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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[An atlas of bird ringing at the island of Helgoland. Part 1: Temporal and regional changes of recovery rates and causes of death of birds ringed at Helgoland (1909 to 1998).]
Auteurs :	Kathrin Hueppop, Auteur ; Ommo Hueppop, Auteur
Type de document :	Article
Dans :	Vogelwarte (41(3) September, 2002)
Article en page(s) :	161-180
Langues:	Allemand
Résumé :	Recoveries from 90 years of bird ringing at Helgoland offer an unique material for analyses of the causes of death of birds in Europe throughout the 20th century. Despite uncertainties in the interpretation, great regional and/or temporal differences in recovery rates and causes of death become obvious for the large variety of species ringed at Helgoland. Increased information and interest of the public are the reasons for the increase in the portion of ring reports with detailed information about the condition of recovery. The high density of ringers and birdwatchers on the British Isles and at Helgoland explains the exceptionally high portions of birds reported as "alive and healthy" from there, especially in the last 20 years. For Helgoland it explains the increase of recovery rates as well. The overall decline of the recovery rates of birds ringed at Helgoland (excluding those found at the island itself) in the course of the 20th century, generally can be led back to decreased hunting rates in most of the recovery regions as well as to an increased ringing intensity of small birds. At a closer sight regional differences appear. The significant decrease of birds killed actively by men in almost all regions and species groups can mainly be explained by the restriction of hunting. However, only in Central Europe this portion of dead-recoveries has dropped to less than 5%, in contrast to SW-Europe where this portion remained unchanged. During the 20th century the percentage of ringed birds killed "passively" by men has increased in all recovery regions and species groups, except for birds at Helgoland itself: a percentage of finally 14% of all found-dead recoveries in the last 20 years (up to 49% in raptors and owls), above all due to collisions with buildings and vehicles, indicate an increased "technical pollution". Especially for songbirds such conspicuous and long-term changes in this category are not known so far. Also the "chemical pollution" (mainly oil) must not be neglected, particularly in seabirds. The changes in the causes of death hardly coincide with changes in population sizes. Calculations in Blackbird and Song Thrush implicate effects of hunting intensity and/or augmented technical constructions on survival rates, but not in the Sparrowhawk.

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