Program and Agenda

Abstract

INTER- AND INTRA-ANNUAL VARIABILITY OF ZOOPLANKTON ABUNDANCE IN SAANICH INLET, BRITISH COLUMBIA

Variability in zooplankton abundance in Saanich Inlet, British Columbia, is quantified using 200-kHz echosounder data collected by the Victoria Experimental Network Under the Sea (VENUS) cabled observatory from 2006 - 2011. The continuous and high-resolution nature of our observations enable examination of daily, seasonal, and inter-annual modulation of diel vertical migration (DVM) in acoustic backscatter. A data ‘cube’ concept, wherein echosounder data are imaged as a ‘cube’ in [time of day] x [day] x [depth], was applied to characterize DVM variability. By detecting seasonal changes in migration timing, average volume backscattering strength (Sv) of the zooplankton scattering layers is estimated. The average Sv reaches its maximum in fall when euphausiids reach adulthood, while minimum Sv occurs in winter with more than 10 dB decrease from the peak value. Continuous DVM observed throughout the winter in 2008 (Nov 2008 – Feb 2009) is the only exception to the low-Sv pattern in winter. This study highlights the importance of high sampling resolution and long time-series records for characterizing the variability and complexity in zooplankton populations.

ePoster:

Authors

Sato, M., University of Washington, USA, meisato@uw.edu

Mackas, D. L., Institute of Ocean Sciences, Canada, Dave.Mackas@dfo-mpo.gc.ca

Dower, J. F., University of Victoria, Canada, dower@uvic.ca

Dewey, R., University of Victoria, Canada, rdewey@uvic.ca

Details

Poster presentation

Session #:056
Date: 2/27/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 2796