Forced Convection Effects on Gas Flux in Benthic Cnidarians

许多固着的海洋无脊椎动物依赖于 海水对流输送颗粒食物，溶解 营养和呼吸气体。 以前的工作与被动 悬浮进食的刺胞动物已经表明， 在生物体的边界层中是最重要的 粒子和气体通量的行列式。 质量理论 在对流分析中，传递没有得到充分利用 介导的气体通量在水生无脊椎动物。 我建议 研究流动如何调节交换过程中的几个 北方和温带刺胞动物物种通过实验 使用气体微电极，再循环流呼吸测定法， 细胞层生物类似物，加热的模式生物类似物，和 场形态测量学 本研究的目标包括：（1） 了解生物体大小、几何形状和 间距对舍伍德/雷诺数关系的影响，（2） 扩散边界层频率测量 真实的湍流中的限制和湍流增强效应 潮下带浅水潮滩中的水流（3）扩散试验 相似性模型作为理解异速生长的方案 刺胞动物的珊瑚虫几何形状;（4）调查 微电极扩散边界层成像 面积交换系数的生理学探讨 与动物结构和动量边界的关系 层. 这项气体交换研究的结果也将给 了解DOM的吸收情况和DOM监管的某些方面， 这对有兴趣估算 海洋生境的次级生产力。 这项工作将有 在污损生物群落、珊瑚礁研究中的应用 生态学和近岸底栖生物过程。

Many sessile marine invertebrates depend on forced convection of seawater to deliver particulate food, dissolved nutrients, and respiratory gases. Previous work with passive suspension feeding cnidarians has shown that the state of flow in the boundary layer over the organism is the most important determinant of particle and gas flux. The theory of mass transfer has been under-utilized in the analysis of convection mediated gas flux in aquatic invertebrates. I propose to investigate how flow modulates exchange processes in several species of boreal and temperate cnidarians through experiments using gas microelectrodes, recirculating flow respirometry, cell layer organism analogs, heated model organism analogs, and field morphometry. The goals of this study include: (1) an understanding of the effects of organism size, geometry, and spacing on the Sherwood/Reynolds number relationship, (2) measurement of the frequency of diffusional boundary layer limitation and turbulent enhancement effects in real turbulent flows in shallow subtidal hibitats (3) testing of diffusional similarity models as a scheme for understanding the allometry of polypal geometry in cnidarians, and (4) investigation of microelectrode diffusional boundary layer mapping as a physiological probe of areal exchange coefficients and their relationship with animal structure and the momentum boundary layer. The results of this gas exhanges study will also give insights into uptake of DOM and some aspects of osmoregulation, and will be useful to workers interested in estimating secondary productivity in marine habitats. This work will have application to the study of fouling communities, coral reef ecology, and near-shore benthic processes.