THE INFLUENCE OF MICROALGAE SPECIES AND CONCENTRATIONS ON THE PHYSIOLOGICAL METABOLISM,CARBON AND NITROGEN BUDGET OF THE GREEN-LIPPED MUSSEL(PERNA VIRIDIS)
To explore the effects of microalgal species and their concentration on the physiological metabolism,carbon and nitrogen balance of Perna viridis,three microalgal species(Isochrysis galbana,Chaetoceros meülleri and Platymonas subcordiformis)at three food concentrations(2.2,4.4 and 6.6 mg/L,dry weight)were measured under laboratory conditions.The feeding rate,respiration rate,excretion rate,fecal production rate,and calcification rate of P.viridis were measured under the interaction of these food types and concentrations.Furthermore,the carbon and nitrogen balances of P.viridis were also calculated based on these data.Research results indicated that the feeding rate of the P.viridis was not significantly influenced by the microalgal species,but it increased significantly with the concentration of the microalgae.The respiration rate and excretion rate were affected by microalgal species,and a significant interaction was found between the type and concentration of feed.Under high microalgal concentration conditions,the respiration rate of the C.meülleri group was higher than that of the I.galbana and P.subcordiformis groups.The microalgal species and concentrations significantly affected the defecation rate of the P.viridis.The defecation rate in the C.meülleri treatment group was higher than that in the other two microalgal groups when P.viridis fed with the same concentration.As for the same microalgae,the defecation rate increased with their concentration.The calcification rate of the P.viridis was not significantly affected by the microalgal species and concentration.As carbon budget of P.viridis,the fecal carbon and growth carbon accounted for 78.37％～96.22％of the total ingested carbon.The proportion of growth carbon in each group increased with microalgal concentration;higher values(71.75％～74.49％)were observed in higher microalgal concentrations(4.4 and 6.6 mg/L)of I.galbana and C.muelleri.In nitrogen budget,the growth nitrogen of I.galbana and P.subcordiformis groups increased with increasing of microalgal concentration,while the opposite trend was found in excreted nitrogen.Under low microalgal concentration,the growth and fecal nitrogen were the highest in the C.meülleri group,while its excreted nitrogen was the lowest.
Perna viridismicroalgal speciesfood concentrationcarbon and nitrogen budget
万方数据
维普
