Origins of Cod on Georges Bank: Contributions of Early Developmental Stages from the Scotian Shelf

乔治浅滩鳕鱼的起源：斯科舍大陆架早期发育阶段的贡献

• 批准号: 9813649
• 负责人: Richard Radtke
• 金额: $ 18.35万
• 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: 1998
• 资助国家: 美国
• 起止时间: 1998-10-15 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9813649&HistoricalAwards=false
• 关键词: Origins; Cod; Georges; Bank; Contributions

Origins of Cod on Georges Bank: Contribution of Early Developmental Stages from the Scotian ShelfRecent work in the Georges Bank-Gulf of Maine area has documented significant, and apparently episodic, fluxes of Scotian Shelf Water (SSW) from the Nova Scotian continental shelf to Georges Bank. SSW is a relatively cold and fresh water mass with a significant component from the St. Lawrence River, and is commonly identifiable with T-S analyses of hydrographic data and in satellite images of sea surface temperature. One such flux episode was observed March 1997 in satellite imagery and from shipboard hydrographic sampling on Georges Bank. Qualitative at-sea analyses of ichthyoplankton sampled on the March cruise revealed a remarkably tight association between abundances of gadid eggs and the distribution of SSW suggesting, along with other lines of evidence, that most of those eggs were spawned on the Scotian Shelf and were advected with the SSW water mass to Georges Bank. The fundamental question thus arises: to what extent are cod on Georges Bank imported to the Bank as early development stages by advection from Canadian waters to the east? The goal of this research is to answer this question. The approach will be two tiered: (1) performing retrospective elemental analyses of otoliths from archived larval cod samples, as well as of ichthyoplankton samples to be collected in 1998 and 1999 as part of the continuing Georges Bank GLOBEC project, analyzing them for Sr/Ca ratios, using an X-ray electron microprobe, and elemental "fingerprints", using UV lazer ablation inductively coupled plasma mass spectroscopy (ICPMS); and (2) assessing the genetic identity of the larvae relative to larval and adult populations from Georges Bank and from the Scotian Shelf using nuclear DNA microsatellite techniques.

COD在Georges Bank上的起源：缅因州乔治河畔斯科舍省货架上的早期发育阶段的贡献已记录了来自新星斯科省大陆架上的斯科舍省水（SSW）的巨大且显然是偶发的磁通量。 SSW是一个相对较冷的淡水质量，具有来自圣劳伦斯河的重要组成部分，通常可以通过水文数据和海面温度的卫星图像进行T-S分析。 1997年3月在卫星图像和乔治银行的船上水文采样中观察到了一个这样的磁通。 在3月巡游中采样的鱼类浮游生物的定性AT-SEA分析表明，大量的Gadid鸡蛋与SSW的分布之间存在着密切的关联，并表明SSW的分布以及其他证据表明，大多数这些卵是在苏格兰货架上产生的，并与SSW水质量一起向Georges Bask提供了。 因此出现了一个基本问题：乔治银行在乔治银行在多大程度上通过加拿大水域向东方的水流进口到银行的早期发展阶段？ 这项研究的目的是回答这个问题。 该方法将分为两个分层：（1）对归档幼虫鳕鱼样品的耳鼻喉的回顾性元素分析以及1998年和1999年收集的鱼类浮游物样本，作为持续的Georges Bank Globec项目的一部分，使用SR/CARITS，使用X-RAIRS和ELECTER LILAL SR/ELECTRARS LITAL'和ELLINAL LILAL'，'烧蚀性耦合等离子体质谱法（ICPMS）； （2）使用核DNA微卫星技术评估幼虫相对于幼虫和成年人群的遗传认同。