Physical-Biological Interactions Controlling Larval Krill Development and Early Survival: Implications for Population Recruitment and Demography of Euphausia Superba Dana

控制磷虾幼体发育和早期生存的物理生物相互作用：对磷虾种群招募和人口统计学的影响

• 批准号: 9525803
• 负责人: Peter Franks
• 金额: $ 17.22万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-10-01 至 1999-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9525803&HistoricalAwards=false
• 关键词: Physical; Biological; Interactions; Controlling; Larval

9525803 Franks This project will investigate how spatial and temporal variability in physical-biological features affects the development, condition and survival of Antarctic krill larvae (Euphausia superba). It is believed that adult spawning behavior and regional differences in primary productivity and temperature are significant forces controlling krill mortality, population demography and recruitment. Using a modified stage-structured larval population model, the effects of spawning behavior and variations in stage durations and mortalities on demography and recruitment will be examined. The model results will be compared with observed larval distributions to determine which processes best account for the observed population structures. Using a detailed metabolic model with stage structure and realistic external forcing, we will determine how much of the variability in stage durations and mortalities can be explained by the effects of food availability and temperature. Larval lipid metabolism will be incorporated into the model for elucidating the influences of physical and biological variability on larval krill condition. Models will integrate the effects of multiple parameters and will intimately coupled to field observations and laboratory experiments. This study will provided a valuable contribution to the understanding of interactions between marine populations and physical processes in the Southern Ocean ecosystem. The results from this study will be applicable to concurrent research investigating the physical-biological interactions affecting Euphausia superba in the Southern Ocean, and Euphausia pacifica in the California current. The ultimate intent is to quantify the impact of physical-biological patchiness associated with physical features and phenomena on larval condition, demography and recruitment in euphausiid populations. Understanding species' responses to physical perturbations will elucidate how environments have evolutionarily constrained life- history patterns to maximize survival in inherently patchy and variable systems. Through this understanding, this study will provide insights into the potential effects of climatic change on euphausiid populations and their ecosystems.

9525803 Franks该项目将调查物理生物学特征的空间和时间变化如何影响南极磷虾幼虫（Euphausia superba）的发育，状况和生存。 据认为，成年产卵行为和初级生产力和温度的区域差异是控制磷虾死亡率，人口统计和招聘的重要力量。 使用修改后的阶段结构的幼虫种群模型，产卵行为和阶段持续时间和死亡率的变化对人口和招聘的影响将被检查。 模型结果将与观察到的幼虫分布进行比较，以确定哪些过程最能解释观察到的种群结构。 使用一个详细的代谢模型与阶段结构和现实的外部强迫，我们将确定有多少阶段持续时间和死亡率的变化可以解释的食物供应和温度的影响。 幼体脂质代谢将被纳入模型，以阐明物理和生物变异对幼体磷虾条件的影响。 模型将整合多个参数的影响，并将密切耦合到现场观察和实验室实验。 这项研究将为了解南大洋生态系统中海洋种群与物理过程之间的相互作用作出宝贵贡献。 本研究的结果将适用于同时进行的研究，调查物理-生物相互作用，影响南极洋的南极磷虾，太平洋磷虾在加州电流。 最终的目的是量化的物理-生物斑块与物理特征和现象的影响，幼虫的条件，人口统计和招聘磷虾种群。 了解物种对物理扰动的反应将阐明环境如何在进化上限制生活史模式，以在固有的斑块和可变系统中最大限度地生存。 通过这种理解，这项研究将提供深入了解气候变化对磷虾种群及其生态系统的潜在影响。