SNPsm {dave} | R Documentation |

A dynamic model of succession on alp Stabelchod in the Swiss Nationl Park using differential equations and numerial integration. 6 species guilds are considered. Space is conceived as a grid of 30 times 40 cells. Typical simulation time is around 500yr.

```
SNPsm(trange,tsl,diff,r6,...)
SNPsm2(trange=100,tsl=5.0,diff=0.001,r6=NULL)
## Default S3 method:
SNPsm(trange, tsl, diff, r6, ...)
## S3 method for class 'SNPsm'
plot(x, ...,out.seq=1,col=FALSE)
```

`trange` |
Time range of simulation in yr |

`tsl` |
Time range of simulation in yr |

`out.seq` |
Time interval (yr) at which maps of the state are printed |

`diff` |
A diffusion coefficient driving random spatial propagation |

`r6` |
Growth rates of 6 guilds involved, increase in cover percentage per yr |

`...` |
Parameter out.seq, the plotting interval |

`x` |
An object of class "SNPsm" |

`col` |
A logical variable to suppress color printing |

An object of class "SNPsm" with at least the following items:

`n.time.steps ` |
Number of time steps used for numerical integration |

`imax ` |
Vertical grid count |

`jmax ` |
Horizontal grid count |

`time.step.length ` |
The time step length in yr |

`veg.types ` |
The names of the vegetation types, i.e., the species |

`vegdef ` |
A nspecies x nspecies matrix defining composition of vegetation types |

`growth.rates ` |
The growth rates given upon input |

`sim.data` |
Simulated scores of all species (guilds) during simulation time |

`tmap` |
The 30 x 40 grid map of types used as initial condition |

`igmap` |
The same as tmap |

`frame` |
A 30 x 40 grid showing initial forest edges, used for printing |

Otto Wildi

Wildi, O. 2002. Modeling succession from pasture to forest in time and space. Community Ecology 3: 181–189.

Wildi, O. 2017. Data Analysis in Vegetation Ecology. 3rd ed. CABI, Oxfordshire, Boston.

```
r6=NULL # imposes default growth rates
o.stSNP<- SNPsm(trange=100,tsl=10.0,diff=0.001,r6)
plot(o.stSNP,out.seq=50)
```

[Package *dave* version 2.0 Index]