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Title:	Populations of two predatory cladocerans in the Vistula Lagoon- the native Leptodora kindtii and the non-indigenous Cercopagis pengoi
Authors:	Polunina Julia J.
Abstract:	The distribution and population structure of two predatory cladocerans – the native Leptodora kindtii (Focke, 1844) and the non-indigenous Cercopagis pengoi (Ostroumov, 1891), were studied in the Vistula Lagoon (Baltic Sea) during the 1996-2000 period. A species of Ponto- Caspian origin, C. pengoi was introduced to the lagoon by sea currents in August 1999. Prior to this, L. kindtii was not recorded every year in the study area. In 1999 and 2000, both Leptodora and Cercopagis were recorded in the lagoon. Since the C. pengoi invasion, the area of L. kindtii occurrence has increased in the direction of the more saline part, although high densities occurred only in the freshwater regions. C. pengoi occurred throughout the lagoon. The population of C. pengoi was represented by individuals from 0.8 to 2.75 mm in length and consisted of juveniles, males, and parthenogenetic (with 6-15 eggs) and gamogenetic (with 1-2 resting eggs) females. No changes in the structure of the L. kindtii population, such as the appearance of sexual generation, were noted.
DOI:
Type of paper:	Original research paper
Pages:	249 to 260
Cytation:	Polunina J.J., 2005, Populations of two predatory cladocerans in the Vistula Lagoon- the native Leptodora kindtii and the non-indigenous Cercopagis pengoi, Ocean. Hydrob. Studies, 34(Supl. 1): 249-260
Keywords:	Vistula Lagoon, Cercopagis pengoi, Leptodora kindtii, invasion, distribution, population structure
Year:	2005
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