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handle: 10261/79845
[EN] Common Crane (Grus grus) spring migration was studied during 1984 and 1985 at Gallocanta lake (NE-Spain). The migratory period extended from mid February to late March. It was estimated that one bird spent, on average, 8 and 5 days, respec-tively for 1984 and 1985, in the study area. The first days of March were the period of most intensive crane migration. Peak Staging population figures were reached on 8th March 1984 (6107 cranes) and 9th March 1985 (20 878 cranes). The total numbers of migrating cranes censused were 16 351 and 31 945, respectively during the 1984 and 1985 seasons. Preliminary correlations between numbers of birds departing and some meteorological variables are given. Also, the effect of air temperature on the timing and pattern of departure is discussed.
[HU] A szerzők a daru (Grus grus) tavaszi vonulását tanulmányozták az északkelet-spanyolországi Gallocanta-tónál 1984. és 1985. év során. A vonulás február közepétől március végéig tartott. Becslések szerint egy-egy madár átlagosan 8 napot töltött a pihenőhelyen 1984-ben és ötöt 1985-ben. A daru tavaszi vonulásának legmozgalmasabb szakasza március első napjaiban volt, 1984-ben a pihenő darvak számának csúcsa március 8-ra (6107 egyed), 1985-ben március 9-re (20 878 egyed) esett. A vonuló darvak összesen észlelt száma 1984-ben 16 351,1985-ben 31 945 volt. Az eltávozó madarak száma és néhány meteorológiai változó közötti összefüggéseket közölnek előzetesen. Ezen kívül kitérnek arra, hosy milyen hatással van a léghőmérséklet az eltávozás idejére és módjára.
Most of the field expenses and the travel of one of us (J.C.A.) to the Ist Meeting of the European Crane Group were financed by CAICYT—C.S.I.C. Project No. 22 107—Ol. Accommodation expenses of the field team were financed by the Dirección General de Medio Ambiente (MOPU).
10 paginas, 4 figuras y 3 tables
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