Prato E, Biandolino F, Scardicchio C
CNR-Institute for Coastal Marine Environment, Section of Taranto, Taranto, Italy.
Environ Technol. 2008 Dec;29(12):1349-56. doi: 10.1080/09593330802379482.
This study explored the effect of temperature and salinity on the life cycle of Gammarus aequicauda in order to establish temperature and salinity ranges advantageous for chronic toxicity testing. A broad range of salinity-temperature conditions (salinities of 10, 20 and 36 per thousand, and temperatures of 10, 18 and 24 degrees C combined in nine different treatments) significantly influenced various reproductive aspects of G. aequicauda reared in the laboratory, from newly released juveniles to first brood production by mature adults. There was a significant linear regression between the brood size and the body size of the female. The number of juveniles released per female was highest at 10 degrees C and lowest at 24 degrees C. The temperature and salinity variations had a significant effect on the fecundity of G. aequicauda. A high temperature led to a faster individual growth and a quicker sexual development than a lower temperature. A temperature acceptable for chronic toxicity tests can be 18 degrees C, at which an acceleration of the life cycle without a lowering of the amphipod's performance was observed. Regarding salinity, results from this study showed that salinities down to 36 per thousand may also be used in sediment toxicity tests with G. aequicauda, so providing a proper and gradual acclimation.
本研究探讨了温度和盐度对平尾钩虾生命周期的影响，以便确定有利于慢性毒性试验的温度和盐度范围。一系列广泛的盐度 - 温度条件（盐度分别为千分之10、20和36，温度分别为10、18和24摄氏度，组合成九种不同处理）显著影响了在实验室中饲养的平尾钩虾从新孵化的幼体到成熟成体首次产卵的各个生殖方面。雌虾的产卵量与体长之间存在显著的线性回归关系。每只雌虾释放的幼体数量在10摄氏度时最高，在24摄氏度时最低。温度和盐度变化对平尾钩虾的繁殖力有显著影响。高温导致个体生长比低温更快，性发育也更快。慢性毒性试验可接受的温度为18摄氏度，在此温度下观察到生命周期加速，而没有降低端足类动物的性能。关于盐度，本研究结果表明，低至千分之36的盐度也可用于平尾钩虾的沉积物毒性试验，前提是提供适当且逐步的驯化。
