| Meretrix meretrix is one of the most important economic shellfish in coastal culture in our country.In this paper,7 key parameters for the dynamic energy budget(DEB)growth model of M.meretrix were obtained through the combination of laboratory physiological and ecological experiments and field investigations by taking the M.meretrix in rudong area of Jiangsu province as the research object.On that basis,STELLA software was used to build the DEB growth model for M.meretrix,simulate the dry weigth growth of the soft part and quantify the distribution of energy in the whole life cycle.The main results as followed:(1)The shape coefficient ?m is 0.374.The Arrhenius temperature is calculated by the deformation formula of the Van't Hoff equation.Linear regression of the logarithm(LnR)of oxygen consumption per unit dry weight and the reciprocal of thermodynamic temperature(K)of water temperature in groups A,B and C,the results showed:A:y=-5211.39T-1+17.60(R2=0.6252);B:y=-6034.98T-1+20.61(R2=0.7340);C:y=-6301.57 7T-1+21.38(R2=0.7076).The absolute value of the slope was Arrenius temperature TA.Estimated Arrhenius temperature was(5849.31±328.11)K.After the starvation experiment until the 45th day,the oxygen consumption rate of M.meretrix declined by about 89%and remained constant when the value was about 0.70 mg·g-1 DW`h-1.[PM][EG]and[EM],were estimated to be 28.35 J·cm-3·d-1,5682.84 J·cm-3,2549.32 J·cm-3,respectively.At 25?,the feeding rate of M.meretrix was increased and then decreased.The maximum feeding rate was 7.50 mg POM·g-1·h-1 at a concentration of 12.00 mg POM·L-1 approximately.In the light of the dry weight and shell length datas of the soft body and combined with the absorption efficiency,{PAm} and{JXm} were estimated to be 120.84 J·cm-2·d-1 and 87.00 J·cm-2·d-1 respectively at the optimum temperature(2)According to the simulation results,the dry tissue weight of M.meretrix raised from 0.11g to 0.48g,and the shell length increased from 1.51 cm to 3.12 cm during more than one year from June 2018 and June 2019.The fasted growing of dry tissue weight of M.meretrix occurred during the phase from July 2018 to October 2018,and also during the phase from May 2019 to June 2019.In contrast,slowly growth was observed during the phase from December 2018 to February 2019.The energy partition among resreves(E),biovolume(Ev)and reproduction(ER).was quantitatively determined.Initially,the percentage of E,Ev,ER was 66%,34%and 0%respectively.The reserve decreased significantly with time from the beginning to 300 d and the lowest percentage was 7%at 300 d.After that,the reserve rose again and the percentage was 21%at 360d.The biovolume percentage was more than 60%during most of simulation phase and the reproduction percentage increased from 0 to 17%when the simulation ended(3)The simulation results of growth had significantly correlated with the field data(R2=0.96P<0.01).The correlation coefficient(r),root mean square(RMSE)and normalized root mean square error(NRMSE)values of the simulated and observed values were 0.9661,0.0285 and 5.35%,respectivelyThe sensitivity analysis was conducted in order to get good stability of the model The sensitivity index of maximum surface area-specific assimilation rate {PAm} was highest at 0.91%.Followed by the volume-specific costs for structure[EG]at 0.46%.The Structural body at puberty was smallest at 0.01%.The sensitivity index was less than 100%when the parameters were changed by 10%(4)The limiting role of water temperature and the concentration of chlorophyll a in the model was also analyzed.The results showed the DEB growth model had good stability and confirmed that diet was the limiting factor during the first 180 days,and then seawater temperature was limiting factor during the phase from 180 d to 300 dIn sunmmary,the DEB growth model can well simulate the growth of dry tissue weight and provide datas for the future construction of the ecological breeding capacity prediction model of M.meretrix in shallow sea and intertidal areas. |
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