Bentho-Pelagic Coupling on the West Antarctic Peninsula Shelf: The Impact and Fate of Bloom Material at the Seafloor

西南极半岛陆架的底栖-中上层耦合：海底水华物质的影响和命运

• 批准号: 9815823
• 负责人: Craig Smith
• 金额: $ 31.65万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-15 至 2002-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9815823&HistoricalAwards=false
• 关键词: Bentho; Pelagic; Coupling; West; Antarctic

OPP98-15823 P.I. Craig SmithOPP98-16049 P.I. David DeMasterPrimary production in Antarctic coastal waters is highly seasonal, yielding an intense pulse of biogenic particles to the continental shelf floor. This seasonal pulse may have major ramifications for carbon cycling, benthic ecology and material burial on the west Antarctic Peninsula (WAP) shelf. Thus, we propose a multii-disciplinary program to evaluate the seafloor accumulation, fate and benthic community impacts of bloom material along a transect of three stations crossing the Antarctic shelf in the Palmer LTER study area. Using a seasonal series of five cruises to our transect, we will test the following hypostheses: (1) A substantial proportion of spring/summer export production is deposited ont eh WAP shelf as phytodetritus or fecal pellets. (2) The deposited bloom production is a source of labile particulate organic carbon for benthos for an extended period of time (months). (3) Large amounts of labile bloom POC are rapidly subducted into the sediment column by the deposit-feeding and caching activities of benthos. (4) Macrobenthic detritivores sustain a rapid increase in biomass and abundance following the spring/summer particulate organic carbon pulse. To test these hypotheses, we will evaluate seabed deposition and lability of particulate organic carbon, patterns of particulate organic carbon mixing into sediments, seasonal variations in macrofaunal and megafaunal abundance, biomass and reproductive condition, and rates of particulate organic carbon and silica mineralization and accumulation in the seabed. Fluxes of biogenic materials and radionuclides into midwater particle traps will be contrasted with seabed deposition and burial rates to establish water-column and seabed preservation efficiencies for these materials. The project will substantially improve our understanding of the spring/summer production pulse on the WAP shelf and its impacts on seafloor communities and carbon cycling in Antarctic coastal systems.

OPP98-15823 P.I. Craig SmithOpp98-16049 P.I.南极沿海水域中的David Demaster -Prarimary生产是高度季节性的，在大陆架地面产生了强烈的生物颗粒脉冲。 这种季节性脉搏可能在南极半岛（WAP）架子上对碳循环，底栖生态和物质埋葬有重大影响。 因此，我们提出了一项多学科计划，以评估沿着帕尔默·莱特研究区中三个横穿南极货架的三个站的横断面，沿着三个站点的横断面评估海底的积累，命运和底栖界的影响。 使用季节性系列的五次巡航到我们的横断面，我们将测试以下输血：（1）将很大一部分春季/夏季出口的产量沉积在EH WAP架子上作为植物植物或粪便颗粒。 （2）沉积的花朵产生是长时间（月份）的底栖动物不稳定的颗粒有机碳的来源。 （3）大量不稳定的花POC通过底栖生物的沉积喂养和缓存活动迅速俯冲到沉积物柱中。 （4）春季/夏季颗粒有机碳脉冲之后，大叶叶灭绝病的生物量和丰度迅速增加。 为了检验这些假设，我们将评估颗粒有机碳的海床沉积和不稳定性，颗粒有机碳混合的模式成沉积物中的模式，大面积和巨型丰度的季节性变化，生物量和生物量和生殖状况以及颗粒有机碳和硅化矿物质矿物质和硅化矿物质的速率。 生物材料和放射性核素进入中水颗粒陷阱的通量将与海床沉积和埋葬率形成鲜明对比，以建立这些材料的水柱和海床保护效率。 该项目将大大提高我们对WAP架子上春季/夏季生产脉冲的理解及其对南极沿海系统中海底社区和碳循环的影响。