The study was conducted to evaluate treatment performance, fish production, crop plant biomass production, water consumption, and water use efficiency of a pilot aquaponic system for small-scale land-based cyprinid fish farms based on closed loop principle and nutrient retention from polluted water for crop growth. The treatment system reduced water consumption, algae biomass and it was efficient in mass removal of total suspended solids , biochemical oxygen demand, chemical oxygen demand, NH4-N, total nitrogen, and total phosphorous. Negative removal of NO3- N, NO2-N, and PO4-P indicated the need for the introduction of additional hydroponic beds in the system. Tomato biomass production was high. The presented aquaponic system could be useful for semi-natural fish farming with fish loads up to 2 kg/m3. This article addresses algae community including diatoms in aquaponoc systems in connection with treatment processes and nutrient uptake.
COBISS.SI-ID: 4745067
Formalized classifications synthesizing vegetation data at the continental scale are being attempted only now, although they are of key importance for nature conservation planning. Therefore, we aim to provide a vegetation classification and to describe the main biogeographical patterns of floodplain forests and alder carrs in Europe. A database of more than 40 000 vegetation plots of floodplain forests and alder carrs across Europe was compiled. The main biogeographical patterns and environmentally-related gradients in species composition were determined using detrended correspondence and cluster analysis. Twenty-nine associations of floodplain forests and alder carrs were distinguished, which belong to four alliances: Alnion incanae, Osmundo-Alnion, Populion albae and Alnion glutinosae. This study is the first applying a formalized classification at the association level for a broad vegetation type at the continental scale. The proposed classification provides the scientific basis for the necessary improvement of the habitat classification systems used in European nature conservation.
COBISS.SI-ID: 39125293
River inputs can significantly affect carbon dynamics in the costal ocean. Here, we investigate the influence of four rivers (Isonzo/Soča, Timavo/Reka, Rižana, and Dragonja) on inorganic carbon (C) in the Gulf of Trieste in the northern Adriatic Sea using stable isotope signatures of dissolved inorganic carbon (δ13CDIC). In 2007, rivers exported 1.03×1011 g C in the form of dissolved inorganic carbon (DIC) to the Gulf of Trieste with the lowest export observed in the Dragonja and the highest in the Isonzo/Soča. River plumes were associated with higher total alkalinity (TA) and pCO2 values compared with Gulf of Trieste waters, but their inputs showed high spatial variability. The δ13CDIC values and the isotopic mass balance suggested that river input during the spring of 2007 represented about 16%of DIC at our study site VIDA, located in the southeastern part of the Gulf of Trieste. During autumn of 2007, the riverine contribution of DIC was less pronounced (3 %) although the river export of C was higher relative to the spring season. Convective mixing with the Gulf of Trieste waters and bora wind events appear to reduce the riverine contribution to the DIC system. Our results suggest that river plumes play an important role in C cycling in the Gulf of Trieste by direct inputs of higher riverine DIC and by increased biological uptake of DIC promoted by the supply of riverine nutrients.
COBISS.SI-ID: 27642407