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The purpose of this digital data set is to delimit the current distribution of 2 species of Joshua Tree, (Yucca brevifolia and Yucca jaegeriana). |
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The purpose of this digital data set is to delimit the current distribution of 2 species of Joshua Tree, (Yucca brevifolia and Yucca jaegeriana). |
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US Fish and Wildlife Service; Center for Conservation Biology; UC Riverside; National Park Service, Joshua Tree National Park; iNaturalist; Bureau of Land Management; Jepson Herbarium; USGS Southwest Biological Service Center; Grand Canyon-Parashant National Monument; Godsoe et al, 2009; SEINet; California Deparment of Fish and Wildlife; Fort Irwin; Edwards Air Force Base. |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>We used existing information to convey the general boundary and geographical limits of where Joshua trees occur on the landscape, as represented by polygons. The existing information comes from a number of sources, but primarily from Rowlands (1978, entire), Cole </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>et al. </SPAN></SPAN><SPAN><SPAN>(2003, entire and 2011, entire) and Godsoe </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>et al. </SPAN></SPAN><SPAN><SPAN>(2009, entire). The polygon maps were verified using Godsoe </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>et al</SPAN></SPAN><SPAN><SPAN>. (2009, p. 592) who mapped 5,767 presence points across the Joshua tree range. Cole’s 2003 distribution mapping was updated in 2011 using presence points recorded in plots contained within the LANDFIRE Reference Database (2007, entire), the Central Mojave field data (Thomas </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>et al. </SPAN></SPAN><SPAN><SPAN>2002, entire), and the Beatley Plots (Webb </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>et al. </SPAN></SPAN><SPAN>2003, entire). The Service’s distribution map also incorporates a number of additional datasets (e.g., SEINet, Consortium of California Herbaria) that were combined to create the most likely distribution, or range boundary. The Service will continue to refine the polygon boundaries as more information is received on current Joshua tree distribution. </SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The GIS files and their associated coordinates are not the legal source for determining the critical habitat boundaries of species described in this dataset, but are used to identify areas which contain the physical and biological features essential to the conservation of the species or areas otherwise determined to be essential. Inherent in any dataset used to develop graphical representations, are limitations of accuracy as determined, among others, the source, scale and resolution of the data. While the U.S. Fish and Wildlife Service makes every effort to represent the critical habitat shown with data as completely and accurately as possible (given existing time and resource constraints), the USFWS gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. In addition, the USFWS shall not be held liable for improper or incorrect use of the data described and/or contained herein. Graphical representations provided by the use of these data do not represent a legal description of the critical habitat boundary. The user is referred to the critical habitat textual description in the appropriate final rule for this species as published in the Federal Register. These data are to be used only in the context of the definition and purpose of critical habitat. This primarily relates to Section 7 consultation under the Endangered Species Act. These data may be used for planning and land management purposes. They are not to be used for legal survey use. Please refer to Federal Register Citation Number 73FR50454, published 20080826 for the legal critical habitat information.</SPAN></P></DIV></DIV></DIV> |
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| title:
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Current Distribution of two species of Joshua tree (Yucca brevifolia and Yucca jaegeriana) |
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["Joshua tree","Yucca brevifolia","Yucca jaegeriana","Distribution","Range","Yucca","brevifolia","jaegeriana"] |
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en-US |
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150000000 |
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