Species Groups - BirdTrends 2023
This page summarises the data as used in the latest version of the Bird Trends Explorer.
Summary of time series
The current Bird Trends Explorer contains 63,713 graph data points across 4,263 individual time series spanning 329 species (including populations). The number of species covered by each metric is shown in the table below.
You can also download the BirdTrends 2023 Summary Stats as a PDF and see the Key Findings for BirdTrends 2023 on this complementary page.
| Metric type | Metric | Source scheme | No. species |
| Population abundance | Long-term trend (1994–) | BBS | 113 |
| Population abundance | Long-term trend (1998–) along linear waterways | WBBS | 76 |
| Population abundance | Long-term trend (1970s–) along linear waterways | WBS-WBBS | 25 |
| Population abundance | Long-term trend (1960s–) | CBC-BBS | 72 |
| Population abundance | Long-term trend (RBBP) | RBBP abundance | 2 |
| Population abundance | Long-term trend at heronries | Heronries Census | 1 |
| Population abundance | Long-term trend at colonies | SMP colony counts | 18 |
| Population abundance | Adult abundance (CES) | CES abundance | 23 |
| Distribution | Range size | Birdatlas range size | 329 |
| Breeding performance | Long-term trend at colonies | SMP productivity | 19 |
| Breeding performance | Clutch size | NRS clutch size | 90 |
| Breeding performance | Brood size | NRS brood size | 79 |
| Breeding performance | Egg-stage nest failure rate | NRS egg-stage nest failure rate | 90 |
| Breeding performance | Chick-stage nest failure rate | NRS chick-stage nest failure rate | 79 |
| Breeding performance | Fledglings per breeding attempt | NRS productivity | 79 |
| Breeding performance | Whole-season productivity (CES) | CES productivity | 23 |
| Survival and mortality | Adult survival (recoveries) | Ringing survival | 18 |
| Survival and mortality | Adult survival (RAS) | RAS survival | 24 |
| Timing of life cycle events | Timing of breeding | NRS laying date | 90 |
| Timing of life cycle events | Onset of primary moult | Ringing moult timing | 1 |
| Metric type | Metric | UK | England | Scotland | Wales | NI |
| Population abundance | Long-term trend (1994–) | 111 | 108 | 65 | 58 | 35 |
| Population abundance | Long-term trend (1998–) along linear waterways | 76 | 70 | 15 | 0 | 0 |
| Population abundance | Long-term trend (1970s–) along linear waterways | 25 | 0 | 0 | 0 | 0 |
| Population abundance | Long-term trend (1960s–) | 51 | 70 | 0 | 0 | 0 |
| Population abundance | Long-term trend (RBBP) | 2 | 1 | 2 | 2 | 2 |
| Population abundance | Long-term trend at heronries | 1 | 1 | 1 | 1 | 0 |
| Population abundance | Long-term trend at colonies | 18 | 0 | 0 | 0 | 0 |
| Breeding performance | Long-term trend at colonies | 18 | 7 | 18 | 4 | 0 |
| Distribution | Range size | 329 | 318 | 297 | 288 | 237 |
| Breeding performance | Clutch size | 90 | 0 | 0 | 0 | 0 |
| Breeding performance | Brood size | 79 | 0 | 0 | 0 | 0 |
| Breeding performance | Egg-stage nest failure rate | 90 | 0 | 0 | 0 | 0 |
| Breeding performance | Chick-stage nest failure rate | 79 | 0 | 0 | 0 | 0 |
| Breeding performance | Fledglings per breeding attempt | 79 | 0 | 0 | 0 | 0 |
| Timing of life cycle events | Timing of breeding | 90 | 0 | 0 | 0 | 0 |
| Timing of life cycle events | Onset of primary moult | 1 | 0 | 0 | 0 | 0 |
- You can also download the BirdTrends 2023 Summary Stats as a PDF and see the Key Findings for BirdTrends 2023 on this complementary page.
- Back to the top
Share this page