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Bridging Species Niche Modeling and Multispecies Ecological Modeling and Analysis Jeffery Cavner, J.H. Beach, Aimee Stewart, CJ Grady jcavner@ku.edu, beach@ku.edu,astewart@ku.edu, cjgrady@ku.edu Biodiversity Institute University of Kansas
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Species Diversity LmRAD (Lifemapper Range and Diversity) Biodiversity - describe, visualize and analyze different aspects of the numbers and abundances of taxa in time and space. Patterns of species richness - constituent species ranges sizes and spatial locations of those ranges. Patterns related to species associations, co-occurrence, and species interactions requires testing against randomized distributions. Species richness and species range can be summarized and linked by one basic analytical tool, the presence/absence matrix (PAM).
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Lifemapper as an overarching architecture LmRAD is built on top of the existing Lifemapper architecture Lifemapper is an archival and species distribution modeling platform consisting of a computational pipeline, specimen data archive, predicted species distribution model archive Distribution models are built on-demand using openModeller. Inputs: climate scenario data and aggregated specimen occurrences from GBIF and user provided occurrence points.
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The Presence Absence Matrix (PAM) Data MatrixGrid
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Most existing indices of biodiversity are simple combinations of : o Vectors: species richness sizes of distributions “dispersion fields” “diversity fields” o Whitaker’s beta diversity o The dimensions of the PAM
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Constraints Construction of PAMs can be an extremely time consuming data management task Current methods for working with these matrices can be computationally slow
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Approach To overcome computational restraints we use a Python implementation of the Web Processing Service standard on a compute cluster, exposing spatial and statistical algorithms. Allows a variety of species inputs Extendable clients including Quantum GIS (QGIS) and VisTrails that share a common client library
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Clients
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Randomizing the PAM To test the null hypothesis By producing the same richness and range patterns while ignoring realistic species combinations Two Types of Randomization: Swap and Dye Dispersion –Swap : keeps species richness and range size totals intact.
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Additional Randomization methods Dye Dispersion –Geometric constraints model –Assumes range continuity –Reassembles ranges –Keeps range size intact
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QGIS is used as a WPS client
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Using QGIS and WPS to construct a grid
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The asynchronous nature of WPS combined with a computational pipeline and compute cluster allow a user to intersect hundreds of species layers at a time with the data grid to populate the PAM.
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Terrestrial Mammals Proportional Species Richness Per-site Range Size HighYellow ModerateRed LowBlue
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Statistical services provide diversity indices and plots using WPS
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By-species range-diversity plot
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The plug-ins use a simple MVC pattern with QT threads for asynchronous WPS requests and a client library for the communication layer
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Conclusion
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Jeffery Cavner, J.H. Beach, Aimee Stewart, CJ Grady jcavner@ku.edu, beach@ku.edu, astewart@ku.edu, cjgrady@ku.edu Biodiversity Institute University of Kansas
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