Scientific Journal of the BirdLife Hungary

A Magyar Madártani és Természetvédelmi Egyesület tudományos folyóirata

Ornis Hungarica. vol.19. (2011) p.30-39.

Annual changes of the wing-length, body weight and fat level of migrating reed warbler (Acrocephalus spp.) populations between 1988 and 2004
Gyurácz József, Bank László, Bedenek Gábor

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Abstract:

Wing-length, body weight and fat level of migrating birds of Sedge Warbler (Acro-
cephalus schoenobaeuns), Reed Warbler (A. scirpaceus) and Great Reed Warbler (A. arundinaceus) were studied at the fish-pond of Sumony, S Hungary (45° 58'N, 17° 56'E) in the autumns of 1988–2004. The average values of the wing-length, body weight and fat level were calculated for each species and year. The average values of the wing-length, body weight and fat level of each species significantly varied between the years. There were not
trends in the average values of the wing-length of each species from 1988 to 2004. There were not trends in the average values of the body weight and fat level of Great Reed Warbler from 1988 to 2004. There were negative trends in the average values of the body weight and fat level of Sedge Warbler from 1988 to 2004. There was also negative trend in the average values of the fat level of Reed Warbler from 1988 to 2004. There was not significant
correlation between the average values of the wing-length, body weight and fat level of each species and average temperature and precipitation of the breeding and migration periods.