075-9511(04)80029-X
M3 - Article
VL - 34
JO - Limnologica
JF - Limnologica
ER -