Tsai M L, Dai C F, Chen H C
Institution of Oceanography, National Taiwan University, Taipei.
Comp Biochem Physiol A Mol Integr Physiol. 1998 Jan;119(1):361-7. doi: 10.1016/s1095-6433(97)00438-8.
The ability to resist desiccation stress was examined in two semiterrestrial Ligia species, Ligia exotica Roux and L. taiwanensis Lee, in Taiwan, under a certain desiccation condition. L. exotica exhibited the longer survival time, lower weight-specific rates of water loss, and the slightly higher ability of tolerance to water loss, compared to L. taiwanensis. In each species, the animal size displays a positive correlation to the survival time and total ability to resist desiccation, yet this size effects on the weight-specific water loss rate is negative. Neither water content nor maximum tolerance to water loss shows the association with the animal size in both species. The path ways and magnitudes of the interactions between these traits of desiccation resistance are analyzed and diagrammed using a stepwise regression model. In this model, the body sizes of animal can explain the most part of the variations in the survival time. The body size has a direct effect and an indirect effect, through the effect on water loss rate, on the time that the experimental animals can survival under this desiccated condition. These results suggest that L. exotica attains larger size than does L. taiwanensis, a lower transpiration rate and, consequently, a greater ability in desiccation resistance. The performances of these interactions in the desiccated resistance are more advantageous for L. exotica to migrate and colonize in variable land habitats within a certain limit, and as a result that L. exotica shows a broader distribution pattern than did L. taiwanensis in Taiwan.
在一定的干燥条件下，对台湾的两种半陆生海蟑螂物种，即奇异海蟑螂（Ligia exotica Roux）和台湾海蟑螂（L. taiwanensis Lee）的抗干燥胁迫能力进行了研究。与台湾海蟑螂相比，奇异海蟑螂表现出更长的存活时间、更低的单位体重失水率以及略高的耐失水能力。在每个物种中，动物体型与存活时间和抗干燥总能力呈正相关，但这种体型对单位体重失水率的影响为负。在这两个物种中，含水量和最大耐失水能力均与动物体型无关。使用逐步回归模型分析并绘制了这些抗干燥性状之间相互作用的途径和程度。在该模型中，动物的体型可以解释存活时间变化的大部分原因。体型对实验动物在这种干燥条件下能够存活的时间有直接影响和间接影响，间接影响是通过对失水率的影响实现的。这些结果表明，奇异海蟑螂的体型比台湾海蟑螂大，蒸腾速率更低，因此具有更强的抗干燥能力。这些抗干燥相互作用的表现对奇异海蟑螂在一定范围内的可变陆地栖息地中迁移和定殖更为有利，结果是奇异海蟑螂在台湾的分布模式比台湾海蟑螂更广泛。
