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Velevski M.,Macedonian Ecological Society | Grubac B.,Institute for Nature Conservation of Serbia | Tomovic L.,University of Belgrade
Acta Zoologica Bulgarica | Year: 2014

We used VORTEX 9.99 to ran 21 simulations on the viability of the population of the Egyptian Vulture Neophron percnopterus in Macedonia. Our baseline scenario indicated that there is a high probability of total extinction of the Egyptian Vulture from Macedonia within 50 years, with mean and median time periods to first extinctions being 26 and 25 years, respectively. Productivity rates have little influence on the persistence of the population, and conservation actions should be focused on reduction in the mortality rate not only in the breeding regions but also along the migration routes and in the wintering quarters. The possible supplementation of population would be justified only if the programme is accomplished together with some in-situ conservation measures. The number of the released juveniles in such a programme will have a clear effect on the viability of the population. Further research is urgently needed in order to identify the migration routes and wintering areas of the birds that breed or fledge in Macedonia, as well as to determine the actual mortality rates among the different age classes, since our results have indicated that the numbers used in this study may be considered too optimistic. Great care in planning of the future infra-structural and touristic development of the country and more efforts to control the illegal use of poison are also needed in order to protect the Egyptian Vulture from extinction in Macedonia. Currently, the species should be considered as Critically Endangered at national level. Source

Simic S.,Institute for Nature Conservation of Serbia | Milovanovic B.,Serbian Academy of Science and Arts | Glavonjic T.J.,Serbian Academy of Science and Arts
Carpathian Journal of Earth and Environmental Sciences | Year: 2014

The concept of geoheritage in general and hydrological heritage as its segment is reflected in representative examples of geodiversity - geoheritage sites. Accordingly, the issue of the identification of such extraordinary parts of the geographic mantle is one of the most important problems in this complex area of study. Assuming the universal value of water and water phenomena that result from specific characteristics, this study seeks to present and explain a theoretical pathway from an investigated water phenomenon to a concrete hydrological heritage site by stressing the importance of establishing the appropriate evaluation criteria; this pathway is necessary in order to reply the fundamental question: whether and why the observed water phenomenon does (or does not) merit the status of a hydrological heritage site. The research has resulted in universal theoretical model for the identification of hydrological heritage, which has a practical significance not only in this field, but in the identification of other types of geoheritage as well. Source

Lazarevic M.,University of Belgrade | Siljak-Yakovlev S.,CNRS Ecology, Systematic and Evolution Laboratory | Lazarevic P.,Institute for Nature Conservation of Serbia | Stevanovic B.,University of Belgrade | Stevanovic V.,University of Belgrade
Turkish Journal of Botany | Year: 2013

The pollen and seeds of 3 paleoendemic resurrection species, Ramonda myconi (L.) Rchb. (Iberian Peninsula), R. nathaliae Pančić & Petrović, and R. serbica Pančić (Balkan Peninsula), as well as of natural hybrids between the 2 last species, have been analyzed using light and scanning electron microscopy. Their general structural differences, taxonomic and phylogenetic significance, pollen viability, and seed germination capacity, as well as the correlation of pollen and seed characteristics and plant ploidy levels, have been studied. The pollen grains are small (R. myconi, R. nathaliae) to medium (R. serbica) in size, ranging from 10 to 28 μm, and 3-colporate, isopolar monads with microreticulate-perforate exine. Seeds are small, 309 to 1000 μm long and 80 to 425 μm wide, elongated, with a reticulate surface and auriculate ornamentation. Micromorphologies of the pollen exine ornamentation and seed surface revealed significant differences among the 3 species. Pollen from hybrid individuals was heterogeneous in size and morphology, and the germination of their tiny seeds was very low. A strong correlation was found between pollen size, DNA content, and chromosome number. The environmental influence on pollen and seeds of 3 species and especially of the R. nathaliae population growing on serpentine is also discussed. © TÜBITAK. Source

Sava S.,Institute for Nature Conservation of Serbia | Bojan G.,University of Belgrade | Nenad Z.,University of Belgrade | Ljiljana G.,University of Belgrade
Geographica Pannonica | Year: 2012

Protection of hydrological heritage sites, water protection segment, is an integral part of nature conservation. Today it is the basic theme of the hydrological heritage, the new field of hydrology and geoheritage, which, by exploring and evaluating hydrological diversity of a particular area and identifying representative water phenomena, sets their preservation and protection as one of the utmost objectives. Two main problems in the protection of water phenomena in Serbia are: inadequate attitude of the individual and society, as a result of poor knowledge of the characteristics and values of waters, and the ever-present need for men to use them (as resources). Lack of understanding, in the professional sphere, the value and importance of water phenomena in the natural system, as a result of a firmly based biocentrism in nature conservation, lack of hydrologic group within the geoheritage and a small number of interested professionals are some of the associated problems that limit the activities in this field. Specific problems, from the lack of organized and synchronized scientific research to the lack of a database on the hydrological heritage sites, are somewhat common to other segments of the nature conservation of Serbia. There are three possible directions of the future actions on the protection of hydrological heritage sites of Serbia: complete protection, protection with utilisation for the needs of tourism and protection with utilisation for the needs of water management. The most complex task of hydrological heritage will just be to combine the preservation and protection with tourism and water management, because it is diverse and often conflicting industries about. A possible solution to this problem is illustrated through the idea of water reserves. Source

Golubovic A.,University of Belgrade | Arsovski D.,Macedonian Ecological Society herpetology group | Ajtic R.,Institute for Nature Conservation of Serbia | Tomovic L.,University of Belgrade | And 2 more authors.
Biological Journal of the Linnean Society | Year: 2013

Despite exhibiting low velocity and limited agility, many tortoises undertake large scale movements and must overcome various obstacles, notably in populations living in hilly or rocky habitats. Although crucial, studies exploring how tortoises move in complex and irregular environments are scarce. In this context, we examined an important behavioural trait: how tortoises (Testudo hermanni) deal with step-like obstacles. In their natural habitat, individuals were positioned in a challenging situation: they were placed on a bench approximately 50cm high, and were observed over a 10-min period. We compared the behaviour of the tortoises (taking a risk to 'jump' or waiting) from two populations living in contrasted habitats: flat versus rugged (crisscrossed by cliffs and rocky steps). Individuals from the flat habitat were reluctant to jump, whereas most tortoises from the rugged habitat jumped. Immature tortoises were less willing to jump compared to larger and more experienced adults. These results suggest that challenging habitats increase boldness. In addition to fundamental findings, these results may have conservation value and assist in improving translocation strategies for endangered tortoise populations. © 2013 The Linnean Society of London. Source

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