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Prevalence of feral swine disturbance at important archaeological sites over a large landscape in Florida

Identifieur interne : 000040 ( Pmc/Curation ); précédent : 000039; suivant : 000041

Prevalence of feral swine disturbance at important archaeological sites over a large landscape in Florida

Auteurs : Richard M. Engeman [États-Unis] ; Joseph S. Meyer [États-Unis] ; John B. Allen [États-Unis]

Source :

RBID : PMC:5223124

Abstract

Feral swine are globally known as one of the most destructive invasive vertebrates, damaging native habitats, native plants and animals, agriculture, infrastructure, spreading diseases. There has been little quantification on their disturbance to archaeological sites across a broad landscape. Over 6 years we inspected 293 significant archaeological sites for swine disturbance across a vast area. We found a 42% prevalence of swine disturbance among all sites, with prevalence not distinguishable among prehistoric sites, historic sites, and sites with both components. The areas of disturbance mapped within three historic homestead sites showed 5–26% of total site surface area rooted. Disturbance was not evident upon re-inspection of one of these sites after 18 months, indicating how evidence of disturbance can be obscured in this environment. Thus, our observed 42% prevalence of disturbance should be considered a minimum for disturbance occurring through time. Artifacts depths were <10 cm of the surface at 85% of the sites and <20 cm of the surface for 90% of the sites. Feral swine rooting commonly exceeds 20 cm in depth, especially in soft sandy substrates typical of Florida, making the great majority of the studied sites highly vulnerable to artifact damage or displacement.


Url:
DOI: 10.1038/srep40287
PubMed: 28071758
PubMed Central: 5223124

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<p>Feral swine are globally known as one of the most destructive invasive vertebrates, damaging native habitats, native plants and animals, agriculture, infrastructure, spreading diseases. There has been little quantification on their disturbance to archaeological sites across a broad landscape. Over 6 years we inspected 293 significant archaeological sites for swine disturbance across a vast area. We found a 42% prevalence of swine disturbance among all sites, with prevalence not distinguishable among prehistoric sites, historic sites, and sites with both components. The areas of disturbance mapped within three historic homestead sites showed 5–26% of total site surface area rooted. Disturbance was not evident upon re-inspection of one of these sites after 18 months, indicating how evidence of disturbance can be obscured in this environment. Thus, our observed 42% prevalence of disturbance should be considered a minimum for disturbance occurring through time. Artifacts depths were <10 cm of the surface at 85% of the sites and <20 cm of the surface for 90% of the sites. Feral swine rooting commonly exceeds 20 cm in depth, especially in soft sandy substrates typical of Florida, making the great majority of the studied sites highly vulnerable to artifact damage or displacement.</p>
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<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Sci Rep</journal-id>
<journal-id journal-id-type="iso-abbrev">Sci Rep</journal-id>
<journal-title-group>
<journal-title>Scientific Reports</journal-title>
</journal-title-group>
<issn pub-type="epub">2045-2322</issn>
<publisher>
<publisher-name>Nature Publishing Group</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">28071758</article-id>
<article-id pub-id-type="pmc">5223124</article-id>
<article-id pub-id-type="pii">srep40287</article-id>
<article-id pub-id-type="doi">10.1038/srep40287</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Article</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Prevalence of feral swine disturbance at important archaeological sites over a large landscape in Florida</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Engeman</surname>
<given-names>Richard M.</given-names>
</name>
<xref ref-type="corresp" rid="c1">a</xref>
<xref ref-type="aff" rid="a1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Meyer</surname>
<given-names>Joseph S.</given-names>
</name>
<xref ref-type="aff" rid="a2">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Allen</surname>
<given-names>John B.</given-names>
</name>
<xref ref-type="aff" rid="a3">3</xref>
</contrib>
<aff id="a1">
<label>1</label>
<institution>National Wildlife Research Center</institution>
, 4101 LaPorte Ave, Fort Collins, CO 80521-2154,
<country>USA</country>
</aff>
<aff id="a2">
<label>2</label>
<institution>96 CEG/CEIEA, Building 696</institution>
, 501 De Leon St., Eglin AFB, FL 32542,
<country>USA</country>
</aff>
<aff id="a3">
<label>3</label>
<institution>USDA/APHIS/WS, 2820 East University Ave.</institution>
, Gainesville, FL 32641,
<country>USA</country>
</aff>
</contrib-group>
<author-notes>
<corresp id="c1">
<label>a</label>
<email>richard.m.engeman@aphis.usda.gov</email>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>10</day>
<month>01</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="collection">
<year>2017</year>
</pub-date>
<volume>7</volume>
<elocation-id>40287</elocation-id>
<history>
<date date-type="received">
<day>16</day>
<month>08</month>
<year>2016</year>
</date>
<date date-type="accepted">
<day>29</day>
<month>11</month>
<year>2016</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright © 2017, The Author(s)</copyright-statement>
<copyright-year>2017</copyright-year>
<copyright-holder>The Author(s)</copyright-holder>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0/">
<pmc-comment>author-paid</pmc-comment>
<license-p>This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>
</license-p>
</license>
</permissions>
<abstract>
<p>Feral swine are globally known as one of the most destructive invasive vertebrates, damaging native habitats, native plants and animals, agriculture, infrastructure, spreading diseases. There has been little quantification on their disturbance to archaeological sites across a broad landscape. Over 6 years we inspected 293 significant archaeological sites for swine disturbance across a vast area. We found a 42% prevalence of swine disturbance among all sites, with prevalence not distinguishable among prehistoric sites, historic sites, and sites with both components. The areas of disturbance mapped within three historic homestead sites showed 5–26% of total site surface area rooted. Disturbance was not evident upon re-inspection of one of these sites after 18 months, indicating how evidence of disturbance can be obscured in this environment. Thus, our observed 42% prevalence of disturbance should be considered a minimum for disturbance occurring through time. Artifacts depths were <10 cm of the surface at 85% of the sites and <20 cm of the surface for 90% of the sites. Feral swine rooting commonly exceeds 20 cm in depth, especially in soft sandy substrates typical of Florida, making the great majority of the studied sites highly vulnerable to artifact damage or displacement.</p>
</abstract>
</article-meta>
</front>
<floats-group>
<fig id="f1">
<label>Figure 1</label>
<caption>
<title>Map showing the portion of site 8OK163 disturbed by feral swine, a 1905 homestead on Eglin Air Force Base, Florida.</title>
<p>The area of disturbance within this 5186 m
<sup>2</sup>
site was 774 m
<sup>2</sup>
, or 15% of the total site area. The map was created using a Trimble Nomad GPS with 3 m accuracy (
<ext-link ext-link-type="uri" xlink:href="https://store.trimble.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10125">https://store.trimble.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10125</ext-link>
), loaded with ArcPad 10.2 (
<ext-link ext-link-type="uri" xlink:href="http://www.esri.com/software/arcgis/arcpad/">http://www.esri.com/software/arcgis/arcpad/</ext-link>
). Data were imported into ArcMap 10.2.2 (
<ext-link ext-link-type="uri" xlink:href="http://desktop.arcgis.com/en/arcmap/">http://desktop.arcgis.com/en/arcmap/</ext-link>
) to carry out calculations.</p>
</caption>
<graphic xlink:href="srep40287-f1"></graphic>
</fig>
<fig id="f2">
<label>Figure 2</label>
<caption>
<title>Map showing the portion of site 8OK1062 disturbed by feral swine, a 1905 homestead on Eglin Air Force Base, Florida.</title>
<p>The area of disturbance within this 12716 m
<sup>2</sup>
site was 648 m
<sup>2</sup>
, or 5% of the total site area. Note that one of the five mapped patches of swine disturbance was only tangential and outside the site limits and not included in calculations for area of disturbance. The map was created using a Trimble Nomad GPS with 3 m accuracy (
<ext-link ext-link-type="uri" xlink:href="https://store.trimble.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10125">https://store.trimble.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10125</ext-link>
), loaded with ArcPad 10.2 (
<ext-link ext-link-type="uri" xlink:href="http://www.esri.com/software/arcgis/arcpad/">http://www.esri.com/software/arcgis/arcpad/</ext-link>
). Data were imported into ArcMap 10.2.2 (
<ext-link ext-link-type="uri" xlink:href="http://desktop.arcgis.com/en/arcmap/">http://desktop.arcgis.com/en/arcmap/</ext-link>
) to carry out calculations.</p>
</caption>
<graphic xlink:href="srep40287-f2"></graphic>
</fig>
<fig id="f3">
<label>Figure 3</label>
<caption>
<title>Map showing the portion of site 8WL1471 disturbed by feral swine, a 1904 homestead on Eglin Air Force Base, Florida.</title>
<p>The area of disturbance within this 5881 m
<sup>2</sup>
site was 1529 m
<sup>2</sup>
, or 26% of the total site area. The map was created using a Trimble Nomad GPS with 3 m accuracy (
<ext-link ext-link-type="uri" xlink:href="https://store.trimble.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10125">https://store.trimble.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=10125</ext-link>
), loaded with ArcPad 10.2 (
<ext-link ext-link-type="uri" xlink:href="http://www.esri.com/software/arcgis/arcpad/">http://www.esri.com/software/arcgis/arcpad/</ext-link>
). Data were imported into ArcMap 10.2.2 (
<ext-link ext-link-type="uri" xlink:href="http://desktop.arcgis.com/en/arcmap/">http://desktop.arcgis.com/en/arcmap/</ext-link>
) to carry out calculations.</p>
</caption>
<graphic xlink:href="srep40287-f3"></graphic>
</fig>
<fig id="f4">
<label>Figure 4</label>
<caption>
<title>Bricks displaced (outlined) by feral swine rooting at site 8WL1471, a 1905 homestead on Eglin Air Force Base, Florida.</title>
<p>(Photo by J. Meyer).</p>
</caption>
<graphic xlink:href="srep40287-f4"></graphic>
</fig>
<table-wrap position="float" id="t1">
<label>Table 1</label>
<caption>
<title>Distribution by age category of feral swine disturbance among 293 archaeological sites eligible for the U.S. National Register of Historic Places on Eglin Air Force Base.</title>
</caption>
<table frame="hsides" rules="groups" border="1">
<colgroup>
<col align="left"></col>
<col align="center"></col>
<col align="center"></col>
<col align="center"></col>
<col align="center"></col>
</colgroup>
<thead valign="bottom">
<tr>
<th align="left" valign="top" charoff="50">Age category</th>
<th align="center" valign="top" charoff="50">Number observed</th>
<th align="center" valign="top" charoff="50">Number with swine disturbance (%)</th>
<th align="center" valign="top" charoff="50">Number with artifacts ≤10 cm of surface (%)</th>
<th align="center" valign="top" charoff="50">Number with artifacts ≤20 cm of surface (%)</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td align="left" valign="top" charoff="50">Prehistoric</td>
<td align="center" valign="top" charoff="50">104</td>
<td align="center" valign="top" charoff="50">39 (38%)</td>
<td align="center" valign="top" charoff="50">78 (75%)</td>
<td align="center" valign="top" charoff="50">91 (88%)</td>
</tr>
<tr>
<td align="left" valign="top" charoff="50">Historic</td>
<td align="center" valign="top" charoff="50">103</td>
<td align="center" valign="top" charoff="50">50 (49%)</td>
<td align="center" valign="top" charoff="50">87 (87%)</td>
<td align="center" valign="top" charoff="50">88 (86%)</td>
</tr>
<tr>
<td align="left" valign="top" charoff="50">Prehistoric and historic components</td>
<td align="center" valign="top" charoff="50">86</td>
<td align="center" valign="top" charoff="50">33 (38%)</td>
<td align="center" valign="top" charoff="50">82 (96%)</td>
<td align="center" valign="top" charoff="50">82 (96%)</td>
</tr>
<tr>
<td align="left" valign="top" charoff="50">Total</td>
<td align="center" valign="top" charoff="50">293</td>
<td align="center" valign="top" charoff="50">122 (42%)</td>
<td align="center" valign="top" charoff="50">247 (85%)</td>
<td align="center" valign="top" charoff="50">261 (90%)</td>
</tr>
</tbody>
</table>
</table-wrap>
</floats-group>
</pmc>
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