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3 results for “Fractal sampling”
Data from: Fractal triads efficiently sample ecological diversity and processes across spatial scales
<p>The relative influence of ecological assembly processes, such as environmental filtering, competition, and dispersal, vary across spatial scales. Changes in phylogenetic and taxonomic diversity across environments provide insight into these processes, however, it is challenging to assess the effect of spatial scale on these metrics. Here, we outline a nested sampling design that fractally spaces sampling locations to concentrate statistical power across spatial scales in a study area. We test this design in northeast Utah, at a study site with distinct vegetation types (including sagebrush steppe and mixed conifer forest), that vary across environmental gradients. We demonstrate the power of this design to detect changes in community phylogenetic diversity across environmental gradients and assess the spatial scale at which the sampling design captures the most variation in empirical data. We find clear evidence of broad-scale changes in multiple features of phylogenetic and taxonomic diversity across aspect. At finer scales, we find additional variation in phylodiversity, highlighting the power of our fractal sampling design to efficiently detect patterns across multiple spatial scales. Thus, our fractal sampling design and analysis effectively identify important environmental gradients and spatial scales that drive community phylogenetic structure. We discuss the insights this gives us into the ecological assembly processes that differentiate plant communities found in northeast Utah.</p>
Data from: Fractal triads efficiently sample ecological diversity and processes across spatial scales
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Fractal sampling point nesting
<b>Description: </b><p>This dataset contains a table showing the nesting of sampling points within the fractal sampling design at the SAFE project and an R code file used to create the nesting from a GIS file of the core sampling locations.<br><br>There are five fractal levels across 17 sites: six experimental blocks (A-F), two edge transects (LFE, VJR) and three sets of triplets of sites to sample specific habitats (Old growth: OG1 - 3, Oil palm: OP1 - 3, Twice logged forest: LF1 - 3). Within each site, there are sampling points at five fractal scales with fractal order 1 as the smallest scale and fractal order 5 being the largest scale. This file identifies the child - parent relationships of points across the fractal sampling levels. For more details, see <a>https://www.safeproject.net/dokuwiki/safe_gis/safe_fractal</a>.</p><p><b>Project: </b>This dataset was collected as part of the following SAFE research project: <a href="https://www.safeproject.net/projects/project_view/1"><b>SAFE CORE DATA</b></a></p><p><b>XML metadata: </b>GEMINI compliant metadata for this dataset is available <a href="https://www.safeproject.net/datasets/xml_metadata?id=179">here</a></p><p><b>Files: </b>This dataset consists of 2 files: Fractal_point_nesting.xlsx, Nested_fractal_table_maker.R</p><p><b>Fractal_point_nesting.xlsx</b></p><p>This file contains dataset metadata and 1 data tables:</p><ol><li><p><b>Fractal sampling point nesting</b> (described in worksheet Fractal_point_nesting)</p><p>Description: This table contains one row for each fractal order 1 sampling point (finest scale) and then identifies the parent sampling points at the higher fractal scales (2-5). Note that not all sites have a central fractal order 5 point.</p><p>Number of fields: 9</p><p>Number of data rows: 579</p><p>Fields: </p><ul><li><b>Site</b>: Site ID prefix (Field type: ID)</li><li><b>Habitat</b>: Focal habitat of sampling site (Field type: Categorical)</li><li><b>Logging</b>: Logging history of sampling site (Field type: Categorical)</li><li><b>Frag_Area</b>: Estimated area of fragment (Field type: Numeric)</li><li><b>FirstOrder</b>: First order fractal point (Field type: Location)</li><li><b>SecondOrder</b>: Second order fractal parent (Field type: Location)</li><li><b>ThirdOrder</b>: Third order fractal parent (Field type: Location)</li><li><b>FourthOrder</b>: Fourth order fractal parent (Field type: Location)</li><li><b>FifthOrder</b>: Fifth order fractal parent (not applicable for all sites) (Field type: Location)</li></ul></li></ol><p><b>Nested_fractal_table_maker.R</b></p><p>Description: This R code creates the table stored in Fractal_point_nesting from the SAFE Core sampling stations GIS layer. </p><p><b>Date range: </b>2010-01-01 to 2020-01-01</p><p><b>Latitudinal extent: </b>4.6350 to 4.7716</p><p><b>Longitudinal extent: </b>116.9474 to 117.7031</p>
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