Zooplankton Aggregations Near Sills
نویسنده
چکیده
The primary goal during FY01/02 was to quantitatively assess zooplankton distributions and species in Knight Inlet, with special focus on the sill near Hoeya Head. This area has been the subject of considerable ONR-sponsored oceanographic research in the past focused on the stratified flow features induced by the sill (e.g. Farmer and Armi 1999; Klymak and Gregg 2001). Echo-sounder surveys performed in 1995 (reviewed during last FY) showed interesting zooplankton aggregations in this area, however the earlier acoustic systems were not calibrated nor were any zooplankton samples acquired.
منابع مشابه
Response of Euphausia pacifica to small-scale shear in turbulent flow over a sill in a fjord
Zooplankton in the ocean respond to visual and hydro-mechanical cues such as small-scale shear in turbulent flow. In addition, they form strong aggregations where currents intersect sloping bottoms. Strong and predictable tidal currents over a sill in Knight Inlet, Canada, make it an ideal location to investigate biological behaviour in turbulent cross-isobath flow. We examine acoustic data (38...
متن کاملHigh-frequency volume and boundary acoustic backscatter fluctuations in shallow water.
Volume and boundary acoustic backscatter envelope fluctuations are characterized from data collected by the Toroidal Volume Search Sonar (TVSS), a 68 kHz cylindrical array capable of 360 degrees multibeam imaging in the vertical plane perpendicular to its axis. The data are processed to form acoustic backscatter images of the seafloor, sea surface, and horizontal and vertical planes in the volu...
متن کاملSpatial distributions of zooplankton during coastal upwelling in western Lake Superior
Zooplankton distributions during coastal upwelling in western Lake Superior were mapped with a high-frequency (192~kHz) sonar system that consists of an echosounder and a navigation receiver connected to a microcomputer. An acoustic transect after a September storm revealed a sloping sound-scattering layer, traceable more than 5 km offshore, in the thermocline between an upwelling water mass an...
متن کاملPredator Effects on Dense Zooplankton Aggregations in the Coastal Ocean
The distribution of organisms in the ocean is highly heterogeneous, influencing both sampling and ecological structure. The complex spatial and temporal structure of predators and prey affect one another. Numerous studies in pelagic systems have investigated the effects of prey distribution on predator behavior and studies in benthic habitats have revealed the significant impacts predators can ...
متن کاملStable isotopes challenge the perception of ocean sunfish Mola mola as obligate jellyfish predators.
Evidence is provided from stable isotope analysis that aggregations of small ocean sunfish Mola mola (total length <1 m) feed broadly within coastal food webs and their classification as obligate predators of gelatinous zooplankton requires revision.
متن کامل