The following table summarises the number of juvenile Acrocephalus warblers ringed on the Teifi Marshes up to the end of July for each of the last eight years.
RW = Reed Warbler
SW = Sedge Warbler
effort = ringing sessions, i.e. a combination of the number of days and different sites at which ringing took place.
RW/e and SW/e indicate the number of new juvenile birds ringed per session, rounded to the nearest whole bird!
| RW | SW | effort | RW/e | SW/e | |
| 2014 | 131 | 98 | 26 | 5 | 4 |
| 2015 | 89 | 53 | 17 | 5 | 3 |
| 2016 | 82 | 67 | 22 | 4 | 3 |
| 2017 | 84 | 120 | 21 | 4 | 6 |
| 2018 | 99 | 132 | 28 | 4 | 5 |
| 2019 | 30 | 46 | 18 | 2 | 3 |
| 2020 | 57 | 64 | 20 | 3 | 3 |
| 2021 | 48 | 58 | 14 | 3 | 4 |
The numbers will be a function of both the number of breeding pairs present and of their breeding success.
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