In recent years Lugano Lake has been plagued with late summer blooms of toxic blue-green algae or cyanobacteria. This video examines the history of this deep glacial lake in the canton of of Ticino, Switzerland and how it has gone from a cool clear water low nutrient oligotrophic lake to a warmer nutrient rich eutrophic lake prone to periodic out breaks of algal blooms. A lake once dominate by a green alage-zooplankton-filter feeding fish food chain has no completely lost its most numerous historic resident arborella fish. A fishery over two thousand years old was based on this species and food web. This video discusses the impact of increased surface temperatures in recent years, the beginnings of nutrient pollution in the 60's and subsequent efforts to reduce phosphate and nitrate input with mixed results.
Attributions:
Arborella photo
Etrusco 25, CC BY-SA 3.0 creativecommons.org/licenses/..., via Wikimedia Commons
Bluegreen algae photo
CSIRO, CC BY 3.0 creativecommons.org/licenses/..., via Wikimedia Commons
Green Algae Photo
Simon Andrews, CC BY-SA 2.5 creativecommons.org/licenses/..., via Wikimedia Commons
Zooplankton photo
Adriana Zingone, Domenico D'Alelio, Maria Grazia Mazzocchi, Marina Montresor, Diana Sarno, LTER-MC team, CC BY-SA 4.0 creativecommons.org/licenses/..., via Wikimedia Commons
1 мар 2024
