Sedge Warbler – records

Acrocephalus schoenobaenus – TELOR YR HESG – Breeding summer visitor and passage migrant. Not recorded from November to February

Earlier records are summarised in Sedge Warbler 1994

YearFirst sightingLast sightingNotes
199314 April25 SeptemberBreeding densities: 2 pairs Skokholm, 27-29 pairs Skomer, 14 pairs Dowrog
199412 April5 October3 pairs at Skokholm. 33 territories at Skomer, 12 pairs Dowrog
199511 April10 October5 pairs at Skokholm, 24 territories at Skomer (where an albino was noted and photographed), 15 territories Dowrog, CES at Teifi Marshes revealed record productivity with 217 of 278 trapped being juveniles. Strong autumn passage noted at Llangloffan where almost 500 ringed in mid-August. Controls included 2 ringed in south-west Scotland.
199620 April30 September4 pairs at Skokholm, 26 pairs Skomer where up to 4 albino or partial albino birds noted. 12 pairs at Dowrog
19979 April27 September12 territories at Dowrog, 24 Skomer, 3 Skokholm
199817 April2 October11 territories at Dowrog, 79 trapped at Teifi Marshes CES, (3 from previous years). Newly ringing 34 juvs and 42 adults.
199917 April14 October29 pairs bred at Skomer, 4 Skokholm, 12 Castlemartin Corse, 16 Dowrog, 69 at Teifi Marshes. All-white bird with black eyes, 25 July – August.
200020 April29 September35 pairs bred Skomer, 4 pairs Skokholm; 10 singing males St. David’s airfield 30 Apr, 13 pairs Dowrog.
200110 April1 OctoberReported breeding: Pembroke MP; Skokholm; Castle Martin range, min. of 27 territories; Skomer, 34 territories, fledglings noted 7 July
200221 April3 OctoberBreeding: Skokholm – 6 territories identified, 5 pairs definitely bred. Skomer – 39 pairs bred; fledglings noted 27 June. An albino seen on Skomer 1 Aug.
200315 April27 SeptemberBreeding: Skokholm, 4 pairs with first fledglings seen 8 July; Skomer, 25 pairs bred and fledglings noted from 17 June.
200423 April25 September
20056 April8 AugustBreeding: 30 territories at Skomer, 10 Dowrog, 20 Ivor’s Pond/Treleddyd Fawr, 5 singing Goodwick Moor 24 April
200620 April4 AugustSkomer recorded 44 territories, its highest breeding total on record, only single figures bred before 1981.
200714 April27 SeptemberBetween 53 and 59 territories were mapped on Skomer, 20% increase on the 44 territories in 2006. 4 pairs on Skokholm, 2 on Ramsey.
200812 April31 August18 singing birds Teifi Marshes on 8th June
20096 April19 SeptemberCES ringing at Teifi Marshes caught a total of 271, with 144 on 4 May, and 116 on 10 May. The largest count on Skomer was 34 on 28 May.
201014 April18 September15 territories held on Skomer, 6 on Ramsey
20119 April5 October26 territories held on Skomer
201211 April8 SeptemberMax count 30+ near Jordanston 24 July
201318 April31 August17 breeding territories at Gupton Farm, 32 on Skomer
201411 April21 SeptemberSingle on Grassholm, 31 May.
44 territories on Skomer
201517 April25 September40 territories on Skomer
201611 April18 AugustMax count, 102 at Teifi Marshes 3 May. Recorded from at least 33 1km squares, with breeding evidence from at least 19 of these.
20172 April19 SeptemberRecorded from at least 54 1km squares. Breeding evidence reported from at least 35 locations, including 53 pairs mapped on Skomer and 11 pairs on Skokholm.
20187 April24 SeptemberReported from at least 41 1km square locations. Breeding evidence from 15 of these. Highest counts from Skokholm were 43 on 9th Aug and 41 on 4th Aug.
20191 April2 NovemberReported from at least 55 locations. Breeding evidence was reported from 28 locations.
Largest counts in spring were: 25 on Skokholm 1 May, 100 Teifi Marshes 7 May, and 14 on Skomer 31 May. In autumn: 15 Skomer 15 July, 26 on Skokholm 16 July with 22 there on 1 Aug and 20 on Grassholm 4 Aug.
20207 April18 September12 territories in 1km squares SM7225 & 7325 (Trefaiddan). 42 territories counted on Skomer and one on Ramsey, the first in 25 years.
Largest spring counts in were: 10 Marloes Mere 10 May, 13 Teifi Marshes 1 May.
In autumn only large count was of 18 on Skomer 30 Aug.
Monthly max counts on Skokholm: 9 April, 12 May, 14 June, 16 July & August, 1 Sept (14th)

Records extracted from the Pembrokeshire Bird Reports, which may contain more detail than shown here.

More about the Sedge Warbler in Pembrokeshire