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Publication . Article . 2019

Zooplankton diel vertical migration in the Corsica Channel (north-western Mediterranean Sea) detected by a moored acoustic Doppler current profiler

D. Guerra; K. Schroeder; M. Borghini; E. Camatti; M. Pansera; A. Schroeder; A. Schroeder; +2 Authors
Open Access
Published: 01 Jan 2019 Journal: Ocean Science, volume 15, pages 631-649 (issn: 1812-0784, eissn: 1812-0792, Copyright policy )
Publisher: Copernicus Publications
Country: Italy

Abstract. Diel vertical migration (DVM) is a survival strategy adopted by zooplankton that we investigated in the Corsica Channel using acoustic Doppler current profiler (ADCP) data from April 2014 to November 2016. The principal aim of the study is to characterize migration patterns and biomass temporal evolution of zooplankton along the water column. The ADCP measured vertical velocity and echo intensity in the water column range between about 70 and 390 m (the bottom depth is 443 m). During the investigated period, zooplanktonic biomass had a well-defined daily and seasonal cycle, with peaks occurring in late winter to spring (2015 and 2016) when the stratification of the water column is weaker. Zooplanktonic biomass temporal distribution in the whole water column is well correlated with biomass of primary producers, estimated with satellite data. Zooplanktonic blooming and non-blooming periods have been identified and studied separately. During the non-blooming period zooplanktonic biomass was most abundant in the upper and the deep layers, while during the blooming period the upper-layer maximum in zooplanktonic biomass disappeared and the deep layer with high zooplanktonic biomass became thicker. These two layers are likely to correspond to two different zooplanktonic communities. The evolution of zooplanktonic biomass is well correlated with chlorophyll, with phytoplankton biomass peaks preceding the upper-layer secondary production by a lag of about 3.5 weeks. Nocturnal DVM appears to be the main pattern during both periods, but reverse and twilight migration are also detected. Nocturnal DVM was more evident at mid-water than in the deep and the upper layers. DVM occurred with different intensities during blooming and non-blooming periods. One of the main outcomes is that the principal drivers for DVM are light intensity and stratification, but other factors, like the moon cycle and primary production, are also taken in consideration.

Subjects by Vocabulary

Library of Congress Subject Headings: lcsh:Geography. Anthropology. Recreation lcsh:G lcsh:Environmental sciences lcsh:GE1-350

Microsoft Academic Graph classification: Zooplankton Light intensity Water column Diel vertical migration Stratification (water) Biomass (ecology) Oceanography Mediterranean sea Environmental science Acoustic Doppler current profiler



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Funded by
Ocean Food-web Patrol – Climate Effects: Reducing Targeted Uncertainties with an Interactive Network
  • Funder: European Commission (EC)
  • Project Code: 603773
  • Funding stream: FP7 | SP1 | ENV
Joint European Research Infrastructure network for Coastal Observatory – Novel European eXpertise for coastal observaTories
  • Funder: European Commission (EC)
  • Project Code: 654410
  • Funding stream: H2020 | RIA
Validated by funder
Related to Research communities
European Marine Science Marine Environmental Science : Ocean Food-web Patrol - Climate Effects: Reducing Targeted Uncertainties with an Interactive Network
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Article . 2019
Data sources: CNR ExploRA