Effects of extreme floods on the Daphnia ephippial egg bank in a long narrow reservoir

0360688 - BC 2012 RIV IT eng J - Journal Article
Vaníčková, Ivana - Seďa, Jaromír - Macháček, Jiří - Petrusek, A.
Effects of extreme floods on the Daphnia ephippial egg bank in a long narrow reservoir.
Journal of Limnology. Roč. 70, č. 2 (2011), s. 369-377. ISSN 1129-5767. E-ISSN 1723-8633.
[International Conference on Invertebrate Reproduction and Development in the Age of Genetic Modifications. Praha, 16.08.2010-20.08.2010]
R&D Projects: GA ČR(CZ) GA206/04/0190; GA AV ČR(CZ) IAA600960901; GA AV ČR(CZ) 1QS600170504
Institutional research plan: CEZ:AV0Z60170517
Keywords : resting eggs * ephippium * flood * canyon-shaped reservoir * Daphnia longispina complex
Subject RIV: DA - Hydrology ; Limnology
Impact factor: 1.207, year: 2011

Daphnia egg banks are important reservoirs of dormant stages. Although the hatching is probably of minor importance in water bodies with a permanent population, this may differ after major disturbances. In 2006, two 500-year floods hit the Vranov Reservoir (Czech Republic), in which we had investigated population of the Daphnia longispina complex in preceding years. In this study we focused on the impact of those floods on the dormant egg bank. A year after the floods, we did not observe any sediment layer that would be devoid of ephippia, however, we observed a significant increase in the proportion of empty ephippia and a decrease in the proportion of those containing eggs. We attribute these changes to flood disturbance, which caused redistribution of stored ephippia and those detached from the shoreline. Deposited to shallow parts of reservoir after the floods, dormant eggs could therefore receive and respond to hatching stimuli, and contributed to Daphnia recovery after the flood.
Permanent Link: http://hdl.handle.net/11104/0198179