Počet záznamů: 1

Location and timing of the deposition of egg strands by perch (Perca fluviatilis L.): the roles of lake hydrology, spawning substrate and female size

  1. 1.
    0367122 - BC-A 2012 RIV FR eng J - Článek v odborném periodiku
    Čech, Martin - Peterka, Jiří - Říha, Milan - Muška, Milan - Hejzlar, Josef - Kubečka, Jan
    Location and timing of the deposition of egg strands by perch (Perca fluviatilis L.): the roles of lake hydrology, spawning substrate and female size.
    Knowledge and Management of Aquatic Ecosystems. -, č. 403 (2011), 08p1-08p12 ISSN 1961-9502
    Grant CEP: GA ČR(CZ) GP206/09/P266
    Výzkumný záměr: CEZ:AV0Z60170517
    Klíčová slova: SCUBA diving * aquatic vegetation * lake management * common stonewort Chara vulgaris * common reed Phragmites communis
    Kód oboru RIV: EG - Zoologie
    Impakt faktor: 1.520, rok: 2011

    The reproduction biology of perch was studied in relation to lake hydrology, spawning substrate and female size in Chabařovice Lake, Czech Republic. An extreme displacement of water mass, induced by a long-lasting strong wind, caused the abundance of egg strands to differ significantly between individual parts of the lake. On average, 91% of perch spawning activity occurred at depths greater than 3 m. The mean concentration of dissolved organic carbon (DOC) indicated that the lake belongs to the category where DOC influencing the penetration of ultraviolet radiation, is not responsible for the deep deposition of egg strands by perch. Most probably, the avoidance of shallow layers (less than 3 m deep) results from strong wind/waves coming from any direction. Larger perch females started to spawn earlier than their smaller conspecifics and they used shallower layers for depositing their egg strands.
    Trvalý link: http://hdl.handle.net/11104/0201898