中华哲水蚤卵密度及其沉降速率(英文)

Egg density and sinking rate of a planktonic copepod Calanus sinicus (Copepoda: Calanoida)

中华哲水蚤是中国全球海洋生态系统动力学（China-GLOBEC）研究中的关键次级生产者，是浮游植物与高营养级生物之间的中间纽带。为了阐明中华哲水蚤的卵沉降动力学，采用密度梯度离心法研究了中华哲水蚤的卵密度，研究结果表明：在厦门湾中华哲水蚤平均卵密度为1．0733gcm^-3。按照斯托克斯定律，中华哲水蚤卵的沉降速率为43．9～67．5md^-1。对中华哲水蚤卵沉降时间与孵化时间的比较表明，在厦门湾中华哲水蚤卵能够在孵化之前就沉降到海底。并对中华哲水蚤卵快速沉降的生态学意义展开了讨论。

Calanus sinicus is regarded as one of the key levels, in the China-GLOBEC Project. The density and understand the depositional dynamics of eggs. The egg secondary producers, linking phytoplankton and higher trophic sinking rate of Calanus sinicus eggs were studied in order to density of C. sinicus was determined by the density-gradient centrifugation with sucrose solution. The mean density of C. sinicus eggs was 1.0733 g cm^-3 with a SD of 0.0087 g cm^-3 in Xiamen Bay from December 2002 to May 2003. Based on Stokes＇ Law, the values of sinking rate for Calanus sinicus eggs were estimated, ranging from 43.9 to 67.5 m d^-1. The comparison of the egg deposition time and egg hatching time suggested that in most cases virtually all eggs of C. sinicus would settle to the bottom before their hatching in Xiamen Bay even though the eggs have high potential to hatch. The ecological significance of fast settlement of C. sinicus eggs was discussed.