Regulation of toxic chemicals in the Mediterranean: the need for an adequate strategy

Swindlehurst, R. J.; Johnston, Paul; Tröndle, S.; Stringer, Ruth; Stephenson, Angela; Stone, Ian

doi:10.1016/0048-9697(95)04719-x

Cited by 9 publications

(1 citation statement)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the recent past, organohalides were found to be present in sediments of this river. In the study location, HCB and hexachlorocyclohexane are dominant sediment contaminants (Lacorte et al , 2006), whereas the presence of several other chlorinated contaminants such as chlorinated ethenes and 1,2‐dichloroethane was also detected in the early 1990s (Swindlehurst et al , 1995). Our previous work in Ebro's sediments showed the presence of a dynamic Dehalococcoides population, including a wide range of rdh genes with high identity to those originating from chlorobenzene and chloroethene dehalogenating bacteria (Taş et al , 2009).…”

Section: Introductionmentioning

confidence: 99%

Concurrent hexachlorobenzene and chloroethene transformation by endogenous dechlorinating microorganisms in the Ebro River sediment

Taş

Heilig

Eekert

et al. 2010

FEMS Microbiology Ecology

View full text Add to dashboard Cite

The ability of Dehalococcoides spp. to reduce chlorinated compounds offers a great potential for bioremediation and/or bioaugmentation of contaminated environments. So far, however, our knowledge of the activity of Dehalococcoides spp. in situ is limited to only a few subsurface environments. The aim of this study was to broaden this knowledge to other environments, and we investigated the role of Dehalococcoides spp. in the transformation of chlorinated benzenes and chlorinated ethenes in the Ebro River (Spain) sediments. Lab-scale batch microcosms were used to follow the growth and abundance of Dehalococcoides spp. during the transformation of selected chlorinated compounds. We applied biomolecular tools targeting the 16S rRNA, the 16S rRNA gene and several functional genes involved in dechlorination in combination with chemical measurements. The growth of Dehalococcoides spp. and the differential expression of several reductive dehalogenase genes during the dechlorination process could be demonstrated. Furthermore, 16S rRNA gene-based clone libraries of dechlorinating river sediment showed a complex community structure and indicated the involvement of several additional bacterial genera in the transformation process, underlining the remarkable potential of this rivers' sediment to transform different halo-organic pollutants.

show abstract

Section: Introductionmentioning

confidence: 99%

Concurrent hexachlorobenzene and chloroethene transformation by endogenous dechlorinating microorganisms in the Ebro River sediment

Taş

Heilig

Eekert

et al. 2010

FEMS Microbiology Ecology

View full text Add to dashboard Cite

show abstract

PCB Levels and Accumulation Patterns in Waterbird Eggs and in Their Prey at Lake Kerkini, a North-Eastern Mediterranean Wetland of International Importance

Antoniadou

Konstantinou

Goutner

et al. 2007

Arch Environ Contam Toxicol

View full text Add to dashboard Cite

Seven "target" PCB levels were determined and compared in waterbird eggs, in their prey, and in water at Lake Kerkini, northern Greece, to investigate PCB bioaccumulation patterns and to define the best bioindicator of target PCBs for this area. PCBs were analysed from eggs of Phalacrocorax carbo, Podiceps cristatus, Ardea cinerea, Egretta garzetta, and Nycticorax nycticorax and from prey types Alburnus alburnus, Rutilus rutilus, Lepomis gibbosus. Carassius auratus, and Rana sp. PCBs analysed were detected in all bird eggs, prey, and water but contamination patterns differed among these sample types. The lipid-corrected geometric means of the congeners analysed were significantly different among most bird species and among some prey species. PCB congeners 118, 138, 153, and 180 accounted for around 80% of the total PCB contamination in bird egg samples. Percent congener concentrations of high-chlorinated PCBs tended to increase from water through prey to most bird egg samples whereas the low chlorinated PCBs (28 and 52) decreased. Bioaccumulation factors (BAFs) also exhibited an increasing trend for higher chlorinated PCBs from prey types to bird eggs. The greatest BAFs of six of the congeners were shared between Phalacrocorax carbo and Ardea cinerea. Among prey, the BAFs of four PCBs were highest in Lepomis gibbosus. Biomagnification factors varied between 1.01 and 39.57. In contrast to low chlorinated PCBs, high chlorinated congeners biomagnified considerably through fish prey. The highest biomagnification took place in Phalacrocorax carbo. No relationship was found between the lipid content of samples and BAFs of PCBs probably due to biotransformation differences of the congeners in the biota sampled. Due to the greatest PCB concentrations especially of the higher chlorinated PCBs in the eggs of Phalacrocorax carbo and its considerable bioaccumulation tendencies, it is proposed as the best PCB biomonitor of target PCBs at Lake Kerkini. Lepomis gibbosus had the highest concentrations of most congeners and exhibited the greatest bioaccumulative properties among prey and can be used as an alternative biomonitor.

show abstract

Organic contaminant loads into the Western Mediterranean Sea: Estimate of Ebro River inputs

et al. 2006

View full text Add to dashboard Cite

Regulation of toxic chemicals in the Mediterranean: the need for an adequate strategy

Cited by 9 publications

References 40 publications

Concurrent hexachlorobenzene and chloroethene transformation by endogenous dechlorinating microorganisms in the Ebro River sediment

Concurrent hexachlorobenzene and chloroethene transformation by endogenous dechlorinating microorganisms in the Ebro River sediment

PCB Levels and Accumulation Patterns in Waterbird Eggs and in Their Prey at Lake Kerkini, a North-Eastern Mediterranean Wetland of International Importance

Organic contaminant loads into the Western Mediterranean Sea: Estimate of Ebro River inputs

Contact Info

Product

Resources

About