TY  - JOUR
AU  - Novković, Maja
AU  - Cvijanović, Dušanka
AU  - Minučer, Mesaroš
AU  - Pavić, Dragoslav
AU  - Drešković, Nusret
AU  - Milošević, Đurađ
AU  - Anđelković, Ana
AU  - Damnjanović, Bojan
AU  - Radulović, Snežana
PY  - 2023
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/1151
AB  - UAV technologies provide a time- and cost-efficient framework for a variety of environmental monitoring domains. It also increases data resolution and provides new insights into observed objects and phenomena, especially within the difficult-to-access and complex for monitoring aquatic habitats. The objective of this study was to develop UAV-based acquisition and GIS-based image processing guidelines for aquatic macrophyte detection and monitoring in large temperate rivers. According to the European standard CEN EN -14184:2014, the assessment of aquatic macrophytes should be performed using the transect approach. Large rivers, such as the Danube, represent an exception and should be evaluated using 1km transects. Therefore, seven transects of the Middle Danube in Serbia were simultaneously surveyed using traditional field methods and novel UAV technology. UAV images were acquired using RGB and multispectral cameras carried by a fixed-wing drone. The images were processed and orthomosaics were classified using Object Based Image Analysis (OBIA), to create digital GIS maps of the river transects. During the traditional monitoring approach, the relative abundance of 22 macrophyte species was recorded along the transects. Using the UAV technology and OBIA approach eight macrophyte classes were distinguished based on dominant macrophyte taxa or plant life form traits. Aquatic macrophytes were 'almost perfectly' distinguished from the orthomosaics, achieving a high classification accuracy of 96 % / 88 % / 0.84 for RGB and 94 % / 97 % / 0.95 Producers /Users accuracy/Kappa index for the multispectral approach. Individual macrophyte classes accuracy varied between 0.5 and 1 Kappa and were generally higher for the multispectral imagery approach. Although the resolution of the taxonomic data is lower, UAV monitoring provided the necessary spatial context of macrophytes distribution and absolute area occupied by macrophytes. It also provided information on the diversity and distribution of habitats along the river. Therefore, the UAV-assisted monitoring approach described in this study can be effectively integrated into macrophyte monitoring during large river expeditions such as the JDS.
PB  - Carpathian Association of Environment and Earth Sciences
T2  - Carpathian Journal of Earth and Environmental Sciences
T1  - Towards UAV Assisted Monitoring Of An Aquatic Vegetation Within The Large Rivers – The Middle Danube
EP  - 322
IS  - 2
SP  - 307
VL  - 18
DO  - 10.26471/cjees/2023/018/261
ER  - 

@article{
author = "Novković, Maja and Cvijanović, Dušanka and Minučer, Mesaroš and Pavić, Dragoslav and Drešković, Nusret and Milošević, Đurađ and Anđelković, Ana and Damnjanović, Bojan and Radulović, Snežana",
year = "2023",
abstract = "UAV technologies provide a time- and cost-efficient framework for a variety of environmental monitoring domains. It also increases data resolution and provides new insights into observed objects and phenomena, especially within the difficult-to-access and complex for monitoring aquatic habitats. The objective of this study was to develop UAV-based acquisition and GIS-based image processing guidelines for aquatic macrophyte detection and monitoring in large temperate rivers. According to the European standard CEN EN -14184:2014, the assessment of aquatic macrophytes should be performed using the transect approach. Large rivers, such as the Danube, represent an exception and should be evaluated using 1km transects. Therefore, seven transects of the Middle Danube in Serbia were simultaneously surveyed using traditional field methods and novel UAV technology. UAV images were acquired using RGB and multispectral cameras carried by a fixed-wing drone. The images were processed and orthomosaics were classified using Object Based Image Analysis (OBIA), to create digital GIS maps of the river transects. During the traditional monitoring approach, the relative abundance of 22 macrophyte species was recorded along the transects. Using the UAV technology and OBIA approach eight macrophyte classes were distinguished based on dominant macrophyte taxa or plant life form traits. Aquatic macrophytes were 'almost perfectly' distinguished from the orthomosaics, achieving a high classification accuracy of 96 % / 88 % / 0.84 for RGB and 94 % / 97 % / 0.95 Producers /Users accuracy/Kappa index for the multispectral approach. Individual macrophyte classes accuracy varied between 0.5 and 1 Kappa and were generally higher for the multispectral imagery approach. Although the resolution of the taxonomic data is lower, UAV monitoring provided the necessary spatial context of macrophytes distribution and absolute area occupied by macrophytes. It also provided information on the diversity and distribution of habitats along the river. Therefore, the UAV-assisted monitoring approach described in this study can be effectively integrated into macrophyte monitoring during large river expeditions such as the JDS.",
publisher = "Carpathian Association of Environment and Earth Sciences",
journal = "Carpathian Journal of Earth and Environmental Sciences",
title = "Towards UAV Assisted Monitoring Of An Aquatic Vegetation Within The Large Rivers – The Middle Danube",
pages = "322-307",
number = "2",
volume = "18",
doi = "10.26471/cjees/2023/018/261"
}

Novković, M., Cvijanović, D., Minučer, M., Pavić, D., Drešković, N., Milošević, Đ., Anđelković, A., Damnjanović, B.,& Radulović, S.. (2023). Towards UAV Assisted Monitoring Of An Aquatic Vegetation Within The Large Rivers – The Middle Danube. in Carpathian Journal of Earth and Environmental Sciences
Carpathian Association of Environment and Earth Sciences., 18(2), 307-322.
https://doi.org/10.26471/cjees/2023/018/261

Novković M, Cvijanović D, Minučer M, Pavić D, Drešković N, Milošević Đ, Anđelković A, Damnjanović B, Radulović S. Towards UAV Assisted Monitoring Of An Aquatic Vegetation Within The Large Rivers – The Middle Danube. in Carpathian Journal of Earth and Environmental Sciences. 2023;18(2):307-322.
doi:10.26471/cjees/2023/018/261 .

Novković, Maja, Cvijanović, Dušanka, Minučer, Mesaroš, Pavić, Dragoslav, Drešković, Nusret, Milošević, Đurađ, Anđelković, Ana, Damnjanović, Bojan, Radulović, Snežana, "Towards UAV Assisted Monitoring Of An Aquatic Vegetation Within The Large Rivers – The Middle Danube" in Carpathian Journal of Earth and Environmental Sciences, 18, no. 2 (2023):307-322,
https://doi.org/10.26471/cjees/2023/018/261 . .

TY  - JOUR
AU  - Anđelković, Ana
AU  - Popović, Slađana
AU  - Živković, Milica
AU  - Cvijanović, Dušanka
AU  - Novković, Maja
AU  - Marisavljević, Dragana
AU  - Pavlovic, Danijela
AU  - Radulović, Snežana
PY  - 2022
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/618
AB  - Portulaca oleracea L. is one of the most widely distributed plant species, invading a host of worldwide regions. Rivers and canals, as
corridors connecting neighboring habitats, are known to exhibit high invasion levels. Consequently, the aim of this paper was to show
which catchment areas, environmental factors and habitat types can be seen as predictors of the presence of this invasive species in the
riparian areas of Serbia. Field research was carried out at 250 field sites, where the cover and abundance of P. oleracea, relevant
environmental variables and habitat type were recorded. Redundancy analysis (RDA) and response curves fitted using a generalized
linear model (GLM) were used to show the relation of the cover of P. oleracea and the following variables: catchment area, predominant
bank material, elevation, and the total number of invasive species on site. A non-metric multidimensional scaling (NMDS) was used to
group sites where P. oleracea was found, based on the values of its cover. In general, primarily the rivers in the northern, low-lying part of
Serbia can be seen as important corridors of the spread of P. oleracea. Its dominance is especially associated with areas draining into the
Danube and Sava rivers and field sites characterized by a high pressure of invasive plants. Of the total number of records, the highest
number of invaded field sites was recorded along the Danube, Tisa and Zapadna Morava rivers. Regarding the environmental and habitat
predictors, the results have shown that the abundance of P. oleracea is associated with gravelly and sandy banks and grassland habitat
types, primarily anthropogenic herb stands.
PB  - Univerzitet u Kragujevcu - Agronomski fakultet, Čačak
T2  - Acta Agriculturae Serbica
T1  - Catchment area, environmental variables and habitat type as predictors of the distribution and abundance of Portulaca oleracea L. in the riparian areas of Serbia
EP  - 15
IS  - 53
SP  - 9
VL  - 27
DO  - 10.5937/AASer2253009A
ER  - 

@article{
author = "Anđelković, Ana and Popović, Slađana and Živković, Milica and Cvijanović, Dušanka and Novković, Maja and Marisavljević, Dragana and Pavlovic, Danijela and Radulović, Snežana",
year = "2022",
abstract = "Portulaca oleracea L. is one of the most widely distributed plant species, invading a host of worldwide regions. Rivers and canals, as
corridors connecting neighboring habitats, are known to exhibit high invasion levels. Consequently, the aim of this paper was to show
which catchment areas, environmental factors and habitat types can be seen as predictors of the presence of this invasive species in the
riparian areas of Serbia. Field research was carried out at 250 field sites, where the cover and abundance of P. oleracea, relevant
environmental variables and habitat type were recorded. Redundancy analysis (RDA) and response curves fitted using a generalized
linear model (GLM) were used to show the relation of the cover of P. oleracea and the following variables: catchment area, predominant
bank material, elevation, and the total number of invasive species on site. A non-metric multidimensional scaling (NMDS) was used to
group sites where P. oleracea was found, based on the values of its cover. In general, primarily the rivers in the northern, low-lying part of
Serbia can be seen as important corridors of the spread of P. oleracea. Its dominance is especially associated with areas draining into the
Danube and Sava rivers and field sites characterized by a high pressure of invasive plants. Of the total number of records, the highest
number of invaded field sites was recorded along the Danube, Tisa and Zapadna Morava rivers. Regarding the environmental and habitat
predictors, the results have shown that the abundance of P. oleracea is associated with gravelly and sandy banks and grassland habitat
types, primarily anthropogenic herb stands.",
publisher = "Univerzitet u Kragujevcu - Agronomski fakultet, Čačak",
journal = "Acta Agriculturae Serbica",
title = "Catchment area, environmental variables and habitat type as predictors of the distribution and abundance of Portulaca oleracea L. in the riparian areas of Serbia",
pages = "15-9",
number = "53",
volume = "27",
doi = "10.5937/AASer2253009A"
}

Anđelković, A., Popović, S., Živković, M., Cvijanović, D., Novković, M., Marisavljević, D., Pavlovic, D.,& Radulović, S.. (2022). Catchment area, environmental variables and habitat type as predictors of the distribution and abundance of Portulaca oleracea L. in the riparian areas of Serbia. in Acta Agriculturae Serbica
Univerzitet u Kragujevcu - Agronomski fakultet, Čačak., 27(53), 9-15.
https://doi.org/10.5937/AASer2253009A

Anđelković A, Popović S, Živković M, Cvijanović D, Novković M, Marisavljević D, Pavlovic D, Radulović S. Catchment area, environmental variables and habitat type as predictors of the distribution and abundance of Portulaca oleracea L. in the riparian areas of Serbia. in Acta Agriculturae Serbica. 2022;27(53):9-15.
doi:10.5937/AASer2253009A .

Anđelković, Ana, Popović, Slađana, Živković, Milica, Cvijanović, Dušanka, Novković, Maja, Marisavljević, Dragana, Pavlovic, Danijela, Radulović, Snežana, "Catchment area, environmental variables and habitat type as predictors of the distribution and abundance of Portulaca oleracea L. in the riparian areas of Serbia" in Acta Agriculturae Serbica, 27, no. 53 (2022):9-15,
https://doi.org/10.5937/AASer2253009A . .

TY  - JOUR
AU  - Živković, Milica
AU  - Anđelković, Ana
AU  - Cvijanović, Dušanka
AU  - Novković, Maja
AU  - Vukov, Dragana
AU  - Šipoš, Šandor
AU  - Ilić, Miloš
AU  - Pankov, Nemanja
AU  - Miljanović, Branko
AU  - Marisavljević, Dragana
AU  - Pavlovic, D.
AU  - Radulović, Snežana
PY  - 2019
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/863
AB  - Pistia stratiotes L. (water lettuce) is known as one of the most troublesome aquatic macrophytes, strongly affecting the environment and human activities in slowmoving and stagnant inland water systems. It was introduced into Europe in the 20th century and has since spread to 15 European countries. This paper presents data on the first record of this invasive aquatic plant in natural inland waters of Vojvodina (northern lowland part of Serbia) and discusses the possible pathways of its introduction. Field research was conducted in October and November 2017 on the Begej River in Vojvodina Province (Serbia), where populations of P. stratiotes were documented for the first time near Srpski Itebej, in close proximity (1.2 km downstream) of the Romanian border. The plant samples were collected, photographed in situ and deposited in the BUNS Herbarium. The relevant environmental data were also recorded in situ and water samples were collected for chemical analysis. This new record presents the first documented case of this invasive alien in rivers in Serbia, and expands upon the previous findings of this species in natural thermal waters of south-eastern and eastern Serbia. Taking into account the distance from the Romanian border and the fact that it has already been present in this country for several years, this introduction could be attributed to the spontaneous spreading of P. stratiotes from this neighbouring country. Nevertheless, despite this possibility, discarded aquarium plants cannot be entirely discounted as a potential source of this new introduction. Although it is hard to predict the exact consequences of this new introduction at such an early stage, bearing in mind the detrimental impacts P. stratiotes can have on the environment and excellent lateral connectivity of the Begej River with the canal and river network of Serbia, this finding highlights the need to take urgent action to control and instate regular monitoring measures, especially on the rivers and canals located close to the state borders.
PB  - InvasivesNet
T2  - BioInvasions Records
T1  - The begginings of Pistia stratiotes (Linnaeus, 1753) invasion in the lower Danube delta: The first record for the Province of Vojvodina (Serbia)
EP  - 229
IS  - 2
SP  - 218
VL  - 8
DO  - 10.3391/bir.2019.8.2.03
ER  - 

@article{
author = "Živković, Milica and Anđelković, Ana and Cvijanović, Dušanka and Novković, Maja and Vukov, Dragana and Šipoš, Šandor and Ilić, Miloš and Pankov, Nemanja and Miljanović, Branko and Marisavljević, Dragana and Pavlovic, D. and Radulović, Snežana",
year = "2019",
abstract = "Pistia stratiotes L. (water lettuce) is known as one of the most troublesome aquatic macrophytes, strongly affecting the environment and human activities in slowmoving and stagnant inland water systems. It was introduced into Europe in the 20th century and has since spread to 15 European countries. This paper presents data on the first record of this invasive aquatic plant in natural inland waters of Vojvodina (northern lowland part of Serbia) and discusses the possible pathways of its introduction. Field research was conducted in October and November 2017 on the Begej River in Vojvodina Province (Serbia), where populations of P. stratiotes were documented for the first time near Srpski Itebej, in close proximity (1.2 km downstream) of the Romanian border. The plant samples were collected, photographed in situ and deposited in the BUNS Herbarium. The relevant environmental data were also recorded in situ and water samples were collected for chemical analysis. This new record presents the first documented case of this invasive alien in rivers in Serbia, and expands upon the previous findings of this species in natural thermal waters of south-eastern and eastern Serbia. Taking into account the distance from the Romanian border and the fact that it has already been present in this country for several years, this introduction could be attributed to the spontaneous spreading of P. stratiotes from this neighbouring country. Nevertheless, despite this possibility, discarded aquarium plants cannot be entirely discounted as a potential source of this new introduction. Although it is hard to predict the exact consequences of this new introduction at such an early stage, bearing in mind the detrimental impacts P. stratiotes can have on the environment and excellent lateral connectivity of the Begej River with the canal and river network of Serbia, this finding highlights the need to take urgent action to control and instate regular monitoring measures, especially on the rivers and canals located close to the state borders.",
publisher = "InvasivesNet",
journal = "BioInvasions Records",
title = "The begginings of Pistia stratiotes (Linnaeus, 1753) invasion in the lower Danube delta: The first record for the Province of Vojvodina (Serbia)",
pages = "229-218",
number = "2",
volume = "8",
doi = "10.3391/bir.2019.8.2.03"
}

Živković, M., Anđelković, A., Cvijanović, D., Novković, M., Vukov, D., Šipoš, Š., Ilić, M., Pankov, N., Miljanović, B., Marisavljević, D., Pavlovic, D.,& Radulović, S.. (2019). The begginings of Pistia stratiotes (Linnaeus, 1753) invasion in the lower Danube delta: The first record for the Province of Vojvodina (Serbia). in BioInvasions Records
InvasivesNet., 8(2), 218-229.
https://doi.org/10.3391/bir.2019.8.2.03

Živković M, Anđelković A, Cvijanović D, Novković M, Vukov D, Šipoš Š, Ilić M, Pankov N, Miljanović B, Marisavljević D, Pavlovic D, Radulović S. The begginings of Pistia stratiotes (Linnaeus, 1753) invasion in the lower Danube delta: The first record for the Province of Vojvodina (Serbia). in BioInvasions Records. 2019;8(2):218-229.
doi:10.3391/bir.2019.8.2.03 .

Živković, Milica, Anđelković, Ana, Cvijanović, Dušanka, Novković, Maja, Vukov, Dragana, Šipoš, Šandor, Ilić, Miloš, Pankov, Nemanja, Miljanović, Branko, Marisavljević, Dragana, Pavlovic, D., Radulović, Snežana, "The begginings of Pistia stratiotes (Linnaeus, 1753) invasion in the lower Danube delta: The first record for the Province of Vojvodina (Serbia)" in BioInvasions Records, 8, no. 2 (2019):218-229,
https://doi.org/10.3391/bir.2019.8.2.03 . .

TY  - JOUR
AU  - Cvijanović, Dušanka
AU  - Živković, Milica
AU  - Anđelković, Ana
AU  - Novković, Maja
AU  - Radulović, Snežana
AU  - Lakušić, Dmitar
PY  - 2016
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/1048
AB  - Despite the absence of a centralized national phytocoenological database of Serbia, over 16,000 relevés of all vegetation types have been gathered and stored in the database “Phytocoenosis of Serbia” as a result of the Project “Habitats of Serbia”. However, as the data on aquatic and semiaquatic vegetation comprise only 5% of the collected relevés, the aim of this paper is to expand on this, complete the database and present the data on these vegetation types in Serbia. The work included the expansion of the existing database with the addition of relevant sources, their digitalization, using Flora and Turboveg programs, and their subsequent georeferencing, using OziExplorer and DIVAGIS softwares. Consequently, the phytocoenological database on aquatic and semiaquatic vegetation in Serbia now stores 1,720 relevés from 243 phytocoenological tables, collected and published by 24 authors during the period of 70 years (1940–2010), with the majority of the relevés collected over the last decade (56.40%). Phragmito-Magno-Caricetea Klika in Klika et Novák 1941 (Syn: Phragmitetea communis R. Tx. et Prsg. 1942), Potametea Klika in Klika et Novák 1941 (Syn: Potametea R. Tx. et Preising 1942) and Lemnetea de Bolós et Masclans 1955 (Syn: Lemnetea minoris W. Koch et R. Tx. 1955) have proven to be the most represented classes, while Scirpo-Phragmitetum W. Koch 1926 (nomen ambiguum) and Salvinio natantis-Spirodeletum polyrrhizae Slavnić 1956 are associations with the highest number of relevés in the database. Accordingly, the most common species (>500 relevés) are Ceratophyllum demersum L. subsp. demersum, Lemna minor L. and Spirodela polyrhiza (L.) Schleiden.
PB  - Matica Srpska
T2  - Zbornik Matice srpske za prirodne nauke
T1  - The digital database of aquatic and semiaquatic vegetation in Serbia
EP  - 155
IS  - 2
SP  - 145
VL  - 131
ER  - 

@article{
author = "Cvijanović, Dušanka and Živković, Milica and Anđelković, Ana and Novković, Maja and Radulović, Snežana and Lakušić, Dmitar",
year = "2016",
abstract = "Despite the absence of a centralized national phytocoenological database of Serbia, over 16,000 relevés of all vegetation types have been gathered and stored in the database “Phytocoenosis of Serbia” as a result of the Project “Habitats of Serbia”. However, as the data on aquatic and semiaquatic vegetation comprise only 5% of the collected relevés, the aim of this paper is to expand on this, complete the database and present the data on these vegetation types in Serbia. The work included the expansion of the existing database with the addition of relevant sources, their digitalization, using Flora and Turboveg programs, and their subsequent georeferencing, using OziExplorer and DIVAGIS softwares. Consequently, the phytocoenological database on aquatic and semiaquatic vegetation in Serbia now stores 1,720 relevés from 243 phytocoenological tables, collected and published by 24 authors during the period of 70 years (1940–2010), with the majority of the relevés collected over the last decade (56.40%). Phragmito-Magno-Caricetea Klika in Klika et Novák 1941 (Syn: Phragmitetea communis R. Tx. et Prsg. 1942), Potametea Klika in Klika et Novák 1941 (Syn: Potametea R. Tx. et Preising 1942) and Lemnetea de Bolós et Masclans 1955 (Syn: Lemnetea minoris W. Koch et R. Tx. 1955) have proven to be the most represented classes, while Scirpo-Phragmitetum W. Koch 1926 (nomen ambiguum) and Salvinio natantis-Spirodeletum polyrrhizae Slavnić 1956 are associations with the highest number of relevés in the database. Accordingly, the most common species (>500 relevés) are Ceratophyllum demersum L. subsp. demersum, Lemna minor L. and Spirodela polyrhiza (L.) Schleiden.",
publisher = "Matica Srpska",
journal = "Zbornik Matice srpske za prirodne nauke",
title = "The digital database of aquatic and semiaquatic vegetation in Serbia",
pages = "155-145",
number = "2",
volume = "131"
}

Cvijanović, D., Živković, M., Anđelković, A., Novković, M., Radulović, S.,& Lakušić, D.. (2016). The digital database of aquatic and semiaquatic vegetation in Serbia. in Zbornik Matice srpske za prirodne nauke
Matica Srpska., 131(2), 145-155.

Cvijanović D, Živković M, Anđelković A, Novković M, Radulović S, Lakušić D. The digital database of aquatic and semiaquatic vegetation in Serbia. in Zbornik Matice srpske za prirodne nauke. 2016;131(2):145-155..

Cvijanović, Dušanka, Živković, Milica, Anđelković, Ana, Novković, Maja, Radulović, Snežana, Lakušić, Dmitar, "The digital database of aquatic and semiaquatic vegetation in Serbia" in Zbornik Matice srpske za prirodne nauke, 131, no. 2 (2016):145-155.