Monitoring of water clarity, and submerged and emergent plant coverages in shallow lake wetlands using remote sensing techniques

Doğan, Özge Karabulut
Shallow lake wetlands, for which aquatic plants (macrophytes) and water clarity are the key indicators of ecological status, provide valuable services to wildlife and humanity. Conservation of these ecosystems requires development of rapid and large scale monitoring strategies, where remote sensing and Geographic Information Systems (GIS) can be advantageous. In this study, high spatial resolution Quickbird and IKONOS and medium spatial resolution Landsat and Aster images were used for monitoring the aquatic plants and water clarity in Lakes Mogan and Eymir. Classification of emergent plants with high spatial resolution data yielded overall accuracies greater than 90% for both lakes, while overall accuracies obtained from the medium spatial resolution data ranged between 80% and 93% for Lake Mogan and between 70% and 78% for Lake Eymir. It was found that there was 23ha reed bed loss in Lake Mogan between 2002 and 2005 and an additional 14ha was lost between 2005 and 2006. In Lake Eymir, no significant change in reed bed area was detected from high spatial resolution images; however medium spatial resolution images revealed 8ha of change which was attributed to the presence of mixed pixels due to low resolution. The overall accuracies for submerged plant coverage classification from Quickbird images in Lake Mogan were 83% (2005) and 79% (2006) and for classification of submerged plants species were 72% (2005) and 69% (2006). Moreover, it was found that blue band together with the ratio of red band to blue band, were the best predictors of Secchi disc depth.


Impact of water level fluctuations and fish on macroinvertebrate community and periphyton growth in shallow lakes - a mesocosm approach
Saraoğlu, Ece; Beklioğlu, Meryem; Department of Biology (2012)
A mesocosm experiment was conducted in Lake Eymir between June – September 2009 in order to elucidate the effects of water level changes and fish predation on periphyton growth and macroinvertebrates in semi-arid shallow lakes. Twenty four cylindrical enclosures, each with 1.2 m diameter, open to lake bottom and atmosphere, were placed at three different depths, i.e. 0.8 m (low water level, LW), 1.6 m (high water level, HW) and 2.3 m (however, data regarding the enclosures at 2.3 m were excluded in this stu...
Dissolved inorganic nitrogen removal efficiency of the reed beds surrounding lake Mogan using modeling approaches
Gökmen, Mustafa; Beklioğlu, Meryem; Department of Biology (2004)
In this study, yearly and seasonally nitrogen retention dynamics of reed beds surrounding Lake Mogan were investigated by comparing surface aerial nitrogen load and in-lake concentrations. The analyses were performed separately for nitrate-N, ammonium-N and dissolved inorganic nitrogen (sum of nitrate-N and ammonium-N) to reveal differences between them in terms of retention dynamics. 1998, 1999 and 2002 were relatively high-load years in terms of DIN-input to reed beds surrounding Lake Mogan, compared with...
Breeding success and reproductive behavior in a white stork (ciconia ciconia) colony in Ankara
Göcek, Çağrı; Bilgin, Cemal Can; Department of Biology (2006)
White Stork ( Ciconia ciconia, Linnaeus, 1758) is a summer visitor and passage migrant in Turkey. Although being widespread in summer near wetlands of Turkey, except for the eastern and western parts of the Black Sea Region, there has been no research on this species involving regular monitoring of nests. In this study, breeding success and survival of nestlings in a population in Kızılcahamam-Ankara as well as behavioral differences among nests and their probable consequences on breeding success were studi...
Restoration of a shallow Mediterranean Lake by biomanipulation complicated by drought
Beklioğlu, Meryem (Schweizerbart, 2008-01-01)
Whether fish biomanipulation is an efficient restoration technique in eutrophic warm sub/tropical lakes has been subject to recent debate. Our investigations undertaken in warm Lake Eymir, Turkey show that fish removal increased water clarity during a five-year period. Rapid re-colonisation of submerged plants, Potamogeton pectinatus and Ceratophyllum demersum, occurred. This recovery was achieved at higher total phosphorus (TP) levels than the suggested threshold for stability, probably owing to the nitrog...
Early to Mid-Holocene Lake level and temperature records from the terraces of Lake Sunnet in NW Turkey
OCAKOĞLU, FARUK; Kir, Osman; Yılmaz, İsmail Ömer; Acikalin, Sanem; Erayik, Celal; TUNOĞLU, CEMAL; Leroy, Suzanne A. G. (2013-01-01)
Lake Sunnet, a freshwater landslide-dammed lake in NW Anatolia, comprises a10 m thick widespread of Early-to-mid Holocene deltaic sediments. Paleo-environmental interpretation of these deposits coupled with a high-resolution data (18 yrs/sample) of stable O and C isotopes, magnetic susceptibility and total organic and carbonate contents, allows an understanding of the nature of the mid-Holocene climatic transition as well as the short duration extreme events in relatively humid NW Turkey. Detailed sedimento...
Citation Formats
Ö. K. Doğan, “Monitoring of water clarity, and submerged and emergent plant coverages in shallow lake wetlands using remote sensing techniques,” M.S. - Master of Science, Middle East Technical University, 2007.