SGER: Viral Dynamics and the Southern Ocean Fe-cycle

铁的生物利用度已被证明在高营养低叶绿素（HNLC）海洋环境中调节初级生产。在HNLC系统中，超过99%的溶解铁是有机络合的，这些铁配体络合物（至少间接地）代表了海洋浮游生物可利用的铁池。然而，海水中铁结合配体的性质和来源尚不清楚。最近的研究表明，在与浮游植物群落生长一致的时间框架内，自然发生的病毒群体的活动提供了足够的有机络合铁来再生在HNLC沿海上升流系统中测量的溶解铁浓度。这项SGER提案的目标是参与即将进行的（2003年1月至2月）FeCycle分析，并（与奥塔哥大学（新西兰）和特拉华大学的科学家合作）确定病毒将铁再循环回海洋微生物群落的速度。在南纬46度30度，东经178度30度附近进行的为期12天的实验将建立在该地区4年的研究基础上。该项目的总体目标是收集信息，以便在没有铁施肥的情况下，为该系统中铁的循环建立初步模型。

The bioavailability of Fe has been shown to regulate primary production in high nutrient low chlorophyll (HNLC) marine environments. More than 99% of dissolved iron in HNLC systems is organically-complexed, and these Fe-ligand complexes represent (at least indirectly) the pool of Fe that is bioavailable to marine plankton. However, the character and source of the Fe-binding ligands in seawater are unknown. Recent research has suggested that the activity of naturally occurring viral populations provides sufficient organically complexed-Fe to regenerate the concentrations of dissolved Fe measured in a HNLC coastal upwelling system in a time frame consistent with the growth of the phytoplankton community. The goal of this SGER proposal is to participate in the upcoming (January February 2003) FeCycle analysis and (in collaboration with scientists from the University of Otago (NZ) and the University of Delaware) to determine the rate at which viruses recycle Fe back to the marine microbial community. A 12-day experiment in the vicinity of 46 degrees 30 degrees S, 178 degrees 30 degrees E will build on 4 years of research in this region. The overall objective of the project is to collect information that will allow for the development of a preliminary model for the cycling of Fe in this system in the absence of Fe fertilization.