Flood duration determines the reproduction success of fish in artificial oxbows in a floodplain of a potamal river

0348350 - ÚBO 2011 RIV DK eng J - Journal Article
Janáč, Michal - Ondračková, Markéta - Jurajda, Pavel - Valová, Zdenka - Reichard, Martin
Flood duration determines the reproduction success of fish in artificial oxbows in a floodplain of a potamal river.
Ecology of Freshwater Fish. Roč. 19, č. 4 (2010), s. 644-655. ISSN 0906-6691. E-ISSN 1600-0633
R&D Projects: GA MŠMT LC522
Institutional research plan: CEZ:AV0Z60930519
Keywords : young-of-the-year * flood pulse concept * regression * recruitment * reproductive guilds
Subject RIV: EH - Ecology, Behaviour
Impact factor: 1.432, year: 2010

Fish reproduction was studied in six man-made water bodies (borrow pits) adjacent to the channelised Dyje River (Danube basin) over five seasons. Terrestrial vegetation provided spawning and nursery habitats when inundated by raised water levels in the borrow pits (hereafter referred to as ‘floods’). The diversity of 0+ fish and the density of 0+ cyprinids were positively correlated with flood duration in previous months. The density of 0+ Perca fluviatilis was independent of the flood duration. The density of spawners and predators did not influence the diversity of 0+ fish and the density of 0+ cyprinids. Receding flood and associated lack of shelters resulted in decreasing density of 0+ cyprinids. Prolonged floods facilitated the survival of 0+ fish and resulted in high 1+ cyprinid density in the following season. Specific hydromorphological conditions are necessary to enable successful spawning and provide shelters for 0+ fish in artificial water bodies.
Permanent Link: http://hdl.handle.net/11104/0188904