Seasonal dynamics of rotifer (Rotifera) and crustacean Cladocera and Copepoda) zooplankton of meteorite crater ponds in the nature reserve “Meteoryt Morasko” nature reserve in Poznań, Poland.

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4th_{Conference of the buropean mond Conservation ketwork EbmCkF Berlin EbrknerF, dermany, N}st_{– 4}th_{gune OMNM}

Seasonal dynamics of rotifer (Rotifera) and crustacean

Cladocera and Copepoda) zooplankton of meteorite crater

ponds in the nature reserve “Meteoryt Moraskor nature reserve

in Poznań, Poland.

hK Świdnicki

N

G, kK huczyńskaJhippen

O

C AK Basińska

O

N_{Adam Mickiewicz rniveristy in moznań, Collegium Biologicum, rmultowska U9, SNJSN4}

moznań, moland

O_{aepartment of tater mrotection, caculty of Biology, Adam Mickiewicz rniversity,}

rmultowska U9, SNJSN4 moznań, moland Gcorresponding authorW kippen@hotKpl

kasperKswidnicki@gmailKcom

heywordsW meteorite ponds, zooplankton, species diversity, small water bodies

Meteorite craters, located at the northern boundary of the city of moznań, are situated within an area of oakJhornbeam forest Edalio silvatici-CarpinetumF and are protected as a nature reserveK qhey create one of the greatest sets of craters on earth, formed by an fall of iron meteoritesK lut of seven ditches, three are permanently filled with waterK qhese are shallow, outJflow ponds supplied by rain waterK qhey are characterised by low pe values and frequent oxygen depletionsK aue to such specific conditions, there are no fish observed in these water bodies, which results in a great variation of zooplankton communities of zooplankters, including species adapted to acidic water reactionK

qhe examination took place over four seasons of OMMUK pignificant differences in the zopplankton densities were recorded between particular water bodies and between particular seasons within the yearK wooplankton abundance and the taxonomical composition was related to the occurrence of invertebrate predators Elarva of Culex spK and Chaoborus spKF, as well as to the densities of competitive filterJfeeding representatives of lstracodaK

qhe most varied species composition was observed during the spring monthsK A number of species that occurred at that time were characteristic of waters of low trophy, low pe and characteristic of temporary water bodiesK Moreover, many representatives of the genus aaphnia possessed hemoglobin, possibly due to the reaction to oxygen depletionK Another phenomenon which was observed in the investigated ponds was the frequent occurrence of males in the populations of most cladoceran species, which also reflected specific environmental conditions, unfavourable to many organismsK