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Dietary specifications reflect the feeding behaviour of the European otter (Lutra lutra) in “Strandzha” Natural Park (Bulgaria)

Republic. Aquaculture International. 2003 , 11, 389–396. [4] Kortan D, Adamek Z, Polakova S. Winter predation by otter, Lutra lutra on carp pond systems in South Bohemia (Czech Republic). Folia Zool. 2007 , 56, 4, 416–428. [5] English Nature. Retrieved 2010 , 03-15. [6] Conroy J, Chanin P. The status of the Eurasian otter ( Lutra lutra ) in Europe – a review. Proceedings of the first otter toxicology conference, Eds., Conroy, J. W. H., Yoxon, P. and Gutleb, A. C.) 2000 , 7-29. [7] Ruiz-Olmo J, Loy A, Cianfrani C, Yoxon P, Yoxon G, de Silva PK

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Elemental composition of surface soils in Nature Park Shumen Plateau and Shumen City, Bulgaria

, K.; Karatoteva, D.; Venkova, R., Soil Contamination in Forest and Industrial Regions of Bulgaria, IntechOpen , 2016 . doi:10.5772/64716. [6.] Malinova, D., Investigation on Soil Polution of Different Landscapes on the Territory of Bulgarka Natural Park, Forest Science , 2010 , 2 :75-84. https://naukazagorata.files.wordpress.com/2013/02/article-2-2010-full-text-71.pdf [7.] Djingova, R.; Wagner, G.; Peshev, D., Heavy metal distribution in Bulgaria using Populus nigra ‘Italica’ as a biomonitor, Sci Total Environ , 1995 , 172 :151-158. doi:10

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