Sains Malaysiana 40(10)(2011): 1075–1085

Gill and Digestive Caecum of Telescopium telescopium as Biomonitors of Pb Bioavailability and Contamination by Pb in the Tropical Intertidal Area

(Insang dan Secum Pencernaan Telescopium telescopium sebagai Penunjuk Biologi bagi Ketersediaan dan Pencemaran Pb di Kawasan Pasang Surut Tropika)

C. K. Yap* & A. Noorhaidah

Department of Biology, Faculty of Science, Universiti Putra Malaysia

43400 UPM, Serdang, Selangor, Malaysia

Received: 9 June 2010/Accepted: 22 December 2010

ABSTRACT

In this paper we investigated the concentrations of Pb in seven different soft tissues (foot, cephalic tentacles, mantle, muscle, gill, digestive caecum and remaining soft tissues) of 17 geographical populations of Telescopium telescopium collected from the intertidal area of Peninsular Malaysia. Two points can be presented based on the present study. First, as expected, different concentrations of Pb were found in the different soft tissues, indicating different mechanisms of bioaccumulation and regulations of Pb in these different tissues. By comparing the Pb concentrations in the similar tissues, spatial variation of Pb was found in the different sampling sites although there is no consistent pattern of Pb contamination in these sampling sites. Second, based on the correlation coefficients and multiple linear stepwise regression analysis between Pb concentrations in the different soft tissues and Pb concentrations in geochemical factions in the surface sediments, it is found that gill and digestive caecum can truly reflect Pb contamination and Pb bioavailabilities in the tropical intertidal mudflats. To our knowledge, this is the most comprehensive study on Pb in the different soft tissues of T. telescopium, in relation to the habitat sediments of the snails.

Keywords: Different soft tissues; Pb distribution; Telescopium telescopium

ABSTRAK

Kertas ini melaporkan kajian mengenai kepekatan Pb di dalam tujuh bahagian tisu lembut (kaki, tentakel sefalon, mantel, otot, insang, secum pencernaan dan tinggalan tisu lembut) bagi 17 populasi geografi Telescopium telescopium yang disampel dari kawasan pasang surut di Semenanjung Malaysia. Terdapat dua perkara boleh dikemukakan berdasarkan kajian ini. Pertama, seperti yang dijangkakan, kepekatan Pb yang berlainan diperoleh dalam pelbagai tisu lembut, menunjukkan mekanisme biopenimbunan dan regulasi bagi Pb yang berlainan dalam pelbagai tisu ini. Dengan membandingkan kepekatan Pb pada tisu yang sama, variasi secara tempat bagi Pb diperoleh di kawasan pensampelan yang berlainan walaupun tiada pola yang tekal bagi pencemaran Pb di kawasan pensampelan tersebut. Kedua, berdasarkan korelasi koefisen dan pelbagai analisis regresi linear peringkat demi peringkat di antara kepekatan Pb di dalam tisu lembut yang berlainan dan kepekatan Pb di fraksi geokimia di permukaan sedimen, didapati insang dan secum pencernaan boleh menunjukkan pencemaran Pb dan Pb ketersediaan di tempat pensampelan pasang surut berlumpur. Pada pengetahuan kami, ini adalah kajian yang paling lengkap bagi Pb di tisu lembut berlainan di T. telescopium yang berkaitan dengan sedimen habitat bagi siput ini.

Kata kunci: Taburan Pb; tisu lembut berlainan; Telescopium telescopium

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*Corresponding author; email: yapckong@hotmail.com