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140 lines
22 KiB
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<document ID-DOI="10.7717/peerj.4417" ID-GBIF-Dataset="58039a1f-b9d0-4c93-b627-410c6decc440" ID-PMC="PMC5822849" ID-PubMed="29479504" ID-Zenodo-Dep="3097200" checkinTime="1519205475471" checkinUser="plazi" docAuthor="Jonathan P. Tennant, Alfio Alessandro Chiarenza & Matthew Baron" docDate="2018" docId="03FE9007FFAA831EFE21F8BD78D9D7EB" docLanguage="en" docName="peerj-4417.pdf" docOrigin="PeerJ 4417" docStyle="DocumentStyle{}" docTitle="Sauropodomorpha" docType="treatment" docVersion="10" lastPageNumber="20" masterDocId="FFC7E87FFFBA830AFFD3FFB17D18D113" masterDocTitle="How has our knowledge of dinosaur diversity through geologic time changed through research history?" masterLastPageNumber="42" masterPageNumber="1" pageNumber="17" updateTime="1668138782670" updateUser="ExternalLinkService">
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<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
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<mods:titleInfo>
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<mods:title>How has our knowledge of dinosaur diversity through geologic time changed through research history?</mods:title>
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</mods:titleInfo>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Jonathan P. Tennant</mods:namePart>
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</mods:name>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Alfio Alessandro Chiarenza</mods:namePart>
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</mods:name>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Matthew Baron</mods:namePart>
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</mods:name>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:title>PeerJ</mods:title>
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<mods:part>
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<mods:date>2018</mods:date>
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<mods:detail type="pubDate">
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<mods:number>2018-02-19</mods:number>
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<mods:detail type="volume">
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<mods:number>4417</mods:number>
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<mods:start>1</mods:start>
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<mods:end>42</mods:end>
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<mods:classification>journal article</mods:classification>
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<mods:identifier type="DOI">10.7717/peerj.4417</mods:identifier>
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<mods:identifier type="GBIF-Dataset">58039a1f-b9d0-4c93-b627-410c6decc440</mods:identifier>
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<mods:identifier type="PMC">PMC5822849</mods:identifier>
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<mods:identifier type="PubMed">29479504</mods:identifier>
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<treatment ID-DOI="http://doi.org/10.5281/zenodo.5614768" ID-GBIF-Taxon="141118106" ID-Zenodo-Dep="5614768" LSID="urn:lsid:plazi:treatment:03FE9007FFAA831EFE21F8BD78D9D7EB" httpUri="http://treatment.plazi.org/id/03FE9007FFAA831EFE21F8BD78D9D7EB" lastPageId="20" lastPageNumber="20" pageId="16" pageNumber="17">
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<subSubSection box="[498,757,1804,1832]" pageId="16" pageNumber="17" type="nomenclature">
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<paragraph blockId="16.[498,1518,1804,1915]" box="[498,757,1804,1832]" pageId="16" pageNumber="17">
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<heading bold="true" box="[498,757,1804,1832]" fontSize="11" level="4" pageId="16" pageNumber="17" reason="6">
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<taxonomicName box="[498,757,1804,1832]" class="Reptilia" kingdom="Animalia" order="Saurischia" pageId="16" pageNumber="17" phylum="Chordata" rank="subOrder" subOrder="Sauropodomorpha">
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<emphasis bold="true" box="[498,757,1804,1832]" italics="true" pageId="16" pageNumber="17">Sauropodomorphs</emphasis>
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</taxonomicName>
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</heading>
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</paragraph>
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</subSubSection>
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<subSubSection lastPageId="20" lastPageNumber="21" pageId="16" pageNumber="17" type="discussion">
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<paragraph blockId="16.[498,1518,1804,1915]" pageId="16" pageNumber="17">
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Sauropodomorph empirical diversity emphasises some more changes in raw patterns through publication time, particularly in the ‘middle’ and Late Cretaceous (
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<figureCitation box="[1401,1500,1888,1915]" captionStart="Figure 11" captionStartId="18.[116,180,1302,1324]" captionTargetBox="[92,1502,236,1272]" captionTargetId="figure@18.[90,1504,234,1274]" captionTargetPageId="18" captionText="Figure 11 RaW saurOpOdOmOrph diVersity at (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-11" httpUri="https://zenodo.org/record/3097256/files/figure.png" pageId="16" pageNumber="17">Fig. 11A</figureCitation>
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).
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</paragraph>
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<caption httpUri="https://zenodo.org/record/3097250/files/figure.png" pageId="17" pageNumber="18" startId="17.[116,180,1302,1324]" targetBox="[92,1496,236,1272]" targetPageId="17">
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<paragraph blockId="17.[116,1515,1302,1353]" pageId="17" pageNumber="18">
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<emphasis bold="true" pageId="17" pageNumber="18">
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Figure 10 Good’s
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<emphasis bold="true" box="[295,308,1302,1324]" italics="true" pageId="17" pageNumber="18">u</emphasis>
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estimates for theropods at (A) global and (B–F) regional levels (Europe, Africa, Asia, North America, and South America, respectively) based on our published knowledge in 1991 and 2015.
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</emphasis>
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Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-10
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</paragraph>
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</caption>
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<paragraph blockId="17.[498,1542,1417,1922]" pageId="17" pageNumber="18">
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Late Jurassic patterns are fairly consistent, with a rising Kimmeridgian and Tithonian raw diversity emphasising an apparent major decline across the J/K interval. In Europe, sauropods show a consistent and major decline in raw diversity from the Kimmeridgian to the Berriasian (
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<figureCitation box="[682,779,1537,1564]" captionStart="Figure 11" captionStartId="18.[116,180,1302,1324]" captionTargetBox="[92,1502,236,1272]" captionTargetId="figure@18.[90,1504,234,1274]" captionTargetPageId="18" captionText="Figure 11 RaW saurOpOdOmOrph diVersity at (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-11" httpUri="https://zenodo.org/record/3097256/files/figure.png" pageId="17" pageNumber="18">Fig. 11B</figureCitation>
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). Much of the rest of the Cretaceous is too poorly sampled, but raw sauropod diversity never attains Kimmeridgian levels in Europe for the rest of their evolutionary history. Sauropodomorph dinosaurs are generally better sampled than theropods and ornithischians in Africa, showing an apparent decline through the Triassic/ Jurassic transition, a latest Jurassic raw diversity peak, and low levels through the ‘middle’ to Late Cretaceous transition (
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<figureCitation box="[855,953,1736,1763]" captionStart="Figure 11" captionStartId="18.[116,180,1302,1324]" captionTargetBox="[92,1502,236,1272]" captionTargetId="figure@18.[90,1504,234,1274]" captionTargetPageId="18" captionText="Figure 11 RaW saurOpOdOmOrph diVersity at (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-11" httpUri="https://zenodo.org/record/3097256/files/figure.png" pageId="17" pageNumber="18">Fig. 11C</figureCitation>
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). In Asia, raw taxonomic diversity is generally low compared to the Maastrichtian, in which diversity is relatively high and still rapidly increasing through publication history (
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<figureCitation box="[969,1070,1816,1843]" captionStart="Figure 11" captionStartId="18.[116,180,1302,1324]" captionTargetBox="[92,1502,236,1272]" captionTargetId="figure@18.[90,1504,234,1274]" captionTargetPageId="18" captionText="Figure 11 RaW saurOpOdOmOrph diVersity at (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-11" httpUri="https://zenodo.org/record/3097256/files/figure.png" pageId="17" pageNumber="18">Fig. 11D</figureCitation>
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). The North American sauropod record is very patchy, with the latest Jurassic showing a shift from rapidly increasing raw diversity from the Oxfordian to a slight drop from the Kimmeridgian to Tithonian (
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<figureCitation box="[1396,1492,1895,1922]" captionStart="Figure 11" captionStartId="18.[116,180,1302,1324]" captionTargetBox="[92,1502,236,1272]" captionTargetId="figure@18.[90,1504,234,1274]" captionTargetPageId="18" captionText="Figure 11 RaW saurOpOdOmOrph diVersity at (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-11" httpUri="https://zenodo.org/record/3097256/files/figure.png" pageId="17" pageNumber="18">Fig. 11E</figureCitation>
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).
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</paragraph>
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<caption httpUri="https://zenodo.org/record/3097256/files/figure.png" pageId="18" pageNumber="19" startId="18.[116,180,1302,1324]" targetBox="[92,1502,236,1272]" targetPageId="18">
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<paragraph blockId="18.[116,1515,1302,1353]" pageId="18" pageNumber="19">
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<emphasis bold="true" pageId="18" pageNumber="19">Figure 11 Raw sauropodomorph diversity at (A) global and (B–F) regional levels (Europe, Africa, Asia, North America, and South America, respectively) based on our published knowledge in 1991 and 2015.</emphasis>
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Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-11
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</paragraph>
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</caption>
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<paragraph blockId="18.[498,1542,1418,1923]" lastBlockId="19.[498,1542,1457,1923]" lastPageId="19" lastPageNumber="20" pageId="18" pageNumber="19">
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The South American Jurassic sauropod record is patchy, but raw diversity is increasing throughout the ‘middle’ to Late Cretaceous through publication history (
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<figureCitation box="[1371,1466,1458,1485]" captionStart="Figure 11" captionStartId="18.[116,180,1302,1324]" captionTargetBox="[92,1502,236,1272]" captionTargetId="figure@18.[90,1504,234,1274]" captionTargetPageId="18" captionText="Figure 11 RaW saurOpOdOmOrph diVersity at (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-11" httpUri="https://zenodo.org/record/3097256/files/figure.png" pageId="18" pageNumber="19">Fig. 11F</figureCitation>
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). At a ‘global’ level, Jurassic sauropodomorph subsampled diversity remains consistent through publication history (
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<figureCitation box="[848,947,1537,1564]" captionStart="Figure 12" captionStartId="19.[116,180,1302,1324]" captionTargetBox="[92,1490,236,1272]" captionTargetId="figure@19.[90,1492,234,1274]" captionTargetPageId="19" captionText="Figure 12 Subsampled sauropodomorph diVersity at (A) global and (B–F) regional leVels (Europe, Africa, Asia, North America, and South America, respectiVely) based on our published knoWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-12" httpUri="https://zenodo.org/record/3097264/files/figure.png" pageId="18" pageNumber="19">Fig. 12A</figureCitation>
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). Here, we see steadily increasing diversity levels through the Middle and Late Jurassic, before a decline through the J/K transition, which might have been initiated before the J/K boundary itself. The greatest change in subsampled diversity is in the Albian, which has almost doubled in the last 20 years, with implication for the ‘mid-Cretaceous sauropod hiatus’ (
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<bibRefCitation author="Butler RJ & Benson RBJ & Carrano MT & Mannion PD & Upchurch P." box="[1152,1478,1697,1724]" journalOrPublisher="Proceedings of the RoYal SocietY of London Series B: Biological Sciences" pageId="18" pageNumber="19" pagination="1165 - 1170" part="278" publicationUrl="10.1098/rspb.2010.1754." refId="ref15579" refString="Butler RJ, Benson RBJ, Carrano MT, Mannion PD, Upchurch P. 2011. Sea level, dinosaur diversity and sampling biases: investigating the ' common cause' hypothesis in the terrestrial realm. Proceedings of the RoYal SocietY of London Series B: Biological Sciences 278 (1709): 1165 - 1170 DOI 10.1098 / rspb. 2010.1754." title="Sea level, dinosaur diversity and sampling biases: investigating the ' common cause' hypothesis in the terrestrial realm" type="journal article" year="2011">
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<emphasis box="[1152,1478,1697,1724]" italics="true" pageId="18" pageNumber="19">Mannion & Upchurch, 2011</emphasis>
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</bibRefCitation>
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). Subsampling reduces the European diversity signal due to poor sampling of sauropods, although there is evidence for the sauropod decline beginning prior to the J/K transition (
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<figureCitation box="[509,607,1816,1843]" captionStart="Figure 12" captionStartId="19.[116,180,1302,1324]" captionTargetBox="[92,1490,236,1272]" captionTargetId="figure@19.[90,1492,234,1274]" captionTargetPageId="19" captionText="Figure 12 Subsampled sauropodomorph diVersity at (A) global and (B–F) regional leVels (Europe, Africa, Asia, North America, and South America, respectiVely) based on our published knoWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-12" httpUri="https://zenodo.org/record/3097264/files/figure.png" pageId="18" pageNumber="19">Fig. 12B</figureCitation>
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). In Africa, when subsampling is applied, the few intervals in which a signal emerges reveal a fairly constant level of diversity through the Jurassic and Cretaceous, and through publication time, with the notable exception being an increase in subsampled diversity in the latest Jurassic (
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<figureCitation box="[864,962,1457,1484]" captionStart="Figure 12" captionStartId="19.[116,180,1302,1324]" captionTargetBox="[92,1490,236,1272]" captionTargetId="figure@19.[90,1492,234,1274]" captionTargetPageId="19" captionText="Figure 12 Subsampled sauropodomorph diVersity at (A) global and (B–F) regional leVels (Europe, Africa, Asia, North America, and South America, respectiVely) based on our published knoWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-12" httpUri="https://zenodo.org/record/3097264/files/figure.png" pageId="19" pageNumber="20">Fig. 12C</figureCitation>
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). In Asia, the signal is also fairly poor after subsampling is applied (
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<figureCitation box="[781,880,1497,1524]" captionStart="Figure 12" captionStartId="19.[116,180,1302,1324]" captionTargetBox="[92,1490,236,1272]" captionTargetId="figure@19.[90,1492,234,1274]" captionTargetPageId="19" captionText="Figure 12 Subsampled sauropodomorph diVersity at (A) global and (B–F) regional leVels (Europe, Africa, Asia, North America, and South America, respectiVely) based on our published knoWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-12" httpUri="https://zenodo.org/record/3097264/files/figure.png" pageId="19" pageNumber="20">Fig. 12D</figureCitation>
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). Here, we see an increase in subsampled diversity across the Triassic/Jurassic transition, and the highest diversity level is in the Maastrichtian, where subsampled estimates have increased by more than double in the last 20 years. In North America, the subsampled signal is highly degraded, although of note is a near doubling of Albian diversity levels in the last 20 years (
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<figureCitation box="[1153,1250,1657,1684]" captionStart="Figure 12" captionStartId="19.[116,180,1302,1324]" captionTargetBox="[92,1490,236,1272]" captionTargetId="figure@19.[90,1492,234,1274]" captionTargetPageId="19" captionText="Figure 12 Subsampled sauropodomorph diVersity at (A) global and (B–F) regional leVels (Europe, Africa, Asia, North America, and South America, respectiVely) based on our published knoWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-12" httpUri="https://zenodo.org/record/3097264/files/figure.png" pageId="19" pageNumber="20">Fig. 12E</figureCitation>
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). In South America, the signal is very inconsistent, but improving through publication history, with a patchy Late Cretaceous signal beginning to emerge (
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<figureCitation box="[962,1054,1736,1763]" captionStart="Figure 12" captionStartId="19.[116,180,1302,1324]" captionTargetBox="[92,1490,236,1272]" captionTargetId="figure@19.[90,1492,234,1274]" captionTargetPageId="19" captionText="Figure 12 Subsampled sauropodomorph diVersity at (A) global and (B–F) regional leVels (Europe, Africa, Asia, North America, and South America, respectiVely) based on our published knoWledge in 1991 and 2015. Abbreviations as Fig. 4. Full-size DOI: 10.7717/peerj.4417/fig-12" httpUri="https://zenodo.org/record/3097264/files/figure.png" pageId="19" pageNumber="20">Fig. 12F</figureCitation>
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). Full subsampling results are provided in Supplemental Informations 7 and 8.
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</paragraph>
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<caption httpUri="https://zenodo.org/record/3097262/files/figure.png" pageId="19" pageNumber="20" startId="19.[116,180,1302,1324]" targetBox="[92,1490,236,1272]" targetPageId="19">
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<paragraph blockId="19.[116,1515,1302,1383]" pageId="19" pageNumber="20">
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<caption httpUri="https://zenodo.org/record/3097264/files/figure.png" pageId="19" pageNumber="20" startId="19.[116,180,1302,1324]" targetBox="[92,1490,236,1272]" targetPageId="19">
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<emphasis bold="true" pageId="19" pageNumber="20">Figure 12 Subsampled sauropodomorph diversity at (A) global and (B–F) regional levels (Europe, Africa, Asia, North America, and South America, respectively) based on our published knowledge in 1991 and 2015.</emphasis>
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Abbreviations as Fig. 4.
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</caption>
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Full-size DOI: 10.7717/peerj.4417/fig-12
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</paragraph>
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</caption>
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<paragraph blockId="19.[498,1542,1457,1923]" lastBlockId="20.[498,1542,1398,1784]" lastPageId="20" lastPageNumber="21" pageId="19" pageNumber="20">
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Sauropodomorph coverage varies greatly at the ‘global’ level, with high levels in the Triassic-Jurassic transition, the Middle and Late Jurassic (with the exception of the Callovian), and the Maastrichtian (
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<figureCitation box="[917,1016,1896,1923]" captionStart="Figure 13" captionStartId="20.[116,180,1302,1324]" captionTargetBox="[92,1477,236,1272]" captionTargetId="figure@20.[90,1479,234,1274]" captionTargetPageId="20" captionText="Figure 13 GOOd’s u estimates fOr saurOpOdOmOrphs at a (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig.4. Full-size DOI: 10.7717/peerj.4417/fig-13" httpUri="https://zenodo.org/record/3097266/files/figure.png" pageId="19" pageNumber="20">Fig. 13A</figureCitation>
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). As with theropods and ornithischians, however, this is a composite of a very patchy regional record. In Europe, coverage is high during the latest Triassic, Middle Jurassic, and Late Cretaceous, and this does not seem to have varied with publication time (
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<figureCitation box="[918,1016,1478,1505]" captionStart="Figure 13" captionStartId="20.[116,180,1302,1324]" captionTargetBox="[92,1477,236,1272]" captionTargetId="figure@20.[90,1479,234,1274]" captionTargetPageId="20" captionText="Figure 13 GOOd’s u estimates fOr saurOpOdOmOrphs at a (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig.4. Full-size DOI: 10.7717/peerj.4417/fig-13" httpUri="https://zenodo.org/record/3097266/files/figure.png" pageId="20" pageNumber="21">Fig. 13B</figureCitation>
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). In Africa, moderate levels of coverage also have not changed substantially since 1991 (
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<figureCitation box="[999,1096,1518,1545]" captionStart="Figure 13" captionStartId="20.[116,180,1302,1324]" captionTargetBox="[92,1477,236,1272]" captionTargetId="figure@20.[90,1479,234,1274]" captionTargetPageId="20" captionText="Figure 13 GOOd’s u estimates fOr saurOpOdOmOrphs at a (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig.4. Full-size DOI: 10.7717/peerj.4417/fig-13" httpUri="https://zenodo.org/record/3097266/files/figure.png" pageId="20" pageNumber="21">Fig. 13C</figureCitation>
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). In Asia, coverage is generally high in the Late Jurassic, but the Cretaceous record is incredibly poor with just two data points (Aptian and Maastrichtian;
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<figureCitation box="[829,930,1597,1624]" captionStart="Figure 13" captionStartId="20.[116,180,1302,1324]" captionTargetBox="[92,1477,236,1272]" captionTargetId="figure@20.[90,1479,234,1274]" captionTargetPageId="20" captionText="Figure 13 GOOd’s u estimates fOr saurOpOdOmOrphs at a (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig.4. Full-size DOI: 10.7717/peerj.4417/fig-13" httpUri="https://zenodo.org/record/3097266/files/figure.png" pageId="20" pageNumber="21">Fig. 13D</figureCitation>
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). In North America, the latest Jurassic has high coverage levels, which are increasing through publication history in the Kimmeridgian, and moderately high coverage in the Aptian and latest Cretaceous (
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<figureCitation box="[1300,1396,1677,1704]" captionStart="Figure 13" captionStartId="20.[116,180,1302,1324]" captionTargetBox="[92,1477,236,1272]" captionTargetId="figure@20.[90,1479,234,1274]" captionTargetPageId="20" captionText="Figure 13 GOOd’s u estimates fOr saurOpOdOmOrphs at a (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig.4. Full-size DOI: 10.7717/peerj.4417/fig-13" httpUri="https://zenodo.org/record/3097266/files/figure.png" pageId="20" pageNumber="21">Fig. 13E</figureCitation>
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). In South America, coverage is very patchy and inconsistent, with the only noteworthy change through publication history being an increase for the Rhaetian interval (
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<figureCitation box="[1360,1456,1757,1784]" captionStart="Figure 13" captionStartId="20.[116,180,1302,1324]" captionTargetBox="[92,1477,236,1272]" captionTargetId="figure@20.[90,1479,234,1274]" captionTargetPageId="20" captionText="Figure 13 GOOd’s u estimates fOr saurOpOdOmOrphs at a (A) glObal and (B–F) regiOnal leVels (EurOpe, Africa, Asia, NOrth America, and SOuth America, respectiVely) based On Our published knOWledge in 1991 and 2015. Abbreviations as Fig.4. Full-size DOI: 10.7717/peerj.4417/fig-13" httpUri="https://zenodo.org/record/3097266/files/figure.png" pageId="20" pageNumber="21">Fig. 13F</figureCitation>
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).
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</paragraph>
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</subSubSection>
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</treatment>
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</document> |