Formation of Micropatches by Zooplankton-Driven Microturbulences

Kils, Uwe (1993) Formation of Micropatches by Zooplankton-Driven Microturbulences Bulletin of Marine Science, 53 (1). pp. 160-169.

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The distribution and behavior of tintinnids Stenosernella nucula have been measured in situ within a microlayer formed by 39 million individuals⋅liter–1 with an optical particle counting- and imaging-system. The parallel propulsions of the many animals add up and drive strong downwelling water currents. Preliminary results for swimming-speeds, -directions and organism-distributions are presented. Probably due to gyrotaxis (Kessler, 1985, 1986) or some unknown bio/physical processes the organisms are focused into their self-generated velocity profile. Similar phenomena have been described for very dense plankton cultures as “bioconvection” (Childress et al., 1975a, 1975b; Platt, 1961; Plesset and Winet, 1974; Plesset et al., 1975). The micropatches are 2–4 mm wide and 8–340 mm deep with organism concentrations up to 215 million tintinnids⋅liter–1. The flows form small convection cells similar to Langmuir- or Benard-cells with distances between the patches of 8–30 mm. At the edge of the downwelling areas water velocity increases from near zero to 2–3 mm per s over a vertical distance of less than 1 mm resulting in considerable shear. Some ecological consequences of these microturbulences and microdistributions for predator-prey relationships and particle transports in eutrophic estuaries are discussed.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Refereed: Yes
ISSN: 0007-4977
Date Deposited: 05 Mar 2018 11:54
Last Modified: 05 Mar 2018 11:54

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