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| Titel |
Temporal variations of zooplankton biomass in the Ligurian Sea inferred from long time series of ADCP data |
| VerfasserIn |
R. Bozzano, E. Fanelli, S. Pensieri, P. Picco, M. E. Schiano |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 1 ; Nr. 10, no. 1 (2014-02-21), S.93-105 |
| Datensatznummer |
250116925
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| Publikation (Nr.) |
 copernicus.org/os-10-93-2014.pdf |
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| Zusammenfassung |
| Three years of 300 kHz acoustic doppler current profiler data collected in
the central Ligurian Sea are analysed to investigate the variability of the
zooplankton biomass and the diel vertical migration in the upper thermocline.
After a pre-processing phase aimed at avoiding the slant range attenuation,
hourly volume backscattering strength time series are obtained. Despite the
lack of concurrent net samples collection, different migration patterns are
identified and their temporal variability examined by means of time–frequency
analysis. The effect of changes in the environmental condition is also
investigated. The highest zooplankton biomasses are observed in April–May just
after the peak of surface primary production in March–April. The main
migration pattern found here points to a "nocturnal" migration, with
zooplankton organisms occurring deeper in the water column during the day and
shallower at night. Also, twilight migration is highlighted during this study.
The largest migrations are recorded in November–December, corresponding to
lowest backscattering strength values and they are likely attributable to
larger and more active organisms (i.e. euphausiids and mesopelagic fish). The
results suggest further applications of the available historical acoustic
doppler current profiler time series. |
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