Table 2 Values of the population parameters used to build the base model in VORTEX.
From: Population viability analysis of the endangered Dupont’s Lark Chersophilus duponti in Spain
Parameter | This analysis | Source | Population | Sensitivity and alternative models | 10% SD added to values |
|---|---|---|---|---|---|
Inbreeding depression—lethal equivalents | 6.29 | Lacy and Pollak 2017 | |||
Inbreeding depression—lethal alleles | 50% | Lacy and Pollak 2017 | |||
EV correlation among populations | 50% | Suárez and Carriles 2010 | Metapopulation | ||
Youngest age of dispersal | 1 year | García-Antón et al. 2015 | Iberian Range | ||
Oldest age of dispersal | 1 year | Assumed | |||
Survival of dispersers | 50% | Assumed | 0–100% | ||
Dispersal rate among populations | 10% dispersers and updated connectivity analysis | Laiolo et al. 2008, García-Antón et al. 2020 | Ebro Valley, metapopulation | ||
Reproductive system | Monogamous | Authors’ own data | |||
Age of first offspring | 1 year | Suggested (Suárez et al. 2009a) | Metapopulation | ||
Maximum lifespan | 5 years | Authors’ own data | Iberian Range | ||
Maximum age of reproduction | 5 years | Authors’ own data | Iberian Range | ||
Maximum number of broods per year | 3 | Pérez-Granados et al. 2017 | Ademuz | ||
Maximum number of progeny per brood | 5 | Pérez-Granados et al. 2017 | Ademuz | ||
Sex ratio at birth | 50% | Suggested (Suárez et al. 2009b) | Metapopulation | ||
Adult females breeding | 100% | Assumed | 75–100% | X | |
Distribution of broods per year | 6–29-65% females lay 1–2-3 broods, respectively | Estimated from Skylark (Suárez and Carriles 2010) | |||
Productivity (offspring/brood) | 1.5 | Pérez-Granados et al. 2017 | Ademuz | 1.2–1.9 | X |
Mortality of females age < 1 year | 69% | Highest value available | Metapopulation | 60–75% | X |
Mortality of males age < 1 year | 69% | Highest value available | Metapopulation | 60–75% | X |
Mortality of females age > 1 year | 69% | Estimated from males (Suárez and Carriles 2010) | Metapopulation | 40–80% | X |
Mortality of males age > 1 year | 52% | Mean of the 2 data points available (Laiolo et al. 2008, Vögeli et al. 2008) | Ebro Valley | 0–70% | X |
Catastrophes | 1 (5% years, red. 5% breeding and survival | Suárez and Carriles 2010 | Iberian Range | ||
Males in breeding pool | 80% | Radiotracking (Suárez and Carriles 2010) | Iberian Range | ||
Initial population size | Most updated census available inferred to 2020 by population trend | Gómez-Catasús et al. 2018a | Metapopulation | See translocation program in text | |
Carrying capacity | Density observed by radiotracking (1 ind./10 ha) * habitat surface and quality, with K truncation | Garza et al. 2005, Gómez-Catasús et al. 2018a, García-Antón et al. 2019 | Iberian Range | See habitat restoration program in text | X |
