Publications

Publications

BTO create and publish a variety of important articles, papers, journals and other publications, independently and with our partners, for organisations, government and the private sector. Some of our publications (books, guides and atlases) are also available to buy in our online shop.

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Effects of tracking devices on individual birds – a review of the evidence

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Published: 2019

Newly-published work by BTO has reviewed the long-term patterns in the use of tracking devices on individual birds, and how the effects of the use of such devices are reported. More than 3,400 peer-reviewed publications were included in this review. The numbers of papers based on tracking studies increased by 4.4% per year between 1962, when this technology was first deployed, and the end of 2017. The types of ecological questions addressed with tracking devices varied between groups of species. For example, seabirds have mostly been tracked for studies on foraging and energetics, while landbirds have primarily been tracked to investigate habitat use and dispersal. Migration was the most common study topic across all species.

09.01.19

Papers

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Declining population trends of European mountain birds

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Published: 2019

Mountain areas often hold special species communities, and they are high on the list of conservation concern. Global warming and changes in human land use, such as grazing pressure and afforestation, have been suggested to be major threats for biodiversity in the mountain areas, affecting species abundance and causing distribution shifts towards mountaintops. Population shifts towards poles and mountaintops have been documented in several areas, indicating that climate change is one of the key drivers of species’ distribution changes. Despite the high conservation concern, relatively little is known about the population trends of species in mountain areas due to low accessibility and difficult working conditions. Thanks to the recent improvement of bird monitoring schemes around Europe, we can here report a first account of population trends of 44 bird species from four major European mountain regions: Fennoscandia, UK upland, south‐western (Iberia) and south‐central mountains (Alps), covering 12 countries. Overall, the mountain bird species declined significantly (-7%) during 2002–2014, which is similar to the declining rate in common birds in Europe during the same period. Mountain specialists showed a significant -10% decline in population numbers. The slope for mountain generalists was also negative, but not significantly so. The slopes of specialists and generalists did not differ from each other. Fennoscandian and Iberian populations were on average declining, while in United Kingdom and Alps, trends were nonsignificant. Temperature change or migratory behaviour was not significantly associated with regional population trends of species. Alpine habitats are highly vulnerable to climate change, and this is certainly one of the main drivers of mountain bird population trends. However, observed declines can also be partly linked with local land use practices. More efforts should be undertaken to identify the causes of decline and to increase conservation efforts for these populations.

04.01.19

Papers

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BirdTrends 2018

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Published: 2019

The BirdTrends 2018 report is a one-stop shop for authoritative information about the population status of the common breeding birds of the wider UK countryside. The report is based on data gathered by the many thousands of volunteers who contribute to BTO-led surveys.

01.01.19

Reports BirdTrends

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Review of data and monitoring options for assessing the status of breeding wader populations in the Yorkshire Dales National Park

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Published: 2018

Breeding waders are among the birds of highest conservation concern in the UK. The findings of recent national scale surveys suggest that the Yorkshire Dales National Park (YDNP) supports important breeding concentrations of several wader species. This report assesses the availability and quality of information relating to breeding populations of six of the most numerous wader species (Oystercatcher, Golden Plover, Lapwing, Snipe, Curlew, Redshank) in the YDNP. We make recommendations about how the ability of these datasets to inform the Park Authority (YDNPA) about wader population trends and distributions can be maintained or enhanced, and how this information can be deployed to inform planning for and management of waders in the YDNP.

31.12.18

Reports

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