Scientific Journal of the BirdLife Hungary

A Magyar Madártani és Természetvédelmi Egyesület tudományos folyóirata

Ornis Hungarica. vol.8 Suppl. 1.. (1998) p.163-168.

Influence of the macrosynoptical weather situations on the autumn migration dynamics of the Sedge Warblers (Acrocephalus schoenobaenus)
Gyurácz József, Károssy Csaba, Csörgő Tibor, Bank László és Palkó Sándor

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In the camps for bird-ringing of the Hungarian Ornithological and Nature Conservation Society in Ócsa, Fenékpuszta and Sumony in the course of 1988, 1989 and 1990 the dynamics of the migration of about 7500 Sedge Warblers (Acrocephalus schoenobaenus) has been examined in the mirror of the macro-synoptical weather situations, according to Piczely. To analyse the effects of macrosynoptic weather situations on the migration dynamics of the Sedge Warbler, a total of 7500 birds captured at three locations in central, southern and south western Hungary were evaluated. During autumn migration, birds preferred northern winds (tail-wind) that decreased their energy consumption, and/or clear skies when they can use of the stars and the moon for orientation. Such typical weather situations occur: I.During an anticyclon, with its centre over the Carpathian Basin dominates all over the Central European area. The wind is light and of variable direction,, starting out of the centre. There are few clouds, the precipitation is low and the temperature is high. Usually it stays in the Carpatian Basin for several days. 2. The continuation of an Azoric anticyclon that streches back to the Middle-European area. The westerly-north-westerly wind in the Carpathian Basin is brisk. During the summer it is cooler than the season's temperature. The visibility is good. 3. Anticyclon, situated over the Balticum and Poland. During the summer it is warmer than the temperature characteristic of that season. The fresh air and north wind are characteristic.