Year 2020, Volume 23 , Issue 6, Pages 1561 - 1568 2020-12-31

Assessment of Hg in Holothuria (Mertensiothuria) leucospilota (Brandt, 1835) from Karachi coasts, Pakistan
Pakistan Karachi sahillerinden Holothuria (Mertensiothuria) leucospilota türünde (Brandt, 1835) Hg değerlendirmesi

Quratulan AHMED [1] , Levent BAT [2]

The aim of the present study was to determine mercury levels in sediments, surface sea water and Holothuria leucospilota muscles and skin in two selected sites from Karachi coast. Samples were collected during two seasons south-west monsoon (August-September) and north-east monsoon (December-January). The concentrations of Hg in sediment ranged from 0.0012 to 0.0023 mg kg-1, and in surface water from 0.00018 to 0.00034 (µg l-1), while in muscle and skin of black sea cucumber ranged from LOD to 0.0034 and LOD to 0.0046 mg kg-1 dry wt., respectively. Moreover, Hg showed the highest accumulation rate in the skin tissue with BSAF values ranging between 2 in Buleji and 2.69 in Sunehri at north-east monsoon. The BSAF values in the muscles of the black sea cucumber ranged from 1.44 at south-west monsoon in Buleji to 1.63 at north-east monsoon in Sunehri, respectively. Since BSAF value is higher than 2 on the skin of sea cucumber, it is evaluated as macro-concentrator. However, the BSAF value varies between 1 and 2 in muscle, it has been determined as micro-concentrator. Hg in the black sea cucumbers from Buleji and Sunehri sites of the Karachi coasts is “very bio-accumulative” (BCF > 5000) during both sampling seasons.
Bu çalışmanın amacı, Karachi kıyısında seçilen iki bölgede sediment, yüzey deniz suyu ve Holothuria leucospilota kasları ve derisindeki cıva seviyelerini belirlemektir. Örnekler iki mevsim güney-batı musonu (Ağustos-Eylül) ve kuzey-doğu musonu (Aralık-Ocak) boyunca toplanmıştır. Sediment içindeki Hg konsantrasyonları kuru ağırlık olarak 0,0012 ila 0,0023 mg kg-1 ve yüzey suyunda 0,00018 ila 0,00034 (µg l-1) arasında değişirken, kara deniz hıyarının kas ve derisinde ise LOD değerleri 0,0034 - 0,0046 mg kg-1 arasında değişmektedir. Üstelik, Hg deri dokusunda en yüksek birikim oranını, kuzeydoğu musonunda Buleji'de 2 ile Sunehri'de 2,69 arasında değişen BSAF değerleri ile gösterilmiştir. Kara deniz hıyarı kaslarındaki BSAF değerleri, Buleji'de güneybatı musonda 1,44 ile Sunehri'nde kuzeydoğu musonda 1,63 arasında değişmektedir. Kara deniz hıyarının derisinde BSAF değeri 2'den yüksek olduğu için makro-yoğunlaştırıcı olarak değerlendirilmiştir. Bununla birlikte, BSAF değeri kasta 1 ile 2 arasında değiştiğinden, mikro-yoğunlaştırıcı olarak belirlenmiştir. Karachi kıyılarının Buleji ve Sunehri bölgelerindeki kara deniz hıyarlarında Hg, her iki örnekleme mevsimi boyunca biyo-birikime sahip olduğu görülmüştür (BCF> 5000). 
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Primary Language en
Subjects Agriculture

Orcid: 0000-0002-7597-2483
Author: Quratulan AHMED
Institution: The Marine Reference Collection and Resource Centre, University of Karachi,
Country: Pakistan

Orcid: 0000-0002-2289-6691
Author: Levent BAT (Primary Author)
Institution: Sinop Üniversitesi Su Ürünleri Fakültesi Su Ürünleri Temel Bilimler Bölümü
Country: Turkey


Application Date : April 7, 2020
Acceptance Date : May 21, 2020
Publication Date : December 31, 2020

APA Ahmed, Q , Bat, L . (2020). Assessment of Hg in Holothuria (Mertensiothuria) leucospilota (Brandt, 1835) from Karachi coasts, Pakistan . Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi , 23 (6) , 1561-1568 . DOI: 10.18016/