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61,005 resultsShowing papers similar to Phototactic Behavioral Responses of Mesozooplankton in the Barents Sea as an Indicator of Anthropogenic Impact
ClearUnderwater Digital Holography of Plankton with Advanced Monitoring Capabilities for Bioindication in Situ
This study presents a submersible digital holographic camera system for monitoring plankton in arctic waters, tracking behavioral characteristics that can indicate ecosystem stress. Long-term time series data from the camera revealed rhythmic patterns in plankton behavior useful as indicators of ecosystem health.
Environmental Contamination with Micro- and Nanoplastics Changes the Phototaxis of Euryhaline Zooplankton to Paired Photostimulation
A paired photostimulation behavioral assay using freshwater crustaceans was validated for detecting micro- and nanoplastic contamination in saltwater reservoirs, with zooplankton behavioral responsiveness serving as an early warning indicator. The method offers a rapid, biologically integrative approach to assessing plastic pollution in aquatic environments.
Early Detection of Contamination with Microplastics by Changing the Phototaxis of Freshwater Mesozooplankton to Paired Photostimulation
Researchers used changes in phototaxis behavior of aquatic microorganisms as an early detection indicator for microplastic contamination, demonstrating that behavioral assays can provide sensitive, low-cost monitoring of plastic pollution in water.
Early Detection of Contamination with Microplastics by Changing the Phototaxis of Freshwater Mesozooplankton to Paired Photostimulation
Researchers used changes in phototaxis behavior — movement toward or away from light — in small aquatic organisms as an early detection signal for microplastic contamination, finding that exposure altered phototactic responses at sub-lethal concentrations. The behavioral endpoint proved more sensitive than conventional survival or reproduction endpoints, suggesting phototaxis as a useful indicator for early contamination detection.
Phototropic Behavioral Responses of Zooplankton in Lake Baikal In Situ and during the Anthropogenic Impact Modeling
Researchers measured phototropic behavioral responses of Lake Baikal zooplankton in situ and during experimental anthropogenic impact modeling, finding that changes in behavior including risk-avoidance responses occurred at lower pollutant concentrations than survival or immobilization endpoints. Behavioral biomarkers are proposed as more sensitive early-warning indicators of environmental contamination than conventional toxicity tests.
Features of phototropic response of zooplankton to paired photostimulation under adverse environmental conditions
Researchers developed a paired photostimulation method — exposing zooplankton to two successive light pulses — that more reliably detects behavioral changes in Daphnia caused by pollutants including microplastics, outperforming single-stimulus methods and traditional survival-based bioindication for tracking aquatic toxicity.
Spectroscopic aspects of underwater digital holography of plankton
Researchers demonstrated that underwater digital holography — a technique that captures 3D images of plankton in real time without disturbing them — can monitor the rhythms of plankton populations and detect early signs of ecosystem stress, similar to how spectroscopy reveals the structure of atoms. Shifts in the natural timing patterns of plankton communities can serve as early warning signals of pollution or ecological disruption.
Daphnia’s phototaxis as an indicator in ecotoxicological studies: A review
Researchers reviewed how Daphnia — tiny freshwater crustaceans — use light-seeking behavior (phototaxis) as a stress indicator in water quality and toxicology studies, but cautioned that predators, food quality, and pigmentation can confuse results. The review recommends more standardized methods to improve the reliability of Daphnia phototaxis as a bioindicator of aquatic pollution.
Effects of water quality and seasonality on Zooplankton responses
This review examines how water quality parameters—temperature, dissolved oxygen, pH, salinity, and nutrient levels—and seasonal variation influence zooplankton abundance, diversity, and physiological responses. The authors synthesize evidence showing that zooplankton are sensitive bioindicators of environmental change in freshwater and marine ecosystems.
Locomotor activity of the Holarctic molluscs Radix auricularia (from Lake Baikal) in various light pollution conditions
Researchers tested the effect of different artificial lighting types (warm and cold white LED sources) on the locomotor activity of the freshwater mollusc Radix auricularia from Lake Baikal, finding that light spectrum and intensity significantly altered movement patterns compared to natural light conditions, contributing to understanding of light pollution impacts on freshwater invertebrates.
Geometric-Optical Model of Digital Holographic Particle Recording System and Features of Its Application
Not relevant to microplastics — this paper describes a calibrated geometric-optical model for a submersible digital holographic camera used to study plankton in the ocean, improving the accuracy of particle size and position measurements.
Combining multi-marker metabarcoding and digital holography to describe eukaryotic plankton across the Newfoundland Shelf
Researchers combined multi-marker metabarcoding and digital holography to characterize eukaryotic plankton diversity across the Newfoundland Shelf, demonstrating how integrating genomic and imaging tools improves high-frequency marine biodiversity monitoring.
A Review of Holography in the Aquatic Sciences: In situ Characterization of Particles, Plankton, and Small Scale Biophysical Interactions
This review examines the use of holography as an in situ tool for characterizing particle and plankton populations in aquatic research. It summarizes how holographic imaging can quantify particle fields and biophysical interactions without disturbing natural distributions in marine and freshwater environments.
Investigation of Anatomy of Zooplankton by DAPI, Nile Red and Phalloidin Staining
Researchers used fluorescent staining to study the body structures of four zooplankton species, and incidentally found Nile Red signals indicating microplastic particles inside some specimens — a secondary finding that supports the well-established pattern of zooplankton microplastic ingestion in marine environments. The primary focus of the paper is comparative zooplankton anatomy and phototaxis behavior, not microplastic contamination.
Monitoring Bioindication of Plankton through the Analysis of the Fourier Spectra of the Underwater Digital Holographic Sensor Data
Researchers developed a method to monitor plankton biodiversity using Fourier spectral analysis of plankton images, demonstrating that spectral features of plankton assemblages correlate with species composition and ecosystem health indicators. The approach offers a computationally efficient route to continuous bioindication in marine and freshwater monitoring programs.
An Ultracompact Underwater Pulsed Digital Holographic Camera With Rapid Particle Image Extraction Suite
Researchers designed and successfully deployed an ultracompact 3.5-kilogram underwater digital holographic camera in the North Sea, demonstrating real-time in-situ imaging of particles including potential microplastics in open ocean conditions at a fraction of the size and weight of existing underwater holographic systems.
Computational polarized holography for automatic monitoring of microplastics in scattering aquatic environments
Researchers developed an integrated imaging system based on computational polarized holography for automatic monitoring of microplastics in aquatic environments. The system enables accurate 3D tracking of dynamic microplastic particles, and a hybrid de-scattering algorithm substantially improves image quality even in turbid water conditions. An unsupervised clustering method was also developed to identify and classify different microplastics based on their multimodal features without manual annotation.
Photophysiologically active green, red, and brown macroalgae living in the Arctic Polar Night
Researchers compared the photophysiology and pigment composition of green, red, and brown macroalgae collected during the Arctic Polar Night and at the end of the light season. They found that macroalgae appeared healthier and showed new tissue growth during the dark period, with their photosynthetic apparatus remaining active but operating slowly. The study reveals that Arctic seaweeds have adapted to grow in complete darkness, challenging assumptions about their dependence on light.
Quantification of Very Low Concentrations of Colloids with Light Scattering Applied to Micro(Nano)Plastics in Seawater
Researchers evaluated static and dynamic light scattering techniques for detecting and quantifying colloidal microplastic and nanoplastic particles (0.1-0.8 micron diameter) at very low concentrations in marine water, demonstrating their potential as rapid, non-destructive monitoring tools.
Impacts of Environmental Change and Microplastic Pollution on Zooplankton
This review examined how environmental changes including warming, ocean acidification, and microplastic pollution are affecting zooplankton communities, covering effects on physiology, behavior, reproduction, and population dynamics. Combined stressors were found to have greater impacts than any single factor.
Polarization-sensitive digital holography for microplastic identification through scattering media
Researchers designed a polarization-sensitive holographic imaging system capable of identifying transparent microplastics through scattering media by measuring the degree of linear polarization (DoLP) as an angle-independent discriminating feature. The system enables non-destructive differentiation of microplastic types in turbid or complex optical environments where conventional imaging methods fail.
Simultaneous Measurements of Microplastic 3D Morphology and Naphthalene Adsorption Based on Digital Holographic Microscopy
Researchers used digital holographic microscopy to simultaneously measure microplastic particle morphology and naphthalene (a polycyclic aromatic hydrocarbon) adsorption in real time, providing a new tool for studying plastic-pollutant interactions in aquatic environments without disturbing the sample.
Toxicity of nanoplastics to zooplankton is influenced by temperature, salinity, and natural particulate matter
Researchers found that increased temperature and salinity promoted nanoplastic toxicity to zooplankton, while the presence of organic matter and natural colloids mitigated toxic effects, suggesting environmental conditions significantly modulate nanoplastic risks.
Impacts of nano- and micro-plastics exposure on zooplankton grazing, bacterial communities, and dimethylated sulfur compounds production in the microcosms
Researchers investigated how nano- and microplastics affect zooplankton grazing, bacterial communities, and the production of climate-relevant dimethyl sulfide compounds. The study found that plastic particle exposure reduced zooplankton feeding rates and disrupted dimethyl sulfide production in a dose- and size-dependent manner, with nanoplastics showing greater toxicity than larger microplastics.