o:1814 Efekat višestrukih stresora na multitrofički biodiverzitet barskih ekosistema Effects of multiple-stressors on multitrophic biodiversity of pond ecosystems: doctoral dissertation : doctoral dissertation sr This study deals with the effects of multiple anthropogenic activities(i.e. stressors) on the richness and abundance of phytoplankton,macrophytes, zooplankton, benthic and epiphytic macroinvertebrates,and fishes, and their trophic groups. Multiple anthropogenic stressorswere integrated in one measure by calculating anthropogenic stressindex. The aim was to compare the responses of different pondcommunities to anthropogenic impact, disentangle the potentialmechanisms responsible for variations in pond biodiversity (direct,water-chemistry mediated, and cascading effects), and to quantifypond net-community response to anthropogenic impact. In addition,the importance of pond natural variability on the variations ofbiodiversity of pond hydrobiocenoses was analysed.All communities were sampled in September 2016, from the 18 studysites distributed across the six permanent ponds that differ in origin,connectedness, the intensity of a river impact, and the level of pondcoverage in surrounding area.The effects of anthropogenic stressors varied across the distinct pondcommunities, from negative effects on the richness and abundance ofmacrophytes and on the richness of epiphytic macroinvertebrates, vianeutral effects on benthic macroinvertebrates, to positive effects onfish abundance through predominance of the invasive species. Thenatural pond variability affected the pond communities and waterchemistry in the majority of cases and it is expected to alter theeffects of anthropogenic stressors on pond communities.The underlying mechanisms of anthropogenic stressors clearlydiffered among different trophic levels. Direct effects were mainlydetected witihin primary producers, while the consumers were mainlyaffected indirectly: the increase of nutrient concentrations in wateraffected abundance and richness of invertebrate trophic groups, whilecascading effects were the most influential drivers of multitrophicdiversity in the fish community. Despite the variable responses ofdifferent communities and their trophic groups, the total netcommunityeffect of the anthropogenic stressors was negative. Biobibliografija: str. 181-184,Bibliografija: str. 139-178. Datum odbrane: 11.03.2022. Hydrobiology 91552100 61213449 91552101 8546 2022-11-30T08:45:50.053Z 45 no 46 Olivera, 1989- Stamenković 82511369 2021 63 mentor Milica, 1983- Stojković-Piperac 26333799 2021 63 član komisije Đurađ, 1983- Milošević 14138471 2021 63 član komisije Vladica, 1964- Simić 9122919 2021 63 član komisije Dušanka, 1983- Cvijanović 23900519 2021 187 стр. 4010650 http://phaidrani.ni.ac.rs/o:1814 no yes 12 2022-11-30T08:45:50.320Z 70 Antropogene aktivnosti, prirodna varijabilnost,fitoplankton, makrofite, zooplankton, bentosnemakroinvertebrate, epifitske makroinvertebrate, ribe,kaskadni efekti, hemizam vode Anthropogenic activities, natural variability, phytoplankton,macrophytes, zooplankton, benthic macroinvertebrates, epiphyticmacroinvertebrates, fishes, cascading effects, water chemistry 574/575:[574.5=556.58 B 003; B260 1738 18A07 18A0704 2021