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428 results for “zooplankton”
Pesticide exposure enhances dominance patterns in a zooplankton community
<p>Exposure to pesticides can profoundly alter community dynamics. It is expected that dominance patterns will be enhanced or reduced depending on whether the dominant species is less or more sensitive to the pesticide than the subdominant species. Community dynamics are, however, also determined by processes linked to population growth as well as competition at carrying capacity. Here, we used a mesocosm experiment to quantify the effect of chlorpyrifos exposure on the population dynamics of four cladoceran species (<em>Daphnia magna, D. pulicaria, D. galeata </em>and<em> Scapholeberis mucronata</em>) in mixed cultures, testing for direct effects of chlorpyrifos and indirect effects mediated by interactions with other species on timing of population growth and dominance at carrying capacity. We also quantified whether the pesticide-induced changes in community dynamics affect top-down control of phytoplankton. By adding a treatment in which we used different genotype combinations of each species, we also tested to what extent genetic composition affects community responses to pesticide exposure. Immobilization tests showed that <em>D. magna</em> is the least sensitive to chlorpyrifos of the tested species. Chlorpyrifos exposure first led to a reduction in the abundance of <em>D. galeata</em> to the benefit of <em>D. pulicaria</em>, and subsequently to a reduction in densities of <em>D</em>. <em>pulicaria</em> to the benefit of <em>D. magna</em>. This resulted in <em>D</em>. <em>magna</em> being more dominant in the pesticide than in the control treatment by the end of the experiment. There was no effect of genotypic differences on community patterns, and top-down control of phytoplankton was high in all treatments. Our results suggest that in this community dominance patterns are enhanced in line with the observed among-species differences in sensitivity to the pesticide. Our results also show that the development of the community in the pesticide treatment is a complex interaction between direct and indirect effects of the pesticide.</p>
Data for: Photoperiod effects in a freshwater community: amphibian larvae develop faster and zooplankton abundance increases under an early-season photoperiod
<p class="MsoNormal">Organisms that shift their phenologies in response to global warming will experience novel photic environments, as photoperiod (daylength) continues to follow the same annual cycle. How different organisms respond to novel photoperiods could result in phenological mismatches and altered interspecific interactions. We conducted an outdoor mesocosm experiment exposing green frog (<em>Rana clamitans</em>) larvae, gray treefrog (<em>Hyla versicolor</em>) larvae, phytoplankton, periphyton, and zooplankton to a three-month shift in photoperiod: an early-season photoperiod (simulating April) and a late-season photoperiod (simulating July). We manipulated photoperiod by covering and uncovering tanks with clear or light-blocking lids to mimic realistic changes in daylength. We assessed amphibian life history traits and measured phytoplankton, periphyton, and zooplankton abundances. Green frog larvae and gray treefrog metamorphs were more developed under the early-season photoperiod. Gray treefrog total length was also reduced, but photoperiod did not affect green frog total length. Although phytoplankton and periphyton abundances were not affected by photoperiod, copepod nauplii were in greater abundance under the early-season photoperiod. Overall, this simplified aquatic community did not exhibit significant changes to structure when exposed to a three-month shift in photoperiod. Temperate amphibians that breed earlier in the year may develop faster, which may have long-term costs to post-metamorphic growth and performance. Asynchronous shifts in zooplankton abundances in response to altered photoperiods could subsequently affect freshwater community structure. While photoperiod has been shown to individually affect freshwater organisms, our study using replicated outdoor wetland communities shows that the comprehensive effects of photoperiod may be less important than other cues such as temperature and precipitation.</p>
Data from: Alternative food sources interfere with removal of a fungal amphibian pathogen by zooplankton
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Fatty acid composition and content of seston, zooplankton, benthic invertebrates and fish in Lake Pyhäjärvi and Lake Köyliönjärvi
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Predicting the density of zooplankton subsidy to a stream with multiple impoundments using water quality parameters
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Environmental, phytoplankton, zooplankton and fish community data from Swedish lakes for food web analysis
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Hydrological connection links zooplankton communities and improves juvenile Chinook salmon growth in intertidal wetlands
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Data from: Can hot temperatures limit disease transmission? a test of mechanisms in a zooplankton-fungus system
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Pesticide exposure enhances dominance patterns in a zooplankton community
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The old and the large may suffer disproportionately during episodes of high temperature: evidence from a keystone zooplankton species
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Data from: Terrigenous subsidies in lakes support zooplankton production mainly via a green food chain and not the brown food chain
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Acclimation capacity and rate change through life in the zooplankton Daphnia
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Data from: Sampling effects drive the species-area relationship in lake zooplankton
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Data from: Virulence and transmission biology of the widespread, ecologically important pathogen of zooplankton, Spirobacillus cienkowskii
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Drivers of zooplankton dispersal in a pond metacommunity
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Data from: Temporal patterns in multiple stressors shape the vulnerability of overwintering Arctic zooplankton
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Seasonal oxygen, temperature, chlorophyll, and zooplankton data – Portage Lake, MN
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Data from: Investigating the effects of thermal variability and heatwaves on pond zooplankton communities and physiological traits
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Higher predation rate need not and did not lead to higher risk-induced trait responses in related zooplankton species
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Zooplankton and water quality data for 37 lakes in the Gwich'in and Inuvialuit regions of the Northwest Territories
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.