To refer to this model in academic publications, please use:īrewer, S.D. Permission to use, modify or redistribute this model is hereby granted, provided that both of the following requirements are followed:ī) this model will not be redistributed for profit without permissionĬontact the authors for appropriate licenses for redistribution for profit. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.) Were based on functions from the "Life" and "Traffic Grid" models. This model was inspired by many of the sample Netlogo models and parts This model was created as part of the 2008 BioQUEST Curriculum Consortium Summer Workshop.Ĭopyright 2008 by Steven Brewer. This model uses the same logic as the "Life" and "Traffic Grid" models in the Netlogo library. Add a mechanism for patches to expand to non-adjacent patches. In fact, most invasive species have extremely small seeds which are easily blown across roads. This prevents the invasive species from spreading across roads, for example. The model is extremely sensitive to changes in these values.Ĭurrently, the only mechanism for plants to spread is by being adjacent. Try increasing and decreasing the threshold values. This section could give some ideas of things for the user to notice while running the model. Then add a network of roads and explore the effects of density. Roads represent disturbed areas which make it easier for an invasive species to gain a foothold.įirst explore increasing the initial density of the invasive plant. The thresholds for these values are set with sliders. If it has few or no invaded or disturbed neighboring patches, it will be reclaimed by the native flora. If a patch is adjacent to enough invaded and/or disturbed patches, it will be invaded also. This simulation, based on a cell automata model, shows the role that disturbed areas can play in the distribution of an invasive plant.Įach patch looks at surrounding patches. Some, like Garlic Mustard, can produce a monoculture that crowds out other species. Invasive species are non-native species that move into and disrupt native communities.
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