<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>This study aimed to monitor the demographic changes of some closely related species based on bird ringing data from the CES (Constant Effort Sites) program in Hungary between 2007 and 2018, and to explore the reasons for these demographic changes. The CES program tracks breeding bird populations with standard methods. The studied species breeding in Hungary were from genera <italic>Sylvia</italic>, <italic>Curruca,</italic> and <italic>Phylloscopus</italic>. Among these species, the trends of some forest birds, like Eurasian Blackcap <italic>(Sylvia atricapilla)</italic>, Lesser Whitethroat <italic>(Curruca curruca)</italic>, Common Chiffchaff <italic>(Phylloscopus collybita)</italic> and Willow Warbler (<italic>Ph. trochilus)</italic> showed no substantial changes, and one of the open-habitat species, the Barred Warbler <italic>(Curruca nisoria)</italic> – a long distant migrant – showed decreasing trends. The Garden Warbler <italic>(Sylvia borin)</italic> – a trans-Saharan migrant but forest dweller – also experienced population declines. Short-distance migrants maintained stable populations. Common Whitethroat productivity displayed an increasing trend to compensate for population decline. Upon examining the Eurasian Blackcap, this study detected a strong relationship between the number of adult birds, productivity, and the number of adults captured the following year.</p>
</abstract>

This study aimed to monitor the demographic changes of some closely related species based on bird ringing data from the CES (Constant Effort Sites) program in Hungary between 2007 and 2018, and to explore the reasons for these demographic changes. The CES program tracks breeding bird populations with standard methods. The studied species breeding in Hungary were from genera Sylvia, Curruca, and Phylloscopus. Among these species, the trends of some forest birds, like Eurasian Blackcap (Sylvia atricapilla), Lesser Whitethroat (Curruca curruca), Common Chiffchaff (Phylloscopus collybita) and Willow Warbler (Ph. trochilus) showed no substantial changes, and one of the open-habitat species, the Barred Warbler (Curruca nisoria) – a long distant migrant – showed decreasing trends. The Garden Warbler (Sylvia borin) – a trans-Saharan migrant but forest dweller – also experienced population declines. Short-distance migrants maintained stable populations. Common Whitethroat productivity displayed an increasing trend to compensate for population decline. Upon examining the Eurasian Blackcap, this study detected a strong relationship between the number of adult birds, productivity, and the number of adults captured the following year.

Population trend and breeding productivity of some migrant passerines in Hungary

University of Eötvös Loránd, Savaria Campus

Ornis Hungarica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Population trend and breeding productivity of some migrant passerines in Hungary"}

This study aimed to monitor the demographic changes of some closely related species based on bird ringing data from the CES (Constant Effort Sites) program in...

Population trend and breeding productivity of some migrant passerines in Hungary

Published Online: Dec 09, 2023

Page range: 74 - 88

Received: Oct 02, 2023

Accepted: Nov 05, 2023

DOI: https://doi.org/10.2478/orhu-2023-0020

Keywords
CES program, annual capture, demographic changes

© 2023 Csilla Kiss et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Population trend and breeding productivity of some migrant passerines in Hungary

Published Online: Dec 09, 2023

Page range: 74 - 88

Received: Oct 02, 2023

Accepted: Nov 05, 2023

DOI: https://doi.org/10.2478/orhu-2023-0020

KeywordsCES program, annual capture, demographic changes

© 2023 Csilla Kiss et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
CES program, annual capture, demographic changes