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130 results for “Daphnia magna”
Data for: Polystyrene nanoplastics differentially influence the outcome of infection by two microparasites of the host Daphnia magna
<p>This dataset supports the findings of the study 'Polystyrene nanoplastics differentially influence the outcome of infection by two microparasites of the host <em>Daphnia magna</em>', published in Philosophical Transactions of the Royal Society B (https://doi.org/10.1098/rstb.2022.0013).</p>
Data for: Sequential infection of Daphnia magna by a gut microsporidium followed by a haemolymph yeast decreases transmission of both parasites
<p>This dataset supports the findings presented in:<br> <br> Manzi, F., Halle, S., Seemann, L., Ben-Ami, F., & Wolinska, J. (2021). Sequential infection of <em>Daphnia magna</em> by a gut microsporidium followed by a haemolymph yeast decreases transmission of both parasites. <em>Parasitology,</em> 1-42. doi:10.1017/S0031182021001384</p>
Metagenome assemblies and metagenome-assembled genomes from the Daphnia magna microbiota
<p>Metagenome assemblies generated from raw reads not mapping to the Daphnia magna genome for six samples assembled individually (G4, G14, S1-S4) and a coassembly of all six samples (a_assembly) using metaSPAdes in SPAdes v3.14. Assemblies can be found in metagenome_assemblies.zip.</p> <p>Metagenome-assembled genomes generated using VAMB v3.0.2 (vamb_bins.zip) and ProxiMeta (proximeta_bins.zip). These MAGs were taxonomically identified using GTDB-Tk v1.3 and quality checked using CheckM v1.1. Outputs from GTDB-Tk and CheckM can be found in the .tsv and .tab files, respectively.</p>
Spatially mapping the baseline and bisphenol-A exposed Daphnia magna lipidome using desorption electrospray ionisa-tion - mass spectrometry
<p>Data from desorption electrospray ionisation - mass spectrometry of <em>Daphnia magna</em> tissue section from control and daphnids exposed to 5 ppm of bisphenol A over their 7<sup>th</sup> adult instar, specifically four sampling points; 8, 24, 48 and 72 h after the 6<sup>th</sup> brood, as well as data acquired from a blank DESI slide.</p> <p>Data is provided in the form of *imzML files with the associated *.ibd of the same name.</p>
Data for fitness analyses used in: Environmentally-induced DNA methylation is inherited across generations in water fleas (Daphnia magna)
<p><span>Data of</span> fitness effects of environmental stressors on <em>Daphnia magna</em> over multiple generations. Ages of first and second reproduction, and sizes of first and second brood were measured and used to calculate replacement rate. This data is part of a study on whole-genome bisulphate sequencing on individual <em>Daphnia magna</em> to assess whether environmentally-induced DNA methylation can persist for up to four generations.</p>
Figure 1 in Morphological examination of the resting egg structure of 3 cladoceran species [Ceriodaphnia quadrangula (O. F. Müller, 1785), Daphnia longispina (O. F. Müller, 1776), and D. magna Straus, 1820]
Figure 1. Resting egg photos of 3 species (Daphnia magna, D. longispina, Ceriodaphnia quadrangula). A) SEM photo of C. quadrangula, B) SEM photo of D. longispina, C) SEM photo of D. magna, D) light microscope photo of C. quadrangula, E) light microscope photo of D. longispina, F) light microscope photo of D. magna.
Figure 5 in Ecotoxicological investigation of cyanobacterial crude extracts to Daphnia magna under subchronic test conditions
Figure 5. Filtration (A) and ingestion (B) rates of Daphnia magna after exposing to cyanobacterial crude extracts. Asterisks indicate significant differences by the Kruskal-Wallis test, followed by the Wilcoxon rank-sum test for multiple comparison (*P ≤.05).
Figure 2 in Ecotoxicological investigation of cyanobacterial crude extracts to Daphnia magna under subchronic test conditions
Figure 2. The degradation of eggs and neonates (red arrows) of the Daphnia magna gravid females exposed to cyanobacterial crude extracts. A: dead eggs, B: dead neonate, C: malformation of the tail, and D: normal tail of control Daphnia magna.
Figure 1 in Ecotoxicological investigation of cyanobacterial crude extracts to Daphnia magna under subchronic test conditions
Figure 1. The effects of cyanobacterial crude extracts on the brood size. A: the first brood, B: the second brood. Asterisks indicate significant differences by the Kruskal-Wallis test, followed by the Wilcoxon rank-sum test for multiple comparison (*P <.05, **P <.01, ***P <.001).
Figure 3 in Ecotoxicological investigation of cyanobacterial crude extracts to Daphnia magna under subchronic test conditions
Figure 3. Regression equations and correlation coefficients (R2) describing the highest correlations between the number of neonates per female (as mean) and CCE concentrations. The red color indicates the microcystin-containing crude extract and the green color indicates the microcystin-free crude extract.
Figure 4 in Ecotoxicological investigation of cyanobacterial crude extracts to Daphnia magna under subchronic test conditions
Figure 4. The effects of cyanobacterial crude extracts on somatic growth of Daphnia magna. Asterisks indicate significant differences by the Kruskal-Wallis test, followed by the Wilcoxon rank-sum test for multiple comparison (*P <.05, **P <.01, ***P <.001).
Fitness cost from fluctuating ultraviolet radiation in Daphnia magna
<p><span><span><span><span><span><span><span><span><span><span><span>Solar ultraviolet radiation (UVR) is an important environmental threat for organisms in aquatic systems, but its temporally variable nature makes the understanding of its effects ambiguous. The aim of our study was to assess potential fitness costs associated with fluctuating UVR in the aquatic zooplankter <i>Daphnia magna</i>. We investigated individual survival, reproduction and behaviour when exposed to different UVR treatments. Individuals exposed to fluctuating UVR, resembling natural variations in cloud cover, had the lowest fitness (measured as the number of offspring produced during their lifespan). In contrast, individuals exposed to the same, but constant UVR dose, had similar fitness as control individuals (not exposed to UVR), but they showed a significant reduction in daily movement. The re-occurring threat response to the fluctuating UVR treatment thus had strong fitness costs for <i>D. magna</i>, and we found no evidence for plastic behavioural responses when continually being exposed to UVR, despite the regular, predictable exposure schedule. In a broader context, our results imply that depending on how variable a stressor is in nature, populations may respond with alternative strategies, a framework that could promote rapid population differentiation and local adaptation.</span></span></span></span></span></span></span></span></span></span></span></p>
Daphnia magna trade-off safety from UV radiation for food
<p><span><span><span><span><span><span><span><span><span><span><span>Research on diel vertical migration (DVM) is generally conducted at the population level, whereas few studies have focused on how individual animals behaviorally respond to threats when also having access to foraging opportunities. We utilized a 3-D tracking platform to record the swimming behavior of <i>Daphnia magna</i> exposed to ultraviolet radiation (UVR) in the presence or absence of a food patch. We analyzed the vertical position of individuals before and during UVR exposure and found that the presence of food reduced the average swimming depth during both sections of the trial. Since UVR is a strong driver of zooplankton behavior, our results highlight that biotic factors, such as food patches, have profound effects on both the amplitude and the frequency of avoidance behavior. In a broader context, the trade-off between threats and food adds to our understanding of the strength and variance of behavioral responses to threats, including DVM.</span></span></span></span></span></span></span></span></span></span></span></p>
RDF version of the supplementary data from Shin, Hyun Kil and Seo et al. Meta-analysis of Daphnia magna nanotoxicity experiments in accordance with test guidelines. Environ. Sci.: Nano (2018)
<p>This is an RDF version of the dataset published by Shin, Hyun Kil and Seo et al. as a supplement of the study Meta-analysis of Daphnia magna nanotoxicity experiments in accordance with test guidelines. Environ. Sci.: Nano (2018).</p> <p>The original dataset is available online: <a href="https://ui.staging.kit.cloud.douglasconnect.com/dataexplorer?dataset=ab2bc1ee-99dc-4ddf-b1f9-9fdeb8a0f48c%3A1&q=%7B%7D">https://ui.staging.kit.cloud.douglasconnect.com/dataexplorer?dataset=ab2bc1ee-99dc-4ddf-b1f9-9fdeb8a0f48c%3A1&q=%7B%7D</a></p> <p>The original publication DOI: <a href="http://dx.doi.org/10.1039/C7EN01127J">http://dx.doi.org/10.1039/C7EN01127J</a></p> <p>GitHub repository of the datasets converted to RDF along with RML mappings: <a href="https://github.com/ammar257ammar/RDFied-datasets">https://github.com/ammar257ammar/RDFied-datasets</a></p>
Beyond microplastics: Water soluble synthetic polymers exert sublethal adverse effects in the freshwater cladoceran Daphnia magna - experimental Dataset
<p>This Dataset contains the raw experimental data for the article "Beyond microplastics: Water soluble synthetic polymers exert sublethal adverse effects in the freshwater cladoceran Daphnia magna" by Simona Mondellini, Matthias Schott, Martin G.J. Löder, Seema Agarwal, Andreas Greiner, Christian Laforsch. Published on Science of the Total Environment (2022) <a href="https://doi.org/10.1016/j.scitotenv.2022.157608">https://doi.org/10.1016/j.scitotenv.2022.157608</a><br> The file "dataset information" contains a description of the other files.</p>
Daphnia magna trade-off safety from UV radiation for food
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Data for fitness analyses used in: Environmentally-induced DNA methylation is inherited across generations in water fleas (Daphnia magna)
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Fitness cost from fluctuating ultraviolet radiation in Daphnia magna
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Data from: Haemoglobin-mediated response to hyper-thermal stress in the keystone species Daphnia magna
Anthropogenic global warming has become a major geological and environmental force driving drastic changes in natural ecosystems. Due to the high thermal conductivity of water and the effects of temperature on metabolic processes, freshwater ecosystems are among the most impacted by these changes. The ability to tolerate changes in temperature may determine species long-term survival and fitness. Therefore, it is critical to identify coping mechanisms to thermal and hyper-thermal stress in aquatic organisms. A central regulatory element compensating for changes in oxygen supply and ambient temperature is the respiratory protein haemoglobin (Hb). Here, we quantify haemoglobin (Hb) plastic and evolutionary response in D. magna (sub)populations resurrected from the sedimentary archive of a lake with known history of increase in average temperature and recurrence of heat waves. By measuring constitutive changes in crude Hb protein content among (sub)populations we assessed evolution of the haemoglobin gene family in response to temperature increase. To quantify the contribution of plasticity in the response of this gene family to hyper-thermal stress, we quantified changes in Hb content in all (sub)populations under hyper-thermal stress as compared to non-stressful temperature. Further, we tested competitive abilities of genotypes as a function of their Hb content, constitutive and induced. We found that haemoglobin (Hb)-rich genotypes have superior competitive abilities as compared to Hb-poor genotypes under hyper-thermal stress after a period of acclimation. These findings suggest that whereas long-term adjustment to higher occurrence of heat waves may require a combination of plasticity and genetic adaptation, plasticity is most likely the coping mechanism to hyper-thermal stress in the short term. Our study suggests that with higher occurrence of heat waves Hb-rich genotypes may be favoured with potential long-term impact on population genetic diversity
Ancestral environment determines the current reaction to ultraviolet radiation in Daphnia magna
<p><span>An individual's phenotype can be altered by direct contact with its present environment but also by environmental features experienced by previous generations, i.e. parental or grandparental effects. However, the strength and direction of these transgenerational effects may be highly variable according to the ecological conditions experienced by ancestral generations. Here we performed a reciprocal split-brood experiment to compare transgenerational responses to the threat of ultraviolet radiation (UVR) in the zooplankter <em>Daphnia magna</em>, which had, or had not, been exposed to UVR for more than 150 generations, respectively. We found that the environment at which parents and grandparents were reared significantly influenced both behavior and life-history traits of their descendants. However, such transgenerational responses </span><span>differed between <em>D. magna</em> individuals with contrasting ancestral stress history</span><span>, that is, when exposed to UVR previously unexposed individuals rapidly changed their behavior and life-history traits, whereas individuals previously exposed to UVR showed less pronounced response when the UVR threat level relaxed. Hence, we here demonstrate an asymmetric transgenerational plasticity in response to UVR threat. The findings advance our understanding on the evolutionary ecology of such transgenerational effects and their potential role in response to changes in the local environment.</span></p>
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