Počet záznamů: 1

Seasonal dynamics in population characteristics of European bitterling Rhodeus amarus in a small lowland river

  1. 1.
    0358427 - UBO-W 2012 RIV GB eng J - Článek v odborném periodiku
    Konečná, Markéta - Reichard, Martin
    Seasonal dynamics in population characteristics of European bitterling Rhodeus amarus in a small lowland river.
    Journal of Fish Biology. Roč. 78, č. 1 (2011), s. 227-239 ISSN 0022-1112
    Grant CEP: GA ČR GA206/09/1163
    Výzkumný záměr: CEZ:AV0Z60930519
    Klíčová slova: bitterling * annual life cycle * ecophysiology * gonado-somatic index * lipid content * somatic condition
    Kód oboru RIV: EG - Zoologie
    Impakt faktor: 1.685, rok: 2011

    The seasonal dynamics of biological traits in a population of European bitterling Rhodeus amarus from a small river in central Europe (River Kyjovka) were investigated from April 2007 to March 2008. The reproductive season lasted from early April to mid-June, with a peak in late April when >50% of females possessed ripe eggs in their ovaries. The sex ratio was female-biased, with a higher bias following the peak in reproduction, suggesting higher mortality of males than females over the reproductive period. The population was effectively annual, with a major decrease in adult fish abundance at the end of the reproductive period. Highest relative lipid content and condition factor were observed in February, both decreasing with an increase in investment into gonads. Seasonal dynamics in somatic condition, relative lipid content and gonad mass, and their comparison with other R. amarus populations, suggest that the study population allocated a disproportionally high level of resources to reproduction.
    Trvalý link: http://hdl.handle.net/11104/0196479