Advanced Approach for Synoptic Monitoring of a Lake Ecosystem: Lake Kinneret as a Model

<p>During the last 80 years, the Lake Kinneret and its Drainage Basin ecosystems have undergone significant anthropogenic and natural modifications. Man made operations in the drainage basin and in the lake, accompanied by natural climatic conditions, resulted in modifications of the ecosystem structure. Old lake Hula and swamps were dredged and were being converted for agricultural development. Years later, the partial land utilization was modified, in an operation, referred to as the Hula Project operation. Twenty years later, several improvements for the Hula Project structure are suggested. Regimes of nutrient inputs into Lake Kinneret were changed by a decline in Nitrogen influx. Air and epilimnetic water temperature increase, as well as change of the nutrients composition. The lake ecosystem was shifted from P to N limitation. The phytoplankton and fish communities in the lake, were respectively modified. There were enhancements in N<sub>2</sub>-Fixing Cyano-bacteria and Bleak fishes beside the partial decline of tilapias. The impact of Albedo and ENSO (EL-NIÑO/SOUTHERN OSCILLATION) factors is indicated. A combined impact of the natural and anthropogenic parameters are involved. An innovation in the management design within the lake, and the drainage basin ecosystems are suggested: 1: Cutoff of beach vegetation along 20% of the shoreline length enabling public recreation; 2: Intensification of Bleak and improvement of Tilapias fisheries aimed at both, the fishers’ income and the water quality improvement; 3) Slight changes in the Hula Project structure.</p>

Download Full-text

Exploring the role of fish in a lake ecosystem (Lake Kinneret, Israel) by coupling an individual-based fish population model to a dynamic ecosystem model

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f2011-051 ◽

2011 ◽

Vol 68 (7) ◽

pp. 1265-1284 ◽

Cited By ~ 18

Author(s):

Vardit Makler-Pick ◽

Gideon Gal ◽

James Shapiro ◽

Matthew R. Hipsey

Keyword(s):

Population Model ◽

Fishery Management ◽

Coupled Model ◽

Fish Population ◽

Lake Kinneret ◽

Trophic Levels ◽

Management Tool ◽

Lake Ecosystem ◽

Ecosystem Research

To explore the role that fish play in aquatic ecosystems, a hydrodynamic–ecological model (DYRESM–CAEDYM) was coupled to a novel fish population model. The coupled model (DYCD–FISH) combined two modelling approaches: a complex dynamic model and an individual-based model. The coupled model simulates fish growth population dynamics and predicts fish impacts on various ecosystem components, including nutrients and lower trophic levels. The model was employed to explore the role of the dominant fish in Lake Kinneret (Israel), Acanthobrama terraesanctae (Kinneret bleak, or in Hebrew, lavnun ha’kinneret; hereafter lavnun). Model results suggested that the lavnun has a significant impact (p < 0.05) on the magnitude of output variables including its prey food (the predatory and microzooplankton), major nutrients such as ammonium (NH4) and phosphate (PO4), and on several phytoplankton species, but not on the seasonality of any of the output variables. Since the model incorporates trophic levels from nutrients to fish, it revealed the nonlinear dynamic impacts of fish on different ecosystem components and in particular has led to quantitative insights into the relative influence of top-down control on water quality attributes. Besides being an ecosystem research tool, DYCD–FISH can also be employed as a fishery management tool, and in particular facilitate ecosystem-based fishery management.

Download Full-text

Lake Kinneret levels and active faulting in the Tiberias area

Israel Journal of Earth Sciences ◽

10.1560/k54y-l2ln-994u-mg4h ◽

2004 ◽

Vol 53 (3-4) ◽

pp. 199-205 ◽

Cited By ~ 10

Author(s):

Nissim Hazan ◽

Mordechai Stein ◽

Shmuel Marcoc

Keyword(s):

Lake Kinneret ◽

Active Faulting

Download Full-text

Assessing Impact of Freshwater Lake Ecosystem on Residential Property Prices using Hedonic Property Pricing approach: Evidence from Vellayanilake of Kerala

Indian Journal of Economics and Development ◽

10.35716/ijed/20002 ◽

2020 ◽

pp. 125-130

Keyword(s):

Economic Effect ◽

Lake Ecosystem ◽

Aesthetic Value ◽

Market Prices ◽

Scenic Beauty ◽

Property Prices ◽

Property Price ◽

Valuation Technique ◽

Hedonic Property ◽

The Impact

ABSTRACT The ecosystem services provided by wetlands can be direct or indirect. The direct services can be mostly valued through market prices, but the indirect service like aesthetic beauty and its impact on property prices surrounding the natural resource cannot be directly measured. To single out the economic effect of particular amenity which influenced the land property prices, the advanced valuation technique Hedonic property pricing was most popularly used. In this study, it was attempted to assess using the hedonic property pricing technique, the impact of the presence of the freshwater body, the Vellayani Lake on land property prices surrounding it. The results revealed that the marginal implicit price of getting one cent of land with lake view evaluated at mean property price of Rs. 2,44250 was Rs.79171. The total aesthetic value of land with the scenic beauty of the lake was Rs. 275.92 crores.

Download Full-text

The lake ecosystem simulation program

Water Science & Technology ◽

10.2166/wst.1995.0331 ◽

1995 ◽

Vol 31 (8) ◽

pp. 367-370

Author(s):

J. Heringa ◽

H. Hylkema ◽

M. Kroes ◽

E. Ludden ◽

P. G. van Schaick Zillesen

Keyword(s):

Mathematical Model ◽

Water Resources ◽

Computer Program ◽

Water Resources Management ◽

Lake Ecosystem ◽

Original Research ◽

Ecological Processes ◽

Resources Management ◽

Lake Ecology ◽

Ecosystem Simulation

The computer program LAKE simulates a shallow lake ecosystem. The program is based on a mathematical model. In the model the most important aspects of several models for water resources management are integrated (Collins and Wlosinski, 1988; Jørgensen, 1976; Jørgensen et al., 1978; Scheffer, 1988). Furthermore, the model describes several ecological processes that have not yet been described by lake-ecosystem models so far. In the computer program, the mathematical model and an advanced, object oriented, user interface are combined. Following this approach the use of the original research models was extended to a use for the purpose of teaching lake ecology. We suggest that the same approach may be followed to open research models to other groups concerned with water resources management, such as management authorities, industry, agricultural extension, nature conservation and recreation.

Download Full-text

Assessment of Turbulent Processes in Lake Kinneret by the Two-Dimensional Reservoir Water Quality Model “Better”

Water Science & Technology ◽

10.2166/wst.1993.0573 ◽

1993 ◽

Vol 27 (7-8) ◽

pp. 381-385 ◽

Cited By ~ 1

Author(s):

Y. Oziransky ◽

B. Shteinman

Keyword(s):

Water Body ◽

River Mouth ◽

Temporal Distribution ◽

Lake Kinneret ◽

Toxic Substances ◽

Two Dimensional ◽

Quality Model ◽

Reservoir Water ◽

The North ◽

Longitudinal Gradients

Data of high spatial and temporal resolution, and a special sampling program are essential for successful application of mathematical models designed to reproduce observed seasonal patterns of temperature, dissolved oxygen, nutrients, pH, and algal biomass for both vertical and longitudinal gradients in a water body. Lake Kinneret suspended solids are of great potential value for estimating transport, exposure to water body elements, and fate of many toxic substances. Therefore the distribution of admixtures in two longitudinal and five vertical segmentation schemes were examined with the two-dimensional water body quality box model “BETTER” (Bender et al, 1990). The transects were taken in the north-western part of Lake Kinneret close to the Jordan River mouth and the National Water Carrier (NWC) head pumping station. The outflow volumes were given according to regular sampling of natural speed of water outflow from different lake layers under calm conditions. Temporal distribution of mixing concentrations as well as turbulent diffusion horizontal coefficients due to the spatial distribution of turbulent scale were obtained during the model's run with the December 1991 data.

Download Full-text

Development of a water temperature-ecological model to stimulate global warming effects on lake ecosystem

Water Science & Technology ◽

10.2166/wst.1996.0627 ◽

1996 ◽

Vol 34 (7-8) ◽

pp. 237-244 ◽

Cited By ~ 1

Author(s):

Masaaki Hosomi ◽

Tetsu Saigusa ◽

Kenichi Yabunaka ◽

Takuya Okubo ◽

Akihiko Murakami

Keyword(s):

Global Warming ◽

Water Temperature ◽

Thermal Stratification ◽

Ecological Model ◽

Nutrient Release ◽

Eddy Diffusion ◽

Nutrient Concentrations ◽

Lake Ecosystem ◽

Phytoplankton Species ◽

Freezing And Thawing

This paper describes a newly developed combined water temperature-ecological (WT-ECO) model which is employed to simulate the effects of global warming on lake and reservoir ecosystems. The WT model includes (i) variations in the eddy diffusion coefficient based on the degree of thermal stratification and the velocity of wind, and (ii) a sub-model for simulating the freezing and thawing processes of surface water, water temperatures, and the mixing rates between two adjacent layers of water. The ECO model then uses these results to calculate the resultant effect on a lake's ecological dynamics, e.g., composition of phytoplankton species, their respective concentrations, and nutrient concentrations. When the model was benchmarked against Lake Yunoko, a dimictic lake, fairly good agreement was obtained over a 4-yr period; thereby indicating it is suitably calibrated. In addition, to assess the effects of global warming on a lake ecosystem, changes in Lake Yunoko's water temperature/quality were simulated in response to an increase in air temperature of 2 - 4°C. Results indicate that such an increase will (i) increase thermal stratification in summer, which increases the nutrient concentrations in bottom water due to nutrient release from bottom sediment, (ii) increase the concentration of phytoplankton at the beginning of the autumn circulation period, and (iii) change the composition of phytoplankton species.

Download Full-text

CLIMATE AND HYDROLOGIC DRIVERS OF LAKE ECOSYSTEM DYNAMICS IN AN ALPINE CATCHMENT, COLORADO, USA

10.1130/abs/2016am-282469 ◽

2016 ◽

Author(s):

Diane M. McKnight ◽

◽

Eric Sokol ◽

Mark Williams ◽

Katherina Hell ◽

...

Keyword(s):

Ecosystem Dynamics ◽

Lake Ecosystem

Download Full-text