Collaborative Research: Estuarine Crab Transport: Linking Post-Settlement Dispersal, Bio-Physical Mechanisms and Hydrodynamic Corridors

合作研究：河口螃蟹运输：将定居后扩散、生物物理机制和水动力走廊联系起来

• 批准号: 0221099
• 负责人: Richard Forward
• 金额: $ 6.45万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2006-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0221099&HistoricalAwards=false
• 关键词: Collaborative; Research; Estuarine; Crab; Transport

Secondary pelagic dispersal of juvenile benthic organisms following initial larval settlement may strongly influence local and regional population dynamics, yet secondary dispersal is rarely considered in recruitment studies. While the relative importance of post-settlement blue crab dispersal in determining recruitment patterns in Pamlico Sound, NC, is presently recognized, the factors initiating movement by early juvenile blue crabs away from settlement habitats, the mechanisms mediating across-sound transport, and the population-level consequences of redistribution to alternative habitats, have not yet been explored. This project will address these issues through an interdisciplinary study that incorporates: (1) small-scale field measurements in seagrass beds along the sound-side of the Outer Banks to identify the factors cueing initial movement from settlement habitats, (2) laboratory experiments to test the behavioral mechanisms that drive pelagic emigration, and (3) sound-wide hydrographic surveys to characterize Pamlico Sound circulation coupled with synoptic measurements of the spatiotemporal distribution of postlarval and juvenile blue crabs. The project will be conducted during 2002-2003 to take advantage of concurrent postlarval and juvenile sampling supported by another NSF award. This project will contribute to the understanding of how pelagic dispersal occurs in estuaries that are not dominated by tidal motions, but by irregular or persistent wind-induced motions. Generalizations of recruitment dynamics from past work on systems with strong tidal signals (e.g., Chesapeake and Delaware Bays) may not accurately characterize patterns of estuarine recruitment in predominantly large, wind-driven systems such as Pamlico Sound.

底栖生物幼崽在初始幼虫定居后的次生远洋扩散可能会强烈影响当地和区域种群动态，但在招募研究中很少考虑次生扩散。虽然目前已经认识到定居后蓝蟹扩散在决定北卡罗来纳州帕姆利科湾（Pamlico Sound）的新生境的相对重要性，但尚未探索早期幼年蓝蟹离开定居栖息地的运动因素、跨声运输的中介机制以及重新分配到替代栖息地的种群水平后果。本项目将通过跨学科研究解决这些问题，其中包括：(1)通过外滩滨海侧海草床的小规模野外测量，确定了从定居栖息地迁移的初始因素；(2)通过实验室实验，测试了驱动远洋迁徙的行为机制；(3)通过全声水文调查，表征了Pamlico声环流，并结合了对青蟹幼虫和幼蟹时空分布的天气测量。该项目将在2002-2003年期间进行，利用由另一项NSF奖励支持的同时进行的幼虫和幼鱼抽样。这个项目将有助于理解在不受潮汐运动支配，而是由不规则或持续的风引起的运动支配的河口中，远洋扩散是如何发生的。过去对具有强潮汐信号的系统（如切萨皮克湾和特拉华湾）的研究总结出的招募动态可能不能准确地描述像帕姆利科湾这样主要由风力驱动的大型系统的河口招募模式。