Effects of extreme changes of sea water temperature and salinity on the development of the sand dollar Scaphechinus mirabilis
Effects of extreme changes of sea water temperature and salinity on the development of the sand dollar Scaphechinus mirabilis
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DOI：
10.1134/s1063074009050083
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发表时间：
2009-09-01
影响因子：
0.6
通讯作者：
Kashenko, S. D.
中科院分区：
文献类型：
--
作者：
Kashenko, S. D.
本文研究了14、17、20、22和25 ℃的温度和36- 12 ℃的盐度对沙元Scaphechinus mirabilis胚胎和幼虫的综合影响。胚胎发育是中华绒螯蟹早期个体发育中最敏感的阶段。奇迹它是在14- 20摄氏度的温度下完成的，盐度范围为36- 24摄氏度，温度为22摄氏度至26摄氏度。施肥在较宽的温度和盐度范围内进行。在游泳幼虫中，囊胚对这些环境因素的变化表现出最大的抵抗力。在水温14- 22 ℃、盐度36- 20 ℃的条件下，全部成活，其中70%以上的成活率在18 ℃的条件下。pluteus I是最脆弱的阶段;这可能与幼虫骨架的形成和向浮游植物摄食的过渡有关。20日龄仔鱼在14- 22 ℃、36- 24 ℃盐度条件下存活率为100%，在14- 20 ℃、18 ℃盐度条件下存活率最高。25 A ℃对S.奇迹在20 ℃、32.2- 32.6 ℃盐度条件下，该种的发育历期为28.5-29天。在20和22 A摄氏度，幼虫解决和完成变态更快，如果从父母的栖息地的沙子是存在的。幼虫在14 A摄氏度和没有沙子的实验期间（14天）没有沉降。
The combined effects of temperatures of 14, 17, 20, 22, and 25A degrees C and salinities of 36-12aEuro degrees on embryos and larvae of the sand dollar Scaphechinus mirabilis was studied. Embryonic development is the most sensitive stage in the early ontogenesis of S. mirabilis. It is completed at a temperature of 14-20A degrees C in a salinity range of 36-24aEuro degrees and at temperature of 22A degrees C to 26aEuro degrees. The fertilization proceeds in wider ranges of temperature and salinity. Among the swimming larvae, blastulae showed the greatest resistance to variations of these environmental factors. All the larvae survived at a temperature of 14-22A degrees C and a salinity of 36-20aEuro degrees, and more than 70% of them at 18aEuro degrees. The pluteus I is the most vulnerable stage; probably this is related to the formation of the larval skeleton and transition to phytoplankton feeding. The survival of larvae at the age of 20 days was 100% at 14-22A degrees C and a salinity of 36-24aEuro degrees, most of them survived at 14-20A degrees C and a salinity 18aEuro degrees. The temperature 25 A degrees C is the most damaging for early development of S. mirabilis. The duration of development of that species lasts 28.5-29 days at 20A degrees C and a salinity of 32.2-32.6aEuro degrees. At 20 and 22A degrees C, the larvae settled and completed metamorphosis more quickly if sand from the parental habitat was present. The larvae did not settle during the experiment (14 days) at 14 A degrees C and in the absence of sand.