Reza RAHNAMA, Arash JAVANSHİR, Ali MASHİNCHİAN

The effect of lead bioaccumulation on condition indices of zebra mussel (Dreissena polymorpha) from anzali wetland-caspian sea

Bu çalışmada zebra midyesinin (Dreissena polymorpha) yumuşak dokusunda kurşun birikiminin, midyenin kondüsyonuna etkileri araştırılmıştır. Çalışmalar, kondüsyon indislerinin (TCI ve SCI) kontrol grupları ve kurşun muamelesi görmüş midyeler arasında önemli bir fark olmadığını göstermiştir. Midyelerin kondüsyon indisleri deney süresince azalmıştır. Bunun nedeni de metal birikimi değil zaman fonksiyonudur. Metal kirliliğinin dışında, gıda temini gibi diğer çevresel faktörler de midyelerin kondüsyonunu etkileyebilir. Biz deneyimizde gıda temini faktörünü hem kontrol grubuna hem de muamele grubuna aynı gıdayı sağlayarak bertaraf ettik. Bundan dolayı, kurşun, midyenin kondüsyon indisine etki eden temel faktör olmuştur. Kurşun birikimi sadece midyelerin yumuşak dokusunda gözlemlenmiştir. Her muameledeki ve muameleler arasındaki zamana dayalı önemli farklar incelenmiştir. Sonuçlarımız midyelerin yumuşak dokularındaki kurşun birkiminin maruz kalma zamanından ve çevreleyen su ortamındaki kurşun konsantrasyonundan etkilendiğini göstermiştir. Her muamelede en uzun maruz kalma süresinde (15 gün) en yüksek birikme seviyesi ile en kısa maruz kalma süresinde (5 gün) en düşük birikme seviyesi incelenmiştir. Ayrıca muameleler arasında midyelerin yumuşak dokusunda biriken en yüksek kurşun seviyesi (455 μg ${ L-^1}$) ile en düşük seviyesi (2 μg ${ L-^1}$) incelenmiştir.

Anahtar Kelimeler:

toksik maddeler, kurşun, çevresel faktörler, ağır metaller, kirlilik, toksikoloji, maruz kalma, midye

Anzali-hazar denizindeki zebra midyesine (Dreissena polymorpha) kurşun biyoakümülasyonunun etkileri

In this study the effect of lead on condition indices of zebra mussel (Dreissena polymorpha) together with the accumulation of lead in the soft tissue of mussels, were investigated. Studies showed no significant differences in condition indices (TCI and SCI) among the mussels in control and lead treatments. Mussels condition indices decreased during the experimental period, that it caused by function of time, not by metal accumulation. Besides the metal pollution, other environmental factors, such as food availability, could affect the mussel's condition. In our experiment we removed the effect of food by providing same food availability for mussels in control and lead treatments during the experiment. Therefore lead is the main effective factor on mussel's condition indices. Lead accumulation only observed in the soft tissue of mussels. Significant differences in lead accumulation in each treatment (based on time) and among treatments were observed. Our results suggest that the accumulation of lead in the soft tissue of mussels was affected by exposure time and lead concentration in the ambient water. In each treatment highest accumulation at longest exposure time (15 days) and lowest accumulation at shortest exposure time (5 days) were observed. Besides, among treatments, most accumulation of lead in the soft tissue of mussels at concentration of (455 μg ${ L-^1}$) and lowest accumulation were observed at concentration of (2 μg ${ L-^1}$.

Keywords:

toxic substances, lead, environmental factors, heavy metals, pollution, toxicology, exposure, mussels,

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