Die Nahrung höhlenbrütender Singvögel in einem Eichenwickler-Schadgebiet

A Comparative Sudy of the Breeding Ecology of the Great TitParus majorin Different Habitats

“…While many of the preys observed in the present study could not be identified as to species, the high percentage in the diet from these two species is beyond doubt. Similarly, other workers (Betts 1955b, Pfeifer & Keil 1959, Henze & Gornandt 1959 have reported Operophthera brumata and/or Tortrix l'iridana as the main prey species for early broods of Great Tits in oakwood. These species often reach plague densities in continental Europe, but there is no information on the densities (in pure oakwood) of the larger prey species mentioned by Royama.…”

“…Several authors have studied the food of Great Tit nestlings in habitats similar to those of the present study (Kluyver 1950, Betts 1955b, Pfeifer & Keil 1959, Henze & Gornandt 1959, Bouchner 1960, Tinbergen 1960, Gibb & Betts 1963, Bosenberg 1964, Kabisch 1965a, 1965b, Royama 1970). In most of these studies the com p 0 sit ion of the nestlings' diet was investigated, and the results were expressed as percentages by number.…”