Decline in snail abundance due to soil a
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J. Graveland; R. Wal
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Article
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1996
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Springer-Verlag
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English
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On poor soils in the Netherlands an increasing number of great tits, Parus major, and of other forest passerines produce eggs with defective shells and have low reproductive success as a result of calcium deficiency. A similar increase in eggshell defects has been observed in Germany and Sweden. Sna