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55 results for “MeerKAT”
The Thousand-Pulsar-Array program on MeerKAT -- IX. The time-averaged properties of the observed pulsar population: data set
<p>This archive contains pulsar data presented as part of the MNRAS paper: <em>"The Thousand-Pulsar-Array program on MeerKAT -- IX. The time-averaged properties of the observed pulsar population"</em>.</p> <p>Folded, time-averaged pulse profiles (4 Stokes parameters, 8 frequency channels, 1024 time bins across the period) of the 1271 pulsars listed in Table 1 of the MNRAS paper are included in the ar_files.zip. Ephemerides of these pulsars (as used in the MNRAS paper) are included in the eph_files.zip. The pulsar data are readable by the PSRCHIVE package, see e.g. van Straten et al., Astronomical Research and Technology 9, 237 (2012).</p> <p>Tables 1, 5, and 6 from the MNRAS paper are included in tables_files.zip as .csv files. The file column_descriptions.txt describes the quantities in columns of these tables.<br> </p>
Data and code for: Diurnal oscillations in gut bacterial load and composition eclipse seasonal and lifetime dynamics in wild meerkats, Suricata suricatta
<p>Data and code to go with our publication "Diurnal oscillations in gut bacterial load and composition eclipse seasonal and lifetime dynamics in wild meerkats, <em>Suricata suricatta", </em>Nature Communications (2021).</p> <p><strong>FILE DESCRIPTIONS</strong></p> <p><em>****** DATA ******</em></p> <p><strong>meerkat_16S_data.tar.gz</strong> # 16S V4 amplicon sequences sequenced on an Illumina MiSeq platform using primer pair 515F and 806R, including all faecal samples, controls, and sand samples. Sequence identifiers and basic metadata are in <strong>sequence_identifiers.csv.</strong></p> <p><strong>sequence_identifiers.csv </strong># Simple metadata and identifiers for all sequences/samples (what type of sample/sequencing run, etc), required for QIIME2 processing of the raw fasta.gz files contained in meerkat_16S_data.tar.gz. It contains a column for whether the sample was included in the final analysis. Does not include sample biological metadata as generating this data requires access to Kalahari Meerkat Project database. Biological metadata for samples included in the final analysis are instead provided in <strong>processed_data_phyloseq.RDS </strong>and can be accessed via <em>phyloseq::sample_data(processed_data_phyloseq)</em>.</p> <p><strong>processed_data_phyloseq.RDS</strong> # Phyloseq object containing the processed data used in the presented analysis. Contains data for 1109 samples, and includes the ASV table, the taxonomic classification, the phylogenetic tree, and the sample metadata used in the analysis.</p> <p><strong>technical_replicate_data_phyloseq.RDS</strong> # Phyloseq object containing data from the 16 technical replicates.</p> <p><strong>pilot_study_data_phyloseq.RDS</strong> # Phyloseq object containing data from the pilot study on captive meerkats.</p> <p><em>****** CODE ******</em></p> <p><strong>CODE1_QIIME_script.R</strong> # QIIME2 script to generate ASV table, taxonomy, and phylo tree from <strong>meerkat_16S_data.tar.gz. </strong>Requires a reference taxonomy (SILVA) and a reference phylogeny (SEPP) for taxonomic and phylogenetic placements.</p> <p><strong>CODE2_processing_QIIME_output.Rmd</strong> # R markdown script that processes the QIIME2 output generated by <strong>CODE1_QIIME_script.R</strong>. Does not generate meerkat metadata as this requires access to the Kalahari Meerkat Project database. This metadata is provided in <strong>processed_data_phyloseq.RDS.</strong></p> <p><strong>CODE3_data_analysis_script.Rmd </strong># R markdown script that generates data and figures presented in paper, using data from <strong>processed_data_phyloseq.RDS, technical_replicate_data_phyloseq.RDS, </strong>and<strong> pilot_study_data_phyloseq.RDS.</strong></p> <p><em>****** R MARKDOWN REPORTS ******</em></p> <p>The following reports are html files that show the code output for the two RMD files above.</p> <p><strong>RMARKDOWN_data_processing.html </strong># R markdown report for<strong> CODE2_processing_QIIME_output.Rmd</strong></p> <p><strong>RMARKDOWN_data_analysis.html </strong># R markdown report for <strong>CODE3_data_analysis_script.Rmd</strong></p> <p>*****************************</p> <p>For general queries, unexpected errors and/or inconsistencies, please contact riselya@gmail.com.</p> <p> </p>
Fig. 4 in Meerkats (Suricata suricatta), a new definitive host of the canid nematode Angiostrongylus vasorum
Fig. 4. Agarose gel (1.5%) stained with GelRed™ showing PCR products of part of the internal transcribed spacer (ITS) 2-region of Angiostrongylus vasorum of 37 gastropod samples: samples no. 8, 23, 29 and 35 were positive. M: DNA ladder, N: negative control, P: positive control.
Fig. 3 in Meerkats (Suricata suricatta), a new definitive host of the canid nematode Angiostrongylus vasorum
Fig. 3. Histological image of the lung of an Angiostrongylus vasorum infected meerkat. An adult nematode within a thickened artery (A), larvae and eggs surrounded by plasma cells, macrophages, neutrophilic granulocytes and lymphocytes (B) are visible, indicating granulomatous pneumonia as well as intima and media hyperplasia of larger lung vessels. (Hematoxylin and eosin staining, original magnification x 100 (A), x 400 (B)).
Fig. 1 in Meerkats (Suricata suricatta), a new definitive host of the canid nematode Angiostrongylus vasorum
Fig. 1. Angiostrongylus vasorum first stage larva isolated by the Baermann technique from a collective faecal sample of a meerkat group. Average size: 332 μm in length and 14.1 μm in width.
Fig. 2 in Meerkats (Suricata suricatta), a new definitive host of the canid nematode Angiostrongylus vasorum
Fig. 2. Sequence alignment of part of the internal transcribed spacer (ITS) 2-region (78 bp) of Angiostronglus vasorum (GenBank accession no. KF270683), of DNA isolated from A. vasorum first stage larvae obtained from meerkats and from one slug.
Spectral-index maps for the MeerKAT-2019 subset of the G4Jy Sample
<p>Spectral-index maps for sources in the MeerKAT-2019 subset of the G4Jy Sample. The component MeerKAT spectral-index maps can be accessed as both .png and .fits files via the SARAO archive: https://archive-gw-1.kat.ac.za/public/repository/10.48479/wyab-t838/index.html . See Sejake et al. (2022) for further details.</p>
The Thousand-Pulsar-Array programme on MeerKAT - VIII. The subpulse modulation of 1198 pulsars
<p>These datasets and document are online appendices beyond those provided in the main journal manuscript "The Thousand-Pulsar-Array programme on MeerKAT - VIII. The subpulse modulation of 1198 pulsars" by Song et al. published in Monthly Notices of the Royal Astronomical Society in 2023.</p> <p>File supplementary_appendices.pdf contains supplementary online appendices.</p> <p>Files appendix_a1_table_observationalparameters.pdf and appendix_a2_table_spectralmeasurements.pdf are two tables summarising the observational related parameters, and subpulse modulation measurements respectively. </p> <p>File appendix_spectralfigures.pdf contains spectral figures for all sources.</p> <p>Zip files (RA*_spectralfigures.zip) contain original and shuffled spectral figures for individual pulsars within a specific RA range.</p>
The role of neighbour proximity and context on meerkat close call acoustic structure
<p><span>In many animal species, including humans, producer arousal state is considered a key modifier of vocal production and structure. Encoding of affective arousal state in vocalisations provides a rapid means of information transfer about an individual's internal state, potentially reflecting its response to external stimuli. Meerkats, Suricata suricatta, are a highly vocal species. They use close calls to maintain group cohesion while foraging. Due to their patchily distributed prey, motivation for neighbour proximity varies; being too close results in competition (increased arousal - aggression), while too far results in risks of losing the group and predation threats (increased arousal - fear). We investigated how neighbour proximity, and also behavioural, social and environmental context, influence the acoustic structure of wild wild meerkats' close calls. We found little effect of neighbour distance on the majority of the acoustic parameters measured. However, there was a consistent effect of the behavioural context in which the call was given across several acoustic parameters. Additionally, if the nearest neighbour was a pup calls became longer, lower and quieter. Overall, meerkat close calls potentially convey information on current behaviour and are modified in relation to social context. This highlights a potential mechanism in the diversification of acoustic signals. </span></p>
Data from: Disentangling the effects of temperature and rainfall on the population dynamics of Kalahari meerkats
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The role of neighbour proximity and context on meerkat close call acoustic structure
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Meerkat helpers buffer the detrimental effects of adverse environmental conditions on fecundity, growth and survival
<p>1. Recent comparative studies show that cooperative breeding is positively correlated with harsh and unpredictable environments and it is suggested that this association occurs because helpers buffer the negative effects of adverse ecological conditions on fitness.</p> <p>2. In the Kalahari, rainfall varies widely between- and within years, affecting primary production and the availability of the principal prey of cooperatively breeding Kalahari meerkats, Suricata suricatta. Our study aimed to establish whether the presence and number of helpers buffer the negative effects of variation in rainfall on the fecundity and body mass of breeding females, and the survival and growth of pups.</p> <p>3. We investigate the relationship between group size and variation in rainfall on dominant female fecundity, body mass, and offspring survival and growth using an additive modeling approach on twenty-one years of individual-based records of the life histories of individual meerkats.</p> <p>4. We show that breeding female fecundity is reduced during periods of low rainfall but that the effects of low rainfall are mitigated by increases in group size and body mass because heavier females and those in larger groups have increased fecundity and reduced interbirth intervals. Pup growth and survival are also reduced during periods of low rainfall, but more so in smaller groups.</p> <p>5. Our results support the suggestion that cooperative breeding mitigates the detrimental effects of adverse environmental conditions and may enhance the capacity of species to occupy environments where food availability is low and unpredictable.</p>
Long-term movements and home range changes: rapid territory shifts in meerkats
<p>1. Territoriality and stable home ranges are a common space use pattern among animals. These ranges provide its inhabitants with important resources and thus favourable territories are associated with an increased fitness. While the role of territory quality and changes of territory ownership have often been investigated, the changes of territorial boundaries have been less studied.</p> <p>2. Here we investigated space use changes in a social mammal species, applying a novel analytical approach, calculating long-term dissimilarity in space use using distance matrices based on periodic utilization distributions. This approach makes it possible to identify different space use patterns, which cannot be distinguished by only considering changes between consecutive time periods.</p> <p>3. We analysed meerkat (Suricata suricatta) movements of a total of 24 different groups over a 16-year period, resulting in 134 group years. We then correlated the identified home range changes to life history events and possible environmental drivers.</p> <p>4. Groups had stable territories for several years before they abandoned their home range mostly to move quickly to new areas where they again remained for several years. Of 26 identified sudden shifts, 22 occurred in the summer months and often involved distances larger than the original home range size. Home-range movements that were close together in time were often also spatially clustered and moved in a similar direction. These shifts were often preceded by more frequent interactions between groups, but did not seem to be a product of direct displacements by other groups. The normalized difference vegetation index (NDVI) as a measure of food production and social factors such as dominance changes did not correlate to changes.</p> <p>5. Against our expectation space use changes were not accumulations of small changes, but more often involved long distance moves into unknown ranges. This means that the groups enter areas where they cannot profit from local knowledge. The methods used identifies episodes of long stability alternated by sudden changes in meerkats and in general provides insight into long-term space use. Our methods can be used to analyse long-term space use, either within or across species.</p>
Data from: Androgens predict parasitism in female meerkats: a new perspective on a classic trade-off
The immunocompetence handicap hypothesis posits that androgens in males can be a 'double-edged sword', actively promoting reproductive success, while also negatively impacting health. Because there can be both substantial androgen concentrations in females and significant androgenic variation among them, particularly in species portraying female social dominance over males or intense female–female competition, androgens might also play a role in mediating female health and fitness. We examined this hypothesis in the meerkat (Suricata suricatta), a cooperatively breeding, social carnivoran characterized by aggressively mediated female social dominance and extreme rank-related reproductive skew. Dominant females also have greater androgen concentrations and harbour greater parasite loads than their subordinate counterparts, but the relationship between concurrent androgen concentrations and parasite burdens is unknown. We found that a female's faecal androgen concentrations reliably predicted her concurrent state of endoparasitism irrespective of her social status: parasite species richness and infection by Spirurida nematodes, Oxynema suricattae, Pseudandrya suricattae and coccidia were greater with greater androgen concentrations. Based on gastrointestinal parasite burdens, females appear to experience the same trade-off in the costs and benefits of raised androgens as do the males of many species. This trade-off presumably represents a health cost of sexual selection operating in females.
Reproduction package for 'Low-frequency radio observations of recurrent nova RS Ophiuchi with MeerKAT and LOFAR'
<p>This is a basic reproduction package for the paper "Low-frequency radio observations of recurrent nova RS Ophiuchi with MeerKAT and LOFAR".</p><p> </p><p> </p>
Dominance loss and tenure maintenance in Kalahari meerkats
<p>In many social species, both the acquisition of dominance and the duration that individuals maintain their status are important determinants of breeding tenure and lifetime reproductive success. However, few studies have yet examined the extent and causes of variation in dominance tenure and the duration of breeding lifespans. Here we investigate the processes that terminate dominance tenures and examine how they differ between the sexes in wild Kalahari meerkats (<em>Suricata suricatta</em>), a cooperative breeder where a dominant breeding pair produces most of the young recruited into each group. Mortality and displacement by resident subordinate competitors were important forms of dominance loss for both sexes. However, dominant males (but rarely females), were also at risk of takeovers by extra-group invading males. Dominant males also differed from dominant females in that they abandoned their group after the death of their breeding partner, when no other breeding opportunities were present; whereas dominant females that lost their partner remained and continued to breed in the same group. We show that a larger number of processes can terminate dominance tenure in males with the result that the average male tenure of breeding positions was shorter than that of females, which contributes to the reduced variance in the lifetime reproductive success in males compared to females. Our analysis suggests that sex differences in emigration and immigration may often have downstream consequences for sex differences in reproductive variance and for the selection pressures operating on females and males.</p>
Data and R code for: Linking climate variability to demography in cooperatively breeding meerkats
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Long-term movements and home range changes: rapid territory shifts in meerkats
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Data from: Androgens predict parasitism in female meerkats: a new perspective on a classic trade-off
Open the record for dataset details and reuse information.
Meerkat helpers buffer the detrimental effects of adverse environmental conditions on fecundity, growth and survival
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