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Comparing population trend estimates of migratory birds from breeding censuses and capture data at a spring migration bottleneck

Maggini, Ivan and Cardinale, Massimiliano and Favaretto, Andrea and Vorisek, Petr and Spina, Fernando and Maoret, Francesco and Ferri, Andrea and Riello, Sara and Fusani, Leonida (2021). Comparing population trend estimates of migratory birds from breeding censuses and capture data at a spring migration bottleneck. Ecology and Evolution. 11 , 967-977
[Research article]

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Abstract

Europe has a well-established network of breeding bird monitoring that is used to produce supranational indices of population trends for many species. However, a comparison of breeding bird censuses with other methods may be beneficial to confirm the validity of such indices. The aim of this study was to assess the value of standardized capture data of migratory birds at migration bottlenecks as an indicator of the effective breeding populations. One limitation to this method is that several populations are co-occurring at these bottlenecks and their catchment areas need to be clearly identified to allow extrapolation of population indices. Here, we used standardized trends in capture numbers of 30 species on the island of Ponza, a migration bottleneck in the central Mediterranean, and compared them to population trends estimated in the putative catchment breeding areas between 2005 and 2016. The catchment areas were identified through the analysis of ring recoveries during the breeding season of birds passing through Ponza. Our results show an agreement between the population trends observed on Ponza and those in the breeding areas in 15 out of 30 species. The correlations were strongest in species with a more robust definition of the catchment areas, that is, species with more than 10 recoveries, and for which the recoveries were most likely of breeding birds. The main reason for disagreement between the two indices in the remaining species might be related to different intensity of sampling in different areas. This issue can be solved by further developing monitoring projects in underrepresented countries, as well as by intensifying monitoring through ringing, both in the breeding grounds and at migration bottlenecks. These results show that spring migration monitoring at bottlenecks has the potential to provide a valuable complement and an independent control of breeding bird surveys, allowing raising early warnings of population declines and contributing to their conservation.

Authors/Creators:Maggini, Ivan and Cardinale, Massimiliano and Favaretto, Andrea and Vorisek, Petr and Spina, Fernando and Maoret, Francesco and Ferri, Andrea and Riello, Sara and Fusani, Leonida
Title:Comparing population trend estimates of migratory birds from breeding censuses and capture data at a spring migration bottleneck
Series Name/Journal:Ecology and Evolution
Year of publishing :2021
Volume:11
Page range:967-977
Number of Pages:11
ISSN:2045-7758
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:bird ringing, migratory bottleneck, PECBMS, Ponza, population indices
URN:NBN:urn:nbn:se:slu:epsilon-p-109352
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109352
Additional ID:
Type of IDID
DOI10.1002/ece3.7110
Web of Science (WoS)000600001200001
ID Code:22142
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:08 Feb 2021 11:44
Metadata Last Modified:08 Feb 2021 11:51

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