cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.25420709
title: Table S5: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Cross-study whole genome sequencing coverage data used in Figure 1A.
DOI: 10.6084/m9.figshare.25420709.v3
title: Table S5: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Cross-study whole genome sequencing coverage data used in Figure 1A.
DOI: 10.6084/m9.figshare.25420712
title: Table S1: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Metadata for 51 DFT1 tumours presented by Patton <i>et al</i>. [14].
DOI: 10.6084/m9.figshare.25420712.v2
title: Table S1: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Metadata for 51 DFT1 tumours presented by Patton <i>et al</i>. [14].
DOI: 10.6084/m9.figshare.25420715
title: Table S3: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Mutation density within a restricted genomic region (“clock-like genes”).Identifiers and coordinates of 15 genes defined as “clock-like” by Patton <i>et al</i>. [14] with 1:1 annotation mapping in mSarHar1.11 (Ensembl v105). Number of somatic mutations found within each gene interval among 78 DFT1 tumours analysed by Stammnitz <i>et al</i>. [7] is shown.
DOI: 10.6084/m9.figshare.25420715.v2
title: Table S3: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Mutation density within a restricted genomic region (“clock-like genes”).Identifiers and coordinates of 15 genes defined as “clock-like” by Patton <i>et al</i>. [14] with 1:1 annotation mapping in mSarHar1.11 (Ensembl v105). Number of somatic mutations found within each gene interval among 78 DFT1 tumours analysed by Stammnitz <i>et al</i>. [7] is shown.
DOI: 10.6084/m9.figshare.25420712.v1
title: Table S1 from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Metadata, aligned genome-wide coverage depth and purity of tumour samples from Patton et al, 2020.
DOI: 10.6084/m9.figshare.25420715.v1
title: Table S3 from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Somatic substitutions identified within the subset of all "clock-like genes" (Patton et al, 2020) matched between the DEVIL7.0 (2012) and mSarHar1.11 (2023) reference genomes.
DOI: 10.6084/m9.figshare.25420718
title: Table S6: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Viral, bacterial and mammalian mutation rate data used in Figure 1C.Mean mutation rates (mutation/site/year) are presented for each sample set. 95% Bayesian credible intervals (95% HPD) are presented for DFT1 datasets only.
DOI: 10.6084/m9.figshare.25420721.v2
title: Table S2: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Genotyping summary and clade assignment.Data for 51 DFT1 tumours presented by Patton <i>et al</i>. [14], as well as for 78 DFT1 tumours and 80 normal devil genomes presented by Stammnitz <i>et al</i>. [7] are shown. N denotes the number of clade-defining variants genotyped for each clade. Somatic variants were defined as “present” if ≥3 reads supporting the alternative allele were detected. False negative rate is estimated using the proportion of clade-defining variants that failed to be identified as “present” for the assigned clade. Full somatic variant subsets are listed in supplementary data S1.
DOI: 10.6084/m9.figshare.25420718.v1
title: Table S6 from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Summary of mutation rate estimates from studies of RNA viruses, DNA viruses, bacteria, mammalian normal cells and DFT1.
DOI: 10.6084/m9.figshare.25420721
title: Table S2: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Genotyping summary and clade assignment.Data for 51 DFT1 tumours presented by Patton <i>et al</i>. [14], as well as for 78 DFT1 tumours and 80 normal devil genomes presented by Stammnitz <i>et al</i>. [7] are shown. N denotes the number of clade-defining variants genotyped for each clade. Somatic variants were defined as “present” if ≥3 reads supporting the alternative allele were detected. False negative rate is estimated using the proportion of clade-defining variants that failed to be identified as “present” for the assigned clade. Full somatic variant subsets are listed in supplementary data S1.
DOI: 10.6084/m9.figshare.25420721.v1
title: Table S2 from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: DFT1 variant genotyping summary ("presence" defined as ?3 ALT supporting reads), including truncal and clade-specific mutations, in tumour cohorts presented by Patton et al (2020) and Stammnitz et al (2023).
DOI: 10.6084/m9.figshare.25420727
title: Table S4: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Copy number variants.Genome coordinates, relative to mSarHar1.11 [7], of 155 copy number variants (CNVs) identified in one or more DFT1 tumours presented by Patton <i>et al</i>. [14]. Each CNV is defined as a “gain” or “loss”. CNVs associated with the unstable marker 5 chromosome (“IsMarker5”) [6,7], or occurring on a region of chromosome 5 prone to copy number instability in DFT1 (“IsRecurrent”) are labelled. Genotypes for 48 tumours presented by Patton <i>et al</i>. [14] are shown (1, presence; 0, absence). Three tumours (SAMN14418891 [T-1560], SAMN14418906 [T-223262], SAMN14418921 [T-695064]) were excluded due to insufficient DFT1 sequencing coverage. Visualisation of autosomal absolute copy number profile for each tumour is presented in supplementary data S2.
DOI: 10.6084/m9.figshare.25420727.v2
title: Table S4: from No evidence that a transmissible cancer has shifted from emergence to endemism in Tasmanian devils

description: Copy number variants.Genome coordinates, relative to mSarHar1.11 [7], of 155 copy number variants (CNVs) identified in one or more DFT1 tumours presented by Patton <i>et al</i>. [14]. Each CNV is defined as a “gain” or “loss”. CNVs associated with the unstable marker 5 chromosome (“IsMarker5”) [6,7], or occurring on a region of chromosome 5 prone to copy number instability in DFT1 (“IsRecurrent”) are labelled. Genotypes for 48 tumours presented by Patton <i>et al</i>. [14] are shown (1, presence; 0, absence). Three tumours (SAMN14418891 [T-1560], SAMN14418906 [T-223262], SAMN14418921 [T-695064]) were excluded due to insufficient DFT1 sequencing coverage. Visualisation of autosomal absolute copy number profile for each tumour is presented in supplementary data S2.
DOI: 10.15468/dl.lclp9d
title: Occurrence Download

description: A dataset containing 5 species occurrences available in GBIF matching the query:
{
 "or" : [
 "TaxonKey is Pluchea glutinosa Balf.fil.",
 "TaxonKey is Bulbophyllum janus J.J.Verm."
 ]
}

 The dataset includes 5 records from 3 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024738-191105090559680/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.58cut6
title: Occurrence Download

description: A dataset containing 6 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ridleyandra kiewii (Kiew) A.Weber"
 ]
}

 The dataset includes 6 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0173753-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.9j6byj
title: Occurrence Download

description: A dataset containing 3 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Poa wendtii Soreng & P.M.Peterson"
 ]
}

 The dataset includes 3 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0185725-240321170329656/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.5k6tyf
title: Occurrence Download

description: A dataset containing 996 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Vesperus luridus (Rossi, 1794)"
 ]
}

 The dataset includes 996 records from 82 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0247725-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.bfdsil
title: Occurrence Download

description: A dataset containing 133166 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((120.22538304333098 14.244658950937733,120.22538304333098 10.244658950937733,124.22538304333098 10.244658950937733,124.22538304333098 14.244658950937733,120.22538304333098 14.244658950937733))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 133166 records from 256 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001990-170826194755519/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.huuswk
title: Occurrence Download

description: A dataset containing 477 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Dictyophleba lucida (K.Schum.) Pierre"
 ]
}

 The dataset includes 477 records from 28 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0173709-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.gdpcj5
title: Occurrence Download

description: A dataset containing 8 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Phialanthus linearis Alain"
 ]
}

 The dataset includes 8 records from 6 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0185724-240321170329656/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.xihgyg
title: Occurrence Download

description: A dataset containing 48 species occurrences available in GBIF matching the query:
{
 "and" : [
 "DatasetKey is UAZ Herpetology Collection",
 "TaxonKey is Phrynosoma ditmarsi Stejneger, 1906"
 ]
}

 The dataset includes 48 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001990-171002173027117/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.mrr9p9
title: Occurrence Download

description: A dataset containing 4730 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Amazona xantholora (G.R.Gray, 1859)"
 ]
}

 The dataset includes 4730 records from 39 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0247732-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.gqdfh4
title: Occurrence Download

description: A dataset containing 1007 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Emberiza fucata Pallas, 1776",
 "Year 2021-2022"
 ]
}

 The dataset includes 1007 records from 3 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0173725-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.d24kae
title: Occurrence Download

description: A dataset containing 596 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Chilodus punctatus Müller & Troschel, 1844"
 ]
}

 The dataset includes 596 records from 56 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0247745-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.rphrgl
title: Occurrence Download

description: A dataset containing 12 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ptychoglossus vallensis Harris, 1994"
 ]
}

 The dataset includes 12 records from 5 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001990-171020152545675/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.caadfw
title: Occurrence Download

description: A dataset containing 97 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Didissandra elongata (Jack) C.B.Clarke"
 ]
}

 The dataset includes 97 records from 9 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0173749-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.ggv9ju
title: Occurrence Download

description: A dataset containing 215 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Corydoras nattereri Steindachner, 1876"
 ]
}

 The dataset includes 215 records from 21 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0247763-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.lgovrx
title: Occurrence Download

description: A dataset containing 14398 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Ambystoma tigrinum (Green, 1825)"
 ]
}

 The dataset includes 14398 records from 110 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001990-171219132708484/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.kkk5j6
title: Occurrence Download

description: A dataset containing 3 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Didissandra ternata (Miq.) A.Weber & B.L.Burtt"
 ]
}

 The dataset includes 3 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0173757-230224095556074/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.5kbm3s
title: Occurrence Download

description: A dataset containing 237 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Cercocarpus fothergilloides Kunth"
 ]
}

 The dataset includes 237 records from 21 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001991-150316153013904/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.spgcqn
title: Occurrence Download

description: A dataset containing 229 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Escallonia revoluta (Ruiz & Pav.) Pers."
 ]
}

 The dataset includes 229 records from 33 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0247771-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.muq328
title: Occurrence Download

description: A dataset containing 7 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Psacalium pinetorum (Standl. & Steyerm.) Cuatrec."
 ]
}

 The dataset includes 7 records from 6 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0185726-240321170329656/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.wgs83g
title: Occurrence Download

description: A dataset containing 11 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Astragalus namanganicus Popov"
 ]
}

 The dataset includes 11 records from 8 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0034328-240229165702484/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.nfe5ak
title: Occurrence Download

description: A dataset containing 29130 species occurrences available in GBIF matching the query:
{
 "Country" : [
 "is Jordan"
 ]
}

 The dataset includes 29130 records from 216 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001991-151016162008034/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.sg679h
title: Occurrence Download

description: A dataset containing 55 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Dawkinsia arulius (Jerdon, 1849)"
 ]
}

 The dataset includes 55 records from 14 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0247786-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.4r6pcw
title: Occurrence Download

description: A dataset containing 43 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Corylopsis velutina Hand.-Mazz."
 ]
}

 The dataset includes 43 records from 7 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001637-240216155721649/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48597/e5zw-5c7h
title: Measurement of Precipitation_amount at Birkenes

description: Measurement of Precipitation_amount at Birkenes
DOI: 10.48597/ehf7-hrjw
title: Measurement of Aerosol_absorption_coefficient at Egbert

description: Measurement of Aerosol_absorption_coefficient at Egbert
DOI: 10.48597/evp3-rr3j
title: Measurement of Aerosol light scattering at Alert

description: Measurement of Aerosol light scattering at Alert
DOI: 10.48597/fhth-frqc
title: Measurement of Lead at Kårvatn

description: Measurement of Lead at Kårvatn
DOI: 10.48597/fjxb-g88z
title: Measurement of Aerosol light scattering at Egbert

description: Measurement of Aerosol light scattering at Egbert
DOI: 10.48597/fxet-fy46
title: Measurement of Zinc at Kårvatn

description: Measurement of Zinc at Kårvatn
DOI: 10.48597/fzn3-ajb6
title: Measurement of Lead at Kårvatn

description: Measurement of Lead at Kårvatn
DOI: 10.48597/g84z-w99t
title: Measurement of Ozone at Kamenicki vis

description: Measurement of Ozone at Kamenicki vis
DOI: 10.48597/g8n4-vaar
title: Measurement of Precipitation_amount at Birkenes

description: Measurement of Precipitation_amount at Birkenes
DOI: 10.48597/gfaa-4nzn
title: Measurement of Lead at Kårvatn

description: Measurement of Lead at Kårvatn
DOI: 10.48597/hvju-htpe
title: Measurement of Precipitation_amount at Kårvatn

description: Measurement of Precipitation_amount at Kårvatn
DOI: 10.48597/j73x-vbq6
title: Measurement of Lead at Kårvatn

description: Measurement of Lead at Kårvatn
DOI: 10.48597/jcw7-4yuj
title: Measurement of Precipitation_amount at Birkenes

description: Measurement of Precipitation_amount at Birkenes
DOI: 10.48597/jdsd-ku2d
title: Measurement of POPs (persistent organic pollutants) at Birkenes II

description: Measurement of POPs (persistent organic pollutants) at Birkenes II
DOI: 10.48597/jfs6-wp9y
title: Measurement of Cadmium at Kårvatn

description: Measurement of Cadmium at Kårvatn
DOI: 10.48597/jjwm-ju6s
title: Measurement of Precipitation_amount at Hurdal

description: Measurement of Precipitation_amount at Hurdal
DOI: 10.48597/jmmr-guvq
title: Measurement of Aerosol_absorption_coefficient at Egbert

description: Measurement of Aerosol_absorption_coefficient at Egbert
DOI: 10.48597/jp6s-kc8j
title: Measurement of Precipitation_amount at Hurdal

description: Measurement of Precipitation_amount at Hurdal
DOI: 10.48597/jptj-cts7
title: Measurement of Cadmium at Kårvatn

description: Measurement of Cadmium at Kårvatn
DOI: 10.48597/jtcy-saxe
title: Measurement of Aerosol light scattering at Egbert

description: Measurement of Aerosol light scattering at Egbert
DOI: 10.48597/jwsm-tcxa
title: Measurement of Aerosol light scattering at Gosan

description: Measurement of Aerosol light scattering at Gosan
DOI: 10.48597/jx5t-hnqp
title: Measurement of Aerosol light scattering at Egbert

description: Measurement of Aerosol light scattering at Egbert
DOI: 10.48597/k3s2-d3yt
title: Measurement of Aerosol light scattering at Gosan

description: Measurement of Aerosol light scattering at Gosan
DOI: 10.48597/kjq6-f654
title: Measurement of Zinc at Kårvatn

description: Measurement of Zinc at Kårvatn
DOI: 10.48597/kkdy-ya24
title: Measurement of Aerosol light scattering at Gosan

description: Measurement of Aerosol light scattering at Gosan
DOI: 10.48597/m7s8-w3yb
title: Measurement of Aerosol light scattering at Gosan

description: Measurement of Aerosol light scattering at Gosan
DOI: 10.48597/mnee-jexk
title: Measurement of POPs (persistent organic pollutants) at Birkenes II

description: Measurement of POPs (persistent organic pollutants) at Birkenes II
DOI: 10.48597/nccb-rf3t
title: Measurement of Cadmium at Kårvatn

description: Measurement of Cadmium at Kårvatn
DOI: 10.48597/nsew-wu8c
title: Measurement of Zinc at Kårvatn

description: Measurement of Zinc at Kårvatn
DOI: 10.48597/p6vu-6qdu
title: Measurement of Precipitation_amount at Birkenes

description: Measurement of Precipitation_amount at Birkenes
DOI: 10.48597/pbyv-e6nd
title: Measurement of Precipitation_amount at Birkenes

description: Measurement of Precipitation_amount at Birkenes
DOI: 10.48597/psav-qd6j
title: Measurement of Cadmium at Kårvatn

description: Measurement of Cadmium at Kårvatn
DOI: 10.48597/pvgh-44jv
title: Measurement of Precipitation_amount at Birkenes

description: Measurement of Precipitation_amount at Birkenes
DOI: 10.48597/q3bj-mcdj
title: Measurement of Cadmium at Kårvatn

description: Measurement of Cadmium at Kårvatn
DOI: 10.48597/q9n3-83zc
title: Measurement of Aerosol light scattering at Alert

description: Measurement of Aerosol light scattering at Alert
DOI: 10.48597/qatj-cwpd
title: Measurement of Precipitation_amount at Kårvatn

description: Measurement of Precipitation_amount at Kårvatn
DOI: 10.48597/qghe-g74q
title: Measurement of Aerosol_absorption_coefficient at Egbert

description: Measurement of Aerosol_absorption_coefficient at Egbert
DOI: 10.48597/qher-pmab
title: Measurement of Precipitation_amount at Hurdal

description: Measurement of Precipitation_amount at Hurdal
DOI: 10.48597/qshr-5n5k
title: Measurement of Cadmium at Kårvatn

description: Measurement of Cadmium at Kårvatn
DOI: 10.48597/rahc-qyq5
title: Measurement of Heavy metals at Birkenes

description: Measurement of Heavy metals at Birkenes
DOI: 10.48597/rfpd-fyb8
title: Measurement of Zinc at Kårvatn

description: Measurement of Zinc at Kårvatn
DOI: 10.48597/rtbj-u35w
title: Measurement of Precipitation_amount at Kårvatn

description: Measurement of Precipitation_amount at Kårvatn
DOI: 10.48597/rxgn-kcgq
title: Measurement of Lead at Kårvatn

description: Measurement of Lead at Kårvatn