A productivity-based explanation for woodland bird declines: poorer soils yield less food

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The causes of decline of birds of eucalypt woodlands: advances in our knowledge over the last 10 years (2011, background): “These are mostly small to medium-sized insectivores and nectarivores, especially those that forage on the ground (Watson 2011).”
Climate‐induced resource bottlenecks exacerbate species vulnerability: a review (2015, background): “most productive parts of the landscape (Watson 2011).”
Nutritional composition of the preferred prey of insectivorous birds: popularity reflects quality (2015, unknown): “As insectivory and ground-foraging behavior are major factors linking these species, nutrient limitation due to changing availability of preferred prey has been proposed as a possible contributor to their decline (Watson 2011).”
Insect Declines in the Anthropocene. (2020, background): “In Australia, some insect-feeding lineages of birds have declined faster than sympatric grani-vores (150, 197).”