Research on the filtration rate of main oysters and the water purification function of restored oyster reefs in Jiantiao Bay,Sanmen County
Oyster reefs are important coastal habitats,and they have various ecosystem functions,but their area has declined by about 85％due to overfishing,environmental pollution and other reasons.To understand the water purification function of Jiantiao Bay oyster reefs in Sanmen County,the types,proportions and the filtration rate of oysters[Crassostrea ariakiensis(CA),C.hongkongensis(CH),and C.sikamea(CS)]in the reefs were analyzed,the effects of temperature and specifications on oyster filtration rate were explored,and the filtration of artificially restored oyster reefs were estimated.This study measured the filtration rates of three types of oysters with different individual sizes(large,medium,small)and under different water temperatures(10 ℃,20℃,25℃,30 ℃).The research results indicated that individual size had a significant impact on the filtration rate of CA,CH,and CS(P＜0.05):CS and CA had the maximum filtration rates at small size,which were(6.94±2.64)L·g-1·h-1 and(0.87±0.23)L·g-1·h-1,respectively;CH reached the maximum filtration rate of(1.83±1.07)L·g-1·h-1 at medium size.In the large and small size experimental groups,the order of filtration rate was:C.sikamea＞C.ariakiensis=C.hongkongensis(P＜0.05);in the medium size experimental group,the order of filtration rate was:C.sikamea=C.hongkongensis＞C.ariakiensis(P＜0.05).Results from two-way ANOVA demonstrated that species significantly affected the filtration rate of oysters,while sizes also had influence on the filtration rate of oysters.The water temperature had a significant impact on the filtration rate of CS(P＜0.05),reaching the maximum filtration rate(2.48+1.62)L·g·h-1 at 20℃.The water temperature did not have a significant effect on the filtration rate of CA and CH(P＞0.05).At water temperatures of 10℃,20 ℃,and 25℃,the order of filtration rate was:C.sikamea＞C.ariakiensis=C.hongkongensis(P＜0.05);at a water temperature of 30℃,the order of filtration rate was:C.sikamea＞C.ariakiensis＞C.hongkongensis(P＜0.05).C.hongkongensis and C.sikamea were the dominant species in reef bodies in 2019 and 2020,respectively.The filtration rate per unit area of the reefs restored in 2019 and 2020 were(249.59±81.80),(268.66±123.80)L·h-1·m-2,respectively.The filtration rate of oyster reefs restored in 2019 and 2020 reached 16 613.02 L·h-1 and 26 016.56 L·h-1 in Sanmen County,Zhejiang Province.The research results indicate that the restoration of oyster reefs in Sanmen County has strong water filtration function,and it can provide data support for future restoration work of oyster reefs.
oyster reefsfiltration rateindividual sizetemperaturewater purification function
万方数据
维普
