Abstract
Dormant stages (“resting eggs”) produced by cladocerans can persist for long periods of time in sediments and restore populations once the environmental conditions become favorable again. Lake Blanca, a subtropical shallow eutrophic lake, hosts a cladoceran community dominated by small-sized species. Previous studies on zooplankton resting eggs suggested that the cladoceran genera Daphnia and Simocephalus were present, but they had never been found before in water samples. In the present study, we compared a biweekly active community sampling with the resting egg bank (passive cladoceran community) from littoral and pelagic zones. Moreover, we tested the amount of samples required to have a representative reconstruction of the diversity in both compartments (water and sediment). Lake Blanca showed a relatively high cladoceran species richness (24) in the water column, with rapid temporal replacement. Several species were present in water samples during short temporal windows; therefore, to detect these species a strong sampling effort in terms of temporal frequency and spatial distribution was required. Contrary to our expectations, resting egg community showed a lower diversity than the active community; however, we demonstrated that the analysis of resting egg bank composition can help detect general community structure patterns.
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Acknowledgements
This work was partly funded by the project FCE 2009-2749 (ANII, Uruguay) and the L´Oréal-UNESCO for Women in Science national award to MM. We would like to thank Aguas de la Costa and the personnel at Laguna Blanca for their kind hospitality providing access to the lake and use of their lab facilities and Gissell Lacerot for help during the taxonomic identification process. Suggestions made by Petr Jan Juračka and an anonymous reviewer improved the manuscript substantially. MG was supported by an MSc Scholarship of CAP-UDELAR. NM was supported by Maestría en Ciencias Ambientales, and NM, MM, FTM, and CI were supported by PEDECIBA. NM, MM, FTM, GG, and CI were also supported by SNI (ANII).
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Guest editors: Adam Petrusek & Piet Spaak / Proceedings of the 10th International Symposium on Cladocera
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Gerhard, M., Iglesias, C., Clemente, J.M. et al. What can resting egg banks tell about cladoceran diversity in a shallow subtropical lake?. Hydrobiologia 798, 75–86 (2017). https://doi.org/10.1007/s10750-016-2654-5
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DOI: https://doi.org/10.1007/s10750-016-2654-5