【摘要】 本文以泥蚶(Tegillarca granosa)为实验对象,研究不同大小个体在不同pH(6.5～9.5)静水水体中的清滤率、滤食率和吸收率。泥蚶共3组,分别为小规格、中规格和大规格,其壳长分别为9.12 mm、22.38 mm、32.35 mm。结果表明,在pH为8.5时,泥蚶清滤率由高到低依次为大规格、中规格、小规格;滤食率由高到低为中规格、大规格、小规格;吸收率由高到低为中规格、小规格、大规格。虽然大规格泥蚶有最高的清滤率,但结合吸收率和滤食率,中规格泥蚶具有更高的摄食和吸收能力。双因素方差分析显示,在清滤率、滤食率和吸收率的实验中,泥蚶受pH快速变化的影响程度均与其规格有关(P <0.05)。随pH变化,清滤率受影响程度由小到大为小规格(P <0.05)、中规格(参照)、大规格(P> 0.05);滤食率受影响程度由小到大为大规格(P> 0.05)、小规格(参照)、中规格(P <0.05);吸收率受影响程度由小到大为小规格(P> 0.05)、中规格(参照)、大规格(P <0.05)。中规格泥蚶的滤食水平受pH变化的影响较大,大规格泥蚶的吸收率受pH变化的影响较大。更多还原

【Abstract】 The effect of ocean acidification on shellfish was a long–term process, however, the water pH can be changed rapidly in aquaculture. Therefore, the study of physiological responses of shellfish in different sizes under different pH stress would be with significatively value in the aquaculture. In this study, we used the blood clam(Tegillarca granosa) with different sizes(9.12 mm, 22.38 mm and 32.35 mm) as a model to explore the effects of feeding physiology under different pH(6.5﹣9.5) stress(Table 1). Clearance rate,ingestion rate and absorption efficiency were determined in static bioassay tests, which were used to represent the feeding physiology of the mud clam. At pH = 8.5, the clearance rates from high to low were as follows: large > medium > small(Fig. 1); the ingestion rates from high to low were as follows: medium, large, small(Fig. 2); and the absorption efficiencies from high to low as follows: medium > small > large(Fig. 3). Although the large blood clam had the highest Clearance rate, the medium blood clam had higher ingestion and absorption capacity. The clearance rate, ingestion rate and absorption efficiency of blood clam were related to pH and its size(P < 0.05) by two–way ANOVA. The influence of pH on the clearance rates were as follows: small(P < 0.05) < medium(reference) < large(P > 0.05)(Fig. 1); the influence of ingestion rates were as follows: large(P > 0.05) < small(reference) < medium(P < 0.05)(Fig. 2); and the influence of absorption rates were as follows: small(P > 0.05) < medium(reference) < large(P < 0.05)(Fig. 3). The Ingestion rate of medium blood clam was greatly affected by the environmental pH, and the absorption efficiency of large blood clam was greatly affected by the environmental pH.更多还原