ORIGINAL RESEARCH
Water on the Fen Mire as a Problem in the Protection of Globally Threatened Species: Long-Term Changes in Aquatic Warbler Numbers
Grzegorz Grzywaczewski1, Andrzej Bochniak2, Jarosław Wiącek3, Paweł Łapiński4, Federico Morelli5,6
 
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1University of Life Sciences in Lublin, Department of Zoology, Animal Ecology, and Wildlife Management,
Akademicka 13, PL-20-950 Lublin, Poland
2University of Life Sciences in Lublin, Department of Applied Mathematics and Computer Science,
Głęboka 28, PL-20-950 Lublin, Poland
3Maria Curie-Skłodowska University, Biology and Biochemistry Institute, Department of Nature Conservation,
Akademicka 19, PL-20-033 Lublin, Poland
4The State School of Higher Education in Chełm, Pocztowa 54, PL-22-100 Chełm, Poland
5Faculty of Biological Sciences, University of Zielona Góra, Institute of Biotechnology and Environmental
Protection, Prof. Szafran St. 1, PL 65-516 Zielona Góra, Poland
6Czech University of Life Sciences Prague, Faculty of Environmental Sciences,
Department of Applied Geoinformatics and Spatial Planning,
Kamýcká 129, CZ-165 00 Prague 6, Czech Republic
Online publish date: 2017-03-22
Publish date: 2017-03-22
Submission date: 2016-06-06
Final revision date: 2016-07-04
Acceptance date: 2016-09-20
 
Pol. J. Environ. Stud. 2017;26(2):613–618
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ABSTRACT
This paper presents the results of 11 years study of aquatic warblers in the Roskosz Nature Reserve in eastern Poland. The study was carried out in fen mires near Chełm, in the proximity of the Polish-Ukrainian boundary. The number of aquatic warblers was correlated with the mean water level and with the mean groundwater level. We found that the higher the surface water level, the smaller the number of singing males. The largest number of males (density 10.9 singing males per 10 ha) was found when the mean water level was 23.7 cm, and the smallest number (density 2.1 singing males per 10 ha) when the mean water level was 35.7 cm. These results can be useful in studies that focus on the optimal habitat conditions for breeding of aquatic warblers. This is the first systematic study in calcareous Cladium mariscus fen mires.
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