Planktonic response to light as a pollution indicator

Phototropic response features for different systematic groups of mesoplankton under adverse environmental conditions

“…The preliminary series of experiments studied the time characteristics of the phototropic response of the Daphnia magna assemblage to attracting light. The experiment is partially described by us (Dyomin, Davydova, Morgalev, Olshukov, et al., 2019). According to holography data, chaotic movement with periodic daphnia release from the working volume was observed in the working volume of 1 L after the addition of zooplankton at the concentration of 3,000 ind m −3 (270 ind/cell).…”

“…The DHC allows registering a digital hologram of the entire studied volume of water with plankton per one exposure (laser pulse) and then restoring the image of this volume in a layers‐by‐layers mode. The software‐based DHC technology for digital hologram recording and processing allows automatically restoring the spatial distribution of particles in the studied volume (3D coordinates of each particle), determining the size, shape, speed, and direction of movement of each particle, and recognizing them (Dyomin, Davydova, et al., 2020; Dyomin, Davydova, Morgalev, Olshukov, et al., 2019; Dyomin, Gribenyukov, Davydova, et al., 2019; Dyomin et al., 2018; Dyomin, Polovtsev, Davydova, & Olshukov, 2019). Besides, it registers individuals with the minimum size of 100 μm at the resolution sufficient enough to identify plankton individuals.…”

“…The equipment created at Tomsk State University (TSU) (digital holographic cameras and hydrobiological probes based on them) (Dyomin, Davydova, et al., 2020; Dyomin, Gribenyukov, Davydova, et al., 2019; Dyomin et al., 2018, 2019) also provides measurements of individual particles, but differs from known analogues in the possibility of photostimulation with attracting radiation causing a phototropic response of zooplankton (Dyomin, Davydova, Morgalev, Olshukov, et al., 2019). The advantages include both a large size of the controlled volume and thus obtained representativeness of data.…”

Underwater Holographic Sensor for Plankton Studies In Situ including Accompanying Measurements

“…This paper does not consider the possibilities and features of the miniDHC for analyzing the parameters that characterize the vital activity of organisms. The study of behavioral activity and technical capabilities for this are discussed in the work [ 20 ].…”

“…For example, the concentration of plankton in combination with size determines the biomass (as a food resource for fish), the average size and dispersion may characterize the aboriginal-invading species ratio within the taxon, while the size dispersion characterizes life cycle. The study of behavioral activity and technical possibilities for this are discussed in the work [ 20 ].…”