湄洲湾灵川贝类养殖滩涂小型底栖动物数量研究

Studies on the meiofauna number at the shellfish farming mudflat of Lingchuan in Meizhou Bay

2005年6月至2006年3月对湄洲湾北岸灵川贝类养殖滩涂的小型底栖动物进行研究,并探讨了贝类养殖对滩涂底栖环境可能造成的影响.结果表明:小型底栖动物的总平均密度为65.7±37.5个/cm2,春季(3月)的密度比其它季节高.线虫和桡足类是小型底栖动物密度的主要组成,其中线虫平均密度为63.9个/cm2,约占密度组成的97.3%;桡足类平均密度为0.77个/cm2,约占密度组成的1.2%.许多站次的线虫和桡足类数量之比(N/C)均超过100,多贝类养殖的Y断面的小型底栖动物密度、N/C均比寡贝类养殖的F断面高.

In this paper the meiofaunal status at Lingchuan shellfish farming mudflat of Meizhou Bay in 4 surveys from June 2005 to March 2006 was studied. Lingehuan was an important aquiculture base for Ruditapes philippinarum fanning in Fujian. It was found that average density of meiofauna reached 65.7 ± 37.5ind/cm^2 and there was significant difference in densities in March compared with other seasons. Nematode and copepod were important groups at the mudflat where Nematode accounted for 97.3% of the total while copepod accounts for 1.2%. Ratio of nematodes to copepods （N/C） was generally higher than 100. Meiofaunal density and N/C at section Y, where more oyster and Ruditapes philippinarum fanning was conducted, were higher than that at section F where there was fewer shellfish farming.