Utjecaj temperaturnih ekstrema na proljetno – ljetni razvoj zajednice zooplanktona

Microcrustacean zooplankton constitutes a major component of freshwater food webs and their development depends on temperature. The aim of this study was to determine whether the recorded normal and extreme temperatures have an impact on the qualitative and quantitative composition of the microcrustacean community in Lake Sakadas (Kopacki rit Nature Park) during spring (April – June) and summer (July – September) of 2012., 2013. and in 2016. Water samples for hydrobiological analyses were collected monthly from the upper layer of Lake Sakadas. The structure of the zooplankton community was described using indexes and the values of the measured physico – chemical parameters were compared using a statistical application of the t-test and one – way ANOVA. Small forms dominated in the cladoceran community, while cyclopoid copepods with juvenile forms were dominant in the copepod community. The abundance and biomass were significantly different between spring and summer with higher numbers recorded in spring. The present study found an impact of temperature on seasonal succession and contribution to interannual variability in community structure and an indirect impact through nutrient availability and predation. Simultaneously with the temperature, transparency, chlorophyll – a concentration and nitrogen concentration influenced the microcrustacean zooplankton community.