Implementation of ecological modeling as an effective management and investigation tool: Lake Kinneret as a case study

The need for scientifically based management of lakes, as key water resources, requires the establishment of quantitative relationships between in-lake processes responsible for water quality (WQ) and the intensity of major management measures (MM, e.g. nutrient loading). In this paper, we estimate the impact of potential changes in nutrient loading on the Lake Kinneret ecosystem. Following validation of the model against a comprehensive dataset, we applied an approach that goes beyond scenario testing by linking the lake ecosystem model DYRESM–CAEDYM with a set of ecosystem variables included in a pre-assessed system of water quality indices. The emergent properties of the ecosystem predicted from the model simulations were also compared with lake data as a form of indirect validation of the model. Model output, in good agreement with lake data, indicated differential effects of nitrogen and phosphorus nutrient loading on concentrations, and major in-lake fluxes, of TN and TP, and dynamics and algal community structure. Both model output and lake data indicated a strong relationship between nitrogen loading and in-lake TN values. This relationship is not apparent for phosphorus and only a weak relationship exists between phosphorus loading and in-lake TP. The modeling results, expressed in terms of water quality, allowed establishment of critical/threshold values for the nutrient loads. Implementation of the ecological modeling supplemented with the quantified set of WQ indices allowed us to take a step towards establishment of the association between permissible ranges for water quality and major management measures, i.e. towards sustainable management.

[1]  Peter Yeates,et al.  Pseudo two‐dimensional simulations of internal and boundary fluxes in stratified lakes and reservoirs , 2003 .

[2]  Jason P. Antenucci,et al.  Simulating the thermal dynamics of Lake Kinneret , 2003 .

[3]  T. Zohary,et al.  Microzooplankton dominate carbon flow and nutrient cycling in a warm subtropical freshwater lake , 2007 .

[4]  D. Hodell,et al.  Using carbon isotopes of bulk sedimentary organic matter to reconstruct the history of nutrient loading and eutrophication in Lake Erie , 1995 .

[5]  George B. Arhonditsis,et al.  Eutrophication model for Lake Washington (USA) Part II-model calibration and system dynamics analysis , 2005 .

[6]  W. L. Webb,et al.  Carbon dioxide exchange of Alnus rubra , 1974, Oecologia.

[7]  J. R. Romero,et al.  One- and three-dimensional biogeochemical simulations of two differing reservoirs , 2004 .

[8]  Sven Erik Jørgensen,et al.  State-of-the-art of ecological modelling with emphasis on development of structural dynamic models , 1999 .

[9]  M. B. Beck,et al.  On the problem of model validation for predictive exposure assessments , 1997 .

[10]  U. Pollingher.  Phytoplankton periodicity in a subtropical lake (Lake Kinneret, Israel) , 1984, Hydrobiologia.

[11]  P. Dillon,et al.  A Simple Method for Predicting the Capacity of a Lake for Development Based on Lake Trophic Status , 1975 .

[12]  George B. Arhonditsis,et al.  Eutrophication model for Lake Washington (USA): Part I. Model description and sensitivity analysis , 2005 .

[13]  E. Jeppesen,et al.  Response of fish and plankton to nutrient loading reduction in eight shallow Danish lakes with special emphasis on seasonal dynamics , 2005 .

[14]  L. Håkanson,et al.  Modelling the impact of water level fluctuations on water quality (suspended particulate matter) in Lake Kinneret, Israel. , 2000 .

[15]  Moshe Gophen,et al.  Nitrogen deficiency, phosphorus sufficiency, and the invasion of Lake Kinneret, Israel, by the N2-fixing cyanobacterium Aphanizomenon ovalisporum , 1999, Aquatic Sciences.

[16]  L. Håkanson,et al.  Water Quality Quantification: Basics and Implementation , 2006, Hydrobiologia.

[17]  L. Håkanson,et al.  Management criteria for lake ecosystems applied to case studies of changes in nutrient loading and climate change , 2003 .

[18]  David P. Hamilton,et al.  A numerical simulation of the role of zooplankton in C, N and P cycling in Lake Kinneret, Israel , 2006 .

[19]  Y. Yacobi,et al.  Evaluation of community respiratory mechanisms with oxygen isotopes: A case study in Lake Kinneret , 2002 .

[20]  M. Tilzer.  Large Lakes: Ecological Structure and Function , 1990 .

[21]  K. Hambright,et al.  Composite water quality : Evaluation and management feedbacks , 2007 .

[22]  A. Gasith,et al.  Effects of Water Level Fluctuation on the Structure and Function of the Littoral Zone , 1990 .

[23]  Kent W. Thornton,et al.  Reservoir Limnology: Ecological Perspectives , 1990 .

[24]  Dennis Trolle,et al.  Predicting the effects of reduced external nitrogen loading on the nitrogen dynamics and ecological state of deep Lake Ravn, Denmark, using the DYRESM–CAEDYM model , 2008 .

[25]  R. Vollenweider,et al.  Advances in defining critical loading levels for phosphorus in lake eutrophication. , 1976 .

[26]  Lars Håkanson,et al.  Predictive Limnology: Methods for Predictive Modelling , 1995 .

[27]  F. H. Rigler,et al.  The phosphorus‐chlorophyll relationship in lakes1,2 , 1974 .

[28]  Bob Taft,et al.  Ohio 2004 Integrated Water Quality Monitoring and Assessment Report , 2004 .

[29]  T. Berman,et al.  Planktonic community production and respiration and the impact of bacteria on carbon cycling in the photic zone of Lake Kinneret , 2004 .

[30]  N. Anderson,et al.  Ecological effects of reduced nutrient loading (oligotrophication) on lakes: an introduction , 2005 .

[31]  T. Zohary,et al.  Lake Kinneret dissolved oxygen regime reflects long term changes in ecosystem functioning , 1998 .

[32]  Jacco C. Kromkamp,et al.  A computer model of buoyancy and vertical migration in cyanobacteria , 1990 .

[33]  David P. Hamilton,et al.  Modelling the relative importance of internal and external nutrient loads on water column nutrient concentrations and phytoplankton biomass in a shallow polymictic lake , 2008 .

[34]  T. Berman,et al.  Indices of water quality for sustainable management and conservation of an arid region lake, Lake Kinneret (Sea of Galilee), Israel , 2000 .

[35]  C. Alewell,et al.  Use of objective criteria for the assessment of biogeochemical ecosystem models , 1998 .

[36]  Daniel E. Schindler,et al.  Chlorophyll Variability, Nutrient Input, and Grazing: Evidence from Whole‐ Lake Experiments , 1996 .

[37]  Jiří V. Outrata,et al.  An optimization model for the economic control of reservoir eutrophication , 1982 .

[38]  Robert M. Friedman,et al.  The Use of Models for Water Resources Management, Planning, and Policy , 1984 .

[39]  Daniel L. Tufford,et al.  Spatial and temporal hydrodynamic and water quality modeling analysis of a large reservoir on the South Carolina (USA) coastal plain , 1999 .

[40]  Tamar Zohary,et al.  Changes to the phytoplankton assemblage of Lake Kinneret after decades of a predictable, repetitive pattern , 2004 .

[41]  Albrecht Gnauck,et al.  Freshwater Ecosystems: Modelling and Simulation , 1985 .

[42]  J. Talling,et al.  THE PHYTOPLANKTON POPULATION AS A COMPOUND PHOTOSYNTHETIC SYSTEM , 1957 .

[43]  T. Berman,et al.  Lake Kinneret phytoplankton: Stability and variability during twenty years (1970–1989) , 1992, Aquatic Sciences.

[44]  Barbara A. Adams-Vanharn,et al.  Evaluation of the current state of mechanistic aquatic biogeochemical modeling: citation analysis and future perspectives. , 2006, Environmental science & technology.

[45]  R. Wanninkhof.  Relationship between wind speed and gas exchange over the ocean , 1992 .

[46]  Craig A. Stow,et al.  Phosphorus loading reductions needed to control blue green algal blooms in Lake Mendota , 1998 .

[47]  Jan Köhler,et al.  Lake responses to reduced nutrient loading - an analysis of contemporary long-term data from 35 case studies , 2005 .

[48]  Gregory A. Lang,et al.  Dynamics of Lake Michigan Plankton: A Model Evaluation of Nutrient Loading, Competition, and Predation , 1988 .

[49]  S. Hülsmann,et al.  Predicting the effect of climate change on temperate shallow lakes with the ecosystem model PCLake , 2007, Hydrobiologia.

[50]  K. Hambright,et al.  A Proposed Framework for the Management of Water Quality in Arid‐Region Lakes , 1996 .

[51]  Milan Straškraba,et al.  Ecotechnological models for reservoir water quality management , 1994 .

[52]  R. Rijsdijk,et al.  Stochastic modelling of nutrient loading and lake ecosystem response in relation to submerged macrophytes and benthivorous fish , 2003 .

[53]  I. Gotham,et al.  The effect of environmental factors on phytoplankton growth: Light and the interactions of light with nitrate limitation1 , 1981 .