Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Leon Kelder
Mars Muusse

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2019 DATA & 2019 RINGED BIRDS

Cachinnans breeding in the Netherlands - recoveries of ringed birds.

WHAT IS THE ORIGIN OF THE BREEDING ADULTS?

Caspian Gull only recently started breeding in the Netherlands (first confirmed successful attempt was in 2012 when a male Caspian Gull x female Herring Gull had one chick at colony Wijk bij Duurstede). More breeding pairs were recorded since; colonisation started at high pace.

We have no certainty about the origins of these breeding birds, unless they were ringed already. Fortunately, several breeding birds were, and below you'll find maps and data.

By the way, the initial bird, the male Caspian Gull, was ringed as well, but the code was never read and attempts to trap the bird at the nest failed two times. However, the type of ring, a clip-ring, strongly suggests a Polish origin. Up to 2020, we (only) have recorded immigrants from both Polish and east German colonies, i.e. a strong indication for the continuation of a on-going process of Caspian Gull breeding range: westward expansion.

YELLOW PESV - Lelystad colony

Below is the recovery map for Caspian Gull PESV. In season 2020 this is a 10CY bird breeding at Lelystad, an immigrant from Babice colony, Poland where it was ringed as pullus in 2011. Several records at waste recycling plant in Oss, and 27 records in the Lelystad area, both in the Netherlands. Interestingly, after fledging, this bird was never observed in Poland again.

YELLOW PLDP - Lelystad colony

Next is the ecovery map for Caspian Gull PLDP, in season 2020 a 9CY bird breeding at Lelystad, immigrant from Paczków colony, Poland. Like the previous bird PESV, after fledging, this bird too was never observed in Poland again.

YELLOW PNED - Lelystad colony

The recovery map for Caspian Gull PNED, in season 2020 a 8CY bird breeding at Lelystad, immigrant from Paczków colony, Poland. (Observation in May 2020 in Czechia doubtful.) Map is inadequate in not showing observations at katwijk beach and at Lelystad breeding colony.

RED 02P4 - De Kreupel colony

Breeding bird at De Kreupel, originally ringe in Poland.
Data and map will follow.

GREEN XLDT - Lelystad colony

Recovery map for Caspian Gull XLDT, in season 2020 a 8CY bird breeding at Lelystad, immigrant from Gemany.
Data and map will follow.

YELLOW - X804 - De Kreupel colony

Yellow ringed bird from east Germany, now successfully breeding at De Kreupel.
Data and map will follow.

WHAT IS THE DISPERSAL OF DUTCH JUVENILES

Already, several birds that were ringed at Lelystad and De Kreupel, were recorded outside the colonies. Some birds remained in the near vicinity of the colony (e.g. a bird recorded multiple times within 30 km's from Lelystad), but some birds proved to be more adventurous, flying to the U.K. and to Portugal.

To follow: a map showing arrows to recovery sites, of birds hatched in the Netherlands.

RETURNING RINGED BIRDS AT LELYSTAD

As the ring project on juveniles started as recently as season 2019, we do not have full adults by 2020. However, a few birds returned already in their second year (or were just lingering around).

Code: n[F|G].

Code: n[F|L].

Code: n[F|N].

Caspian Gull Larus cachinnans F|A 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 25" in season 2020.
Caspian Gull Larus cachinnans F|B 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 25" in season 2020.
Caspian Gull Larus cachinnans F|C 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 17" in season 2020.
Caspian Gull Larus cachinnans F|D 1CY, May 2020, the Netherlands & July 2020, Suffolk. Picture: Merijn Loeve & Brian Small.
Bird hatched at
"nest 32" in season 2020.
Caspian Gull Larus cachinnans F|E 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 31" in season 2020.
Caspian Gull Larus cachinnans F|F 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 37" in season 2020.
Caspian Gull Larus cachinnans F|G 1CY, May & July 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 38" in season 2020.
Caspian Gull Larus cachinnans F|H 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 38" in season 2020.
Caspian Gull Larus cachinnans F|0 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 09" in season 2020.
Caspian Gull Larus cachinnans F|1 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 06 yPESV" in season 2020, one of the parents being Caspian Gull Larus cachinnans PESV 10CY originally from Poland.
Caspian Gull Larus cachinnans F|2 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 21" in season 2020.
Caspian Gull Larus cachinnans F|4 1CY, May & September 2020, the Netherlands & England. Picture: Merijn Loeve & Andy Hale.
Bird hatched at
"nest 21" in season 2020.
Caspian Gull Larus cachinnans F|5 1CY, May & September 2020, the Netherlands & Portugal. Picture: Merijn Loeve, Rui Viana & Helder Cardoso.
Bird hatched at
"nest 33" in season 2020.
Caspian Gull Larus cachinnans F|6 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 33" in season 2020.
Caspian Gull Larus cachinnans F|7 1CY, May, August & October 2020, Lelystad & Dordtse Biesbosch, the Netherlands. Picture: Merijn Loeve, Eric Roeland & Jos Koopman.
Bird hatched at
"nest 06" in season 2020, one of the parents is Caspian Gull Larus cachinnans PESV 10CY originally from Poland.
Caspian Gull Larus cachinnans F|8 1CY-2CY, May 2020 & February 2021, Lelystad & Almere, the Netherlands. Picture: Merijn Loeve & Eric Roeland.
Bird hatched at
"nest 11" in season 2020.
Caspian Gull Larus cachinnans F|9 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 11" in season 2020.
Caspian Gull Larus cachinnans F|= 1CY-2CY, May 2020 - February 2021, Lelystad & Almere, the Netherlands. Picture: Merijn Loeve & Eric Roeland.
Bird hatched at
"nest 14" in season 2020.
Caspian Gull Larus cachinnans F|+ 1CY-2CY, May 2020 - February 2021, Lelystad & Almere, the Netherlands. Picture: Merijn Loeve & Eric Roeland.
Bird hatched at
"nest 14" in season 2020.
Caspian Gull Larus cachinnans F|R 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 03" in season 2020.
Caspian Gull Larus cachinnans F|S 1CY, May - October 2020, Lelystad & Almere, the Netherlands. Picture: Merijn Loeve, Eric Roeland & Mars Muusse.
Bird hatched at
"nest 03" in season 2020.
Caspian Gull Larus cachinnans F|T 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 03" in season 2020.
Caspian Gull Larus cachinnans F|U 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 29" in season 2020.
Caspian Gull Larus cachinnans F|V 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 35" in season 2020.
Caspian Gull Larus cachinnans F|W 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 35" in season 2020.
Caspian Gull Larus cachinnans F|X 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 02" in season 2020.
Caspian Gull Larus cachinnans F|Y 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 01" in season 2020.
Caspian Gull Larus cachinnans F|Z 1CY, May 21 2020, Lelystad, The Netherlands (52°30'36.17"N 005°25'11.70"E). Picture: Merijn Loeve.
Bird hatched at
"nest 09" in season 2020.

Caspian Gull Larus cachinnans F1 1CY, May 21 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K05" in season 2020.

Caspian Gull Larus cachinnans F2 1CY, May 21 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K03" in season 2020.
Caspian Gull Larus cachinnans F3 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K03" in season 2020.
Caspian Gull Larus cachinnans F4 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K03" in season 2020.
Caspian Gull Larus cachinnans F5 1CY, May 21 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K02" in season 2020.
Caspian Gull Larus cachinnans F7 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K04" in season 2020.
Caspian Gull Larus cachinnans F8 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K04" in season 2020.
Caspian Gull Larus cachinnans F9 1CY, May 21 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K07" in season 2020.
Caspian Gull Larus cachinnans F+ 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K06" in season 2020.
Caspian Gull Larus cachinnans F= 1CY, May 21 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K05" in season 2020.
Caspian Gull Larus cachinnans FA 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K08" in season 2020.
Caspian Gull Larus cachinnans FB 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K08" in season 2020.
Caspian Gull Larus cachinnans FD 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K09" in season 2020.
Caspian Gull Larus cachinnans FE 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K09" in season 2020.
Caspian Gull Larus cachinnans FF 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird (maybe?) hatched at
"nest K09" in season 2020.

Caspian Gull Larus cachinnans FH 1CY, June 12 2020, De Kreupel, the Netherlands (52°47'59.5"N 5°13'33.2"E).
Bird hatched at
"nest K09" in season 2020.