TY  - CONF
AU  - Savić, Aleksandra
AU  - Oveisi, Mostafa
AU  - Müller Schärer, H.
AU  - Vrbničanin, Sava
PY  - 2024
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/1289
AB  - Ambrosia artemisiifolia (AMBEL) and Ambrosia trifida (AMBTR) are recognized as troublesome invasive plant species in several regions of the world, including Europe. Under their impact, crop production is reduced in the invaded areas, and a large amount of pollen produced is harmful to human health. The height and density of these species can produce strong shading effects and inhibit the growth of other species, which is a precondition significantly changing the biodiversity and structure of the invaded ecosystems. Unlike AMBEL, which is widespread in many parts of Serbia, AMBTR is currently naturalized only in the area of central Bačka. Their harmful impact has also been noted in this area. Given all the above, the aim of this research was focused on examining the interaction of two ragweed species and their impact on other species in the plant community. During 2016 and 2017, field experiments were carried out at a farm near Dobrić, Republic of Serbia (44°41′N, 19°34′E). Unlike AMBEL, which forms dense populations in this area and greatly impacts crop production, AMBTR has not yet been recorded in this part of Serbia. Seeds of AMBTR were collected in autumn 2015 from infested crop fields in Central Bačka (45°30′N, 19°31′E). The experiment was set up as a replacement series design (four replicates) in different AMBEL/AMBTR ratios per m2: 10/0; 8/2; 6/4; 4/6; 2/8; 0/10. In addition to maintaining the total number of ragweed/m2, other weed species were not removed. They were more or less homogeneously distributed, with the most abundant species being Setaria viridis, Echinochloa crus-galli, Sorghum halepense, Polygonum aviculare, Cirsium arvense, Chenopodium album, Plantago major, and Erigeron annuus. The dry mass of plants was measured to assess interactions, and data analysis was performed in R-studio. During both seasons, ANOVA showed the same trend. With the increase in the number of AMBTR/m2 and the decrease in the number of AMBEL/m2, the dry mass of AMBTR decreased. Opposite, with the increase in the number of AMBEL and the decrease in AMBTR, the dry mass of AMBEL was increasing. According to the results, it can be concluded that interspecific competition is larger for AMBEL, in contrast, intraspecific is greater for AMBTR. During both seasons, in the treatments with the increase in the number of AMBTR and the decrease in the number of AMBEL/m2, the dry mass of other weeds decreased. Additionally, we conclude that AMBTR had a greater impact on other weeds in the plant community.
C3  - Internacional Ragweed Society Conference, 8-9 September 2024, Budapest, Hungary
T1  - S1 – O6 COMPETITIVE HIERARCHY OF TWO RAGWEED SPECIES AND ITS EFFECT ON OTHER WEEDS IN THE PLANT COMMUNITY
SP  - 30
DO  - 10.19040/ecocycles.v8i3.242
ER  - 

@conference{
author = "Savić, Aleksandra and Oveisi, Mostafa and Müller Schärer, H. and Vrbničanin, Sava",
year = "2024",
abstract = "Ambrosia artemisiifolia (AMBEL) and Ambrosia trifida (AMBTR) are recognized as troublesome invasive plant species in several regions of the world, including Europe. Under their impact, crop production is reduced in the invaded areas, and a large amount of pollen produced is harmful to human health. The height and density of these species can produce strong shading effects and inhibit the growth of other species, which is a precondition significantly changing the biodiversity and structure of the invaded ecosystems. Unlike AMBEL, which is widespread in many parts of Serbia, AMBTR is currently naturalized only in the area of central Bačka. Their harmful impact has also been noted in this area. Given all the above, the aim of this research was focused on examining the interaction of two ragweed species and their impact on other species in the plant community. During 2016 and 2017, field experiments were carried out at a farm near Dobrić, Republic of Serbia (44°41′N, 19°34′E). Unlike AMBEL, which forms dense populations in this area and greatly impacts crop production, AMBTR has not yet been recorded in this part of Serbia. Seeds of AMBTR were collected in autumn 2015 from infested crop fields in Central Bačka (45°30′N, 19°31′E). The experiment was set up as a replacement series design (four replicates) in different AMBEL/AMBTR ratios per m2: 10/0; 8/2; 6/4; 4/6; 2/8; 0/10. In addition to maintaining the total number of ragweed/m2, other weed species were not removed. They were more or less homogeneously distributed, with the most abundant species being Setaria viridis, Echinochloa crus-galli, Sorghum halepense, Polygonum aviculare, Cirsium arvense, Chenopodium album, Plantago major, and Erigeron annuus. The dry mass of plants was measured to assess interactions, and data analysis was performed in R-studio. During both seasons, ANOVA showed the same trend. With the increase in the number of AMBTR/m2 and the decrease in the number of AMBEL/m2, the dry mass of AMBTR decreased. Opposite, with the increase in the number of AMBEL and the decrease in AMBTR, the dry mass of AMBEL was increasing. According to the results, it can be concluded that interspecific competition is larger for AMBEL, in contrast, intraspecific is greater for AMBTR. During both seasons, in the treatments with the increase in the number of AMBTR and the decrease in the number of AMBEL/m2, the dry mass of other weeds decreased. Additionally, we conclude that AMBTR had a greater impact on other weeds in the plant community.",
journal = "Internacional Ragweed Society Conference, 8-9 September 2024, Budapest, Hungary",
title = "S1 – O6 COMPETITIVE HIERARCHY OF TWO RAGWEED SPECIES AND ITS EFFECT ON OTHER WEEDS IN THE PLANT COMMUNITY",
pages = "30",
doi = "10.19040/ecocycles.v8i3.242"
}

Savić, A., Oveisi, M., Müller Schärer, H.,& Vrbničanin, S.. (2024). S1 – O6 COMPETITIVE HIERARCHY OF TWO RAGWEED SPECIES AND ITS EFFECT ON OTHER WEEDS IN THE PLANT COMMUNITY. in Internacional Ragweed Society Conference, 8-9 September 2024, Budapest, Hungary, 30.
https://doi.org/10.19040/ecocycles.v8i3.242

Savić A, Oveisi M, Müller Schärer H, Vrbničanin S. S1 – O6 COMPETITIVE HIERARCHY OF TWO RAGWEED SPECIES AND ITS EFFECT ON OTHER WEEDS IN THE PLANT COMMUNITY. in Internacional Ragweed Society Conference, 8-9 September 2024, Budapest, Hungary. 2024;:30.
doi:10.19040/ecocycles.v8i3.242 .

Savić, Aleksandra, Oveisi, Mostafa, Müller Schärer, H., Vrbničanin, Sava, "S1 – O6 COMPETITIVE HIERARCHY OF TWO RAGWEED SPECIES AND ITS EFFECT ON OTHER WEEDS IN THE PLANT COMMUNITY" in Internacional Ragweed Society Conference, 8-9 September 2024, Budapest, Hungary (2024):30,
https://doi.org/10.19040/ecocycles.v8i3.242 . .

TY  - JOUR
AU  - Oveisi, Mostafa
AU  - Šikuljak, Danijela
AU  - Anđelković, Ana
AU  - Božić, Dragana
AU  - Trkulja, Nenad
AU  - Piri, Ramin
AU  - Poczai, Peter
AU  - Vrbničanin, Sava
PY  - 2024
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/1283
AB  - Background Avena fatua and A. sterilis are challenging to distinguish due to their strong similarities. However,
Artificial Neural Networks (ANN) can effectively extract patterns and identify these species. We measured seed traits
of Avena species from 122 locations across the Balkans and from some populations from southern, western, and
central Europe (total over 22 000 seeds). The inputs for the ANN model included seed mass, size, color, hairiness, and
placement of the awn attachment on the lemma.
Results The ANN model achieved high classification accuracy for A. fatua and A. sterilis (R2>0.99, RASE<0.0003) with
no misclassification. Incorporating geographic coordinates as inputs also resulted in successful classification (R2>0.99,
RASE<0.000001) with no misclassification. This highlights the significant influence of geographic coordinates on
the occurrence of Avena species. The models revealed hidden relationships between morphological traits that are
not easily detectable through traditional statistical methods. For example, seed color can be partially predicted by
other seed traits combined with geographic coordinates. When comparing the two species, A. fatua predominantly
had the lemma attachment point in the upper half, while A. sterilis had it in the lower half. A. sterilis exhibited slightly
longer seeds and hairs than A. fatua, while seed hairiness and mass were similar in both species. A. fatua populations
primarily had brown, light brown, and black colors, while A. sterilis populations had black, brown, and yellow colors.
Conclusions Distinguishing A. fatua from A. sterilis based solely on individual characteristics is challenging due to
their shared traits and considerable variability of traits within each species. However, it is possible to classify these
species by combining multiple seed traits. This approach also has significant potential for exploring relationships
among different traits that are typically difficult to assess using conventional methods.
PB  - BMC , United Kingdom
T2  - BMC Plant Biolog
T1  - Application of artificial neural networks to classify Avena fatua and Avena sterilis based on seed traits: insights from European Avena populations primarily from the Balkan Region
SP  - 537
VL  - 24
DO  - 10.1186/s12870-024-05266-3
ER  - 

@article{
author = "Oveisi, Mostafa and Šikuljak, Danijela and Anđelković, Ana and Božić, Dragana and Trkulja, Nenad and Piri, Ramin and Poczai, Peter and Vrbničanin, Sava",
year = "2024",
abstract = "Background Avena fatua and A. sterilis are challenging to distinguish due to their strong similarities. However,
Artificial Neural Networks (ANN) can effectively extract patterns and identify these species. We measured seed traits
of Avena species from 122 locations across the Balkans and from some populations from southern, western, and
central Europe (total over 22 000 seeds). The inputs for the ANN model included seed mass, size, color, hairiness, and
placement of the awn attachment on the lemma.
Results The ANN model achieved high classification accuracy for A. fatua and A. sterilis (R2>0.99, RASE<0.0003) with
no misclassification. Incorporating geographic coordinates as inputs also resulted in successful classification (R2>0.99,
RASE<0.000001) with no misclassification. This highlights the significant influence of geographic coordinates on
the occurrence of Avena species. The models revealed hidden relationships between morphological traits that are
not easily detectable through traditional statistical methods. For example, seed color can be partially predicted by
other seed traits combined with geographic coordinates. When comparing the two species, A. fatua predominantly
had the lemma attachment point in the upper half, while A. sterilis had it in the lower half. A. sterilis exhibited slightly
longer seeds and hairs than A. fatua, while seed hairiness and mass were similar in both species. A. fatua populations
primarily had brown, light brown, and black colors, while A. sterilis populations had black, brown, and yellow colors.
Conclusions Distinguishing A. fatua from A. sterilis based solely on individual characteristics is challenging due to
their shared traits and considerable variability of traits within each species. However, it is possible to classify these
species by combining multiple seed traits. This approach also has significant potential for exploring relationships
among different traits that are typically difficult to assess using conventional methods.",
publisher = "BMC , United Kingdom",
journal = "BMC Plant Biolog",
title = "Application of artificial neural networks to classify Avena fatua and Avena sterilis based on seed traits: insights from European Avena populations primarily from the Balkan Region",
pages = "537",
volume = "24",
doi = "10.1186/s12870-024-05266-3"
}

Oveisi, M., Šikuljak, D., Anđelković, A., Božić, D., Trkulja, N., Piri, R., Poczai, P.,& Vrbničanin, S.. (2024). Application of artificial neural networks to classify Avena fatua and Avena sterilis based on seed traits: insights from European Avena populations primarily from the Balkan Region. in BMC Plant Biolog
BMC , United Kingdom., 24, 537.
https://doi.org/10.1186/s12870-024-05266-3

Oveisi M, Šikuljak D, Anđelković A, Božić D, Trkulja N, Piri R, Poczai P, Vrbničanin S. Application of artificial neural networks to classify Avena fatua and Avena sterilis based on seed traits: insights from European Avena populations primarily from the Balkan Region. in BMC Plant Biolog. 2024;24:537.
doi:10.1186/s12870-024-05266-3 .

Oveisi, Mostafa, Šikuljak, Danijela, Anđelković, Ana, Božić, Dragana, Trkulja, Nenad, Piri, Ramin, Poczai, Peter, Vrbničanin, Sava, "Application of artificial neural networks to classify Avena fatua and Avena sterilis based on seed traits: insights from European Avena populations primarily from the Balkan Region" in BMC Plant Biolog, 24 (2024):537,
https://doi.org/10.1186/s12870-024-05266-3 . .

TY  - CONF
AU  - Šikuljak, Danijela
AU  - Oveisi, Mostafa
AU  - Anđelković, Ana
AU  - Božić, Dragana
AU  - Vrbničanin, Sava
PY  - 2023
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/1194
AB  - Avena sp. je prisutna u poljima žitarica. Dve najčešće prisutne vrste su A. fatua and A.
sterilis. Veoma su slične i praktično ih je teško razlikovati. Korišćenjem metode “Model
veštačkih neuronskih mreža” (MVNM) se mogu izdvojiti uzorci i na pouzdan način razdvojiti
navedene vrste. Razdvajanje je obavljeno na osnovu osobina semena Avena sp. prikupljenih sa
122 lokaliteta širom Balkana i severoistočne, zapadne i centralne Evrope (oko 22000
semena). Analizirane osobine semena: masa, veličina, boja, dlakavost i pozicija osja su
stavljene u odnos sa geografskom lokacijom uzorkovanja. Nakon analize dobijena je
pouzdanost razdvajanja Avena sterilis vs Avena fatua R2>0.99 i RASE<0.000001 (uz nivo
greške 0). Prednost ovog modela je što analizira relacije morfoloških osobina koje se ne mogu
lako definisati standardnim statističkim metodama. Kao primer se može navesti boja semena
koja se može upoređivati vezano za geografski lokalitet i druge osobine semena.
Poređenjem navedenih vrsta, preko posmatranih parametara, je konstatovano: 1)
pozicija osja kod A. fatua pretežno se nalazi na gornjoj polovini leme a kod A. sterilis na donjoj
polovini; 2) A. sterilis ima nešto duže seme i dlačice; 3) masa i dlakavost semena su slični kod
obe vrste i 4) semena A.fatua su uglavnom braon, svetlo braon i crne boje a kod A. sterilis crne,
braon i žučkaste.
Analiza je pokazala da razdvajanje A. fatua vs A. sterillis na osnovu pojedinačnih
osobina, a zbog prisustva zajedničkih osobina i stepena variranja, predstavlja veliki izazov.
Zbog toga ovaj pristup (MVNM) predstavlja potencijal za proučavanje morfoloških,
ekoloških i fizioloških osobina blisko srodnih vrsta.
PB  - Društvo za zaštitu bilja
C3  - Zbornik XVII simpozijuma o zaštiti bilja, 27-30. novembar 2023, Zlatibor, Srbija
T1  - Primena modela veštačkih neuronskih mreža za utvrđivanje razlika između populacija Avena fatua i Avena sterilis na osnovu karakteristika semena
SP  - 72
ER  - 

@conference{
author = "Šikuljak, Danijela and Oveisi, Mostafa and Anđelković, Ana and Božić, Dragana and Vrbničanin, Sava",
year = "2023",
abstract = "Avena sp. je prisutna u poljima žitarica. Dve najčešće prisutne vrste su A. fatua and A.
sterilis. Veoma su slične i praktično ih je teško razlikovati. Korišćenjem metode “Model
veštačkih neuronskih mreža” (MVNM) se mogu izdvojiti uzorci i na pouzdan način razdvojiti
navedene vrste. Razdvajanje je obavljeno na osnovu osobina semena Avena sp. prikupljenih sa
122 lokaliteta širom Balkana i severoistočne, zapadne i centralne Evrope (oko 22000
semena). Analizirane osobine semena: masa, veličina, boja, dlakavost i pozicija osja su
stavljene u odnos sa geografskom lokacijom uzorkovanja. Nakon analize dobijena je
pouzdanost razdvajanja Avena sterilis vs Avena fatua R2>0.99 i RASE<0.000001 (uz nivo
greške 0). Prednost ovog modela je što analizira relacije morfoloških osobina koje se ne mogu
lako definisati standardnim statističkim metodama. Kao primer se može navesti boja semena
koja se može upoređivati vezano za geografski lokalitet i druge osobine semena.
Poređenjem navedenih vrsta, preko posmatranih parametara, je konstatovano: 1)
pozicija osja kod A. fatua pretežno se nalazi na gornjoj polovini leme a kod A. sterilis na donjoj
polovini; 2) A. sterilis ima nešto duže seme i dlačice; 3) masa i dlakavost semena su slični kod
obe vrste i 4) semena A.fatua su uglavnom braon, svetlo braon i crne boje a kod A. sterilis crne,
braon i žučkaste.
Analiza je pokazala da razdvajanje A. fatua vs A. sterillis na osnovu pojedinačnih
osobina, a zbog prisustva zajedničkih osobina i stepena variranja, predstavlja veliki izazov.
Zbog toga ovaj pristup (MVNM) predstavlja potencijal za proučavanje morfoloških,
ekoloških i fizioloških osobina blisko srodnih vrsta.",
publisher = "Društvo za zaštitu bilja",
journal = "Zbornik XVII simpozijuma o zaštiti bilja, 27-30. novembar 2023, Zlatibor, Srbija",
title = "Primena modela veštačkih neuronskih mreža za utvrđivanje razlika između populacija Avena fatua i Avena sterilis na osnovu karakteristika semena",
pages = "72"
}

Šikuljak, D., Oveisi, M., Anđelković, A., Božić, D.,& Vrbničanin, S.. (2023). Primena modela veštačkih neuronskih mreža za utvrđivanje razlika između populacija Avena fatua i Avena sterilis na osnovu karakteristika semena. in Zbornik XVII simpozijuma o zaštiti bilja, 27-30. novembar 2023, Zlatibor, Srbija
Društvo za zaštitu bilja., 72.

Šikuljak D, Oveisi M, Anđelković A, Božić D, Vrbničanin S. Primena modela veštačkih neuronskih mreža za utvrđivanje razlika između populacija Avena fatua i Avena sterilis na osnovu karakteristika semena. in Zbornik XVII simpozijuma o zaštiti bilja, 27-30. novembar 2023, Zlatibor, Srbija. 2023;:72..

Šikuljak, Danijela, Oveisi, Mostafa, Anđelković, Ana, Božić, Dragana, Vrbničanin, Sava, "Primena modela veštačkih neuronskih mreža za utvrđivanje razlika između populacija Avena fatua i Avena sterilis na osnovu karakteristika semena" in Zbornik XVII simpozijuma o zaštiti bilja, 27-30. novembar 2023, Zlatibor, Srbija (2023):72.

TY  - JOUR
AU  - Savić, Aleksandra
AU  - Oveisi, Mostafa
AU  - Božić, Dragana
AU  - Pavlovic, Danijela
AU  - Saulić, Markola
AU  - Muller Scharer, Heinz
AU  - Vrbničanin, Sava
PY  - 2021
UR  - https://plantarum.izbis.bg.ac.rs/handle/123456789/734
AB  - Recent reports of the presence of Ambrosia trifida (AT) in areas infested by A. artemisiifolia (AA) in Serbia warn of the impending establishment of a more damaging crop weed. Here, we test the potential competitive effects of these two weed species. We conducted a field competition study in 2016 and 2017 as a replacement series experiment arranged in a split plot, with main plots (20.5 m × 2 m) at total plant densities of 10 and 100 plants/m2, and sub-plots (3 m × 2 m) at the proportion of AT to AA of 100:0, 80:20, 60:40, 40:60, 20:80 and 0:100. Individual plant biomass (IPB) for AT was lowest when grown in monoculture, while AA reached its highest IPB in its monoculture. With AT < 40%, the AT IPB was larger than (2017) or the same as AA (2016). With AT > 40%, its IPB decreased due to increased intraspecific competition. We obtained the lowest sub-plot biomass (SPB) of AT + AA in mixtures with 40:60 and 60:40 ratios, and also the highest SPB of other weed species. We show that despite a larger leaf area, AT may not fully replace AA and thus not become a new threat to crops, as it not only suffers from intraspecific competition at high densities, but also from interspecific competition with AA. Therefore, crops may benefit from a stable coexistence of both species as compared to highly dominant AT or AA. Further studies in the presence of crops are needed to confirm this hypothesis.
PB  - Blackwell Publishing Ltd
T2  - Weed Research
T1  - Competition between Ambrosia artemisiifolia and Ambrosia trifida: Is there a threat of a stronger competitor?
EP  - 306
IS  - 4
SP  - 298
VL  - 61
DO  - 10.1111/wre.12479
ER  - 

@article{
author = "Savić, Aleksandra and Oveisi, Mostafa and Božić, Dragana and Pavlovic, Danijela and Saulić, Markola and Muller Scharer, Heinz and Vrbničanin, Sava",
year = "2021",
abstract = "Recent reports of the presence of Ambrosia trifida (AT) in areas infested by A. artemisiifolia (AA) in Serbia warn of the impending establishment of a more damaging crop weed. Here, we test the potential competitive effects of these two weed species. We conducted a field competition study in 2016 and 2017 as a replacement series experiment arranged in a split plot, with main plots (20.5 m × 2 m) at total plant densities of 10 and 100 plants/m2, and sub-plots (3 m × 2 m) at the proportion of AT to AA of 100:0, 80:20, 60:40, 40:60, 20:80 and 0:100. Individual plant biomass (IPB) for AT was lowest when grown in monoculture, while AA reached its highest IPB in its monoculture. With AT < 40%, the AT IPB was larger than (2017) or the same as AA (2016). With AT > 40%, its IPB decreased due to increased intraspecific competition. We obtained the lowest sub-plot biomass (SPB) of AT + AA in mixtures with 40:60 and 60:40 ratios, and also the highest SPB of other weed species. We show that despite a larger leaf area, AT may not fully replace AA and thus not become a new threat to crops, as it not only suffers from intraspecific competition at high densities, but also from interspecific competition with AA. Therefore, crops may benefit from a stable coexistence of both species as compared to highly dominant AT or AA. Further studies in the presence of crops are needed to confirm this hypothesis.",
publisher = "Blackwell Publishing Ltd",
journal = "Weed Research",
title = "Competition between Ambrosia artemisiifolia and Ambrosia trifida: Is there a threat of a stronger competitor?",
pages = "306-298",
number = "4",
volume = "61",
doi = "10.1111/wre.12479"
}

Savić, A., Oveisi, M., Božić, D., Pavlovic, D., Saulić, M., Muller Scharer, H.,& Vrbničanin, S.. (2021). Competition between Ambrosia artemisiifolia and Ambrosia trifida: Is there a threat of a stronger competitor?. in Weed Research
Blackwell Publishing Ltd., 61(4), 298-306.
https://doi.org/10.1111/wre.12479

Savić A, Oveisi M, Božić D, Pavlovic D, Saulić M, Muller Scharer H, Vrbničanin S. Competition between Ambrosia artemisiifolia and Ambrosia trifida: Is there a threat of a stronger competitor?. in Weed Research. 2021;61(4):298-306.
doi:10.1111/wre.12479 .

Savić, Aleksandra, Oveisi, Mostafa, Božić, Dragana, Pavlovic, Danijela, Saulić, Markola, Muller Scharer, Heinz, Vrbničanin, Sava, "Competition between Ambrosia artemisiifolia and Ambrosia trifida: Is there a threat of a stronger competitor?" in Weed Research, 61, no. 4 (2021):298-306,
https://doi.org/10.1111/wre.12479 . .