title: [Self-pollution in Ruditapes philippinarum bottom-cultured area of Zhuanghe coast].
abstract: By using sediment trap and closed respirator, a year-round in situ investigation was made on the bio-deposition rate, ammonia excretion rate, and phosphate excretion rate in the Ruditapes philippinarum bottom-cultured area of Zhuanghe coast. The three test rates of R. philippinarum all showed obvious seasonal variability, with the bio-deposition rate ranged in 0.15-1.47 g x ind(-1) x d(-1) (annual average 0.61 g x ind(-1) x d(-1)), ammonia excretion rate ranged in 0.02-0.40 mg x ind(-1) x d(-1) (annual average 0.17 mg x ind(-1) x d(-1)), and phosphate excretion rate ranged in 0.01-0.39 mg x ind(-1) x d(-1)(annual average 0. 13 mg x ind(-1) x d(-1)). Based on these, it was estimated that the annual bio-deposit production by the bottom-cultured R. philippinarum in Zhuanghe coast could reach as high as 5.46 x 10(7) t dry mass, amounting to 9.07 x 10(6) t organic matter (OM), 1.00 x 10(6) t organic carbon (OC), or 1.18 x 10(5) t organic nitrogen (ON), and the annual NH4+ -N and PO4(3-)-P productions were 1.49 x 10(4) t and 1.15 x 10(4) t, respectively. Our results suggested that for the large scale and high density bivalve culture in China coasts, the potential impacts of self-pollutants by filter-feeding bivalves on the environment should not be neglected.
authors.affiliation: National Marine Environmental Monitoring Center, Dalian 116023, Liaoning, China. xtyuan@nmemc.gov.cn
authors.forename: Xiu-tang
authors.initials: XT
authors.lastname: Yuan
authors.forename: Sheng-li
authors.initials: SL
authors.lastname: Zhang
authors.forename: Shu-xi
authors.initials: SX
authors.lastname: Liu
authors.forename: Bin
authors.initials: B
authors.lastname: Liang
authors.forename: Yu-bo
authors.initials: YB
authors.lastname: Liang
authors.forename: Guo-fan
authors.initials: GF
authors.lastname: Zhang
mesh_terms: D000818:Animals; D017756:Aquaculture; D049872:Bivalvia / Q000254:growth & development* / Q000378:metabolism; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D010710:Phosphates / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012623:Seawater; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010710:Phosphates; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical