Toxicity and removal of zinc in the three species (Acutodesmus obliquus, Desmodesmus subspicatus and Desmodesmus armatus) belonging to the family, Scenedesmaceae (Chlorophyta)

Bu çalışmada; üç yeşil mikroalg türü, Acutodesmus obliquus (Turpin) Hegewald ve Hanagata, Desmodesmus subspicatus (Chodat) Hegewald ve Schmidt and Desmodesmus armatus (Chodat) Hegewald,’nün gelişimi üzerine çinkonun etkisi ve bu yeşil alglerin çinkoyu uzaklaştırması araştırıldı. Mikroalg hücrelerinin gelişiminin engellenmesi, 5 başlangıç çinko derişimine maruz bırakılarak belirlendi. Alglerin gelişimi, artan çinko derişimi ile azaldı. $EC_{50}$ değerleri, D. subspicatus, A. obliquus ve D. armatus’da sırasıyla 2257,824, 1922,049 ve 1634,275 Zn μg $L^{-1}$ olarak belirlendi. Ortamdan en yüksek çinko uzaklaştırma yüzdesi, D. subspicatus (%40)’ta belirlendi ve bunu sırasıyla A. obliquus (%30) ve D. armatus (%18)’un izlediği saptandı. Scenedesmus’ta fenotipik plastisiti, değişen çevre koşullarına tepki olarak bildirilmektedir. Fenotipik plastisiti, A. obliquus ve D. armatus’da test edilen tüm çinko derişimlerinde belirlendi.

Anahtar Kelimeler:

türler, toksisite, Chlorophyta, çinko

Scenedesmaceae (Chlorophyta) familyasına ait üç türde (Acutodesmus obliquus, Desmodesmus subspicatus ve Desmodesmus armatus) çinkonun toksisitesi ve uzaklaştırılması

In this study, the effects of zinc upon growth of three green microalgal species, Acutodesmus obliquus (Turpin) Hegewald and Hanagata, Desmodesmus subspicatus (Chodat) Hegewald and Schmidt and Desmodesmus armatus (Chodat) Hegewald, and the capability of these green algae for removal of zinc were investigated. Growth inhibition of the microalgal cells was determined following exposure for 96 h to five initial concentrations of zinc. The growth of the alga decreased with increasing zinc concentrations. $EC_{50}$ values were determined as 2257.824, 1922.049 and 1634.275 μg $L^{-1}$ for Zn in the case of D. subspicatus, A. obliquus and D. armatus, respectively. The highest zinc removal percentage from media was determined in D. subspicatus (40%), and followed by A. obliquus (30%) and D. armatus (18%). Phenotypic plasticity in Scenedesmus has been documented in response to a wide variety of conditions. The phenotypic plasticity was observed in A. obliquus and D. armatus in all tested zinc treatments.

Keywords:

species, toxicity, Chlorophyta, zinc,

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