The Impacts of climate change and land use on the ecosystem structure and services of Lake Beyşehir

Download

index.pdf

Date

2017

Author

Bucak, Tuba

Metadata

Show full item record

Item Usage Stats

362
views

182
downloads

In this thesis, the main aim was to predict the impacts of climatic and land use changes on the ecosystem structure of Lake Beyşehir with the perspective of ecosystem services. Modeling results revealed the sensitivity of ecological and hydrological dynamics of Lake Beyşehir to climatic changes. Climate change scenarios led to reductions in total inflow rates and water levels, and the results showed that significant reductions in water abstraction are needed to maintain the lake in the future. The outcomes of the current study also indicated an important role of projected land use change on nutrient loading from the catchment, though with minor effects on surface runoff. Although lake models differed in their predictions for future nutrient concentrations and Chlorophyll-a, they both indicated a significant increase in cyanobacteria biomass in the future which may result in degradation of the lake water quality. Analysis of long-term ecosystem services revealed that the lakes’ services varied through time with a declining trend in provisional services (e.g., water level, fisheries), however, increased climate regulation services were recorded throughout the century. The water level was found to be important in affecting supporting services of the lake (e.g., biodiversity). Future projections also indicated that irrigation water service of the lake may decrease in the future considering climate change projections. Furthermore, increased cyanobacteria contribution may also affect the drinking water quality of the lake and may limit the drinking water use for certain periods with cyanobacteria bloom. All in all, the results highlighted that warmer and drier climate may decrease water availability and trigger cyanobacteria bloom that may lead to loss of ecosystem values and services of Lake Beyşehir if necessary adaptation measures are not undertaken.

Subject Keywords

Lakes., Lake ecology., Climatic changes.

URI

http://etd.lib.metu.edu.tr/upload/12620912/index.pdf
https://hdl.handle.net/11511/26390

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

The Impact of climate change on agricultural production in Mediterranean countries Atay, Mehmet Ufuk; Sarı, Ramazan; Yücel, İsmail; Department of Earth System Science (2015) The aim of the study is to determine the impact of climate change on agriculture for Mediterranean countries by employing vulnerability and econometric analysis. At first step, a composite agricultural vulnerability index is created by principal component analysis (PCA) for Mediterranean counties and world’s top 35 cereal producer countries. Then, based on index scores, countries are grouped by cluster analysis. Several indicators are selected from different international databases according to three compon...
Trend Analyses of Meteorological Variables and Lake Levels for Two Shallow Lakes in Central Turkey YAĞBASAN, ÖZLEM; Demir, Vandettin; Yazıcıgil, Hasan (2020-02-01) Trend analyses of meteorological variables play an important role in assessing the long-term changes in water levels for sustainable management of shallow lakes that are extremely vulnerable to climatic variations. Lake Mogan and Lake Eymir are shallow lakes offering aesthetic, recreational, and ecological resources. Trend analyses of monthly water levels and meteorological variables affecting lake levels were done by the Mann-Kendall (MK), Modified Mann-Kendall (MMK), Sen Trend (ST), and Linear trend (LT) ...
Impacts of climatic variables on water-level variations in two shallow Eastern Mediterranean lakes Yagbasan, Ozlem; Yazıcıgil, Hasan; Demir, Vahdettin (2017-08-01) Variations in temperature and precipitation have direct impacts on the physical, chemical and biological characteristics of the shallow lakes. This paper examines the possible linkages between climate variables and the water levels of shallow interconnected Lakes Mogan and Eymir, located 20 km south of Ankara in Central Anatolia. The variations in the lakes' water levels during 1996-2015 are studied and the impacts of climate variables on the lake levels are assessed to address the long-term consequences. T...
Modeling impacts of eutrophication and climate change in lake eymir using pclake model Kuzyaka, Esra; Beklioğlu, Meryem; Department of Biology (2015) The earliest studies in Lake Eymir showed that the lake used to be in a clear water state with submerged and emergent plants; however 25 years of raw sewage effluent led to eutrophication of the lake. Therefore, restoration measures were carried out including diversion of the sewage effluent and biomanipulation and Lake Eymir is the first wellknown successfully biomanipulated freshwater lake of Turkey. Although raw sewage effluent was diverted and the external nutrient loading was reduced, Lake Eymir still ...
Quantification of the Synergistic Effects of Eutrophication, Apex Predator Pressure, and Internal Processes on the Black Sea Ecosystem Salihoğlu, Barış (2013-12-01) In the present study, a model of the lower-trophic pelagic food web of the Black Sea is considered in order to provide a quantitative understanding of the marked changes in the food web structure in response to changing top-down and bottom-up control mechanisms due to eutrophication, overfishing, and climatic changes. The simulations consider three particular parameters controlling the changes in the ecosystem structure due to these stressors; (i) the magnitude of the nitrate flux into the euphotic layer fr...

Citation Formats

T. Bucak, “The Impacts of climate change and land use on the ecosystem structure and services of Lake Beyşehir,” Ph.D. - Doctoral Program, Middle East Technical University, 2017.