MRI: Hatching Rhythms of Estuarine and Freshwater Grass Shrimps

MRI：河口和淡水草虾的孵化节奏

• 批准号: 9012637
• 负责人: Jonathan Wilson
• 金额: $ 20.99万
• 依托单位: Jackson State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9012637&HistoricalAwards=false
• 关键词: MRI; Hatching; Rhythms; Estuarine; Freshwater

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.

本项目对Palaemonetes caridean虾的幼虫释放节律和控制卵孵化的环境因素进行了比较研究。来自不同潮汐周期的河口和淡水池塘/湖泊的草虾将被用作试验生物。>Palaemonetes pugio>和>Palaemonetes paludosus>分别代表河口和淡水生境。本项目的主要目标是：1。确定两种生境草虾的孵化节律类型；2. 确定存在内源性控制的孵化节奏和它们所受的环境参数；3. 建立两个生境草虾内源孵化节律控制位点；4. 确定任何与卵同步孵化的化学线索的存在和性质；和 5。将孵化节奏与两个栖息地的主要环境参数联系起来。这项调查的结果将代表不同栖息地草虾卵孵化节律的第一个比较说明，并将为测试先前提出的幼虫释放模型提供一个独特的机会。该项目将有助于我们了解孵化节奏的基本类型以及成虾生态与孵化节奏之间的相互关系。