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Spatial distribution and population characteristics of the invasive cladoceran Cercopagis pengoi in the Polish coastal zone seven years after the first record

Bielecka L., Krajewska-Sołtys A., Mudrak-Cegiołka S.

Oceanological and Hydrobiological Studies

2014

Vol. 43, No. 3

201--210

The presented results provide the first comprehensive description of the C. pengoi population and document new records of its expansion to the west in the Polish coastal zone of the Baltic Sea. In June–August 2006, C. pengoi was observed for the first time continuously for nine successive weeks in a broad range of the water temperature and salinity. Its abundance fluctuated from some to several hundred specimens per cubic meter. In July the species was much more abundant in the water far from the coast, whereas in August its maximum density was observed at the most shallow station. The population of C. pengoi occupied the whole water column, from the surface water to 80 m depth, its vertical distribution was not uniform. C. pengoi was represented by specimens from all age-specific morphological stages (BS I–III). The largest part of the population (up to 81.53%) was composed of juvenile specimens (BS I and II). Parthenogenetic females in the second instar constituted the majority of BS II specimens.

New data on the non-indigenous cladoceran Cercopagis pengoi (Ostroumov 1891) in the Gulf of Gdańsk (Baltic Sea) [commun.]

Bielecka L., Mudrak S.

Oceanologia

2010

No. 52 (1)

147-151

New records of Cercopagis pengoi (Ostroumov 1891) in the southern Baltic

Olszewska A.

Oceanologia

2006

No. 48 (2)

319-321

New records of Cercopagis pengoi (Cladocera, Crustacea) are reported for the first time from the central and western part of the Polish zone of the Baltic Sea.

Distribution, population structure and ecosystem effects of the invader Cercopagis pengoi (Polyphemoidea, Cladocera) in the Gulf of Finland and the open Baltic Sea

Litvinchuk L.F., Telesh I.V.

Oceanologia

2006

No. 48 (S)

243-257

Spatial distribution, density, biomass, population structure, predation effects, and the influence of abiotic environmental characteristics (salinity, water temperature, transparency, and depth) on a population of the Ponto-Caspian invasive cladoceran Cercopagis pengoi (Ostroumov, 1891) were studied in the Gulf of Finland and the open Baltic Sea (August 1999 and 2004). In our study in 1999, this species was first recorded in plankton of open south-eastern Baltic waters. The age and sexual structure of the C. pengoi population were interrelated with population density. The strongest impact of C. pengoi predation on the pelagic community in the Gulf of Finland was registered at the stations where the percentage of C. pengoi in the total zooplankton biomass was the highest. The calculated impact values of C. pengoi exceeded those registered a decade ago, during the first years after Cercopagis had invaded the eastern Gulf of Finland.