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New article in Freshwater Biology

Subject: New article in Freshwater Biology
From: Sonja Amoser <>
Date: Thu, 16 Sep 2004 12:27:48 -0700
Andreas Lorke, Daniel F. McGinnis, Piet Spaak, Alfred Wuest (2004):
 Acoustic observations of zooplankton in lakes using a Doppler current
 profiler. Freshwater Biology; Volume 49, Issue 10, Page 1280-1292
 Abstract: 1. In this paper we test the usefulness of acoustic
 backscatter measurements from a 614 kHz Acoustic Doppler Current
 Profiler (ADCP) for the qualitative and quantitative characterisation of
 zooplankton distributions in lakes. ADCP-based backscatter estimates
 were compared with frequent net hauls obtained during a calibration
 experiment in which the acoustic backscatter was strongly dominated by
 vertical migrating Chaoborus flavicans larvae.
 2. The correlation between backscatter estimates and the C. flavicans
 concentration was very good. Vertical swimming speed of larvae, measured
 directly by the ADCP, was up to a maximum of 5 mm s1 and agreed very
 well with the observed vertical movement of the backscatter contour
 lines. Although the strong backscatter from C. flavicans overwhelmed the
 signal from the remaining zooplankton, a good correlation between
 backscatter strength and the total remaining zooplankton concentration,
 dominated by Cyclops spp., was found for the depth and time intervals
 where no C. flavicans were present.
 3. In addition to the calibration experiment, longer-term ADCP
 measurements from different lakes revealed a strong temporal correlation
 between the onset of the up- and downward migration of zooplankton and
 the local sunset and sunrise.
 4. We conclude that ADCPs can be used to monitor plankton distributions
 both temporally and spatially. It also seems possible to estimate
 plankton densities after appropriate calibration.
 Sonja Amoser, PhD Student
 Institut of Zoology, University of Vienna
 Althanstrasse 14, 1090 Vienna, Austria
 Tel: +43-1-4277-54515

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