Experimentally increased insectivorous bird density results in a reduction of caterpillar density and leaf damage to Pyrenean oak

By J. Sanz. Ecological research, 2001

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Impact of avian and arthropod predation on lepidopteran caterpillar densities and plant productivity in an ephemeral agroecosystem (2003, background): “…recent decades, several studies have shown that insectivorous birds can reduce insect prey densities significantly (e.g. Holmes et al., 1979; Bock et al., 1992; Greenberg et al., 2000) and plant defoliation caused by leaf-chewing insects (Marquis & Whelan, 1994; Greenberg et al., 2000; Sanz, 2001).”
Providing nest boxes for hole-nesting birds – Does habitat matter? (2005, background): “Such an aggregation, often accompanied by relative food shortage (e.g., Sanz 2001) and/or intraspecific interference (reviewed in Newton 1998), is the probable reason for low reproductive success in the preferred habitat.”
Biodiversity and pest management in orchard systems. A review (2011, background): “Sanz (2001) showed that such management of artificial nesting sites favours the installation of Tit populations.”