[
[1] Bajkiewicz-Grabowska E., A. Hillbricht-Ilkowska & B. Zdanowski, 1992, Assesment of the eutrophication, water quality and susceptibility to degradation of lakes in the Wigry National Park. [in:] Lakes of the Wigry National Park: Eutrophication and management, ed. B. Zdanowski, Zeszyty Naukowe PAN, 3: 163–191 (in Polish)
]Search in Google Scholar
[
[2] Benzie J.A.H., 2005, Cladocera: The genus Daphnia (including Daphniopsis), Backhuys Publishers, Leiden
]Search in Google Scholar
[
[3] Billiones R., M. Brehm J. Klee & K. Schwenk, 2004, Genetic identification of Hyalodaphnia species and interspecific hybrids, Hydrobiologia 526: 43–53 http://dx.doi.org/10.1023/B:HYDR.0000041615.65087.0610.1023/B:HYDR.0000041615.65087.06
]Search in Google Scholar
[
[4] Brzeziński T., 2010, Ecology of three sympatric Daphnia species and their hybrids, PhD. thesis, Department of Hydrobiology, University of Warsaw (in Polish, with English summary)
]Search in Google Scholar
[
[5] Brzeziński T. & E. Von Elert, 2007, Biochemical food quality effects on a Daphnia hybrid complex, Limnol. Oceanogr. 52: 2350–2357 http://dx.doi.org/10.4319/lo.2007.52.6.235010.4319/lo.2007.52.6.2350
]Search in Google Scholar
[
[6] Burke J.M. & M.L. Arnold, 2001, Genetics and the fitness of hybrids, Ann. Rev. Gen. 35: 31–52 http://dx.doi.org/10.1146/annurev.genet.35.102401.08571910.1146/annurev.genet.35.102401.08571911700276
]Search in Google Scholar
[
[7] Demel K., 1924, At Wigry lake — naturalists sketches, Biblioteka Przyrodnika, Cieszyn, pp. 1–130 (in Polish)
]Search in Google Scholar
[
[8] Dowling T.E. & C.L. Secor, 1997, The role of hybridization and introgression in the diversification of animals, Ann. Rev. Ecol. Syst. 28: 593–619 http://dx.doi.org/10.1146/annurev.ecolsys.28.1.59310.1146/annurev.ecolsys.28.1.593
]Search in Google Scholar
[
[9] Ejsmont-Karabin J. & A. Karabin, 1998, The complex of thermally stratified lakes of the Wigry National Park — ecological assesment using zooplankton indices. [in:] Management of water ecosystems in protected areas, Wigry National Park, Krzywe p. 6 (in Polish)
]Search in Google Scholar
[
[10] Epifanio J. & J. Nielsen, 2001, The role of hybridization in the distribution, conservation and management of aquatic species, Rev. Fish Biol. Fish. 10: 245–251 http://dx.doi.org/10.1023/A:101672913229710.1023/A:1016729132297
]Search in Google Scholar
[
[11] Giessler S., 1997, Analysis of reticulate relationship within the Daphnia longispina complex. Allozyme phenotype and morphology, J. Evol. Biol. 10: 87–105 http://dx.doi.org/10.1007/s00036005001110.1007/s000360050011
]Search in Google Scholar
[
[12] Gliwicz Z.M., A. Jawiński & M. Pawłowicz, 2004, Cladoceran densities, day-to-day variability in food selection by smelt, and the birth rate compensation hypothesis, Hydrobiologia 526: 171–186 http://dx.doi.org/10.1023/B:HYDR.0000041605.72338.2210.1023/B:HYDR.0000041605.72338.22
]Search in Google Scholar
[
[13] Hebert P.D.N., 1985, Interspecific hybridization between cyclic parthenogens, Evolution 39: 216–220 http://dx.doi.org/10.2307/240853410.2307/2408534
]Search in Google Scholar
[
[14] Hebert P.D.N. & M.J. Beaton, 1993, Methodologies for allozyme analysis using cellulose acetate electrophoresis — a practical handbook, Helena Laboratories, Beaumont, Texas
]Search in Google Scholar
[
[15] Hermanowicz W., W. Dożańska, J. Dojlido & B. Koziorowski, 1976, Physical and chemical examination of water and waste-water, Arkady, Warszawa (in Polish)
]Search in Google Scholar
[
[16] Janus R., 1992, The zooplankton of lake Roś: seasonal changes of abundance and distribution. MSc. thesis, Department of Hydrobiology, University of Warsaw (in Polish)
]Search in Google Scholar
[
[17] Jańczak J. (ed.). 1999, The atlas of Polish lakes. p. III. Lakes of Mazurian Lakeland and Souther Poland, Bogucki Wydawnictwo Naukowe S.C., Poznań (in Polish)
]Search in Google Scholar
[
[18] Kamiński M., 1999, Lake Wigry — the lake adopted by International Association of Theoretical and Applied Limnology, Polish J. Ecol. 47: 215–224
]Search in Google Scholar
[
[19] Keller B. & P. Spaak, 2004, Nonrandom sexual reproduction and diapausing egg production in a Daphnia hybrid species complex, Limnol. Oceanogr. 49: 1393–1400 http://dx.doi.org/10.4319/lo.2004.49.4_part_2.139310.4319/lo.2004.49.4_part_2.1393
]Search in Google Scholar
[
[20] Mallet J., 2005, Hybridization as an invasion of the genome, Trends Ecol. Evol. 20: 229–237 http://dx.doi.org/10.1016/j.tree.2005.02.01010.1016/j.tree.2005.02.01016701374
]Search in Google Scholar
[
[21] Nason J. & N.C. Ellstrand, 1993, Estimating the frequencies of genetically distinct classes of individuals in hybridized populations, J. Heredity 84: 1–12 10.1093/oxfordjournals.jhered.a111268
]Search in Google Scholar
[
[22] Peakall R. & P. Smouse, 2006, GENEALEX6: genetic analysis in Excel. Population genetic software for teaching and research, Mol. Ecol. Notes 6: 288–295 http://dx.doi.org/10.1111/j.1471-8286.2005.01155.x10.1111/j.1471-8286.2005.01155.x
]Search in Google Scholar
[
[23] Pijanowska J., 1980, Zooplankton communities in nine Masurian lakes, Ekologia Polska 28: 451–465
]Search in Google Scholar
[
[24] Petrusek A., A. Hobaek, J.P. Nilssen, M. Skage, M. Cerny, N. Brede and K. Schwenk, 2008, A taxonomic reapprisal of the European Daphnia longispina complex (Crustacea, Cladocera, Anomopoda), Zool. Scripta 37: 507–519 http://dx.doi.org/10.1111/j.1463-6409.2008.00336.x10.1111/j.1463-6409.2008.00336.x
]Search in Google Scholar
[
[25] Petrusek A., J Seda, J. Machácek, S. Ruthová and P. Smilauer, 2008, Daphnia hybridization along ecological gradients in pelagic environments: the potential for the presence of hybrid zones in plankton, Phil. Trans. R. Soc. B 363: 2931–41 http://dx.doi.org/10.1098/rstb.2008.002610.1098/rstb.2008.0026260673318508758
]Search in Google Scholar
[
[26] Rieseberg L. H., 1997, Hybrid origins of plant species, Ann. Rev. Ecol. Syst. 28: 359–389 http://dx.doi.org/10.1146/annurev.ecolsys.28.1.35910.1146/annurev.ecolsys.28.1.359
]Search in Google Scholar
[
[27] Rybak J.I., 1993, An overwiev of freshwater invertebrates: Cladocera, Biblioteka Monitoringu Środowiska, Warszawa, pp. 30 (in Polish)
]Search in Google Scholar
[
[28] Rybak J.I., 1994, An overwiev of freshwater invertebrates: Copepoda, Biblioteka Monitoringu Środowiska, Warszawa, pp. 31 (in Polish)
]Search in Google Scholar
[
[29] Rykowska A., 1989, Vertical distribution of four Daphnia species in lake Roś. MSc. thesis, Department of Hydrobiology, University of Warsaw (in Polish)
]Search in Google Scholar
[
[30] Sakwinska O. & P. Dawidowicz, 2005, Life history strategy and depth selection behaviour as alternative antipredator defences among natural Daphnia hyalina populations, Limnol. Oceanogr. 50: 1284–1289 http://dx.doi.org/10.4319/lo.2005.50.4.128410.4319/lo.2005.50.4.1284
]Search in Google Scholar
[
[31] Schwenk K., A. Sand, M. Boersma, M. Brehm, E. Mader, D. Offerhaus & P. Spaak, 1998, Genetic markers, genealogies and biogeografic patterns in the cladocera, Aquatic Ecol. 32: 37–51 http://dx.doi.org/10.1023/A:100993990119810.1023/A:1009939901198
]Search in Google Scholar
[
[32] Schwenk K. & P. Spaak, 1997, Ecology and genetics of interspecific hybridization in Daphnia, [in] Evolutionary ecology of freshwater animals, Eds. Streit B., T. Stadler & C.M. Lively, Birkhauser Verlag, pp. 199–229 10.1007/978-3-0348-8880-6_8
]Search in Google Scholar
[
[33] Spaak P., 1996, Temporal changes in the genetic structure of the Daphnia species complex in Tjeukemeer, with evidence for baccrossing, Heredity 76: 539–548 http://dx.doi.org/10.1038/hdy.1996.7710.1038/hdy.1996.77
]Search in Google Scholar
[
[34] Spaak P. & J.R. Hoekstra, 1995, Life history variation and coexistence of a Daphnia hybrid with its parental species, Ecology 76: 553–564 http://dx.doi.org/10.2307/194121310.2307/1941213
]Search in Google Scholar
[
[35] Spaak P. & J.R. Hoekstra, 1997, Fish predation on a Daphnia hybrid species complex: a factor explaining species coexistence? Limnol. Oceanogr. 42: 753–762 http://dx.doi.org/10.4319/lo.1997.42.4.075310.4319/lo.1997.42.4.0753
]Search in Google Scholar
[
[36] Weider L.J., 1993, Niche breadth and life history variation in a hybrid Daphnia complex, Ecology 74: 935–943 http://dx.doi.org/10.2307/194081710.2307/1940817
]Search in Google Scholar
[
[37] Wolf H.G., & M.A. Mort, 1986, Inter-specific hybridization underlies phenotypic variability in Daphnia populations, Oecologia 68: 507–511 http://dx.doi.org/10.1007/BF0037876310.1007/BF0037876328311704
]Search in Google Scholar
[
[38] Wolińska J., B. Keller, K. Bittner, S. Lass & P. Spaak, 2004, Do parasites lower Daphnia hybrid fitness? Limnol. Oceanogr. 49: 1401–1407 http://dx.doi.org/10.4319/lo.2004.49.4_part_2.140110.4319/lo.2004.49.4_part_2.1401
]Search in Google Scholar
