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Most individuals, few sites: spatial concentration of threatened butterfly populations challenges occurrence-based conservation
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DOI：10.1016/j.biocon.2026.111953.png)
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Abstract
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• Lorenz–Gini analysis quantifies spatial population concentration. • Top 20% of grids held 44–53% of peak counts across three species. • Ecological specialisation intensified spatial aggregation. • Habitat predictors of peak density were species-specific. • Density-based metrics complement occurrence-based conservation.
Keywords:
Conservation prioritisation
Density heterogeneity
EU Habitats Directive
Gini coefficient
Lorenz curve
Spatial aggregation
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