Description Usage Arguments Value Author(s) References See Also Examples
Uses a P matrix and a starting continuous stage value to estimate time to a range of target sizes, from which a size to age pattern can be determined.
1 | sizeToAge(Pmatrix, startingSize, targetSize)
|
Pmatrix |
object of class IPMmatrix describing growth survival transitions. |
startingSize |
numeric, size at age 1, or size from which age-size relationship is desired. |
targetSize |
vector of size(s) for which first passage time is required. |
timeInYears |
Time taken to reach target sizes in unit of the time step of the model. |
targetSize |
Vector of target sizes. |
startingSize |
Size at age 1. |
C. Jessica E. Metcalf, Sean M. McMahon, Roberto Salguero-Gomez, Eelke Jongejans & Cory Merow.
Caswell, 2001. Matrix population models: analysis, construction and interpretation. 2nd ed. Sinauer. p110-132.
Metcalf, Horvitz, Tuljapurkar & Clark. 2009 A time to grow and a time to die: a new way to analyze the dynamics of size, light, age and death of tropical trees. Ecology 90, p2766-2778.
Cochran & Ellner. 1992. Simple methods for calculating age-based life history parameters for stage-structured populations. Ecological Monographs 62, p345-364.
See for bias in this estimation where variance in growth is small relative to the size range: Zuidema, Jongejans, Chien, During & Schieving. 2010. Integral Projection Models for trees: a new parameterization method and a validation of model output. Journal of Ecology 98, p345-355.
1 2 3 4 5 6 7 | dff <- generateData()
Pmatrix <- makeIPMPmatrix(minSize = min(dff$size, na.rm = TRUE),
maxSize = max(dff$size, na.rm = TRUE), growObj = makeGrowthObj(dff),
survObj = makeSurvObj(dff))
targetSize <- 8
startingSize <- 0
sizeToAge(Pmatrix, startingSize, targetSize)
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