BTO publishes various reports, from those covering the annual results of core surveys, through scientific studies, and on to those produced in partnership with other organisations. Many of these are published as BTO Research Reports. You can access all of our reports from here, though note that we are currently updating the reports section, working backwards through time to bring all of the report pages into a consistent format. You can read our Annual Report and Accounts in the Governance section.
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Production of smoothed population trends when a key year of data is missing.
This report explores the impact on the direction and statistical confidence in the individual species trends from which the wild bird indicator is composed when including missing years in the dataset, using simulated subsets of real data from previous years. This report was prompted by the impacts of Covid-19 lockdown restrictions on survey effort.
12.04.23
Reports
Analysis of waterbird population trends for Northern Ireland’s sea loughs: assessing the potential impacts of aquaculture and disturbance. Part 3 – Larne Lough, Killough Harbour and Dundrum Inner Bay
This study is part three of a series of sector‐level analysis reports on sea‐lough WeBS data in Northern Ireland, previously documenting Carlingford Lough, Strangford Lough, Belfast Lough, and Lough Foyle, which were chosen as sites that host aquaculture activities. These reports aim to improve understanding of the fluctuations in numbers of waterbirds within the sites and inform the consenting of operations and assessment of development plans on these protected areas. This report aims to provide an initial insight into the potential impact of intertidal Oyster aquaculture on trends in Larne Lough, Killough Harbour and Dundrum Inner Bay.
17.03.23
Reports
Analysis of waterbird population trends for Northern Ireland’s sea loughs: assessing the potential impacts of aquaculture and disturbance: Part 2 – Belfast Lough and Lough Foyle
This study aims to produce the first sector-level analysis of Wetland Bird Survey (WeBS) data in Northern Ireland, on two of the sea-lough sites that host aquaculture activities. This will improve understanding of the fluctuations in numbers of waterbirds within the sites and inform the consenting of operations and assessment of development plans on these SPAs.
17.03.23
Reports
Analysis of waterbird population trends for Northern Ireland’s sea loughs: assessing the potential impacts of aquaculture and disturbance. Part 1 – Strangford Lough and Carlingford Lough
This study aims to produce the first sector-level analysis of Wetland Bird Survey (WeBS) data in Northern Ireland, on two of the sea-lough sites that host aquaculture activities. This will improve understanding of the fluctuations in numbers of waterbirds within the sites and inform the consenting of operations and assessment of development plans on these SPAs.
17.03.23
Reports
Northern Ireland Seabird Report 2022
The 10th NI Seabird Report charts the fortunes of Northern Ireland's breeding seabird species and sheds light on the initial impact of avian influenza.
15.03.23
Reports
Highly pathogenic avian influenza in wild birds in the United Kingdom in 2022: impacts, planning for future outbreaks, and conservation and research priorities.
The Joint Nature Conservation Committee (JNCC) and BTO organised a virtual workshop to develop thinking to support ongoing efforts to manage the highly pathogenic avian influenza (HPAI) outbreak, and to consider longer-term evidence requirements to enable positive conservation actions and species recovery. The HPAI workshop report includes discussions about the impacts of the disease, planning for future outbreaks, and conservation and research priorities.
02.03.23
Reports
BirdTrends 2022
The BirdTrends 2022 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.
15.02.23
Reports
Bailiwick Bat Survey 2022 Report
This report presents the main findings from survey work delivered using passive acoustic monitoring devices deployed across the Bailiwick of Guernsey. Through the surveys that we support we aim to improve knowledge and understanding of species distribution and activity, covering a range of taxonomic groups, including bats, small terrestrial mammals and insects. Through this approach we provide robust datasets that can be used to inform better decision-making processes.
23.01.23
Reports
A review to inform the assessment of the risk of collision and displacement in petrels and shearwaters from offshore wind developments in Scotland
08.12.22
Reports