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- Title
Die Bedeutung der Habitatstrukturen als Regulationsmechanismus für die Brutpaardichte von Rabenkrähen (Corvus c. corone).
- Authors
Menzel, Claudia; Strauß, Egbert; Meyer, Wilfried; Pohlmeyer, Klaus
- Abstract
Summary: In four regions of Lower Saxony with a total area of 113 km2 we examined woods and electricity pylons as habitat structures with respect to their frequency distribution and suitability as breeding places of carrion crows. We determined real population densities and calculated a hypothetical breeding density in relation to habitat structures in order to test a possible regulative effect of these structures on regional differences in settlement density ofCorvus c. corone. The regional capacities indicated a hypothetical breeding density 3.2 to 7.6 times higher than was proven in reality. Even in a medium-sized territory of 0.5 km2 (a value to be found in literature) a 1.4 times higher density is still possible. Furthermore, the regional nest distribution established by the index of dispersion was random, but the habitat structures showed clumping. Neither the habitat structures on their own nor in combination with territory size can be regarded as definite mechanisms of regulation in the choice of territory and breeding place and thence of the distribution and settlement density ofCorvus c. corone. The possible influence of food supply and non-breeding populations on distribution patterns and settlement densities is discussed.
- Subjects
LOWER Saxony (Germany); UTILITY poles; DISTRIBUTION (Probability theory); LAND settlement patterns; FOOD supply; REGIONAL differences; BIRD populations
- Publication
Bulletin of Experimental Biology & Medicine, 2019, Vol 166, Issue 6, p127
- ISSN
0007-4888
- Publication type
Article
- DOI
10.1007/BF01651904