Assessing the chemical speciation and bioavailability of iron regenerated by marine zooplankton

评估海洋浮游动物再生铁的化学形态和生物利用度

基本信息

批准号：
1061545
负责人：
Benjamin Twining
金额：
$ 51.93万
依托单位：
Bigelow Laboratory for Ocean Sciences
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2011
资助国家：
美国
起止时间：
2011-04-01 至 2014-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1061545&HistoricalAwards=false
关键词：
Assessing chemical speciation bioavailability iron

项目摘要

Iron (Fe) is a required, but often limiting nutrient, in the upper ocean. Sources of Fe include external inputs, as well an in situ regeneration due to the rapid recycling of Fe in surface waters through biological uptake and regeneration, including via zooplankton grazing. Digestion of phytoplankton biomass in zooplankton guts is expected to result in chemical redox and speciation changes which will affect Fe bioavailability, but this recycling process remains understudied. The current project will examine this topic through a series of laboratory and field investigations which will probe the consequences of grazing on chemical speciation and bioavailability. The studies will investigate the pH and redox state in the digestive vacuole/guts of different zooplankton, and examine how prey ? grazer dynamics influences the speciation of regenerated Fe, and its bioavailability to cultures of model phytoplankton. Field experiments will also examine Fe regeneration, speciation and bioavailability using natural prey - grazer assemblages from coastal and open ocean waters during cruises funded through other programs. The project will educate and train students and scientists at the high school, undergraduate and post-doctoral levels at institutions in Maine, and through programs at the Bigelow Marine Lab. Undergraduates will be involved in studies through the Bigelow REU program. Overall, the project will provide important information on the sources and pathways of iron uptake into marine microbes and the factors influencing bioavailability in marine waters by focusing on one aspect of this important research area.

铁（Fe）是上海上需要的，但通常会限制营养。 FE的来源包括外部输入，以及由于通过生物学摄取和再生在地表水中快速回收FE，包括通过浮游植物放牧，是一种原位再生。浮游生物中浮游植物生物量的消化预计将导致化学氧化还原和物种形成变化，这将影响Fe生物利用度，但这种回收过程仍在研究中。当前的项目将通过一系列实验室和现场调查来检查该主题，这些研究将探讨放牧对化学物种形成和生物利用度的后果。这些研究将研究不同浮游动物的消化液泡/胆量中的pH和氧化还原状态，并检查猎物的猎物？ Grazer动力学影响了再生Fe的物种及其对模型浮游植物培养物的生物利用度。现场实验还将在通过其他计划资助的巡航过程中使用天然猎物的FE再生，物种形成和生物利用度。该项目将在缅因州机构的高中，本科生和博士后教育和培训学生和科学家，并通过Bigelow Marine Lab的计划进行教育。本科生将通过Bigelow REU计划参与研究。总体而言，该项目将通过关注这一重要研究领域的一个方面来提供有关铁吸收海洋微生物的来源和途径的重要信息。