Calculate Daily Energy Requirement
calc_adultdee.RdThis function calculates the energy expenditure timestep t for adult birds, based on the activities carried out. This value is assumed to be the energy requirement for the following time step, t+1.
DEE is the sum of proportion of total deployment time spent on each of these activities multiplied by activity-specific energetic costs available from the literature (Pennycuick 1987, 1989; Croll & McLaren 1993; Hilton et al.2000a; Enstipp et al. 2006; respective costs: 1168.91 kJ day-1; 7361.72kJ day-1; 810.28 kJ day-1; 1894.90 kJ day-1) and the cost of warming food (Gremillet et al. 2003).
Usage
calc_adultdee(
alive,
colony_h,
flying_h,
foraging_h,
at_sea_h,
energy_nest,
energy_flight,
energy_forage,
energy_searest,
energy_warming,
assim_eff,
daylength
)Arguments
- alive
Is the bird dead or alive? 0,1
- colony_h
Time spent at the colony, hours
- flying_h
Time spent flying, hours
- foraging_h
Time spent foraging, hours
- at_sea_h
Time spent resting at sea, hours
- energy_nest
Energy cost of nesting at colony, kJ per day
- energy_flight
Energy cost of flight, kJ per day
- energy_forage
Energy cost of foraging, kJ per day
- energy_searest
Energy cost of resting at sea, kJ per day
- energy_warming
Energy cost of warming food, kJ per day
- assim_eff
Assimilation efficiency
- daylength,
Length of this species' time step, hours