Nafsika Papageorgiou

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Twenty-eight metals and elements were measured in the muscle, liver, gills, bone and intestine of farmed seabass and gilthead seabream from four Mediterranean fish farms. The influence of fish species and the effect of environmental conditions on the metal accumulation in fish tissues was investigated. Most concentrations were lower in muscle and higher in(More)
A common source of disturbance for coastal aquatic habitats is nutrient enrichment through anthropogenic activities. Although the water column bacterioplankton communities in these environments have been characterized in some cases, changes in α-diversity and/or the abundances of specific taxonomic groups across enriched habitats remain unclear. Here, we(More)
The study of ecosystem functioning - the role which organisms play in an ecosystem - is becoming increasingly important in marine ecological research. The functional structure of a community can be represented by a set of functional traits assigned to behavioural, reproductive and morphological characteristics. The collection of these traits from the(More)
The response of phytoplankton populations from surface ultra-oligotrophic waters of the Eastern Mediterranean Sea to Saharan dust additions was studied during a 10-day mesocosm experiment in May 2014. A set of triplicate mesocosms entitled “Single Addition” treatment (SA) was amended with Saharan dust once, while another triplicate set entitled “Repetitive(More)
Trace element concentrations in sediment were investigated at four fish farms in the Eastern Mediterranean Sea. Fish farms effects were negligible beyond 25-50 m from the edge of the cages. Based on elemental distribution, sediments from the farms were separated into coarse oxidized and silty reduced ones. Fish feed is richer in P, Zn and Cd than reference(More)
The aim of this paper was to test how benthic fauna and biogeochemical properties of sediment will vary in response to similar levels of organic enrichment (induced by fish farming) as a function of bottom-habitat type (i.e., mud versus seagrass/coarse sediments), distance from the enrichment source and depth. Our results showed that samples from silty(More)
Farmed fish and wild fish aggregating in the vicinity of four Mediterranean fish farms with different environmental conditions were sampled. Levels of metals (including As and Se) were measured in the muscle, liver, gills, bone and intestine. The wild fish from sites with anoxic substrata accumulate metals (including As and Se) from the ambient habitat in(More)
Collelungo beach (Maremma Park, NW Italy), was sampled quantitatively for macrofauna, meiofauna and bacteria in May 2003; several physicochemical variables and variables associated with food availability and sediment structure were also measured. Replicated samples were collected from three sites representing natural conditions, an erosion regime, and the(More)
We investigated changes in sediment bacterial community structure across a spatial organic enrichment gradient associated with fish farms in two different sites in the Eastern Mediterranean (Greece). The observed trend was similar at both fish farms even though they are far from each other. The mean number of the most abundant operational taxonomic units(More)
Citation: Herut B, Rahav E, Tsagaraki TM, Giannakourou A, Tsiola A, Psarra S, Lagaria A, Papageorgiou N, Mihalopoulos N, Theodosi CN, Violaki K, Stathopoulou E, Scoullos M, Krom MD, Stockdale A, Shi Z, Berman-Frank I, Meador TB, Tanaka T and Paraskevi P (2016) The Potential Impact of Saharan Dust and Polluted Aerosols on Microbial Populations in the East(More)