11 research outputs found

    The Black Sea–Eastern Mediterranean flyway of the globally threatened European turtle dove (Streptopelia turtur)

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    The European turtle dove Streptopelia turtur (hereafter turtle dove), is a widespread species in the Palearctic. Due to a large and rapid decline in its abundance, it was classified as “vulnerable” on the International Union for Conservation of Nature’s Red List in 2015 and is now regarded as a globally threatened species. The objective of this study was to provide new information on the flyways of this turtle dove population by analyzing available ring recoveries and citizen science sightings data from the Global Biodiversity Information Facility. A new flyway (possibly stretching through the Black and Caspian Seas, Turkey, the Middle East, and Egypt toward the Eastern Sahel) is suggested for turtle doves breeding in Northern and Eastern Europe

    Didžiojo kormorano (Phalacrocorax carbo sinensis) svarba žuvų ištekliams ir parazitinių kirmėlių paplitimui Kuršių marių regione

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    Buvo tiriama vienų didžiausių Europoje didžiojo kormorano kolonijų svarba žuvų ištekliams ir parazitinių kirmėlių paplitimui Kuršių marių regione. Perinčių kormoranų skaičius Kuršių marių pakrantėse per pastaruosius 30 metų išaugo nuo 0 iki 10 000 porų. Nustatyta, kad šiame regione kormoranai maitinasi 25 rūšių žuvimis. Didžiąją jų maisto dalį sudaro verslinės ešerinių (Percidae) ir karpinių (Cyprinidae) šeimų žuvys. Ištyrus 14 didžiųjų kormoranų, rasta 17 helmintų rūšių. Tikėtina, kad itin sparčiai plintantys didieji kormoranai perneša į Kuršių marių regioną naujas parazitinių kirmėlių rūšis. Tirtuose paukščiuose nustatytos penkios anksčiau šiame regione neaptiktos helmintų rūšys. Naujų pavojingų parazitinių kirmėlių Contracaecum rudolphii (galimai patogeninė rūšis žmogui ir naminiams gyvūnams) bei Paradilepis scolecina (dilepidozės Kuršių marių karšiams sukėlėja) atsiradimas Kuršių marių regione (abi rūšys pirmą kartą aptiktos 2004 m.) siejamas su itin greitu didžiojo kormorano populiacijos išplitimu ir gausumuThe population trends, diet composition and helminthes fauna were investigated in the newly established colonies of great cormorant located at the coasts of the Curonian Lagoon of the Baltic Sea. The numbers of breeding birds have increased from 0 in the 1970s to about 10000 pairs in the 2000s. These newly formed colonies of great cormorant are among the largest in Europe. 25 fish species were identified in the diet composition of great cormorants. Freshwater fish species, mostly percids (Percidae) and cyprinids (Cyprinidae), dominate in the diet composition of birds in the Curonian Lagoon area, comprising more than 90% by number and biomass. 17 helminthes species were found in great cormorants. The recent establishment of great cormorant as a new and very abundant species was one of the determining factors for introduction of new parasite species in the Curonian Lagoon area. Nematode Contracaecum rudolphii, potentially pathogenic for animals and people, and cestodes Paradilepis scolecina, which has caused fish disease dilepidosis revealed in bream (Abramis brama), were found in the Curonian Lagoon area in 2004Biologijos katedraGamtos tyrimų centrasVytauto Didžiojo universiteta

    Genetic diversity of tufted ducks (Aythya fuligula, Anatidae) in Eastern Europe

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    The tufted duck (Aythya fuligula, Anatidae) is widespread in the Palaearctic across Northern Eurasia. Birds br eeding in Northern and Eastern Europe are highly migratory, while populations from Western Europe are partially migratory or resident. The aim of this study is to explore genetic variation within and between ducks breeding in Latvia and migrants sampled in North West Russia and Belarus. The technique of random amplified polymorphic DNA was applied using five random primers (ol-1, ol-9-12). Genetic variability was measured for all tufted ducks investigated and for different sub-populations from various regions. Individual genetic structure and genetic variability was higher in ducks collected from Latvia. Gene diversity of amplified DNA bands in birds of Latvian origin was 24% with 80% polymorphism. Means of gene diversity and polymorphism for tufted ducks sampled in other countries varied from 12 to 14% and from 27 to 40%, respectively. A high number of unique bands characterized ducks breeding in Latvia. The oligonucleotide primers used in this study were suitable to analyze differences among tufted ducks of different origin. Possible explanations for the variation observed among the studied ducks are discussedBiologijos katedraGamtos tyrimų centrasVytauto Didžiojo universiteta

    Woodland and urban populations of the woodpigeon Columba palumbus in the eastern Baltic region

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    We investigated breeding densities and distribution of the woodpigeon Columba palumbus in woodland and urban habitats of Lithuania, Belarus and the Kaliningrad oblast (administrative district) of Russia. In Lithuania and Belarus, where the urbanisation process of the woodpigeon is in an initial phase, breeding densities in woodland habitats are higher than in urban areas. In the Kaliningrad oblast of Russia, where abundant urban populations have been established in towns for decades, breeding densities in urban habitats are significantly higher than in woodland sites. Available data indicate that at present the eastern border of the European distribution of well-established urban woodpigeon populations extends approximately along the western border of Lithuania, Belarus and UkraineBiologijos katedraGamtos tyrimų centrasVytauto Didžiojo universiteta

    Karvelio keršulio (Columba palumbus) migracijos kelių Europoje tyrimai patogeninių ligų prevencijai ir kontrolei taikant genetinius metodus

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    Mitochondrinės DNR D-kilpos sekų analizė panaudota karvelio keršulio (Columba palumbus) migracijos kelių tyrimams Europoje. Karvelis keršulis (daugelio patogeninių ligų ir parazitų pernešėjas) yra labiausiai medžiojama paukščių rūšis Europoje, todėl nustatyti šių paukščių migracinius kelius būtina patogeninių ligų kontrolei ir prevencijai. Ištyrus 360 karvelio keršulio mėginių (surinktų Rusijoje, Baltarusijoje, Lietuvoje, Švedijoje, Vengrijoje, Prancūzijoje, Ispanijoje ir Portugalijoje), nustatyti 89 skirtingi haplotipai, priskirti penkioms haplogrupėms. Genetiniais metodais nustatyta, kad dauguma Baltijos regione perinčių karvelių keršulių žiemoja Ispanijoje ir Portugalijoje. Jų migracijos kelias iš perėjimo vietų į žiemojimo vietas driekiasi Baltijos ir Šiaurės jūrų pakrantėmis. Skirtingas migracijos kelias būdingas karveliams keršuliams, perintiems Vengrijoje. Šie paukščiai žiemoja vakarinėse Viduržemio jūros pakrantėse. Karveliai keršuliai yra potencialūs įvairių patogenų pernešėjai. Atsiradus patogeninių ligų židiniams įvairiuose Europos regionuose, prieš numatant būtinąsias prevencines priemones, labai svarbu įvertinti karvelių keršulių migracijos keliusThe population genetic structure of the Woodpigeon (Columba palumbus) in Europe was studied analyzing the distribution of different D-loop haplotypes among bird samples, collected in various breeding and wintering sites of the species (in Russia, Belarus, Lithuania, Sweden, Hungary, France, Spain and Portugal). Totally 89 different haplotypes ascertained as belonging to 5 haplo-groups were identified after examination of partial D-loop sequences consisting of 359 bp mtDNR fragments derived from 360 samples. The results of this study indicate that the Eastern Atlantic Flyway is used by Woodpigeons breeding in NW Russia, Belarus, Lithuania, Sweden and wintering mainly in the Iberian Peninsula. A distinct population genetic structure is characteristic of Woodpigeons breeding in Hungary and using the Mediterranean Flyway. The designation of main flyways of Woodpigeons in Europe is necessary for the control and prevention of potential spread of pathogenic diseases and parasites, as this species is the most important game bird in EuropeBiologijos katedraGamtos tyrimų centrasVytauto Didžiojo universiteta

    Waterbird Populations and Pressures in the Baltic Sea

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    This report outlines the results of the internationally coordinated census of wintering waterbirds in the Baltic Sea 2007-2009 undertaken under the SOWBAS project (Status of wintering Waterbird populations in the Baltic Sea). The estimated total number of wintering waterbirds was 4.41 million compared to 7.44 million during the last co-ordinated census 1992-1993.  Despite the general declines stable or increasing populations of herbivorous species were recorded. While benthic carnivores with a coastal distribution have either shown moderate declines, stable or increasing populations seaducks with an offshore distribution have declined seriously. Based on analyses of trends in wintering waterbirds and pressures indicators are suggested as performance indicators in relation to the international and national actions taken to reduce the anthropogenic pressures in the Baltic Sea
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