EAPSI: Determining the Response of Migratory Fish to Environmental and Climatic Variability

EAPSI：确定洄游鱼类对环境和气候变化的响应

• 批准号: 1713617
• 负责人: Heidi Ballew
• 金额: $ 0.54万
• 依托单位: Ballew Heidi E
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1713617&HistoricalAwards=false
• 关键词: EAPSI; Determining; Response; Migratory; Fish

This research will be completed in collaboration with leading fish migration expert, Dr. Gerard Closs at the University of Otago, and will identify factors and conditions influential to the success of migration in fishes. The implications of this study can be drawn broadly to understand the factors that influence migratory species under rapidly changing environmental and climatic conditions which will be foundational in determining future population dynamics of, often threatened, migratory fishes and will provide information for conservation and management of these threatened populations. Climate variability can influence the nutrients available in freshwater and marine aquatic systems which can subsequently affect the success of migratory organisms to move between those two environments, called diadromy. Additionally, stream flow can be influenced by climatic/environmental variability directly influencing the success of migratory individuals. In this study, we will evaluate how climatic processes, like El Niño, affect stream flow and marine and freshwater nutrient availability to determine if migration success is influenced in two migratory fish species, Gobiomorphus cotidianus and Galaxias argentius. This study will evaluate samples collected from streams representative of varying stream flow and nutrient productivity and will use MODIS satellite images to determine how changes in nutrient availability in the marine environment might influence migration success. Climate variability can affect the productivity of freshwater and marine systems influencing the success of aquatic migrants between those systems (i.e., diadromy). Migratory success can fluctuate in response to variable environmental conditions such as stream flow or productivity. The primary hypothesis of this study is that climate variation (i.e., El Niño) alters the success of migrants and residents by affecting stream flow regimes and marine and freshwater productivity by sampling two diadromous species, Gobiomorphus cotidianus and Galaxias argentius along stream flow and productivity gradients. Otolith microstructure and microchemistry analysis will be used to determine the rate at which individuals migrate from freshwater streams to marine environments under different climatic conditions (ENSO index). MODIS satellite images will be used to analyze the influence of coastal productivity on migration propensity across a nutrient/productivity gradient while land use/land change satellite imagery will be used as proxy for stream productivity to determine migration rate dynamics across a terrestrial nutrient gradient. This award, under the East Asia and Pacific Summer Institutes program, supports summer research by a U.S. graduate student and is jointly funded by NSF and the Royal Society of New Zealand.

这项研究将与领先的鱼类迁徙专家、奥塔哥大学的杰拉德·克洛斯博士合作完成，并将确定影响鱼类成功迁徙的因素和条件。这项研究的意义可以广泛地理解在快速变化的环境和气候条件下影响迁徙物种的因素，这将是确定经常受到威胁的迁徙鱼类未来种群动态的基础，并将为这些受威胁种群的保护和管理提供信息。气候变化会影响淡水和海洋水生系统中可用的营养物质，从而影响迁徙生物在这两种环境之间移动的成功，称为水迁。此外，河流流量可能受到气候/环境变化的影响，直接影响迁徙个体的成功。在这项研究中，我们将评估厄尔尼诺等气候过程如何影响溪流以及海洋和淡水营养物质的可用性，以确定两种洄游鱼类（Gobiomorphus cotidianus 和 Galaxias argentius）的洄游成功是否受到影响。这项研究将评估从代表不同溪流流量和养分生产率的溪流中收集的样本，并将使用 MODIS 卫星图像来确定海洋环境中养分可用性的变化如何影响迁移成功。气候变化会影响淡水和海洋系统的生产力，从而影响这些系统之间水生迁徙的成功（即水陆迁徙）。迁徙的成功率可能会因水流或生产力等可变的环境条件而波动。本研究的主要假设是，气候变化（即厄尔尼诺现象）通过沿着河流流量和生产力梯度对两种产卵物种（Gobiomorphus cotidianus 和 Galaxias argentius）进行采样，影响河流流量状况以及海洋和淡水生产力，从而改变移民和居民的成功。耳石微观结构和微观化学分析将用于确定不同气候条件下个体从淡水溪流迁移到海洋环境的速率（ENSO指数）。 MODIS 卫星图像将用于分析沿海生产力对养分/生产力梯度上迁移倾向的影响，而土地利用/土地变化卫星图像将用作溪流生产力的代理，以确定陆地养分梯度上的迁移率动态。 该奖项属于东亚和太平洋地区暑期学院计划，支持美国研究生的暑期研究，由美国国家科学基金会和新西兰皇家学会共同资助。