盐度对内刺盘管虫受精、孵化及幼虫存活、变态的影响

Effects of salinity on fertility,hatching rate,survival,and metamorphosis in Hydroides ezoensis larvae

研究了不同盐度(20、25、30、32、35、40)对污损生物优势种内刺盘管虫Hydroides ezoensis受精、孵化及幼虫存活、变态的影响。结果表明:在试验盐度范围内,内刺盘管虫精卵在不同盐度的海水中都有较高的受精率,其中盐度为35的组精卵的受精率最高(96.67%±1.76%),而盐度为20的组受精率最低(82.23%±1.85%),且显著低于其余各组(P<0.05);盐度对内刺盘管虫的孵化率影响较大,其中盐度为32的组受精卵的孵化率最高(85.68%±1.20%),而盐度为20的组孵化率最低(62.03%±3.78%),且显著低于其余各组(P<0.05);盐度对内刺盘管虫的存活率和变态率影响更大,幼虫的存活率和变态率在盐度为25～35时均较好,盐度为32的组幼虫的存活率和变态率均最高(72.14%±3.04%和63.45%±2.13%),盐度为40的组幼虫的存活率和变态率均最低(10.82%±1.76%和5.21%±1.40%),且显著低于除盐度为20的其余各组(P<0.05)。本研究表明,内刺盘管虫的受精、孵化及幼虫存活、变态的适盐范围均为30～35,最佳受精盐度为35,最佳孵化、存活、变态的盐度均为32。

The effects of various salinities （20,25,30,32,35, and 40） on fertility, hatching rate, survival, and metamorphosis were studied in predominant fouling organism Hydroides ezoensis larvae. It was found that there was high fertility in the eggs exposed to the salinities in the experiment, the maximal fertility（96.67% ±1.76% ） at a salinity of 35, and the minimum（82.23% ±1.85% ） at a salinity of 20, significantly lower than that at other salinities（P〈 0.05）. The hatching rate was affected by the salinity, the maximal hatching rate（ 85.68% ±1.20% ） at a salinity of 32 and the minimal （62.03% ±3.78% ） at a salinity of 20, significantly lower than that at other salinifies（ P〈0.05 ）. The hatching rate was affected by the salinity, the maximal hatching rate （85.68 % ± 1.20% ） at a salinity of 32 and the minimal （62.03% ±3.78% ） at a salinity of 20, significantly lower than that at other salinities（ P〈0.05 ）. The higher survival and metamorphic rates were found at a salinity from 25 to 35, the maximum （72.14% ±3.04% in survival rate and 63.45% ±2.13% in metamorphic rate） at a salinity of 32, and the minimum （ 10.82%±1.76%, and 5.21% ±1.40% ） at a salinity of 40, significantly lower than that at other salinities （ P〈0.05 ）, except at a salinity of 20. The findings indicate that the adaptive salinity is varied from 30 to 35 for fertility, hatching rate, survival, and metamorphosis in Hydroides ezoensis larvae, 35 for the maximal fertility, and 32 for the maximal hatching, survival, and metamorphic rates.