Effects Of Physiological Activities Of Mytilus Coruscus On Carbon Cycle In The Offshore

With the increasingly prominent global climate and environmental problems such as global warming and ocean acidification,people's demand for solving the negative impacts of these climate and environmental changes is more and more urgent.As an important part of the global carbon cycle,it is very important to understand the biogeochemical process of marine carbon cycle.Because of complex hydrology and frequent human production and life,the process of carbon cycle in offshore waters is complex and changeable.The development of the coastal aquaculture industry has made the high intensity biological processes have a profound impact on the carbon cycle in the offshore area.Therefore,it is of great significance to understand the role of cultured organisms in the carbon cycle of the coastal waters and to understand the carbon cycle in the offshore areas.In this regard,the Zhejiang's main economic shellfish-mussel?Mytilus coruscus?as the research object,the basicity?Alkalinity anomaly technique?anomaly detection techniques,determination of Mytilus coruscus in different salinity and temperature,seawater acidification conditions coruscus calcification rate and respiratory rate were analyzed on coruscus the effect of coastal carbon cycling.The results are as follows:1.The respiration rate and calcification rate of mussels were affected by the change of salinity.With the increase of salinity,the change trend of coruscus calcification rate and respiratory rate increases first and then decreases,the calcification rate was 25‰in salinity reached the maximum of 0.36±0.03?mol/?FWg·H?;respiration rate with changes in salinity showed a single peak trend,which reached the maximum in 30‰salinity,3.83±0.38?mol/?FWg·H?.2.The respiration rate and calcification rate of mussels were significantly affected by temperature,and all increased with the increase of temperature.The calcification rate and respiratory rate reached the maximum at 25 degrees,and their values were 0.28±0.04mol/?FWg·H?,1.64±0.10 mol/?FWg·H?,and the lowest values at 5?were 0.04±0.02mol/?FWg·H?,0.52±0.08(mol/.At 5?and 10?,the respiration and metabolism of mussels will be inhibited,which affects the growth and development of mussels.Seasonal changes in sea water temperature will increase the CO₂ amount of mussels in summer and fall due to respiration and action.In the future,the warming of the sea water will lead to the increase of the CO₂ intensity released by the thick shell mussels through calcification and respiration,which will affect the carbon cycle in the coastal waters.3.The calcification rate of mussels is obviously influenced by the acidification of the sea.When pH is 7.5,the calcification rate is close to 0,and when pH is 7,the calcification rate is negative.It is shown that the calcification of mussels will be severely inhibited in the continuous acidification of the ocean in the future,and may be faced with the risk of failure to produce shells.When pH is 7 and 7.5,the respiratory and metabolic functions of Mytilus edulis are inhibited,and energy metabolism mainly consumes protein,which will seriously affect the growth and development of Mytilus edulis,and will increase the mortality of Mytilus edulis.4.According to the analysis of water quality in the sea area of mussels of East polar mussel,it is found that the calcification rate and respiration rate are relatively high in summer because of high temperature,low salt and high pH in the sea water,which has strong calcification and strong influence on the carbon cycle in the coastal waters.In spring and winter it is mainly affected by sea water temperature,calcification and respiratory metabolism are weakened.It has little effect on the carbon cycle in the coastal waters.