Aves, p�le ornithologique de Natagora

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Aves, 40/1-4 | 2003 | 70-71

  Spatial pattern of Black Stork (Ciconia nigra) territories in Kemeri National Park, Latvia.
Strazds, M., Liepa, A. & Kuze, J.

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Article summary

Stuidies on Black Storks are carried out since 1990 in the territory of the Kemeri National Park. In this territory a high density of breeding Black Storks is recorded - 5 nests are known within a 5 Km2 area, 4 of them successful in 1997 ( the 5 th was discovered in 2000). The shortest distances between these 4 nests are 1,400 m, 1,180 m and 3,500 m. However this traditional approach does not show the accurate situation of each nest. If measuring the shortest distances to the four closest neighbouring nests in N, E, S and W sectors, the average distances for these 4 nests were 4,945 m, 3,970 m, 4,060 m and 4,495 m (avg. 4,367 m) and the most successful nest (successful breeding for 11 subsequent years i.e. as long as the nest has been known) appeared to be the most isolated one. The feeding flights were found to cross neighbours’ territories and birds from several nests were observed to forage at the same spot (sometimes simultaneously). The territorial soaring of single birds (and possibly also display flights of pairs) seem to be most intense on the edge of “territories”. As the feeding and flight observations are based on either accidental sightings collected during 11 years or on visual observations (simultaneously from different localities) only, and as no adult birds are individually identifiable by rings, these data shall be considered as preliminar. For detailed analysis of habitat use and territorial integrity of each nest, radio telemetry studies as necessar.

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