Patterns in long-term changes of farmland bird populations in areas differing by agricultural management within an Eastern European country

Hanzelka, Jan; Telenský, Tomáš; Reif, Jiří

doi:10.1080/00063657.2015.1048423

Cited by 10 publications

(5 citation statements)

References 47 publications

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“…As farmland birds, we considered 29 species (Table S1) based on their habitat requirements described in national literature on avian ecology (Hudec & Šťastný, ; Šťastný & Hudec, ). Our species set partly overlaps with an earlier study focused on Czech farmland birds (Reif & Hanzelka, ), as well as with the species used for the calculation of the national Farmland Bird Index (Hanzelka, Telenský, & Reif, ; Vermouzek, ). We thus repeated all analyses with these partly different sets of species (Table S1) to judge the robustness of our results to species selection.…”

Section: Methodsmentioning

confidence: 99%

Collapse of farmland bird populations in an Eastern European country following its EU accession

Reif

Vermouzek

2018

CONSERVATION LETTERS

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Eastern European countries are considered a stronghold for the continent's farmland biodiversity. The abundance of farmland birds is one important element of this biodiversity. At the end of the 20th century, member states of the European Union (EU) experienced serious population declines of farmland birds due to agricultural intensification, which was not observed in the Eastern European nonmember states. In 2004, 10 mostly Eastern European countries acceded to the EU. It is thus important to ask whether this historical step resulted in changes of agricultural production and, in turn, in farmland bird populations. Here we used annual crop yields and monitoring data on farmland bird abundance in an Eastern European new EU‐member state and showed that agricultural production intensified and farmland bird populations declined steeply after country's EU accession. These results indicate that entering EU's Common Agricultural Policy caused significant deterioration of farmland biodiversity in a once biodiversity‐rich region.

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Section: Methodsmentioning

confidence: 99%

Collapse of farmland bird populations in an Eastern European country following its EU accession

Reif

Vermouzek

2018

CONSERVATION LETTERS

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“…Songbird population changes show much variation within their distribution area, but main trends based on long-term studies can be determined (Reif 2013, Hanzelka et al 2015, Buchanan et al 2016, Brlík et al 2021, Reif et al 2022, Wesołowski et al 2022, Virkkala et al 2023. Based on our current results, the annual number of adult Garden Warblers and Barred Warblers showed a decreasing trend during the study period.…”

Section: Discussionmentioning

confidence: 59%

Population trend and breeding productivity of some migrant passerines in Hungary

Kiss,

Karcza,

Lukács

et al. 2023

Ornis Hungarica

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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.

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“…Similarly, the stronger declines observed in Central and East regions compared with the Norway trend may relate to the relative distribution of habitats of different quality across regions of Norway, or variation in the extent or strength of detrimental environmental changes, underpinned, for example, by regional differences in land‐use policies (Hanzelka et al . 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Conversely, the weaker declines in rural sites suggest either a buffered response of farmland birds to widespread detrimental changes or that some changes are occurring disproportionately less in these areas. Similarly, the stronger declines observed in Central and East regions compared with the Norway trend may relate to the relative distribution of habitats of different quality across regions of Norway, or variation in the extent or strength of detrimental environmental changes, underpinned, for example, by regional differences in land-use policies (Hanzelka et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Non‐random sampling along rural–urban gradients may reduce reliability of multi‐species farmland bird indicators and their trends

Husby

Hoset

Butler

2020

Ibis

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The continued global biodiversity crisis necessitates the continuation and development of new well‐designed monitoring strategies and action plans with particular focus on under‐represented countries and regions. However, limited resources in terms of budget and availability of qualified field personnel can restrict the geographical coverage of monitoring efforts. Focusing monitoring efforts on a representative subset of species and locations can improve cost‐efficiency. Optimal performance of multi‐species indicators derived from such an approach requires objective methods for species selection and a sampling design that reduces inherent sampling bias caused by regional differences in habitat availability or accessibility. To explore the performance of a multi‐species indicator across different regions within a nation, we developed a multi‐species indicator (MSI) for farmland birds in Norway using objective niche‐based selection of species. We compare the performance of this indicator at national and regional scales (Central and East regions) in Norway, and between urban and rural sites within regions. The seven‐species indicator obtained from the species selection provided similar indicator values and trends for Norway and the Central and East regions, as well as for rural sites within the combined Central + East region. All trends were defined as showing moderate decline from 2007–2016. Urban sites within the combined Central + East region provided trend estimates that showed stronger decline than rural areas in the same region during the time span. Our results emphasize the need to control for sampling bias when structuring monitoring programmes such as a Breeding Bird Survey (BBS). This is especially important if limited resources restrict the geographical coverage of the monitoring scheme. We recommend that monitoring schemes follow a stratified random sampling design that represents both the availability of different land cover types and their distribution with regard to proximity to highly populated areas. If that is not possible, statistically weighting data from different regions or landscapes is likely to be necessary.

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Patterns in long-term changes of farmland bird populations in areas differing by agricultural management within an Eastern European country

Cited by 10 publications

References 47 publications

Collapse of farmland bird populations in an Eastern European country following its EU accession

Collapse of farmland bird populations in an Eastern European country following its EU accession

Population trend and breeding productivity of some migrant passerines in Hungary

Non‐random sampling along rural–urban gradients may reduce reliability of multi‐species farmland bird indicators and their trends

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