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Patterns of diel vertical migration of zooplankton in acoustic Doppler velocity and backscatter data on the Newfoundland Shelf

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Abstract:

Backscatter data from moored acoustic Doppler current profilers (ADCPs) are analysed to quantify the diel vertical migration patterns of zooplankton on the Newfoundland Shelf, Canada. Data from 11 moorings provide long time series (~100 days each) for in-depth statistical analysis. For one deployment, dry weight measurements of zooplankton are used to calibrate the acoustic backscatter. Quantification methods are developed and applied to the backscatter and vertical velocity time series to determine the characteristics of the observed diel migration. We show that the migration responds to changes in light intensity and water column temperature structure. We have sufficient spatial data to show high correlation of migration characteristics over spatial scales of up to tens of kilometres.

Nous analysons les données de rétrodiffusion recueillies par des enregistreurs acoustiques de profils de courants Doppler (ADCP) amarrés sur la plate-forme de Terre-Neuve, Canada, afin de déterminer quantitativement les patrons de migration du zooplancton. Les données provenant de 11 points d'amarrage forment de longues séries (chacune d'environ 100 jours), ce qui rend possible une analyse statistique détaillée. Pour une des séries, des déterminations des masses sèches du zooplancton permettent de calibrer la rétrodiffusion acoustique. Nous mettons au point des méthodes de quantification que nous utilisons pour déterminer les caractéristiques de la migration journalière observée à partir des séries temporelles de rétrodiffusion et de vitesse verticale. Nous démontrons que la migration réagit aux changements d'intensité lumineuse et à la structure thermique de la colonne d'eau. Nous possédons suffisamment de données spatiales pour mettre en évidence une forte corrélation entre les caractéristiques de la migration sur des échelles spatiales pouvant atteindre des dizaines de kilomètres.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2006

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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