diatom microfossil; lake; monitoring; paleolimnological proxies; sediment core; Ecology, Evolution, Behavior and Systematics; Agronomy and Crop Science
Abstract :
[en] Paleolimnological assessment of Ladik Lake (N Turkey) using diatoms was carried out along a 62 cm-long sediment core recovered from the southeastern part of the lake. The chronology of the sediments was established by137Cs ‒210Pb dating. Accordingly, three major chronostratigraphical diatom assemblage zones (DAZ) were defined by the CONISS (constrained cluster analysis) program. The oldest assemblage, DAZ C (AD 1925-1958), was dominated by Ulnaria ulna (Nitzsch) Compère, Cocconeis placentula Ehrenb. and Cocconeis pediculus Ehrenb. taxon. In DAZ B (AD 1958-1986), in addition to Ulnaria ulna species that dominated through the whole core, Epithemia spp. occasionally dominated the assemblage in this zone. Ulnaria ulna and Pantocsekiella ocellata (Pant.) K.T. Kiss & Ács predominated since the beginning of DAZ A (AD 1986-2006). After the first regime of the lake with dystrophic character, the diatom community underwent a significant shift, with decreased abundance of periphytic diatom samples. The improvement of the regulator in 1986 resulted in a larger water level increase that affected the lake ecology, causing a shift from a diverse periphytic diatom to planktonic diatom assemblage. Based on our monitoring it can be inferred that the limnological regime shifts in Ladik Lake during the 20th century are of anthropogenic origin, rather than being due to climatic changes.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Maraşlioğlu, F.; Department of Biology, Faculty of Arts and Science, Hitit University, Çorum, Turkey
Soylu, E.N.; Department of Biology, Faculty of Arts and Science, Giresun University, Giresun, Turkey
Avşar, U.; Department of Geological Engineering, Middle East Technical University, Ankara, Turkey
Hubert, Aurelia ; Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Language :
English
Title :
A PALEOLIMNOLOGICAL APPROACH TO UNDERSTAND REGIME-SHIFT DYNAMICS IN LADIK LAKE (NORTH TURKEY)
Acknowledgements. This research was funded by the European Commission Marie Curie Excellence Grant Project “Understanding the irregularity of seismic cycles: A case study in Turkey” (MEXT-CT-2005-025617: Seismic Cycles), hosted by the Seismology Section of the Royal Observatory of Belgium.
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