La Tour du Valat

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How much time is required to survey land birds in forest-dominated atlas squares?

J. M. Roberge, Auteur ; S. Svensson, Auteur

Dans Ornis Fennica (80(3) 2003)

Using bird atlas data from south-central Sweden and information on survey effort for the corresponding 5 x 5 km grid squares, we assessed how much time is required to get reliable presence/absence data for forest birds. We restricted the analyse[...]

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