Table 1.
Parameter values for modelling spring stopover of pink-footed geese in Nord-Trøndelag
| Parameters | Units | Values | References |
|---|---|---|---|
| Body mass M (g) | g | 2612 | Baveco et al. (2011) |
| Grassland | Brands (2012) | ||
| Functional response b 1 | g m−1 | 0.28 | (1) |
| Functional response b 2 | g m−1 | 9.6 | |
| Functional response c | s m−1 | 2.8 | |
| Minimal cropping time T c0 | s | 0.42 | |
| Maximal chewing rate R max | g s−1 | 0.0085 | |
| Alert factor | 1.00 | ||
| Cereal fields | B.A. Nolet (unpubl. data) | ||
| Attack rate a | m2 s−1 | 0.00325 | |
| Handling time h | s g−1 | 69 | |
| Metabolism | |||
| Basal metabolic rate BMR | J s−1 | 8.69 | Baveco et al. (2011) (2) |
| Resting metabolic rate RMR (=1.4 BMR) | J s−1 | 12.2 | Baveco et al. (2011) |
| Field metabolic rate FMR (=1.9 BMR) | J s−1 | 16.5 | Baveco et al. (2011) |
| Flight metabolic rate VMR (=14.2 BMR) | J s−1 | 123.4 | Madsen and Klaassen (2006) (3) |
| Energy intake for weight increase E G | J day−1 | 1 235 621 | (4) |
| Flight speed v | m s−1 | 13.9 | Chudzińska et al. (2016b) |
| Max. distance from roost V max | m | 10 000 | C.E. Simonsen (unpubl. data) |
| Max. goose density | ind ha−1 | 350 | C.E. Simonsen (unpubl. data) |
| Twilight used for foraging | h | 1 | B.A. Nolet (unpubl. data) |
| Foraging periods | Day−1 | 2 | Chudzińska et al. (2016b) |
| Resource data | |||
| Initial values (April 1) | |||
| Grass LAI | m2 leaves m−2 soil | 0.6 | |
| Grass biomass leaves, stems | g DW m−2 | 42.9 | |
| Barley grains (stubble fields) | g DW m−2 | 21.6 | (5) |
| Field management | |||
| Fraction spring ploughing | – | 0.5 | Chudzińska et al. (2015) |
| Ploughing delay | Day | 22 (SD 7) | Supplementary Material 1.5 |
| Sowing delay | Day | 10 (SD 4) | Supplementary Material 1.5 |
| Sowing density (barley) | m−2 (g DW m−2) | 450 (23.9) | (6) |
| Available fraction sown | – | 0.13 | (7) |
(1) Based on biomass per plant, bite size on Phleum taken to be 2.8× greater than on Lolium (http://www.bioforsk.no/ikbViewer/Content/35578/Liv.pdf)
(2) Mistakingly given as 7.35
(3) 8.9 J m−1 × 13.9 m s−1
(4) c = e g· Δm· LBM/k g, where energy tissue content e g = 27 500 J g−1 (Madsen and Klaassen 2006), fraction body mass increase Δm = 0.0157 (Lindström 1991), lean body mass LBM = 2382 g (Madsen and Klaassen 2006) and efficiency of utilization of metabolizable energy k g = 0.83 (Lopez and Leeson 2005)
(5) 408 grains m−2 × 0.053 g DW grain−1 (own measurements)
(6) Recommended sowing density barley 450 grains m−2. Dry weight grain 53 mg (own measurements)
(7) To arrive at the 60 grains m−2 density measured at soil surface (Chudzińska, personal communication)