摘要
光裸方格星虫（Sipunculus nudus）个体实验生态试验结果表明：在实验时间48h内，其温盐耐受范围为t=0～400C；S=6—57，最适温盐范围：t=16～34℃；S=21～42。当生境温盐因子处于最适阈值，温盐变化对星虫体不产生直接影响，虫体处于正常状态。耐受温盐范围分高低两段，低温盐段t=0-16℃；S=6～21，该段温盐变化与星虫体耐受力呈正相关系；高温盐段t=36—40℃；S=45—60，该段温盐变化与星虫耐受力呈负相关系。不论低温盐或高温盐段，随温盐变化，星虫体均表现出一系列生理非常态反应。当盐度32时，星虫体死亡高温临界值t=42℃；当温度为26℃，虫体临界低盐度S=3，临界高盐度S=60。温盐变化与星虫体生理反应和存活率之间关系的定性描述和量化界定，在其生态理论上和生产实践中均具有重要意义和指导作用。
The results of ecological experiments on adult Sipunculus nudus reveal that within 48hours, its tolerances of both temperature and salinity vary from 0 -40℃, 6-57 respectively. Its optimal tolerance ranges are t6 -34℃, 21 - 42 respectively. Fluctuations in both temperatures and salinities have no direct impact on the worm when two of them are in optimal threshold. Two ranges, high and low, for temperature and salinity tolerances are given, in which the Changes in low ones with t = 0-16℃, S = 6 -21 have positive relationship with the tolerances of this sipunculid worm, and variations of high ones with t = 36 - 40℃, S = 45 - 60 showing reverse relationship. In these two ranges, the worm is subject to variations in these two ranges, high or low, displaying abnormal physiological responses. High thermal threshold is 42℃ for the worm＇s mortality at a salinity of 32, and the high and low salinity thresholds are 60 and 3 respectively at a temperature of 26℃. Qualitative description and quantitative defi- nition of relationships between the changes in both temperature and salinity and physiological responses and survival rates of the worm have profound implications in terms of its ecological theory and production practice.
出处
《福建水产》
2008年第4期1-6,共6页
Journal of Fujian Fisheries
关键词
光裸方格星虫
成体
温盐
耐受性
Sipunculus nudus
Adult
Temperature and salinity
Tolerances
