2.3. Distribution maps
Two distribution maps were created to; (1) show capture locations of lionfish for the 987 records in our database relative to depth, temperature, and salinity (Fig. 1A), and (2) show the distribution of adults (>10 cm, represented by squares) verses juvenile (<10 cm, represented by triangles) (Fig. 1B).
2.4. RSM simulation
Using derived record parameters, a cellular automata model was written in a combination of Visual Basic.Net (VB.Net) and Structured Query Language (SQL) using a SQL Server database and Visual Studio 2008. This RSM was used to run iterative simulations to determine which combination of parameters (depth, salinity, temperature, and current) produced an invasion sequence matching the location and first reported occurrences as recorded by the USGS database. The RSM is gridded at a resolution of 1° latitude × 1° longitude cell size (about 100 km × 100 km), with a total of 1382 cells. Simulations created with the RSM are based on a range of acceptable parameter values (salinity, temperature, and depth) and a weighted ‘score’ factor determining the likelihood of a cell becoming colonized by lionfish. Upper and lower ranges for temperature, salinity, and depth were set to the mean value ± 2 standard deviations, as determined by the aforementioned statistical analysis of the parameter data. Additionally, these three parameters were always weighted equally when running simulations. This is because the likelihood of a cells parameter value falling into the preferred range was based on each parameters respective 95th percentile range and was thus equal.Fig. 2 and Fig. 3, and Table 1 provides an overview of such a calculation. Following is the process logic.
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