Počet záznamů: 1

The stabilizing effect of resting eggs banks of the Daphnia longispina species complex for longitudinal taxon heterogeneity in long and narrow reservoirs

  1. 1.
    0343442 - BC-A 2011 RIV NL eng J - Článek v odborném periodiku
    Vaníčková, I. - Seďa, Jaromír - Petrusek, A.
    The stabilizing effect of resting eggs banks of the Daphnia longispina species complex for longitudinal taxon heterogeneity in long and narrow reservoirs.
    Hydrobiologia. Roč. 643, č. 1 (2010), s. 85-95 ISSN 0018-8158.
    [International Symposium on Cladocera /8./. Aguascalientes, 21.10.2008-25.10.2008]
    Grant CEP: GA AV ČR(CZ) IAA600960901; GA ČR(CZ) GA206/04/0190; GA AV ČR(CZ) 1QS600170504
    Výzkumný záměr: CEZ:AV0Z60170517
    Klíčová slova: Daphnia * resting eggs * ephippia * canyon-shaped reservoir * hybridization
    Kód oboru RIV: DA - Hydrologie a limnologie
    Impakt faktor: 1.964, rok: 2010

    We compared the spatial distribution of the Daphnia longispina complex (D. longispina, D. galeata, D. cucullata, and their hybrids) in the active water column community and in resting egg banks in five long narrow reservoirs in the Czech Republic. Ephippia abundance in the sediments significantly increased in the downstream direction and similarly to the active zooplankton community, in which D. cucullata and D. longispina tended to occur at opposite ends of the reservoirs, taxa of resting eggs revealed a spatially diversified pattern. High relative abundances of hybrids (up to 16% of resting eggs, and 74% of Daphnia in the water column) confirm that interspecific hybridization is frequent in reservoirs, and some hybrids are successfully compete with the parents. We assume that the spatial heterogeneity of Daphnia taxonomic composition in reservoirs, being affected by the seasonal selection of taxa, is substantially strengthened by the presence of spatially heterogeneous egg banks.
    Trvalý link: http://hdl.handle.net/11104/0185922