Lesser Black-backed Gull (graellsii & intermedius)

(last update: May 17 2015)

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Lesser Black-backed Gull graellsii J3 2CY, January -June & October 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.

Please visit José's FLICKR PHOTO STREAM and also José Blog "Seabirds Portugal".

OBSERVATION REPORT

RINGS
Color ring - G[J3]
Metallic ring - 5508167
EURING code - 05910 - www.cr-birding.org/node/1063
Right leg (tarsus) Metallic ring
Right leg (tibia) Green ring with white two alpha-code
Left leg (tibia) - Black ring
Ringer - Roland-Jan Buijs
Age at first ring - Pullus - Date - 2015.07.14
Place where ringed - Europoort (Dintelhaven), Zuid-Holland

SPECIES
Type of bird - Larus fuscus (Lesser Black-backed Gull)
Age & Sexe - immature - unknown

OBSERVATION
Date of the sighting - 31.10.2016 - Time -
- my sightings/2016 - 6 - total of my sightings: 6
Place - Douro River Estuary, Porto, Portugal
Coordinates: - 41.1478339,-8.6542039
Observers: Peter Rock, Inocêncio Oliveira & José Marques

LIFE HISTORY
Date Location Observer
15-08-2015 IJmuiden (Strand Zuidpier), Noord-Holland, NL - Leon Edelaar
19-09-2015 Nederlands Continental Plat (Offshore), Voordelta, NL - André Strootman
19-09-2015 Nederlands Continental Plat (Offshore), Voordelta, NL- Dirk van Straalen
19-09-2015 Nederlands Continental Plat (Offshore), Voordelta, NL - George Tanis
19-09-2015 Nederlands Continental Plat (Offshore), Voordelta, NL - Roland-Jan Buijs
06-12-2015 Arteixo (Strand), A Coruña, SPANJE- Xabier Varela
24-01-2016 Matosinhos (Strand), Douro Litoral, PORTUGAL - José Marques
01.02.2016 Douro River Estuary, V.N.Gaia, Portugal – Armando Mota
02-02-2016 Matosinhos Beach, Matosinhos Portugal – José Marques
06-03-2016 Matosinhos Beach, Matosinhos Portugal – José Marques
11-03-2016 Leixões Harbour, Matosinhos Portugal – José Marques
10-06-2016 Porto (Oporto), Portugal – Luis Mota
17-06-2016 Leixões Harbour, Matosinhos Portugal – José Marques
31.10.2016 Douro River Estuary, Porto, Portugal- Peter Rock, Inocêncio Oliveira & José Marques

below: Lesser Black-backed Gull graellsii J3 2CY, October 31 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.

P10 fully grown. Jumpy partial autumn moult. GC replaced again?

below: Lesser Black-backed Gull graellsii J3 2CY, June 17 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.

'Full' GC row with 2nd gen feathers. P4/P7.

below: Lesser Black-backed Gull graellsii J3 2CY, March 11 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.

Illustrative bird for explaining the "late winter post-juvenile moult" in western Lesser Black-backed Gull (not nominate fuscus). There is no primary moult, but moult may include all other feather tracts in advanced birds. To indicate the onset of this moult, it is important to witness the very start of the process, which this bird does.

Few inner coverts just replaced and some inner MC missing. Note juvenile central GC which will be replaced by June (must have been dropped and replaced in April-May).

below: Lesser Black-backed Gull graellsii J3 2CY, March 06 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.

below: Lesser Black-backed Gull graellsii J3 2CY, February 02 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.

Covert moult not started yet.

below: Lesser Black-backed Gull graellsii J3 2CY, January 24 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.