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Coordinators: Albert de Jong Leon Kelder Roland-Jan Buijs Thijs Horst Merijn Loeve Mars Muusse |
Cachinnans breeding in the Netherlands - project information
Initiation of this project In 2014, what seemed to be the first pure pair of Caspian Gull was observed at the manufactured sandy isle 'De Kreupel' in lake IJsselmeer. And again, in breeding seassons 2015-2017 there were single pairs breeding at different locations along rivers in the eastern part of the country, but as far as we know, all nests failed. Most of the breeding birds involved sub-adult males, which may have been one of the reasons for the low success rate. Meanwhile, a few pair of Caspian Gulls started nesting in a colony of large gulls on breakwaters near Lelystad, at lake IJsselmeer. In 2016, at least three pairs were discovered among ca. 200 pairs of Lesser-Black Backed Gulls and over 40 pairs of Herring Gulls (Boele et al. in series 2014-2020). Over the next couple of years, the colonies at De Kreupel & Lelystad increased and from 2019 on, we decided to monitor them more intensely. Leon Kelder started coordination at De Kreupel, Albert de Jong and Mars Muusse became coordinators for Lelystad; both colonies fall under Buijs Ringing Programme, and observers are kindly requested to send in observations to ring@buijsecoconsult.nl . For Lelystad, visits to the breakwaters in 2019, and detailed observations of the breeding birds from a kayak revealed at least 12 nests of pure Caspian Gull couples and one nest of Caspian Gull x Herring Gull. In the same lake system, four pairs were seen on isle 'De Kreupel' in 2019, but actually numbers may have been much higher. Obviously, Caspian Gulls have established a small but growing population in the Netherlands now. In breeding season 2020, lake IJsselmeer accounted for at least 42 nesting pairs, including some mixed pairs with Herring Gull, but in general most nest looked fine for pure Caspian x Caspian Gull parents. Interestingly, some of the breeding birds involved had been ringed as chicks in Poland (Babice and Paczków) and in the eastern part of Germany (Gräbendorfer See), showing natal dispersal of 600-850 km. In subsequent years, the IJsselmeer colony expanding at rapid space. To get a better understanding of the phenotypic characteristcs in the Dutch population, and to monitor the future choice of nest locations of Dutch hatched chicks, we started a ringing scheme in 2019. Already, these ringed birds showed up abroad, with foreign recoveries of juveniles in the UK (Norfolk) and the Atlantic coast of France, Spain and Portugal. The future will tell if they will become breeders in more Dutch colonies, or even, whether they make a next leap, and maybe will start breeding further west, like in the U.K.? LARUS CACHINNANS - GOALS OF THIS RESEARCH Comparative research of Caspian Gull (CG), Herring Gull (HG) and Lesser Black-backed Gull (LBBG) at IJsselmeer.
LARUS CACHINNANS RESEARCH - METHODS
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The largest in Belarus roof-top colony of large white-headed gulls: main results of 2018 investigations // Proceeding of 5 th International Scientific and Practical Conference & Zoological Readings - 2019. Grodno. 2019: 246-250. Schermerhorn, P. 2017. Pontische meeuw rukt op vanuit het oosten; in 2016 eerste broedgeval langs de IJssel. De IJsvogel (86): 7-8. Skórka P., Wójcik J.D. & Martyka R. 2005. Colonization and population growth of Yellow-legged Gull Larus cachinnans in southeastern Poland: causes and influence on native species. Ibis 147: 471-482. Staatsbosbeheer (geraadpleegd 2023) Over West-Friesland – Vogeleiland De Kreupel. Tomiałojć, L., & Stawarczyk,T. 2003. The Avifauna of Poland: distribution, numbers and trends. PTPP ‘pro Natura’, Wrocław. |
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![]() Klaas van Dijk IN: Sula 2015 |
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![]() Camphuysen & Gronert, 2010. |
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