The effect of temperature on the dynamics of common bream <i>Abramis brama</i> migrations between the reservoir and its tributary

An active preference for higher temperatures within a physiological optimum is beneficial animal movement. For example, ascending induce an increase in cyprinid fish metabolism and swimming ability. Spring upstream migrations driven by the search resources may be related to these increases. Conversely, downstream autumn follow decrease temperature. When are resources, food availability reproduction, or avoid predators, then temperature effect can reduced approximately threshold that up- and/or To test this assumption, we tracked seasonal of common bream Abramis brama between reservoir its tributary using radio tags with sensors during 5-year period. Upstream species into were not motivated seeking different from those reservoir, is, body both environments comparable across seasons. However, long-distance migrations, increasing did support migrations. Temperature determine direction intensity short-distance migration tributary. No significant influence was recorded according results generalised additive mixed model (GAMM1), which movement distance as explanatory variable signed response. The second (GAMM2) relating response obtained value 19.1°C 1.5°C bream.