Reports

Reports

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, which includes BBS reports, Waterbirds in the UK (WeBS) reports and SMP 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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Breeding periods of hedgerow-nesting birds in England

Author:

Published: Spring 2024

Hedgerows form an important semi-natural habitat for birds and other wildlife in English farmland landscapes, in addition to providing other benefits to farming. Hedgerows are currently maintained through annual or multi-annual cutting cycles, the timing of which could have consequences for hedgerow-breeding birds. The aim of this report is to assess the impacts on nesting birds should the duration of the management period be changed, by quantifying the length of the current breeding season for 15 species of songbird likely to nest in farmland hedges. These species are Blackbird, Blackcap, Bullfinch, Chaffinch, Dunnock, Garden Warbler, Goldfinch, Greenfinch, Linnet, Long-tailed Tit, Robin, Song Thrush, Whitethroat, Wren and Yellowhammer.

05.03.24

BTO Research Reports

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Ryevitalise - Bats and Ancient Trees, 2023 Report

Author:

Published: 2023

Working with a network of volunteers, static acoustic bat detectors were deployed over a long survey season, to provide the fourth season of extensive bat data for the Ryevitalise Landscape Partnership Scheme area of the North York Moors National Park. This report provides an overview of the survey coverage and main results from 2023.

05.12.23

BTO Research Reports

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Analysis of Wetland Bird Survey (WeBS) data for The Humber Estuary SSSI, SAC, SPA and Ramsar site: fourth appraisal — sector-level trends to winter 2021/22

Author:

Published: 2023

This study updates previous reports that assessed population trends of waterbird species in different parts of the Humber Estuary, in order to identify areas where species were declining contrary to, or in excess of, the trend for the Humber Estuary as a whole and, furthermore, to identify sectors that support an increasing proportion of species that are declining across the Humber Estuary as a whole. Note: An error included when the report was originally published in 2023 was spotted and corrected in July 2025, the PDF then replaced with the correction. The error is that the figure for Table 3.1.i on p26 was duplicated and accidentally repeated as Table 3.1.ii on p27.

01.12.23

BTO Research Reports

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