model.joensson.customize {barrks} | R Documentation |
This page describes the parameters that can be used to customize the Jönsson model. The model was developed by Jönsson et al. (2011). Look here to find out how to apply the model.
dd_onset_start_date |
The date, when the degree days start to sum up ('MM-DD'). |
dd_onset_base |
Base temperature to calculate degree days to trigger the onset. |
dd_onset_threshold |
Degree days that are required to trigger the onset of
infestation. Additionally, the maximum temperature must exceed |
tfly |
Minimum temperature that beetles need to fly. |
dd_development_base |
Base temperature to calculate degree days for development. |
dd_total_dev_lower , dd_total_dev_upper |
Lower/upper limit of degree days that are required for a generation to fully develop |
dev_start , dev_end |
Share in total development when the egg development starts and the juvenile beetle's development ends respectively. Usable if the development below/above these thresholds should account for mating, oviposition etc. |
dev_mortal_min , dev_mortal_max |
The beetles are considered to be in
white stages (egg, larva, pupa) if their development exceeds |
model_end_date |
Date when the model ends (no further development will be modeled). |
daylength_dia , tdia_min |
When the daylength falls below |
In barrks
, model()
is used to customize a model. The following code
illustrates which parameters are available for the Jönsson model and specifies their
default values.
model("joensson", # ==== onset ==== dd_onset_start_date = '01-01', dd_onset_base = 5, dd_onset_threshold = 120, # ==== onset + development ==== tfly = 20, # ==== development ==== dd_development_base = 5, dd_total_dev_lower = 625, dd_total_dev_upper = 750, dev_start = 0, dev_end = 1, dev_mortal_min = NULL, dev_mortal_max = NULL, model_end_date = '12-31', # ==== diapause ==== daylength_dia = 19.3, tdia_min = 15 )
Jönsson AM, Harding S, Krokene P, Lange H, Åke Lindelöw A, Økland B, Ravn HP, Schroeder LM (2011).
“Modelling the potential impact of global warming on Ips typographus voltinism and reproductive diapause.”
Climatic Change, 109, 695-718.
doi:10.1007/s10584-011-0038-4.
Schroeder M, Dalin P (2017).
“Differences in photoperiod-induced diapause plasticity among different populations of the bark beetle Ips typographus and its predator Thanasimus formicarius.”
Agricultural and Forest Entomology, 19(2), 146-153.
doi:10.1111/afe.12189.
model()
, phenology()
, model.joensson.apply
Other model customizations:
model.bso.customize
,
model.chapy.customize
,
model.lange.customize
,
model.phenips.customize
,
model.phenips_clim.customize
,
model.rity.customize