Impacts of eutrophication and water level change in turkish shallow lakes: a palaeolimnological approach utilizing plant remains and marker pigments

Download

index.pdf

Date

2016

Author

Levi, Eti Ester

Metadata

Show full item record

Item Usage Stats

285
views

141
downloads

Current study provides further understanding of plant macrofossil and sedimentary pigment utilization in comparison with modern and historical environmental variables. Moreover, it contributes to investigations for determining suitable macrophyte-based indices (water framework directive-WFD) that can be employed in Turkey. In total 44 small and mostly shallow lakes, covering the whole latitudinal gradient at western half of Turkey were sampled with snap-shot sampling and from another set of three large lakes cores were retrieved. Plant remains and pigments acquired from surface sediment samples showed significant accord to present-day plant and phytoplankton assemblages, respectively. Conductivity and trophic state were key environmental variables correlated with plants, also temperature and nutrients with phytoplanktonkton. Comparison of instrumental water-level data (40-100 years) with core samples from three lakes showed that effect of longer-term and pronounced water-level changes reflected in sediment record. Furthermore, employing plant remains in macrophyte-indice calculations increased the reliability of the results, which suggested that for shallow lakes, metrics based on species scores (including plant remains), and for deep lakes metrics using colonization depth may be more suitable. Being particularly useful for lakes in Mediterranean regions, that are especially vulnerable to hydrological constraints under climate change, these comparisons were conducted for the first time in Turkish shallow lakes and this study confirmed that sedimentary plant and phytoplankton remains are reliable indicators of environmental change. Furthermore, importance of conductivity, nutrients and temperature underpins the concerns on salinisation and eutrophication in Mediterranean region, supporting exacerbation of these problems as predicted by climate change projections.

Subject Keywords

Eutrophication., Water levels., Lake ecology., Paleolimnology.

URI

http://etd.lib.metu.edu.tr/upload/12619967/index.pdf
https://hdl.handle.net/11511/25633

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

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...
Impact of zooplankton grazing on phytoplankton in north temperate coastal lakes: changes along gradients in salinity and nutrients Christensen, Inge; Pedersen, Lisbeth Kjæreby; Søndergaard, Martin; Lauridsen, Torben L.; Tserenpil, Sh.; Richardson, Katherine; Alves Amorım, Cıhelıo; Pacheco, Juan Pablo; Jeppesen, Erik (2022-10-01) Zooplankton grazing at similar nutrient levels is generally regarded as lower in brackish than in freshwater lakes, but experimental evidence of this is lacking. Accordingly, we conducted short-term zooplankton grazing experiments in bottles with water from 12 Danish brackish lakes covering a large gradient in salinity (0.3-17.4 parts per thousand) and nutrient concentrations as well as with water from 24 mesocosms established in the same area with various salinities (0.5-12 parts per thousand), two nutrien...
Assessment of the trophic status of the Mersin bay waters, Northeastern Mediterranean Kaptan, Mehmet Salih; Tuğrul, Süleyman; Department of Chemical Oceanography (2013) Identifying the spatial and temporal variability of eutrophication related indicators such as Chlorophyll-a (Chl-a), oxygen saturation (DO%), dissolved inorganic nitrogen (DIN) and total phosphorus (TP), as a measure of the potential pressures and productivity, were measured within the Mersin Bay, a wide shelf region of the Cilician Basin located in the Northeastern Mediterranean Sea. This study aims to characterize the trophic status of the water masses in the eastern shelf waters of the bay fed by river d...
Evaluation of coal and water samples from Manisa-Soma-Deniş region conccerning Balkan Endemic Nephropathy and determination of Balkan Endemic Nephropathy risk Öztürk, Mehmet Sinan; Önen, A. Pırıl; Department of Geological Engineering (2006) The water and coal samples from the Manisa-Soma-Deniş region were studied on the basis of their basic characteristics, inorganic and organic parameters. Coal samples were determined as low-quality lignite. They have high concentrations of arsenic, uranium and lead. The organics in the coal samples are of aliphatic hydrocarbons and their derivatives (alkanes and alcohols), methyls, phthalates, naphtalenes and benzenes. They are inactive and low in concentrations. Water samples have basic characteristics with...
Modelling of Dredged materal disposal Mersin Bay Case Study Sadighrad, Ehsan; Tuğrul, Süleyman; Salihoğlu, Barış (null; 2015-10-10) Management of disposal of solid materials dredged from harbours, shipping channels and coastal environments for different purposes is essential for sustainable land/marine ecosystems, keeping economic values and human quality of life along coastal areas. Therefore, comprehensive and detailed investigations of geo-chemical properties of organic/inorganic pollutants in dredged materials and principal physical and bio-geo-chemical properties of the selected disposal sites are commonly a prerequisite for any pl...

Citation Formats

E. E. Levi, “Impacts of eutrophication and water level change in turkish shallow lakes: a palaeolimnological approach utilizing plant remains and marker pigments,” Ph.D. - Doctoral Program, Middle East Technical University, 2016.