How internal waves influence the vertical distribution of zooplankton

Rinke, Karsten; Hübner, I.; Petzoldt, Thomas; Rolinski, Susanne; König-Rinke, Marie; Post, Johannes; Lorke, Andreas; Benndorf, Jürgen

doi:10.1111/j.1365-2427.2006.01687.x

Cited by 42 publications

(47 citation statements)

References 31 publications

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“…Similar findings have been already reported for cyanobacteria living in the top few meters of the water column (Olsen et al, 2000;Welker et al, 2003) and more generally, several papers have highlighted horizontal mass transfers occurring in phytoplankton and zooplankton communities living in the epilimnetic layer (Verhagen, 1994;Rinke et al, 2007;Serra et al, 2007). However, the main difference between this direct impact of the wind on phytoplankton and its indirect impact through internal waves is that the impact of internal waves persists for several days after the end of the wind event.…”

Section: Discussionsupporting

confidence: 53%

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

et al. 2010

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The vertical and horizontal distribution of the cyanobacterium, Planktothrix rubescens, was studied in a deep alpine lake (Lac du Bourget) in a 2-year monitoring program with 11 sampling points, and a 24-h survey at one sampling station. This species is known to proliferate in the metalimnic layer of numerous deep mesotrophic lakes in temperate areas, and also to produce hepatotoxins. When looking at the distribution of P. rubescens at the scale of the entire lake, we found large variations (up to 10 m) in the depth of the biomass peak in the water column. These variations were closely correlated to isotherm displacements. We also found significant variations in the distribution of the cyanobacterial biomass in the northern and southern parts of the lake. We used a physical modeling approach to demonstrate that two internal wave modes can explain these variations. Internal waves are generated by wind events, but can still be detected several days after the end of these events. Finally, our 24-h survey at one sampling point demonstrated that the V1H1 sinusoidal motion could evolve into nonlinear fronts. All these findings show that internal waves have a major impact on the distribution of P. rubescens proliferating in the metalimnic layer of a deep lake, and that this process could influence the growth of this species by a direct impact on light availability.

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Section: Discussionsupporting

confidence: 53%

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

et al. 2010

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“…On a diurnal time scale, the hydrographic conditions also showed some variability, as shown by the oscillations of thermo-and oxycline depths (Z therm and Z oxy ). This variability could be related to internal waves that may aVect the vertical dynamics of zooplankton (Pineda 1999;Johnson and Shanks 2002;Rinke et al 2007). The apparent semidiurnal frequency of the observed oscillations indicates tidal forcing of these internal waves, although local surface tidal amplitude is less than 1 m. The observed oscillations in cline depths may be stimulating, or at least enhancing, the "regular" diel vertical migration (descent in the early morning) observed for Centropages brachiatus.…”

Section: Dynamics Of Water Masses and Zooplankton Communitymentioning

confidence: 99%

Zooplankton vertical distribution and migration off Central Peru in relation to the oxygen minimum layer

et al. 2007

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Vertical distribution and diel vertical migration of a zooplankton community were studied at two stations oV Central Peru in April 2006. Zooplankton was collected at Wve depth strata by vertical hauls with Hydo-Bios multinet (300-m mesh, 0.25-m 2 mouth size). The zooplankton community was distributed in relation to a strong, shallow oxycline (1 ml l ¡1 oxygen isopleth generally above 36 m). The highest total abundance was always in the upper, welloxygenated layer. The most important species were: Acartia tonsa (72.86%), Centropages brachiatus (7.5%), and Paracalanus parvus (3.1%); Acartia tonsa was the dominant species at all times. Larvae of the polychaete Magelona sp. (7.5%) and larvae of the brachiopod Discinisca lamellosa (3.5%) were numerically dominant in April and small copepods e.g. Oncaea venusta (3.88%) were numerically dominant during August. Five distinct patterns of vertical distribution and migration in relation to the oxygen minimum layer were distinguished in this study: (1) Ontogenetic vertical migration through the oxycline (Acartia tonsa adults, nauplii, and copepodids), (2) permanent limitation to layers above the oxycline (e.g. Oikopleura sp., most invertebrate larvae), (3) distribution mostly below the oxycline with occasional migration into the layers just above the oxycline (Eucalanus inermis), (4) Diel Vertical Migration (Centropages brachiatus), and (5) reverse Diel Vertical Migration (larvae of the polychaete Magelona sp.).

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“…The methodology for studying zooplankton is rapidly evolving from the use of Hansen-type plankton nets to highly sophisticated acoustic (Hembre and Megard 2003;Lorke et al 2004;Rinke et al 2007;Huber et al 2011) or optical technologies (Herman 1988;Herman and Harvey 2006;Liebig et al 2006;Patoine et al 2006). The latter are even able to visualize individual zooplankton and count them in their natural environment (for a review, see Benfield et al 2007).…”

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confidence: 99%

“…This is a challenging task, however, due to the operational and constructional differences between the technologies and instruments concerned. Consequently, especially concerning freshwater environments, there is still a need of comprehensive comparisons of different zooplankton data collection techniques across a wide range of scales (from millimeters and seconds upwards) (Sutor et al 2005;Rinke et al 2007).…”

mentioning

confidence: 99%

“…Instruments that are currently used to measure scattering from zooplankton vary in their design, and some of them are actually manufactured for other purposes. The Acoustic Doppler Current Profiler (ADCP), for example, is primarily used for measuring current velocity, but it has also been adopted for the assessing of zooplankton biomass (Flagg and Smith 1989;Lorke et al 2004;Rinke et al 2007;Huber et al 2011). ADCP uses the Doppler effect to record vertical current profiles.…”

mentioning

confidence: 99%

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Intercalibration of an acoustic technique, two optical ones, and a simple seston dry mass method for freshwater zooplankton sampling

Rahkola-Sorsa

Voutilainen

Viljanen

2014

Limnology & Ocean Methods

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A thorough comparison is made of conventional and automated zooplankton sampling techniques. The findings offer tools for complementing netted and weighed zooplankton biomasses with estimates based on acoustic and optic techniques, and thereby fill a gap in our knowledge concerning the suitability of acoustic and optic techniques for freshwater zooplankton sampling. Plankton abundance in six large boreal lakes with varying characteristics was determined by four independent methods: one acoustic (Acoustic Doppler Current Profiler), two optic (laboratory versions of the Optic and Laser Optic Plankton Counter), and a simple seston dry mass (DM) method. The combined DM of Chaoborus and medium-sized zooplankton (300-500 μm) explained 63% of the original variability in the acoustic backscatter strength. The correspondence between the optical measurements and DM was especially good in the case of medium-sized zooplankton. Thus the LOPCderived biomass (ESD 351-500 μm) explained 90% of variation in the DM of zooplankton of size 300-500 μm. The medium-sized fraction consisted mainly of small Cyclopoida and copepodite stages of Eudiaptomus and Daphnia. Both optical devices, and particularly the LOPC, are reliable for analyzing preserved net samples of freshwater zooplankton, but in situ estimation of zooplankton abundances on the basis of ADCP results is not reliable without simultaneous net or optical sampling. Acoustic results can be calibrated by reference to DM or LOPC-derived biomass estimates. The combined use of acoustic and optical techniques clearly improves the spatio-temporal resolution of zooplankton measurements and can thus provide closer insights into ecosystem dynamics, including the forces which regulate plankton communities. *Corresponding author. E-mail: minna.rahkola@uef.fi AcknowledgmentsWe thank the skilful staff of the R/V Muikku for carrying out the sampling in the field, and all the ex-workers of the former Ecological Institute for their assistance in the laboratory. We are grateful to Greta Waissi-Leinonen, Irina Dushkina, and Matti Koistinen for running the OPC and LOPC routines and Kirsti Kyyrönen for drawing the map. We also thank professors (emeritus) Kalevi Salonen and Jouko Sarvala for their helpful comments and suggestions that improved the clarity of the manuscript. Malcolm Hicks kindly revised the English language of the manuscript.

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How internal waves influence the vertical distribution of zooplankton

Cited by 42 publications

References 31 publications

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake

Zooplankton vertical distribution and migration off Central Peru in relation to the oxygen minimum layer

Intercalibration of an acoustic technique, two optical ones, and a simple seston dry mass method for freshwater zooplankton sampling

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