TY  - JOUR
AU  - Golubović, Ana
AU  - Anđelković, Marko
AU  - Tomović, L.
AU  - Arsovski, D.
AU  - Gvozdenović, S.
AU  - Šukalo, G.
AU  - Ajtić, R.
AU  - Bonnet, X.
PY  - 2021
UR  - https://onlinelibrary.wiley.com/doi/10.1111/jzo.12882
UR  - https://radar.ibiss.bg.ac.rs/handle/123456789/4198
AB  - Once cornered by a predator, prey can try to intimidate the assailant or repel it, with irritating sprays for example. If seized, they may scratch, bite or struggle to cause the predator to release its grip. At the other extreme, they can adopt passive behaviours such as death feigning (DF, i.e. thanatosis). DF is observed widely across the animal kingdom; it usually involves a combination of displays such as immobility, supination, leg-folding, mouth opening and release of nauseating secretions. When displaying DF, individuals are highly vulnerable and effectively bet on the attitude of the predator; this risky choice is presumably under positive selection. We explored how propensity for DF varies among and within populations of dice snakes (Natrix tessellata). We also considered the influence of sex, body size, reproductive status, colour morph and presence of injuries (N = 2760 snakes; five populations). DF propensity differed among populations, possibly due to variation in local predation pressures. Larger snakes displayed DF more frequently and carried more signs of probable past predation attempts (scars and recent injuries). We found no sex effect on antipredator behaviour. Gravid females used DF less frequently compared with non-gravid females. Differential expression of DF across populations, body sizes and reproductive status suggests that this complex behaviour was selected to respond to environmental and intrinsic factors. Future studies should explore which elements affect duration, intensity and success of DF in defence against various predators.
PB  - Blackwell Publishing Ltd
T2  - Journal of Zoology
T1  - Death‐feigning propensity varies within dice snake populations but not with sex or colour morph
DO  - 10.1111/jzo.12882
SP  - jzo.12882
ER  - 

@article{
author = "Golubović, Ana and Anđelković, Marko and Tomović, L. and Arsovski, D. and Gvozdenović, S. and Šukalo, G. and Ajtić, R. and Bonnet, X.",
year = "2021",
abstract = "Once cornered by a predator, prey can try to intimidate the assailant or repel it, with irritating sprays for example. If seized, they may scratch, bite or struggle to cause the predator to release its grip. At the other extreme, they can adopt passive behaviours such as death feigning (DF, i.e. thanatosis). DF is observed widely across the animal kingdom; it usually involves a combination of displays such as immobility, supination, leg-folding, mouth opening and release of nauseating secretions. When displaying DF, individuals are highly vulnerable and effectively bet on the attitude of the predator; this risky choice is presumably under positive selection. We explored how propensity for DF varies among and within populations of dice snakes (Natrix tessellata). We also considered the influence of sex, body size, reproductive status, colour morph and presence of injuries (N = 2760 snakes; five populations). DF propensity differed among populations, possibly due to variation in local predation pressures. Larger snakes displayed DF more frequently and carried more signs of probable past predation attempts (scars and recent injuries). We found no sex effect on antipredator behaviour. Gravid females used DF less frequently compared with non-gravid females. Differential expression of DF across populations, body sizes and reproductive status suggests that this complex behaviour was selected to respond to environmental and intrinsic factors. Future studies should explore which elements affect duration, intensity and success of DF in defence against various predators.",
publisher = "Blackwell Publishing Ltd",
journal = "Journal of Zoology",
title = "Death‐feigning propensity varies within dice snake populations but not with sex or colour morph",
doi = "10.1111/jzo.12882",
pages = "jzo.12882"
}

Golubović, A., Anđelković, M., Tomović, L., Arsovski, D., Gvozdenović, S., Šukalo, G., Ajtić, R.,& Bonnet, X.. (2021). Death‐feigning propensity varies within dice snake populations but not with sex or colour morph. in Journal of Zoology
Blackwell Publishing Ltd., jzo.12882.
https://doi.org/10.1111/jzo.12882

Golubović A, Anđelković M, Tomović L, Arsovski D, Gvozdenović S, Šukalo G, Ajtić R, Bonnet X. Death‐feigning propensity varies within dice snake populations but not with sex or colour morph. in Journal of Zoology. 2021;:jzo.12882.
doi:10.1111/jzo.12882 .

Golubović, Ana, Anđelković, Marko, Tomović, L., Arsovski, D., Gvozdenović, S., Šukalo, G., Ajtić, R., Bonnet, X., "Death‐feigning propensity varies within dice snake populations but not with sex or colour morph" in Journal of Zoology (2021):jzo.12882,
https://doi.org/10.1111/jzo.12882 . .

TY  - CONF
AU  - Golubović, Ana
AU  - Anđelković, Marko
AU  - Gvozdenović, Slađana
AU  - Šukalo, Goran
AU  - Tomović, Ljiljana
AU  - Bonnet, Xavier
PY  - 2019
UR  - http://radar.ibiss.bg.ac.rs/handle/123456789/5417
AB  - Dice snakes (Natrix tessellata) display an extensive repertoire of antipredator behaviors. They flee when they detect an attacker, and if captured, they vigorously struggle to evade. They spin their body, while spraying the foe with a malodorous mixture of cloacal content and cloacal gland secretions. Ultimately, dice snakes can switch to death-feigning (DF, thanatosis), i.e. tonic immobility in inverted position; usually opening their mouth, protruding their tongue, and sometimes producing bubbles with blood and saliva. However DF is a dangerous option since vital organs, like the liver, are exposed to the predator. We examined antipredator behaviors triggered by human observers, comparing capture-induced DF among five populations. DF prevalence ranged from 6.4% to 31.5%, probably due to different local predator pressures. We found no effects of dorsal coloration pattern or sex on DF frequencies. In Golem Grad population, a large sample (N=1,909) showed that DF frequency increased with body size. This might indicate to protective effect of DF from gape-limited predators. DF was three times less frequent in gravid than in non-gravid females. In another experiment we compared duration of DF in water and on land, after half a minute long standardized manipulation. Snakes released in container with water significantly decreased DF duration comparing to those released on land. Overall, different factors influence the occurrence and duration of DF, suggesting that this “desperate” attempt is under selection.
PB  - Milan, Italy: University of Milan, the University of Pavia, the Natural History Museum of Milan and the University of Milano-Bicocca
C3  - XX European Congress of Herpetology. Program & Abstracts; 2019 Sep 2-6; Milan, Italy
T1  - Oscar deserving performance: death-feigning in dice snakes
SP  - 71
UR  - https://hdl.handle.net/21.15107/rcub_ibiss_5417
ER  - 

@conference{
author = "Golubović, Ana and Anđelković, Marko and Gvozdenović, Slađana and Šukalo, Goran and Tomović, Ljiljana and Bonnet, Xavier",
year = "2019",
abstract = "Dice snakes (Natrix tessellata) display an extensive repertoire of antipredator behaviors. They flee when they detect an attacker, and if captured, they vigorously struggle to evade. They spin their body, while spraying the foe with a malodorous mixture of cloacal content and cloacal gland secretions. Ultimately, dice snakes can switch to death-feigning (DF, thanatosis), i.e. tonic immobility in inverted position; usually opening their mouth, protruding their tongue, and sometimes producing bubbles with blood and saliva. However DF is a dangerous option since vital organs, like the liver, are exposed to the predator. We examined antipredator behaviors triggered by human observers, comparing capture-induced DF among five populations. DF prevalence ranged from 6.4% to 31.5%, probably due to different local predator pressures. We found no effects of dorsal coloration pattern or sex on DF frequencies. In Golem Grad population, a large sample (N=1,909) showed that DF frequency increased with body size. This might indicate to protective effect of DF from gape-limited predators. DF was three times less frequent in gravid than in non-gravid females. In another experiment we compared duration of DF in water and on land, after half a minute long standardized manipulation. Snakes released in container with water significantly decreased DF duration comparing to those released on land. Overall, different factors influence the occurrence and duration of DF, suggesting that this “desperate” attempt is under selection.",
publisher = "Milan, Italy: University of Milan, the University of Pavia, the Natural History Museum of Milan and the University of Milano-Bicocca",
journal = "XX European Congress of Herpetology. Program & Abstracts; 2019 Sep 2-6; Milan, Italy",
title = "Oscar deserving performance: death-feigning in dice snakes",
pages = "71",
url = "https://hdl.handle.net/21.15107/rcub_ibiss_5417"
}

Golubović, A., Anđelković, M., Gvozdenović, S., Šukalo, G., Tomović, L.,& Bonnet, X.. (2019). Oscar deserving performance: death-feigning in dice snakes. in XX European Congress of Herpetology. Program & Abstracts; 2019 Sep 2-6; Milan, Italy
Milan, Italy: University of Milan, the University of Pavia, the Natural History Museum of Milan and the University of Milano-Bicocca., 71.
https://hdl.handle.net/21.15107/rcub_ibiss_5417

Golubović A, Anđelković M, Gvozdenović S, Šukalo G, Tomović L, Bonnet X. Oscar deserving performance: death-feigning in dice snakes. in XX European Congress of Herpetology. Program & Abstracts; 2019 Sep 2-6; Milan, Italy. 2019;:71.
https://hdl.handle.net/21.15107/rcub_ibiss_5417 .

Golubović, Ana, Anđelković, Marko, Gvozdenović, Slađana, Šukalo, Goran, Tomović, Ljiljana, Bonnet, Xavier, "Oscar deserving performance: death-feigning in dice snakes" in XX European Congress of Herpetology. Program & Abstracts; 2019 Sep 2-6; Milan, Italy (2019):71,
https://hdl.handle.net/21.15107/rcub_ibiss_5417 .