MRI: Hatching Rhythms of Estuarine and Freshwater Grass Shrimps

本项目代表了幼虫释放节律的比较研究 以及影响米氏沙蚕卵孵化的环境因子 长臂虾属的虾。河口的草虾 展示不同的潮汐周期和淡水池塘/湖泊将是 用作试验微生物。>Palaemontes pugio>和>Palaemonetes paludosus> 将分别代表河口和淡水栖息地。的 该项目的主要目标是：1。来确定 两种生境草虾的孵化节律; 2.为了确定孵化的内源性控制的存在， 节奏和环境参数，他们夹带; 3. 建立控制内源性孵化节律的位点， 两种生境的草虾; 4.以确定是否存在， 任何阻碍卵孵化的化学线索的性质;以及 5.将孵化节律与当时的环境联系起来 两种生境的参数。这次调查的结果 代表了第一个比较的鸡蛋孵化节奏， 草虾从不同的栖息地，并将提供一个独特的 测试先前提出的幼虫释放模型的机会。的 项目将有助于我们了解的基本类型， 孵化节律和生态之间的相互关系， 成虾和孵化节律。

This project represents a comparative study of larval release rhythms and the environmental factors that control egg hatching in caridean shrimp of the genus, Palaemonetes. Grass shrimp from estuaries exhibiting different tidal cycles and a freshwater pond/lake will be used as test organisms. >Palaemontes pugio> and >Palaemonetes paludosus> will represent the estuarine and freshwater habitats, respectively. The major objectives of this project are: 1. to determine the type of hatching rhythms shown by grass shrimp species from the two habitats; 2. to ascertain the presence of endogenous control of the hatching rhythm and the environmental parameters to which they are entrained; 3. to establish the site(s) of control of endogenous hatching rhythms in grass shrimp from the two habitats; 4. to ascertain the presence and nature of any chemical cue that synchronizes the hatching of eggs; and 5. to correlate hatching rhythms with the prevailing environmental parameters in the two habitats. The results of this investigation will represent the first comparative account of egg hatching rhythms of grass shrimp from diverse habitats and will provide a unique opportunity for testing previously proposed larval release models. The project will contribute to our understanding of the basic types of hatching rhythms and the interrelationship between the ecology of adult shrimp and hatching rhythms.