Recent trends of the Black-headed Gull Larus ridibundus population in Latvia

Viksne, Janis; Janaus, M.; Stīpniece, Antra

doi:10.34080/os.v6.22993

Cited by 13 publications

(4 citation statements)

References 1 publication

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“…I motsats hartill finns det lampliga hackningslokaler langs stOrre delen av den gotlandska kusten. (A yen om skrattmasar i Lettland, vid de fOdomassigt speciella fOrhallanden som ratt dar, konstaterats proviantera upp till 70 km fran hackningslokalen (Viksne & Janaus 1986, Viksne m.fl. 1996 ar provianteringsturerna normalt mycket kortare, under 15 km och oftast ocksa under 10 km (Brandl & Gorke 1988),) I atskilliga av de i denna uppsats citerade arbetena har forsamrad hackningsbiotop, framfor allt i form av igenvaxning, frarnforts som en fOrklaring (eller bidragande forklaring) till skrattmasens minskning.…”

Section: Vad Har Orsakat Den Dokulnenterade Minskningen?unclassified

Skrattmåsens Larus ridibundus populationsutveckling i Sverige under de senaste 25 åren

Källander

1996

Ornis Svec

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Although starting its northward spread in Sweden earlier, the Black-headed Gull Larus ridibundus showed an almost explosive increase after the Second World War. However, during the last two decades the population has decreased strongly, especially in the agricultural districts of South and South Central Sweden, i.e. those areas which held the majority of the Swedish population. In this paper, data have been compiled by province from various sources (mainly papers and bird reports in local ornithological journals) in an attempt at estimating the size of this decrease and at finding any geographical pattern that might shed light on its cause, or causes. In the main agricultural areas, the decrease of the Black-headed Gull population has been in the order of 70% to 80%, on the island of Öland in the Baltic even more than 95%. Several reports indicate that the decrease started in the species' core areas in the mid-1970s when most of the large colonies diminished or disappeared, but somewhat later in less extreme agricultural areas. The reason for this recent decline is not known. Both deterioration of breeding habitat and predation by mink Mustela vison may explain a certain re-distribution of colonies from eutrophic lakes to offshore islands (and cities and industrial waste land); heavy predation by mink on gull chicks and subsequent abandonment of colonies have been reported. However, parents have abandoned chicks at colonies without documented mink predation, and chick starvation and poor fledging success have also been recorded, however most often in dry years.

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Section: Vad Har Orsakat Den Dokulnenterade Minskningen?unclassified

Skrattmåsens Larus ridibundus populationsutveckling i Sverige under de senaste 25 åren

Källander

1996

Ornis Svec

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“…Black-headed gulls are long-lived birds, with an adult annual survival rate of 0.90 12 and a maximum recorded age of 33 years 13 . Their reproductive output is usually about 1.0–1.5 fledglings per breeding pair 14 , making adult survival one of the major components of population dynamics 15 . Black-headed gulls from breeding colonies in Poland winter in Western and Southern Europe 16 , 17 .…”

Section: Introductionmentioning

confidence: 99%

Helminths of the black-headed gull (Chroicocephalus ridibundus) from breeding colonies in north-central Poland

Stapf,

Rząd,

Królaczyk

et al. 2024

Sci Rep

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Among parasites of the digestive tract of the black-headed gull (Chroicocephalus ridibundus) in Poland, the best known are species of digenetic trematodes and cestodes. Nematodes of this bird species are not well known. Black-headed gulls, due to their varied diet, migration, life in a flock, and changes of habitat, can become infected with various species of helminths, and like synanthropic birds, they can spread the dispersal stages of parasites across urban and recreational areas. In the present study, an attempt was made to identify the helminth fauna of C. ridibundus from breeding colonies in north-central Poland. The aim of the study was to describe the taxonomic structure of parasites of the digestive tract of the black-headed gull and determine the quantitative parameters of their occurrence. A total of 43 black-headed gulls were examined post-mortem for gastrointestinal helminths, resulting in the identification of four cestodes (Paricterotaenia porosa, Lateriporus clerci, Anomotaenia micracantha, and Wardium fusum), three trematodes (Diplostomum pseudospathaceum, Plagiorchis laricola, and Apophallus muehlingi), and three nematodes (Eucoleus contortus, Cosmocephalus obvelatus, and Porrocaecum ensicaudatum). Lateriporus clerci (in adult form), C. obvelatus and P. ensicaudatum (in larval form) were recorded for the first time in the black-headed gull in Poland.

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“…Another possible reason for the Coot decline is the expansion and predation of the introduced American Mink (Neovison vison; Brzeziñski & Marzec 2003). Some authors have not found conclusive evidence for waterfowl populations being limited by Mink predation (Arnold & Fritzell 1987, Halliwell & Macdonald 1996, Bartoszewicz & Zalewski 2003, but others have (Viksne et al 1996, Craik 1997, Ferreras & Macdonald 1999, Nordström et al 2003. Birds are exposed to Mink predation mostly during the breeding season (Gerell 1967), and some groups, such as Rallidae, seem to be particularly vulnerable (Day & Linn 1972, Chanin 1981, Ferreras & Macdonald 1999.…”

Section: Introductionmentioning

confidence: 99%

The effect of nest site on the nesting success of the Coot Fulica atra

Brzezinski,

Jedlikowski,

Zmihorski

2013

Ornis Fenn

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The nesting success of Coots (Fulica atra) breeding at lakes and small inland water bod-ies in the Mazurian Lakeland, Poland, was estimated in 2008 and 2009. Mean nesting suc-cess, indicated by hatching, was 75%; it was highest at lakes in the vicinity of built-up areas (86%), moderate at small inland water bodies (69%) and lowest at lakes far from hu-man settlements (44%). Nesting success improved with decreasing distance to open wa-ter. Our results suggest that small inland water bodies and built-up areas along lake banks may serve as Coot refuges, acting as safeguards against predation, especially by the American Mink.

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Recent trends of the Black-headed Gull Larus ridibundus population in Latvia

Cited by 13 publications

References 1 publication

Skrattmåsens Larus ridibundus populationsutveckling i Sverige under de senaste 25 åren

Skrattmåsens Larus ridibundus populationsutveckling i Sverige under de senaste 25 åren

Helminths of the black-headed gull (Chroicocephalus ridibundus) from breeding colonies in north-central Poland

The effect of nest site on the nesting success of the Coot Fulica atra

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