Heavy metal pollution of aquatic ecosystems is worldwide problem with consequences on the aquatic organisms. The concentrations of selected heavy metals (Fe, Mn, Zn, Cu, Cd and Pb) were determined in liver, kidney, gills, muscle and bone of barbel (Barbus rebeli) and chub (Squalius squalius) from the river Crn Drim in Macedonia. In general, liver and kidney in both fish species contained the highest concentration of the investigated metals, while muscle showed lowest bioaccumulation of heavy metals. Analyses supported significant seasonal differences in some organs for some metals: highest value in spring-summer compared to autumn-winter period. Generally, metal concentration was higher in the barbel than chub. The concentration of metals in muscle are bellow permissible value and do not constitute any threat for human health due to the consumption of metal loaded fish.
During several botanical expeditions in the Republic of Serbia (Mts Šar-Planina and Mts Homoljske Planine), two species of the genus Viola (V. sect. Viola) were found as new for the flora of Serbia: Viola chelmea Boiss. & Heldr. in Mt. Ošljak and V. jooi Janka in Mt. Vukan. The last taxon represents a new species also for the flora of the Balkan Peninsula. The taxonomic positions, phytogeographic importance and conservation statuses of the two new plants is discussed within the scope of their newly established distribution patterns both in the Carpathians and the Balkan Peninsula.
On the basis of morphometric and karyological analysis, a new taxonomic treatment of the endemic orophytes Viola aetolica and V. elegantula is presented and two new species, V. pseudaetolica and V. kopaonikensis from the central part of the Balkan Peninsula, are described. The Balkan endemic V. pseudaetolica differs from the similar Southern Balkan endemic V. aetolica by its rather large bright yellow flowers, conspicuously denticulate and pubescent sepals and longer spur; it also shares some features with V. elegantula and V. kopaonikensis. V. kopaonikensis is a Serbian endemic plant, morphologically well separated from the closest Balkan endemic species V. elegantula by denser indumentum, relatively longer middle leaves, smaller and strictly yellow petals and relatively shorter spur. The differences among these four species are particularly pronounced when considering the ratios between petals and sepals, petals length/width and spurs length/width. Ecology, distribution and nomenclature of these two new species are also presented and discussed.
During two botanical expeditions in the Republic of Macedonia in 2017 (Mts Šar Planina and Mt. Jakupica), two plants were found that are new for the flora of this country: Campanula wanneri Rochel in Mt. Jakupica and Carduus ramosissimus Pančić in Mts Šar Planina. The plant species habitats and phytogeographic importance of these new findings were discussed within the scope of their newly established distribution patterns in the Balkan Peninsula.
This study provides data on landscape diversity in North Macedonia. Total of 41 landscape types have been identified, on a higher hierarchical level organised within 8 landscape groups. The character of natural landscapes is provided by relief, climate, geology, soils and vegetation cover set along elevation gradient. The character of cultural landscapes is withal provided by land use and settlement patterns with reference to landscape cultural specifics and historicity. Research outputs provide an opportunity to further address the importance of spatial configuration for ecological processes and hopes to serve as a methodological and conceptual guideline for succeeding national landscape classifications in the region.
Crn Drim river is the single major outflow of the outstanding Ohrid lake. Surprisingly, data on the presence of heavy metals in waters and sediments for the whole Ohrid watershed are very scarce.This study presents the data on the concentration of heavy metals Fe, Mn, Zn, Cu, Cd and Pb in both waters and sediments collected along the river Crn Drim (including Globochica reservoir), from seven sampling sites in the Republic of North Macedonia.The concentrations of analyzed heavy metals show good water quality. As far as sediments are concerned the concentrations of heavy metals are low, with the exception of sampling points at the inflows of rivers Labunishka and Vevchanska. Seasonal dynamics of heavy metals' concentration in waters was also analyzed. Most of the heavy metals showed the lowest concentration in the spring period due to the high water levels. The annual dynamics of Fe and Mn was an exception from this pattern which might be a result of mining activities in the Ohrid Lake watershed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.