The authors researched changes in specific habitat types in areas considered to be the most important in Croatia for protection of endangered bird fauna during the period 1990-2000. The analysis focused on four areas in the continental part of Croatia (Danube and Drava River alluvium, Pokupsko depression, Sava River basin, Upper Drava River basin) and four areas in the Mediterranean part (Neretva River estuary, NW part of North Dalmatia, Paško field, Lake Vrana). For the classified habitat types, changes in Corine land cover databases in 1990 and 2000 were analysed. The greatest changes in habitat were detected along the Danube and Drava River alluvium, where more than 8% of the total area changed habitat type, as well along the Sava River basin, where approximately 5% of the total area and the greatest absolute area changed habitat type. The most pronounced changes were detected in forest habitats, where forest degradation prevents the maturation of forest stands. The authors discuss which bird species listed in the Red Data Book of Birds of Croatia may be most impacted by the detected changes in habitat. Special attention was given to a comparison of habitat changes in the Nature Park Lonjsko polje between two raptor species, Aquila pomarina and Haliaeetus albicilla, according to the suitability of habitats where changes occurred.
A mathematical model is constructed to relate the geochemical composition of recent stream material in a number of catchments on Medvednica Mt. to a broadely defined bedrock lithology which represents the parent material for the former. It is a system based factor model, which synthesizes eight lithological and 25 geochemical variables (major, minor and trace elements), reducing their relationships to six geologically meaningful factors. Five of these divulged a definite relationship between geochemistry and lithology. These are labelled as follows: factor of metamorphic rocks; factor of igneous rocks; factor of Tertiary carbonate rocks; factor of parametamorphic rocks and factor of Mesozoic carbonate rocks. Two lithologies; the Mesozoic clastic rocks and Quaternary sediments showed no clear association to any of the factors. Alternatively, one of the factors (F2) can be identified as “non-lithologic” indicating other, perhaps anthropogenic, contributions to the stream sediment geochemical composition.
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