Settlement cues in an Atlantic coast population of the ghost shrimp Callichirus major (Crustacea: Decapoda: Thalassinidea)
Settlement cues in an Atlantic coast population of the ghost shrimp Callichirus major (Crustacea: Decapoda: Thalassinidea)
复制标题
大西洋沿岸鬼虾 Callichirus Major 种群的定居线索（甲壳纲：十足目：Thalassinidea）
DOI：
10.3354/meps183217
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
D. Felder
中科院分区：
文献类型：
--
作者：
K. M. Strasser;D. Felder
在幼鱼达到最后一个带状阶段（ZIV）、十足目阶段（D）和第一个幼鱼阶段（J1）时，首先给予刺激。为动物提供沙子和未经调节的水，通过先前暴露于成年人的水调节（成年人调节水= AW），或两种刺激，以确定这些因素是否可以作为解决线索。ZIV被认为在解决过程中很重要。在ZIV接受沙子和AW的动物比在D接受刺激的动物打洞更多。而大西洋人口的幼虫延迟蜕皮D在没有刺激的情况下，他们这样做不同于以前发现的墨西哥湾人口。在海湾地区的人口，ZIV的持续时间减少AW的存在。与此相反，在大西洋人口的ZIV的持续时间显着增加，在这个阶段的刺激的存在下，这导致幼虫蜕皮直接从ZIV到D。在ZIV接受刺激的动物中，从ZIV直接蜕皮至D（绕过第五个带状阶段）的动物百分比显著高于在此阶段未接受刺激的动物。当每个刺激单独提供的结果是不等同于那些当刺激组合提供。大西洋人口需要存在的两个刺激在ZIV的解决，而暴露的ZIV幼虫单独的沙子是足以诱导解决的幼虫在海湾人口。
Larvae of Callichirus major (Say) were first given stimuli upon reaching the last zoeal stage (ZIV), decapodid stage (D), or first juvenile stage (J1). Animals were provided with sand and unconditioned water, water conditioned by previous exposure to adults (adult-conditioned water = AW), or both stimuli to determine if these factors could serve as settlement cues. ZIV was found to be important in the settlement process. Animals that received sand and AW at ZIV burrowed more than those that received stimuli at D. Whereas larvae of the Atlantic population delayed molting to D in the absence of stimuli, they did so differently than previously found in a Gulf of Mexico population. In the Gulf population, duration of ZIV decreased in the presence of AW. In contrast, duration of ZIV in the Atlantic population increased significantly in the presence of stimuli at this stage, which led larvae to molt directly from ZIV to D. The percentage of animals molting directly from ZIV to D (bypassing the fifth zoeal stage) was significantly higher in animals that received stimuli at ZIV than it was in animals that did not receive stimuli at this stage. When each stimulus was offered alone results were not equivalent to those when stimuli were offered in combination. The Atlantic population required presence of both stimuli at ZIV for settlement, while exposure of ZIV larvae to sand alone was sufficient to induce settlement of postlarvae in the Gulf population.