Acoustics of Copepods and Micronekton in the Great South Channel

大南海峡中桡足类和微游生物的声学

• 批准号: 8915844
• 负责人: Bruce Frost
• 金额: $ 2.7万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8915844&HistoricalAwards=false
• 关键词: Acoustics; Copepods; Micronekton; Great; South

SCOPEX (South Channel Ocean Productivity Experiment) is a multidisciplinary program to investigate springtime aggregations of right whales off New England and the interactions between these whales and their main prey, the copepod Calanus finmarchicus. The underlying hypothesis is that whales are concentrated in this limited area each spring because of unusually dense concentrations of copepods. Possible causes of the copepod aggegations include advection, elevated production, behavior, or a combination of these factors. On cruises in spring 1988 and scheduled for spring 1989, measurements were made of whale distributions and behavior (H. Winn, R. Kenney, URI), zooplankton distributions (K. Wishner, URI), phytoplankton distributions and zooplankton feeding (E. Durbin, A. Durbin, URI), acoustic biomass (M. Macaulay, NMFS, B. Frost, UW), hydrography and currents (R. Beardsley, R. Limeburner, WHOI, P. Cornillon, URI). Preliminary results from the 1988 cruise showed that (1) whale dive times were correlated with the depth of a diel migrating acoustic layer, implying that the whales were feeding on plankton in this layer. (2) Dense copepod layers could be either strongly migrating or present continuously near the surface, with both interannual and geographic variability. Whales can feed on both types of layers. (3) No well-defined eddy (a possible concentrating mechanism) was associated with the plankton aggregations. While there was come indication of very slow flow at 50m and deeper, the near-surface drifters tended to move quickly out of the area. Further analysis of 1989 cruise samples will now be pursued to complete the investigation.

Scopex（South Channel海洋生产力实验）是一项多学科计划，旨在研究新英格兰的春季聚合以及这些鲸鱼与其主要猎物Copepod Calanus Finmarchicus之间的相互作用。 潜在的假设是，鲸鱼在每个春季都集中在该有限的区域，这是由于异常致密的copepods。 CopePod批准的可能原因包括对流，产量升高，行为或这些因素的组合。 在1988年春季的巡游中，定于1989年春季，测量了鲸鱼分布和行为（H. Winn，R。Kenney，Uri），浮游动物分布（K. wishner，uri），浮游植物分布，浮游植物分布和浮游动物（E. durbin，a. durbin，a. durbin，uili），frestic BimaSs b。水文和电流（R. Beardsley，R。Limeburner，Whoi，P。Cornillon，URI）。 1988年巡航的初步结果表明，（1）鲸鱼潜水时间与迪尔迁移的声学层的深度相关，这意味着鲸鱼在该层的浮游生物上进食。 （2）密集的CopePod层可以强烈迁移，也可以在地面附近连续迁移，均具有年际和地理变异性。 鲸鱼可以以两种类型的层为食。 （3）没有明确定义的涡流（可能的浓缩机制）与浮游生物聚集有关。 虽然有50m且更深的流动非常缓慢，但近表面的漂流者倾向于迅速移出该地区。 现在将进行对1989年巡航样品的进一步分析，以完成调查。