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opencc-by-4.0Oct 2005View details →

Figure 3 in Types of cladoceran species described by Sven Ekman in the Swedish Museum of Natural History, with redescription of Daphnia cavicervix Ekman, 1900 (Daphniidae, Anomopoda, Cladocera)

Figure 3. Daphnia cavicervix, female from unknown water body near Morro Chico, Chile. (A) Antenna II; (B, C) apical segments of exopod and endopod; (D) limb I; (E) limb II; (F, G) limb III and its inner-distal portion; (H, I) limb IV and its inner-distal portion; (J) limb V. Scale bars: 0.1 mm.

opencc-by-4.0Oct 2005View details →

Figure 1 in Types of cladoceran species described by Sven Ekman in the Swedish Museum of Natural History, with redescription of Daphnia cavicervix Ekman, 1900 (Daphniidae, Anomopoda, Cladocera)

Figure 1. Daphnia cavicervix from unknown water body near Morro Chico, Chile. (A) Adult parthenogenetic female, lectotype; (B) its head; (C) juvenile female; (D) its head; (E) its postabdomen; (F) ephippial female; (G) sculpture of ephippium; (H) juvenile male, pre-reproductive instar; (I) its head; (J) adult male; (K) its head. Scale bars were not taken.

opencc-by-4.0Oct 2005View details →

Figure 4 in Types of cladoceran species described by Sven Ekman in the Swedish Museum of Natural History, with redescription of Daphnia cavicervix Ekman, 1900 (Daphniidae, Anomopoda, Cladocera)

Figure 4. Daphnia cavicervix from unknown water body near Morro Chico, Chile. (A) Ephippial female; (B) sculpture of ephippium, marginal portion; (C) sculpture of ephippium, portion close to egg chamber; (D) sculpture on egg chamber; (E) juvenile male (pre-reproductive instar); (F) its antenna I; (G) distal portion of its limb I. Scale bars: 0.1 mm.

Figure 10 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 10. UPGMA tree based on allozyme variation at seven loci in Daphnia spinulata populations from Argentina and D. exilis populations from North America. Data for most of the D. exilis populations are from Hebert & Finston (1993), but trimmed to the same seven loci surveyed in the Argentine populations. Codes for their populations are in capital letters and indicate the state where each was collected. Codes in small letters represent new D. exilis data and are found in Appendix 2, while the D. spinulata codes are in Appendix 1. The scale bar represents Nei's genetic distance.

Figure 6 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 6. Collection sites for Argentine populations belonging to the subgenus Ctenodaphnia. Photographs are included for a single individual of each species. Species assignments are based on genetic analyses (see text and subsequent figures). Animals are not shown to scale, and not all sites are shown (see Appendix 1 for the complete collection list).

Figure 7 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 7. NJ tree based on COI sequence variation among all unique haplotypes of Argentine populations belonging to the subgenus Ctenodaphnia. Two members of the subgenus Daphnia (D. obtusa and D. pulex) were included to root the tree. Bootstrap values are presented for major clusters, and K2P distances are indicated by the scale bar. The collection site of each individual is indicated by its population code (see Appendix 1). Individuals morphologically identified as D. notacantha are indicated by an asterisk. This tree is not intended to represent a phylogenetic hypothesis for the subgenus.

Figure 9 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 9. NJ tree based on COI sequence variation among a sample of Daphnia spinulata populations from Argentina and D. exilis populations from North America. The scale bar represents K2P distance. The codes for Argentine populations are provided in Appendix 1, while D. exilis codes are found in Appendix 2.

Figure 8 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 8. NJ tree based on COI sequences for two populations of North American and one population of South American Daphnia similis. Populations of Argentine D. spinulata and North American D. exilis are included for comparison. South American sequences are indicated in bold. The scale bar represents K2P distance.

Figure 5 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 5. NJ tree based on COI sequence variation among Argentine populations identified as D. laevis and D. gessneri. The identifications, based on head morphology, are indicated in this tree, followed by the collection site numbers. Sequences from the North American members of the D. laevis complex (D. dubia, D. laevis, and D. magniceps) were included for comparison. D. mendotae, a Hyalodaphnia species belonging to a different species complex (Colbourne & Hebert, 1996), was used to root the tree. The scale bar represents K2P distance.

Figure 4 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 4. Collection sites for Argentine populations belonging to the subgenus Hyalodaphnia. Photographs are included to demonstrate the several head morphologies encountered. The morphological, not genetic, forms encountered at each site are indicated on the map.

Figure 3 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 3. UPGMA tree based on allozyme variation at seven loci in three species of the Daphnia obtusa complex from Argentina. The scale bar represents Nei's genetic distance.

Figure 2 in Species diversity and endemism in the Daphnia of Argentina: a genetic investigation

Figure 2. NJ tree based on COI sequence variation among all unique haplotypes found in Argentine populations of the subgenus Daphnia. D. mendotae, a North American species belonging to the subgenus Hyalodaphnia, was included to root the tree. Bootstrap values for major clusters and among clusters are presented. The scale bar indicates K2P distances. D. obtusa 1 haplotype A was found at sites 1, 13, 15, 16, 17, 18, 20, 22, 26, 27, 40, 42, 46, 48, 122, 243, 249, 250, and 256; haplotype B was found at sites 132b, 169, 172, 183, 193, 194, and 195. D. 'pulicaria' haplotype C was found at sites 135, 156, 171, 202, and 205. All site codes are listed in Appendix 1. The NJ algorithm is used here for the purpose of clustering only; this tree is not intended to represent a phylogenetic hypothesis for the species assemblage.

opencc-zeroOct 2021View details →

A field experiment reveals seasonal variation in the Daphnia gut microbiome

The gut microbiome is increasingly recognized for its impact on host fitness, but it remains poorly understood how naturally variable environments influence gut microbiome diversity and composition. We studied changes in the gut microbiome of ten genotypes of water fleas (Daphnia magna) in submerged mesocosm enclosures in a eutrophic lake over a period of 16 weeks, from early summer to autumn. The microbial diversity increased when Daphnia were reintroduced from the laboratory to the lake, and the composition of gut microbes drastically changed. Both gut microbiome diversity and composition continued to change over the 16-week period, with alpha diversity peaking in late summer. The gut microbiome community was clearly distinct from that of the surrounding water, and temporal changes in the two communities were independent of each other. There were no consistent differences in the gut microbiomes among Daphnia genotypes in the lake environment. The change in gut microbiome over the season was accompanied by a decline in reproductive output and survival. There were weak, but statistically supported, effects of microbiota composition on Daphnia fitness, but there was no evidence that natural variation in microbiome diversity or composition was associated with tolerance to the cyanotoxin microcystin. We conclude that the gut microbiome of Daphnia is highly dynamic in a natural lake environment, but that host genetic effects on microbiome diversity and composition between genotypes within a population can be vanishingly small. These results emphasize that establishing the ecological effects of gut microbiota will require largescale experiments under natural conditions.

opencc-by-4.0Aug 2021View details →

Data from: Refining the evolutionary time machine: an assessment of whole genome amplification using single historical Daphnia eggs

This dataset contains the original raw sequence files used in the associated publication "Refining the evolutionary time machine: an assessment of whole genome amplification using single historical Daphnia eggs" by O'Grady, Dhandapani, Colbourne & Frisch in Molecular Ecology Resources. DOI:10.1111/1755-0998.13524   (filename > name used in associated publication) DF1_ATTACTC-GGCTCTG_L008_R1_001.fastq.gz -> DM1 DF2_TCCGGAG-GGCTCTG_L008_R1_001.fastq.gz -> DM2 DF3_CGCTCAT-GGCTCTG_L008_R1_001.fastq.gz -> DM3 DF4_GAGATTC-GGCTCTG_L008_R1_001.fastq.gz -> DM4 DF5_CTGAAGC-GGCTCTG_L008_R1_001.fastq.gz -> DM5 DF11_CTGAAGC-AGGCGAA_L008_R1_001.fastq.gz -> DM6 DF12_TAATGCG-AGGCGAA_L008_R1_001.fastq.gz -> DM7 DF6_TAATGCG-GGCTCTG_L008_R1_001.fastq.gz -> DP1 DF7_ATTACTC-AGGCGAA_L008_R1_001.fastq.gz -> DP4 DF8_TCCGGAG-AGGCGAA_L008_R1_001.fastq.gz -> DP5 DF9_CGCTCAT-AGGCGAA_L008_R1_001.fastq.gz -> DP2 DF10_GAGATTC-AGGCGAA_L008_R1_001.fastq.gz -> DP3 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-004_1.fastq.gz -> DP6 (fw) 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-004_2.fastq.gz -> DP6 (rv) 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-010_1.fastq.gz -> DP7 (fw) 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-010_2.fastq.gz -> DP7 (rv) 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-005_1.fastq.gz -> DP8 (fw) 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-005_2.fastq.gz -> DP8 (rv) 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-006_1.fastq.gz -> DP9 (fw) 170426_E00397_0064_BHJ2JWALXX_2_TP-D7-006_2.fastq.gz -> DP9 (rv)

opencc-zeroNov 2022View details →

Daphnia magna trade-off safety from UV radiation for food

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 Daphnia magna 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.

opencc-by-4.0Dec 2022View details →

Data from: Cost-saving population genomic investigation of Daphnia longispina complex resting eggs using whole genome amplification and pre-sequencing screening

This dataset contains all paired MiSeq sequences that were generated for the study "Cost-saving population genomic investigation of Daphnia longispina complex resting eggs using whole genome amplification and pre-sequencing screening" by Nickel and Cordellier. The sample names used in the study and the associated file names are explained in the table "Study_sample_names.xlsx"

opencc-by-4.0Feb 2023View details →

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)

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). 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> The original publication DOI: <a href="http://dx.doi.org/10.1039/C7EN01127J">http://dx.doi.org/10.1039/C7EN01127J</a> 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>

opencc-by-4.0Feb 2023View details →

Beyond microplastics: Water soluble synthetic polymers exert sublethal adverse effects in the freshwater cladoceran Daphnia magna - experimental Dataset

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> The file "dataset information" contains a description of the other files.

opencc-zeroAug 2023View details →

Mysterious microsporidians: springtime outbreaks of disease in Daphnia communities in shallow pond ecosystems

Parasites can play key roles in ecosystems, especially when they infect common hosts that play important ecological roles. Daphnia are critical grazers in many lentic freshwater ecosystems and typically reach peak densities in early spring. Daphnia have also become prominent model host organisms for the field of disease ecology, although most well-studied parasites infect them in summer or fall. Here, we report field patterns of virulent microsporidian parasites that consistently infect Daphnia in springtime, in a set of seven shallow ponds in Georgia, USA, sampled every 3–4 weeks for 18 months. We detected two distinct parasite taxa, closely matching sequences of Pseudoberwaldia daphniae and Conglomerata obtusa, both infecting all three resident species of Daphnia: D. ambigua, D. laevis, and D. parvula. To our knowledge, neither parasite has been previously reported in any of these host species or anywhere in North America. Infection prevalence peaked consistently in February-May, but the severity of these outbreaks differed substantially among ponds. Moreover, host species differed markedly in terms of their maximum infection prevalence (5% [D. parvula] to 72% [D. laevis]), mean reduction of fecundity when infected (70.6% [D. ambigua] to 99.8% [D. laevis]), mean spore yield (62,000 [D. parvula] to 377,000 [D. laevis] per host), and likelihood of being infected by each parasite. The timing and severity of the outbreaks suggest that these parasites could be impactful members of these shallow freshwater ecosystems and that the strength of their effects is likely to hinge on the composition of ponds' zooplankton communities.