Temperature-, Salinity-, and Size-Dependent Winter Mortality of Juvenile Blue Crabs (Callinectes sapidus)
Temperature-, Salinity-, and Size-Dependent Winter Mortality of Juvenile Blue Crabs (Callinectes sapidus)
复制标题
DOI：
10.1007/s12237-010-9277-2
复制
发表时间：
2010-05-01
影响因子：
2.7
通讯作者：
Miller, Thomas J.
中科院分区：
文献类型：
--
作者：
Bauer, Laurie J.;Miller, Thomas J.
在其范围内的中纬度地区，越冬死亡率可能在调节青蟹（Callinectes sapidus）种群中发挥重要作用。我们进行了一个为期121天的实验，估计冬季死亡率，使用现实的温度驯化期之前和实验期间的光照水平。采用2 × 2 × 2析因实验设计，研究了温度（3 ℃、5 ℃）、盐度（10、25）和沉积物（沉积物、无沉积物）对孵化场和野生源幼蟹（甲壳宽14-68 mm）存活率的影响。沉积物的存在并没有显着改变螃蟹的生存，而孵化器提出的螃蟹经历了显着较低的生存率比野生捕捞螃蟹。一个加速故障时间模型拟合的生存数据表明，死亡时间显着增加，温度，盐度和螃蟹的大小。这些结果表明，冬季生存不同的冬季严重程度，是空间动态的，小的青少年在冬季死亡的风险比大的青少年。
At midlatitudes within its range, overwintering mortality may play an important role in regulating blue crab (Callinectes sapidus) populations. We conducted a 121-day experiment to estimate winter mortality that used realistic temperature acclimation periods prior to and light levels during experiments. A 2x2x2 factorial experimental design was used to test for the effects of temperature (3 degrees C, 5 degrees C), salinity (10, 25), and sediment (sediment, no sediment) on the survival of juvenile crabs (14-68-mm carapace width) of both hatchery and wild origin. The presence of sediment did not significantly alter crab survival, while hatchery-raised crabs experienced significantly lower survivorship than wild-caught crabs. An accelerated failure time model fit to the survival data indicated that time to death increased significantly with increasing temperature, salinity, and crab size. These results suggest that winter survival varies with winter severity, is spatially dynamic, and that small juveniles are more at risk of dying over the winter than larger juveniles.