Collaborative Proposal: Cross-Shelf Transport and Post-Bloom New Production Near the Pribilof Islands

合作提案：普里比洛夫群岛附近的跨货架运输和花后新生产

• 批准号: 0323150
• 负责人: Suzanne Strom
• 金额: $ 16.3万
• 依托单位: Western Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0323150&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Cross; Shelf; Transport

The proposed study will test the hypothesis that on-shelf flow of nutrient- and zooplankton-rich slope water influences post-spring-bloom new production and zooplankton populations in the vicinity of the Pribilof Islands, thereby enhancing the region's ability to support juvenile fish and planktivorous seabirds. The project will investigate on-shelf transport of slope water, which supplies nutrients that sustain new primary production in summer, a season when the availability of new production on the shelf is limited by stratification. A second hypothesis is that this new production will be dominated by diatoms rather than by flagellates, and a diatom-based food web will result in meso-zooplankton with a greater energy content than meso-zooplankton in a flagellate-based food web. These energy-rich zooplankton are expected to be of greater value to juvenile fish and planktivorous seabirds than those that have fed upon less lipid-rich phytoplankton. The project will also test these hypotheses during July/August cruises in 2004 to 2007. During these cruises, the PIs will compare production and its fate in an area on the middle shelf where summer-time cross-shelf advection is weak (Mooring 2), on the middle shelf in an area of episodic advection but little vertical mixing (Mooring 4) and at the Pribilof Islands where there is both on-shelf transport and tidal mixing of nutrients into the upper mixed layer. The project will measure along- and across-shelf flows (Stabeno, PMEL), nutrient concentrations (Mordy, UW/PMEL), standing stocks of phytoplankton (Zeeman, U. New England), new, regenerated and total production (Zeeman, Sambrotto, Lamont-Doherty), the grazing rates of micro-zooplankton in relation to phytoplankton standing stocks and production (Strom, Western Washington University), zooplankton biomass and composition (Coyle, U. Alaska, Fairbanks), lipid content, fatty-acid composition, and stable isotope signatures of zooplankton, juvenile fish and seabirds (Napp, NMFS), and the foraging distributions and food habits of marine birds (Hunt, U. California, Irvine). In addition, the project will use satellite-tracked drifters and moorings to measure currents. This proposal is the first in the Bering Sea to address the effect of on-shelf fluxes of nutrient-rich slope water on post-spring-bloom new production, and in turn, how this new production affects the abundance and quality of prey for juvenile fish (i.e., age-0 walleye pollock) and planktivorous seabirds. Post-bloom new production may be particularly important for providing high quality prey at a time when juvenile fish are developing the reserves to carry them through the winter and seabirds are feeding growing young. The work focuses on a region of great economic and societal importance, and examines the ecological processes that affect the productivity of Pribilof Islands' waters and their ability to support juvenile fish, and the seabirds and marine mammals that depend on them. The most abundant fish in the area are juvenile walleye pollock, the target of the world's largest single-species fishery. The information generated by the proposed research will be of value in assessing the mechanisms whereby global climate change can affect the amount of post- spring bloom new production and the nutritional quality of prey available to upper trophic levels. The project will include undergraduate, graduate and post-doctoral students in the field and in the laboratory for the analysis and workup of the data and will strive to develop outreach programs with the school systems on St Paul and St. George Islands. The work will be disseminated in the refereed literature and through web sites.

拟议的研究将检验以下假设：富含养分和浮游坡水的营养和浮游水流会影响新的生产后新生产和浮游生物岛附近的浮游生物种群，从而增强了该地区支持幼虫鱼和浮游生物的能力。该项目将调查坡水的架子上运输，该坡水在夏季提供新的初级生产的营养，这个季节是货架上新生产的可用性受分层的限制。第二个假设是，这一新产量将由硅藻而不是鞭毛，而基于硅藻的食物网将导致比中基于鞭毛的食物网中具有更大能量含量的中索斯兰克顿。预计这些能量丰富的浮游动物对少年鱼和木板鸟类的价值比在较少脂肪富含脂质的浮游植物上的海鸟具有更大的价值。 The project will also test these hypotheses during July/August cruises in 2004 to 2007. During these cruises, the PIs will compare production and its fate in an area on the middle shelf where summer-time cross-shelf advection is weak (Mooring 2), on the middle shelf in an area of​​ episodic advection but little vertical mixing (Mooring 4) and at the Pribilof Islands where there is both on-shelf transport and tidal mixing of nutrients into the upper混合层。 The project will measure along- and across-shelf flows (Stabeno, PMEL), nutrient concentrations (Mordy, UW/PMEL), standing stocks of phytoplankton (Zeeman, U. New England), new, regenerated and total production (Zeeman, Sambrotto, Lamont-Doherty), the grazing rates of micro-zooplankton in relation to phytoplankton standing stocks and production （西部华盛顿大学Strom），浮游生物生物量和成分（Coyle，U.Alaska，Fairbanks），脂质含量，脂肪酸成分以及浮游生物的稳定同位素签名，幼虫鱼和海鸟（Napp，NMF，NMFS），以及觅食鸟类（Hund of Marine and Marine and Marine and Cackation）。此外，该项目将使用卫星跟踪的漂移器和系泊器来测量电流。该提案是白令海第一个解决富含养分的坡水对弹簧后灌木后新生产的影响的影响，反过来，这种新产量如何影响幼鱼（即Age-0 Walleye Pollock）和planktivoroctovorovoreorsebirds的幼年猎物的丰度和质量。盛开后的新生产对于在少年鱼开发储备金以将它们带入冬季而海鸟正在喂食年轻的时候，新生产对于提供高质量的猎物尤为重要。这项工作着重于一个极为经济和社会重要性的地区，并研究了影响pribilof群岛水域生产力及其支持少年鱼的能力的生态过程，以及依赖于它们的海鸟和海洋哺乳动物。该地区最丰富的鱼是少年角色pollock，这是世界上最大的单物种渔业的目标。拟议的研究产生的信息将具有评估全球气候变化的机制，可以影响春季开花后的新产量和可用于上营养水平的猎物的营养质量。该项目将包括该领域的本科，研究生和博士后学生，以及实验室的数据分析和工作，并将努力与圣保罗和圣乔治群岛的学校系统一起开发外展计划。这项工作将在被裁判的文献和网站中传播。