The snails(Pomacea insularum) were collected from polluted and unpolluted sites at Juru River and the Universiti Putra Malaysia Lake,respectively.Besides the shells,the soft tissues of snails were dissected into 6 dif...The snails(Pomacea insularum) were collected from polluted and unpolluted sites at Juru River and the Universiti Putra Malaysia Lake,respectively.Besides the shells,the soft tissues of snails were dissected into 6 different parts: intestine,operculum,foot,pennial sac,lung sac and the remainder.They were analyzed for the concentrations of Cu,Cd,Zn,Pb,Ni and Fe.The present study found 6 interesting points.First,all the metal levels found in the different parts of P.insularum collected from Juru River were significantly(p<0.05) higher than those in the snails of unpolluted lake.These results were also supported by the sediment data in which the Juru River sediment had significantly(p<0.05) higher levels of metal than those in the unpolluted lake.Second,the high levels of Cd and Pb were found in the shell of P.insularum,indicating that it is a potential biomonitoring material for these metals.Third,intestine accumulated elevated levels of Zn,Ni and Fe and thus is a potential biomonitoring organ for the 3 metals.Fourth,high levels of Cu were found in the lung sac and this phenomenon could be related to this metal binding to metallothionein in this organ.Fifth,elevated level of Pb found in the soft tissues of P.insularum indicated that this snail is not suitable for human consumption since its pollution level was higher than the food safety guideline for Pb.Sixth,there was no significant difference(p>0.05) between the different sizes(small sizes: 30.5-33.2 mm;large sizes: 37.7-40.4 mm) of P.insularum.The first 5 points supported the use of different soft tissues of P.insularum as biomonitoring organs of heavy metal pollution in the freshwater ecosystem in Malaysia although further validation is required.展开更多
基金the financial support provided through the Research University Grant Scheme(RUGS)(Vote No.:91229)Universiti Putra Malaysia and e-Science Fund(VoteNo.:5450338)the Ministry of Science,Technology and Innovation,Malaysia
文摘The snails(Pomacea insularum) were collected from polluted and unpolluted sites at Juru River and the Universiti Putra Malaysia Lake,respectively.Besides the shells,the soft tissues of snails were dissected into 6 different parts: intestine,operculum,foot,pennial sac,lung sac and the remainder.They were analyzed for the concentrations of Cu,Cd,Zn,Pb,Ni and Fe.The present study found 6 interesting points.First,all the metal levels found in the different parts of P.insularum collected from Juru River were significantly(p<0.05) higher than those in the snails of unpolluted lake.These results were also supported by the sediment data in which the Juru River sediment had significantly(p<0.05) higher levels of metal than those in the unpolluted lake.Second,the high levels of Cd and Pb were found in the shell of P.insularum,indicating that it is a potential biomonitoring material for these metals.Third,intestine accumulated elevated levels of Zn,Ni and Fe and thus is a potential biomonitoring organ for the 3 metals.Fourth,high levels of Cu were found in the lung sac and this phenomenon could be related to this metal binding to metallothionein in this organ.Fifth,elevated level of Pb found in the soft tissues of P.insularum indicated that this snail is not suitable for human consumption since its pollution level was higher than the food safety guideline for Pb.Sixth,there was no significant difference(p>0.05) between the different sizes(small sizes: 30.5-33.2 mm;large sizes: 37.7-40.4 mm) of P.insularum.The first 5 points supported the use of different soft tissues of P.insularum as biomonitoring organs of heavy metal pollution in the freshwater ecosystem in Malaysia although further validation is required.
