References
- Altınsaçlı, S.; Sevilla, J.R.; Altınsaçlı, S., On occurrence of Spongilla lacustris (Linnaeus, 1759) from Lake Saklıgöl, Kandıra District, Turkey, Journal of Entomology and Zoology Studies, 2014, 2(3), 68-73.
- Lo Giudice, A.; Rizzo, C., Freshwater Sponges as a Neglected Reservoir of Bacterial Biodiversity, Microorganisms, 2024, 12, 25. https://doi.org/10.3390/microorganisms12010025.
- Gruppuso, L.; Fenoglio, S.; Moriondo, M.; Bo, T., Environmental factors affecting the distribution of Spongillidae (Porifera) in an artificial channel, in north-western Italy, Limnetica, 2025, 44(2), 000-000. DOI: 10.23818/limn.44.13.
- Mellado-Díaz, А.; Verdugo-Althöfer, М.; Monteagudo, L.; Moreno, J.L., First records of Ulvella spongophila (Ulvophyceae: Ulvellaceae) for the Palaearctic region: the discovery of four populations in the SW Iberian Peninsula, Limnetica, 2023, 42(2), 175-187. DOI: 10.23818/limn.42.13.
- Oscoz, J.; Tom´as, P.; Dur´an, C., New records of Eunapius fragilis (Leidy, 1851) and Ephydatia fluviatilis (Linnaeus, 1759) (Porifera, Spongillidae) in Ebro River Basin (N Spain), Limnetica, 2009, 28(2), 185-188.
- Todorov, M.; Kenderov, M.; Botev, I.; Hubenov, Z.; Trichkova, T., First Records of Pectinatella magnifica (Leidy, 1851) (Bryozoa: Plumatellida: Pectinatellidae) in the Bulgarian Shoreline Zone of the Danube River, Acta Zoologica Bulgarica, 2020, 72(4), 611-617.
- Ognjanova-Rumenova, N.G.; Rashkova, L.E.; Botev, I.S.; Trichkova, T.A., Diversity of benthic diatoms in relation to environmental factors in two Bulgarian reservoirs, Phytologia Balcanica, 2013, 19(3), 307–322.
- Molloy, D.P.; Karatayev, A.Y.; Burlakova, L.E.; Kurandina, D.P.; Laruelle, F., Natural enemies of zebra mussels: predators, parasites, and ecological competitors, Reviews in fisheries science, 1997, 5(1), 27-97. DOI: 10.1080/10641269709388593.
- Golemansky, V. et al. (Eds), Red Data Book of the Republic of Bulgaria. Volume 2. Animals. BAS & MoEW, Sofia, 2015.
- Podlesnik, J.; Klokocovnik, V.; Klenovsek, T.; Janzekovic, F.; Devetak, D., First records of spongillaflies (Neuroptera: Sisyridae) in Serbia and Bosnia and Herzegovina, with notes on their occurrence in the Balkan countries, Turkish Journal of Zoology, 2017, 41(1), Article 19. https://doi.org/10.3906/zoo-1508-48. Available at: https://journals.tubitak.gov.tr/zoology/vol41/iss1/19.
- European Commission, Communication from the Commission to the European Parliament, The Council, the European Economic and Social Committee and the Committee of the Regions. EU Biodiversity Strategy for 2030. Bringing nature back into our lives. Brussels, 20.5.2020, COM (2020) 380 final.
- Grizzetti, B.; Liquete, C.; Pistocchi, A.; Vigiak, O.; Zulian, G.; Bouraoui, F.; De Roo, A.; Cardoso, A.C., Relationship between ecological condition and ecosystem services in European rivers, lakes and coastal waters. Science of the Total Environment, 2019, 671, 452–465. https://doi.org/10.1016/j.scitotenv.2019.03.155.
- European Commission, 2019. Commission staff working document. Fitness Check of the Water Framework Directive, Groundwater Directive, Environmental Quality Standards, Directive and Floods Directive. Brussels, 10.12.2019, SWD, 439 final. Available from: https://commission.europa.eu/publications/fitness-check-water-framework-directive-and-floods-directive_en#details.
- Andjus, S; Nikolic, N; Dobricic, V; Marjanovic, A.; Gacic, Z.; Brankovic, G.; Rakovic, M.; Paunović, M., Contribution to the knowledge on the distribution of freshwater sponges – the Danube and Sava rivers case study. 2018, Journal of Limnology, 2018; 77(2): 199-208, DOI: 10.4081/jlimnol.2017.1677.
- Karen, L. Evans; David, J. S., Montagnes, Freshwater sponge (Porifera: Spongillidae) distribution across a landscape: environmental tolerances, habitats, and morphological variation.
- Marinov, I., Hydrological reference book of the rivers in People’s Republic of Bulgaria, Volume one, State Publishing House Science and Art, Sofia, 1957, 328 p. (in Bulgarian).
- River Basin Management Plan (RBMP), River basin management plan of the Black Sea Basin Directorate (2016-2021). Decision 1107/29.12.2016 г. of the Council of Ministers, 2016 (in Bulgarian). Available from: https://www.bsbd.org/bg/index_bg_5493788.html.
- Skoulikidis, N.T.; Zogaris, S.; Karaouzas, I., Rivers of the Balkans. p. 593-653. In: Tockner, K.; Zarfl, C.; Robinson, C.T. (Eds.), Rivers of Europe. Elsevier, Amsterdam, 2022.
- Doychev, D.D., Longitudinal recovery gradient of macroinvertebrates during different hydrological scenarios in a downstream river reach. Journal of Limnology, 2023, 82, 2125. DOI: 10.4081/jlimnol.2023.2125.
- Doychev, D.D.; Taneva, L.R., An unpolluted regulated stream and its recovery gradient dependency from environmental variables. Limnetica, 2025, 44(1), 000-000 (2025). DOI: 10.23818/limn.44.11.
- Mellado-Díaz, A.; Sánchez-González, J.R.; Guareschi, S.; Magdaleno, F.; Velasco, M.T., Exploring longitudinal trends and recovery gradients in macroinvertebrate communities and biomonitoring tools along regulated rivers. Sci. Total Environ. 2019, 695, 133774.
- Tarkowska‐Kukuryk, M.; Grzywna, A., Macrophyte communities as indicators of the ecological status of drainage canals and regulated rivers (Eastern Poland). Environ Monit Assess. 2022, 194, 210, https://doi.org/10.1007/s10661-022-09777-0.
- Pardo, I.; Álvarez, M.; Casas, J.; Moreno, J.L.; Vivas, S.; Bonada, N.; Alba-Tercedor, J.; Jáimez-Cuéllar, P.; Moyà, G.; Prat, N., El hábitat de los ríos mediterráneos. Diseño de un índice de diversidad de hábitat. Limnetica, 2002, 21(3-4), 115-133.
- Munne, A. ; Prat, N.; Sol, C.A.; Bonada, N.; Rieradevall, M., A simple field method for assessing the ecological quality of riparian habitat in rivers and streams: QBR index. Aquatic Conservation: Marine and Freshwater Ecosystems, 2003, 13, 147–163.
- Cocchiglia, L.; Kelly-Quinn, M.; Lucey, J., Classification of Freshwater Sponge Collection at EPA Kilkenny. A Small Scale Study under the Science, Technology, Research and Innovation for the Environment (STRIVE) Programme 2007–2013, Environmental Protection Agency, 2013.
- Manconi, R.; Pronzato, R., Suborder Spongillina subord. nov.: Freshwater Sponges. In: Hooper, J.N.A.; Van Soest, R.W.M. (Eds.), Systema Porifera: A Guide to the Classification of Sponges, Kluwer Academic/Plenum Publishers, New York, 2002.
- Ordinance No.Н-4 from September 14, 2012 for surface water characterization Government of Bulgaria, 2012 (in Bulgarian). Available from: https://www.moew.government.bg/static/media/ups/tiny/filebase/Water/Legislation/Naredbi/vodi/Naredba%20H-4.pdf.
- Lucey, J.; Cocchiglia, L., Distribution of sponges (Porifera: Spongillidae) in southern Irish rivers and streams. Biology and Environment: Proceedings of the Royal Irish Academy, 2014, 114B(2), 89-100, https://doi.org/10.3318/BIOE.2014.24.