Počet záznamů: 1

Diel vertical migrations of age 0+ percids in a shallow, well-mixed reservoir

  1. 1.
    0349550 - BC-A 2011 RIV IT eng J - Článek v odborném periodiku
    Kratochvíl, M. - Čech, Martin - Vašek, Mojmír - Kubečka, Jan - Hejzlar, Josef - Matěna, Josef - Peterka, Jiří - Macháček, Jiří - Seďa, Jaromír
    Diel vertical migrations of age 0+ percids in a shallow, well-mixed reservoir.
    Journal of Limnology. Roč. 69, č. 2 (2010), s. 305-310 ISSN 1129-5767
    Grant CEP: GA ČR(CZ) GA206/06/1371; GA ČR(CZ) GP206/09/P266; GA AV ČR(CZ) 1QS600170504
    Výzkumný záměr: CEZ:AV0Z60170517
    Klíčová slova: Perca fluviatilis * Sander lucioperca * DVM * juvenile
    Kód oboru RIV: EH - Ekologie - společenstva
    Impakt faktor: 1.140, rok: 2010

    The distribution of age 0+ perch, Perca fluviatilis and pikeperch, Sander lucioperca was investigated in a shallow reservoir during a 24-h period in late May, using acoustic and netting methods. Diel vertical migrations (DVMs) were acoustically recorded between the layers close to the bottom and the whole water column. The netting data showed a high abundance of larvae and juveniles at night, whereas negligible numbers of age 0+ percids were present in the water column during the day. A strong difference between day and night abundances along with a clear pattern discerned by acoustic methods revealed the DVM of age 0+ percids. Analyses of the fish digestive tract contents indicate that DVM was not governed by feeding behaviour, but rather a defensive strategy against predation. This is in agreement with the size distribution of age 0+ percids, since they were smaller in water column during the day as opposed to the night.
    Trvalý link: http://hdl.handle.net/11104/0189755