Journal of Ornithology

, Volume 157, Issue 2, pp 419–425 | Cite as

Extracting historical population trends using archival ringing data—an example: the globally threatened Aquatic Warbler

Original Article

Abstract

Understanding how animal population size changes over time is one of the key means to identify threats and facilitate the successful implementation of conservation measures. The globally endangered Aquatic Warbler has undergone a major decline throughout its range. While in the first half of the 20th century, it was still an abundant species across major parts of Central and Western Europe, over the last century the size of its European population is considered to have declined by more than 90 %. However, little is known of the historical changes in its population size. Here we model the past population size of the Aquatic Warbler using historical ringing records of European ringing schemes and population monitoring software (TRends for Indices and Monitoring). We found that during the short 30-year period between 1950 and 1980 the European Aquatic Warbler population underwent a dramatic 95 % decline. According to this model, the population has recently been stable, no further decline was observed between 1980 and the late 1990s.

Keywords

Acrocephalus paludicola Bird ringing Population change TRends for indices and monitoring 

Zusammenfassung

Rekonstruktion früherer Populations-Trends anhand archivierter Beringungsdaten am Beispiel des weltweit bedrohten Seggenrohrsängers (Acrocephalus paludicola) Zu wissen, wie sich die Größen von Populationen über die Zeit verändern, ist im Naturschutz entscheidend wichtig für das Verstehen zukünftiger Bedrohungen und für Entscheidungen, mit welchen Maßnahmen man erfolgreich gegen sie vorgehen kann. Die Bestände des weltweit bedrohten Seggenrohrsängers gehen auf breiter Front zurück. In der ersten Hälfte des 20. Jahrhunderts gab es noch Populationen in weiten Bereichen Zentral- und Westeuropas, aber im letzten Jahrhundert sind die Populationen um mehr als 90 % zurückgegangen, wobei über die früheren, historischen Veränderungen der Populationsgrößen jedoch nur sehr wenig bekannt ist. In unserer Untersuchung modellierten wir frühere Populationsgrößen des Seggenrohrsängers mit Hilfe alter Beringungsdaten europäischer Beringungsprojekte und einer für Populationsuntersuchungen erstellten Software (TRends for Indices and Moniotoring—TRIM). Wir haben festgestellt, dass die europäische Population des Seggenrohrsängers nur allein in den 30 Jahren von 1950 bis 1980 um dramatische 95 % zurückgegangen ist. Das Modell zeigt ferner, dass sich die Population in letzter Zeit stabilisiert hat; zwischen 1980 und den späten 1990er Jahren konnte kein weiterer Rückgang mehr beobachtet werden.

Supplementary material

10336_2015_1306_MOESM1_ESM.doc (343 kb)
Supplementary material 1 (DOC 343 kb)

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Copyright information

© Dt. Ornithologen-Gesellschaft e.V. 2015

Authors and Affiliations

  1. 1.Institute of BiologyUniversity of LatviaSalaspilsLatvia
  2. 2.Department of Zoology and AnthropologyPalacký University of OlomoucOlomoucCzech Republic

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