Eutrophication, Research and Management History of the Shallow Ypacaraí Lake (Paraguay)

Sustainability

RogerArturo Monte Domecq S.¹  Fátima Mereles²  Andrea Salvadore³  Marco Toffolon³  Guido Zolezzi³  GregorioAlejandro López Moreira M.³  Luigi Hinegk³  Franz Hölker⁴  Mario Insaurralde⁵  JuanFrancisco Facetti-Masulli⁶  JeanMichel Sekatcheff⁶  Andrés Wehrle⁶  JuanFrancisco Facetti⁶  Carmen Escribá⁷  Juan Escribá⁷  ClaudiaRaquel Ávalos⁸  Inocencia Peralta⁸  GilbertoAntonio Benítez⁸  Sebastiano Carrer⁹  Luca De Nat⁹  Martina Bocci⁹ 

[1] Centre for Appropriate Technology (CTA), Faculty of Sciences and Technology (FCYT), “Nuestra Señora de la Asunción” Catholic University (UCNSA), 1366 Asunción, Paraguay;Department of Botany, Faculty of Chemical Sciences (FCQ), National University of Asunción (UNA), 2169 San Lorenzo, Paraguay;Department of Civil, Environmental and Mechanical Engineering (DICAM), University of Trento (UniTN), 38123 Trento, Italy;Department of Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), 12587 Berlin, Germany;Department of Fishing and Aquaculture, Faculty of Veterinary Sciences (FCV), National University of Asunción (UNA), 2169 San Lorenzo, Paraguay;Faculty of Engineering, National University of Asunción (FIUNA), 2169 San Lorenzo, Paraguay;INYMA Consult S.R.L., 1580 Asunción, Paraguay;Multidisciplinary Centre for Technological Investigations (CEMIT), General Directorate of Scientific and Technological Research (DGICT), National University of Asunción (UNA), 2169 San Lorenzo, Paraguay;Thetis S.p.A., 30122 Venice, Italy;

关键词: turbid lake;    subtropical lake;    alternative stable states;    limnological study;    historical reconstruction;    cyanobacterial bloom;    light limitation;    trend analysis;    correlation analysis;    PCA;   

DOI  :  10.3390/su10072426

来源: DOAJ

【 摘 要 】

Ypacaraí Lake is the most renowned lake in landlocked Paraguay and a major source of drinking and irrigation water for neighbouring towns. Beyond its socioeconomic and cultural significance, it has great ecological importance, supporting a rich biodiversity. Rapid growth of human presence and activities within its basin has led to its environmental degradation, a heartfelt matter of high political concern that compels intervention. Here, by reconstructing the history of scientific and management-oriented research on this system, we provide a comprehensive assessment of current knowledge and practice to which we contribute our recent, novel findings. An upward trend in total phosphorus concentration confirms ongoing eutrophication of an already eutrophic system, evidenced by consistently high values of trophic state indices. Downward trends in water transparency and chlorophyll-a concentration support the hypothesis that primary production in this lake is fundamentally light limited. Statistical and other analyses suggest high sensitivity of the system to hydraulic, hydro-morphological and hydro-meteorological alterations arising, respectively, from engineering interventions, land use and climate change. By discussing knowledge gaps, opportunities for research and challenges for management and restoration, we argue that this case is of high scientific value and that its study can advance theoretical understanding of shallow subtropical lakes.

【 授权许可】

Unknown