Löhrl effect

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The Löhrl effect (after Hans Löhrl ) describes in ornithology the relationship between the size of nesting holes and the clutch size as well as the reproductive success of certain bird species.

research

The ornithologist Hans Löhrl could prove that in trials in 1973 and 1980, great tits have larger clutches and higher breeding success in larger nests than in smaller nest boxes. He was also able to prove that great tits clearly prefer larger breeding spaces. Such influence the nesting box size on clutch size was later also for other bird species such as the marsh tit , the willow tit , the flycatcher , the woodpecker and the Star are detected, the effect in the marsh tit and willow tit was most evident.

literature

  • Hans Löhrl: Influence of the brood space area on the clutch size of the great tit (Parus major) . In: Journal of Ornithology . tape 114 , no. July 3 , 1973, doi : 10.1007 / BF01640340 .
  • Hans Löhrl: Further experiments on the question of “brood space and clutch size” in the great tit (Parus major) . In: Journal of Ornithology . tape 121 , no. October 4 , 1980, doi : 10.1007 / BF01643336 .
  • Fritz Trillmich, Hans Hudde: The brood chamber influences clutch size and reproductive success in the starling (Sturnus vulgaris) . In: Journal of Ornithology . tape 125 , no. January 1 , 1984, doi : 10.1007 / BF01652940 .