JGOFS: Carbon Flow Through The Microbial Loop in the Arabian Sea: Heterotrophic Nanoplankton Growth Rates and Picoplankton Grazing

JGOFS：阿拉伯海微生物循环中的碳流：异养纳米浮游生物生长率和超微型浮游生物放牧

• 批准号: 9310693
• 负责人: David Caron
• 金额: $ 31万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-11-15 至 1999-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9310693&HistoricalAwards=false
• 关键词: JGOFS; Carbon; Flow; Through; Microbial

9310693 Caron Pico-sized organisms (organisms 0.2 - 2.0um) constitute a very significant portion of the production and living biomass of oceanic plankton communities. Primary production by photosynthetic microorganisms in these size classes (cyanobacteria, prochlorophytes, some small eukaryotic algae) are major contributors to total primary production in the plankton. Likewise, recent evidence suggests that bacteria may be the largest single repository of living biomass in many pelagic ecosystems. Collectively, the activities and fates of these assemblages strongly influence the flow of energy and biologically reactive elements in the ocean. Because these assemblages are generally smaller than the particles captured efficiently by metazoan zooplankton, the repackaging of these microorganisms into larger consumers is a fundamental step for their incorporation into pelagic food webs. Protistan consumers in the nanoplankton size range (largely flagellated protozoa ~20 um in size) play a pivotal role in plankton communities as the primary consumers of picoplankton assemblages (both bacteria and phototrophs). Yet, there is still little information on the rates of consumption of bacteria and small phytoplankton in oceanic environments, or on the growth and production rates of protistan consumers. As a part of the U.S. Joint Global Ocean Flux Study in the Arabian Sea, Dr. Caron will perform experiments to investigate the grazing rates and production of nanoplanktonic consumers from the surface waters and O2 minimum layer of this oceanic environment. The overall goal in this work is to quantify carbon flow through the first trophic interaction in the microbial plankton.

小行星9310693 皮级生物（0.2 - 2.0微米的生物）构成海洋浮游生物群落的生产和生活生物量的非常重要的部分。 这些大小级别的光合微生物（蓝细菌、原绿藻、一些小型真核藻类）的初级生产是浮游生物总初级生产的主要贡献者。 同样，最近的证据表明，细菌可能是许多海洋生态系统中最大的单一生物量储存库。 总的来说，这些组合的活动和命运强烈地影响着海洋中能量和生物活性元素的流动。 由于这些组合通常小于后生浮游动物有效捕获的颗粒，这些微生物重新包装成更大的消费者是一个基本步骤，为他们纳入远洋食物网。 在微型浮游生物大小范围内的原生生物消费者（主要是尺寸约20 μ m的有鞭毛原生动物）在浮游生物群落中发挥着关键作用，作为微型浮游生物组合（细菌和光养生物）的主要消费者。 然而，关于海洋环境中细菌和小型浮游植物的消耗率或原生生物消费者的生长和生产率的信息仍然很少。 作为美国在阿拉伯海的联合全球海洋通量研究的一部分，Caron博士将进行实验，以调查来自该海洋环境的表面沃茨和O2最小层的纳米浮游生物消费者的放牧率和生产。 这项工作的总体目标是通过浮游微生物中的第一营养相互作用来量化碳流。