Snezana Zivanovic

@article{rees_presence_2022,

title = {The presence of silver nanoparticles reduces demand for dissolved phosphorus to the benefit of biological nitrogen fixation in the coastal eastern Mediterranean Sea},

author = {Andrew P Rees and Eleonora Faraggiana and Karen Tait and Mauro Celussi and Eleni Dafnomilli and Vincenzo Manna and Andrew Manning and Paraskevi Pitta and Anastasia Tsiola and Snežana Živanović},

url = {https://imbbc.hcmr.gr/wp-content/uploads/2023/01/2023-Rees-fmars-6.pdf

https://www.frontiersin.org/articles/10.3389/fmars.2022.907269/full},

doi = {10.3389/fmars.2022.907269},

issn = {2296-7745},

year  = {2023},

date = {2023-01-23},

urldate = {2023-01-23},

journal = {Frontiers in Marine Science},

volume = {9},

pages = {907269},

abstract = {The release of silver into the marine environment is of growing concern as its impact on marine life is not fully understood. Despite previous experiments that have shown toxic effects of silver as nanoparticles (AgNPs) and as free ions (Ag 

 + 

 ) on microbial organisms, the impact on important biogeochemical processes, such as marine nitrogen fixation, remains relatively unexplored. The present study investigated the impact of AgNPs and Ag 

 + 

 on nitrogen fixation activity in oligotrophic coastal ecosystems. Nine mesocosm enclosures were set-up in Crete, Greece, for twelve days during May 2019. Three mesocosms were left unamended at ambient light and temperature; three were manipulated with 50 ng AgNPs L 

 -1 

 d 

 -1 

 and three were amended with 50 ng Ag 

 + 

 L 

 -1 

 d 

 -1 

 . Over the duration of the experiment, mean nitrogen fixation rates proved higher in treated waters; 0.28 ± 0.24 nmol N L 

 -1 

 d 

 -1 

 and 0.21 ± 0.19 nmol N L 

 -1 

 d 

 -1 

 in AgNP and Ag 

 + 

 which were 2.2 (p< 0.001) and 1.6 (not significant) times higher than control rates of 0.13 ± 0.07 nmol N L 

 -1 

 d 

 -1 

 respectively. Changes in nitrogen fixation rates were paralleled by significantly higher concentrations of phosphate and silicate in treated versus control mesocosms, suggesting an inhibition of the uptake of these nutrients by non-diazotrophic groups. Sequencing of 16S and 18S rRNA genes showed shifts in community composition over time but only very minor changes could be linked to the Ag treatments. Decreases to the relative abundance of three diatom species were observed in the Ag treatments but these were considered insufficient to support the relative differences in nutrient concentration. It is therefore speculated that there was physiological disruption of nutrient uptake mechanisms of the non-diazotrophic community. A number of potential diazotrophs were detected and the relative sequence abundance of a number of known nitrogen fixing taxa, including 

 Burkholderiaceae 

 , 

 Oceanospirillales 

 and 

 Pseudomonadales 

 correlated with measured nitrogen fixation rates. Phosphorus limitation of diazotrophic activity was therefore lowered relative to other microbial groups in silver amended treatments and significant increases in particulate nitrogen for both Ag treatments indicate an enhancement in cellular N for the nitrogen fixing communities.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{galgani_microplastics_2019,

title = {Microplastics increase the marine production of particulate forms of organic matter},

author = {Luisa Galgani and Manolis Tsapakis and Paraskevi Pitta and Anastasia Tsiola and Eleni Tzempelikou and Ioanna Kalantzi and Chiara Esposito and Arturo Loiselle and Anastasia Tsotskou and Snezana Zivanovic and Eleni Dafnomili and Santi Diliberto and Kyriaki Mylona and Iordanis Magiopoulos and Christina Zeri and Elli Pitta and Steven A Loiselle},

url = {https://iopscience.iop.org/article/10.1088/1748-9326/ab59ca},

doi = {10.1088/1748-9326/ab59ca},

issn = {1748-9326},

year  = {2019},

date = {2019-12-01},

urldate = {2022-01-17},

journal = {Environmental Research Letters},

volume = {14},

number = {12},

pages = {124085},

abstract = {Abstract 

 Microplastics are a major environmental challenge, being ubiquitous and persistent as to represent a new component in all marine environments. As any biogenic particle, microplastics provide surfaces for microbial growth and biofilm production, which largely consists of carbohydrates and proteins. Biofilms influence microbial activity and modify particle buoyancy, and therefore control the fate of microplastics at sea. In a simulated ‘plastic ocean’, three mesocosms containing oligotrophic seawater were amended with polystyrene microbeads and compared to three control mesocosms. The evolution of organic matter, microbial communities and nutrient concentrations was monitored over 12 days. The results indicated that microplastics increased the production of organic carbon and its aggregation into gel particulates. The observed increase of gel-like organics has implications on the marine biological pump as well as the transport of microplastics in the ocean.},

note = {BIODIV},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{rossano_characterisation_2013,

title = {Characterisation of port waters through optical measurements within the MAPMED project},

author = {C Rossano and S Gambineri and L Massi and E Chatzinikolaou and E Dafnomili and S Zivanovic and C Arvanitidis and F Scapini and L Lazzara},

year  = {2013},

date = {2013-01-01},

journal = {Biologia Marina Mediterranea},

volume = {20},

pages = {220--221},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{pitta_natural_1998,

title = {Natural vs. mariculture induced variability in nutrients and plankton in the eastern Mediterranean},

author = {Paraskevi Pitta and Ioannis Karakassis and Manolis Tsapakis and Snezana Zivanovic},

url = {http://link.springer.com/10.1023/A:1003501832069},

doi = {10.1023/A:1003501832069},

issn = {00188158},

year  = {1998},

date = {1998-01-01},

urldate = {2020-08-18},

journal = {Hydrobiologia},

volume = {391},

number = {1/3},

pages = {179--192},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{dando_earthquakes_1995,

title = {Earthquakes increase hydrothermal venting and nutrient inputs into the Aegean},

author = {P R Dando and J A Hughes and Y Leahy and L J Taylor and S Zivanovic},

url = {https://linkinghub.elsevier.com/retrieve/pii/0278434394E0031G},

doi = {10.1016/0278-4343(94)E0031-G},

issn = {02784343},

year  = {1995},

date = {1995-05-01},

urldate = {2020-08-17},

journal = {Continental Shelf Research},

volume = {15},

number = {6},

pages = {655--662},

keywords = {},

pubstate = {published},

tppubtype = {article}

}