The effect of temperature on the development and hatching of resting eggs of non-indigenous predatory cladoceran Cercopagis pengoi in the Gulf of Finland, Baltic Sea |
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Authors: | Sanna Sopanen |
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Institution: | (1) Finnish Environment Institute, P.O. BOX 140, Mechelininkatu 34 a, 00251 Helsinki, Finland |
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Abstract: | The effect of temperature on the development and hatching of resting eggs of the Ponto-Caspian Cercopagis pengoi was studied experimentally in the Gulf of Finland, Baltic Sea. Morphological changes were monitored as the development of
the resting eggs proceeded. Sexual reproduction of the C. pengoi population in the Gulf of Finland was evaluated by combining the data from hatching experiments and resting egg abundances
in the sediment. Development time of resting eggs was dependent on temperature: increase in the temperature shortened the
time needed until hatching. Hatching success was also dependent on incubation temperature. Almost sixfold increase in hatching
success was detected when temperature increased two degrees above the storage temperature. Average resting egg abundances
varied between 0.16 and 0.49 eggs cm−3 in the 0–6 cm sediment layer. |
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