Catalase activity in macro- and microorganisms as an indicator of biotic stress in coastal waters of the eastern Mediterranean Sea

1999 ◽  
Vol 53 (3-4) ◽  
pp. 209-218 ◽  
Author(s):  
N. Kress ◽  
D. Adelung ◽  
B. Herut ◽  
D. L. Angel ◽  
N. Eden ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Biotic Stress ◽  
Coastal Waters ◽  
Catalase Activity ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Sea

scholarly journals First occurrence of Scarus ghobban (Actinopterygii: Scaridae) in the coastal waters of Cyprus (Eastern Mediterranean Sea)

2010 ◽  
Vol 11 (2) ◽  
pp. 353 ◽  
Author(s):  
G. IOANNOU ◽  
N. MICHAILIDIS ◽  
A. LOUCAIDES ◽  
I. MANITARAS
Keyword(s):  
Mediterranean Sea ◽  
Coastal Waters ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Sea ◽  
First Occurrence ◽  
Scarus Ghobban

The first occurrence of the Indo-Pacific blue-barred parrotfish (Scarus ghobban) in the coastal waters of Cyprus is reported. The finding corroborates the establishment of this Lessepsian immigrant along the Levantine coasts.

scholarly journals Two-way bioinvasion: tracking the neritic non-native cyclopoid copepods Dioithona oculata and Oithona davisae (Oithonidae) in the Eastern Mediterranean Sea

2021 ◽  
Vol 22 (3) ◽  
pp. 586
Author(s):  
XIMENA VELASQUEZ ◽  
ARSENIY R. MOROV ◽  
TUBA TERBIYIK KURT ◽  
DALIT MERON ◽  
TAMAR GUY-HAIM
Keyword(s):  
Water Temperature ◽  
Mediterranean Sea ◽  
Coastal Waters ◽  
Eastern Mediterranean ◽  
Morphological Characteristics ◽  
Eastern Mediterranean Sea ◽  
Levantine Sea ◽  
Oithona Davisae ◽  
Introduced Range ◽  
Almost All

Accelerated anthropogenic changes in the Eastern Mediterranean Sea (EMS) have facilitated the introduction, spread and establishment of invasive copepod species in this region. Here, we report the introduction of two non-native cyclopoid copepods Dioithona oculata and Oithona davisae for the first time in the Israeli coastal waters and describe their temporal variability. The species were identified by morphological characteristics, DNA barcoding and phylogenetic inference. Molecular identification and phylogenetic analysis supported the taxonomical identification, nevertheless, showed cryptic speciation within D. oculata, separating the Western Pacific and EMS clades. In the Israeli coastal waters, D. oculata presented a temporally restricted occurrence, appearing from September 2019 to December 2019 (30.0±0.7 – 21.0±1.1 °C) and October 2020 (28.0±0.7 °C). The highest abundances of D. oculata occurred in the autumn (October 2019 and 2020), when the water temperature reached 28.0 °C (7 and 10 ind. m-3, respectively). The lowest abundance occurred in December 2019 (0.35 ind. m-3), when the water temperature decreased to 21.0 °C, indicating that the thermal affinity of D. oculata for warm-temperate conditions, for reproduction and the maintenance of viable populations, has persisted in the introduced range. In contrast, O. davisae appeared almost all year around (17.0±0.5 – 28.0±0.7 °C). This species demonstrated peaks in abundance both in October 2019 and October 2020, when the water temperature reached 28.0 °C (406 and 92 ind. m-3), as well as when the temperature decreased to 17.0 °C (31 ind. m-3, February 2020), confirming its wide eurythermal tolerance. Based on our findings and previous observations, we suggest that D. oculata may have invaded the EMS through the Suez Canal and is now at the onset of its spread in the Mediterranean Sea, whereas O. davisae has been introduced via shipping, likely from the Northeast Atlantic, widely spreading and successfully establishing viable populations across the entire Mediterranean Sea, until the coastal Levantine Sea.

scholarly journals Distribution Patterns of Floating Microplastics in Open and Coastal Waters of the Eastern Mediterranean Sea (Ionian, Aegean, and Levantine Seas)

2021 ◽  
Vol 8 ◽  
Author(s):  
Argyro Adamopoulou ◽  
Christina Zeri ◽  
Francesca Garaventa ◽  
Chiara Gambardella ◽  
Christos Ioakeimidis ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Coastal Waters ◽  
Spectroscopic Analysis ◽  
Eastern Mediterranean ◽  
Distribution Patterns ◽  
Sea Surface ◽  
Morphological Properties ◽  
Eastern Mediterranean Sea ◽  
Surface Circulation ◽  
Open Sea

Microplastic pollution is a pervasive anthropogenic phenomenon at the ocean surface. Numerous studies have been performed worldwide; nevertheless, the distribution patterns, morphological properties, and sources of origin in the Eastern Mediterranean Sea are still poorly explored. The purpose of this study is to investigate the distribution patterns of surface floating microplastics (MPs) in the Ionian, Aegean, and Levantine Seas in relation to their sources and sea surface circulation. In total, eighty-four samples were collected using manta nets from 2014 to 2020, covering open waters, coastal waters, and enclosed gulfs (Corfu and Saronikos). MPs concentration measurements revealed high variability ranging from 0.012 to 1.62 items m–2 and did not present maximum concentrations close to MPs hotspot areas. The presence of sea surface slicks, as recorded visually during our samplings, seems to play a key role on the distribution pattern of MPs, and highest concentrations were recorded in samples affected by these formations. The dominant MPs shape type identified were fragments (50–60%), whilst filaments (1–23%), films (3–26%), and foams (0–34%) varied among the studied areas. The majority of MPs in open waters had sizes ≤2 mm peaking between 0.6 and 1.4 mm. Spectroscopic analysis of MPs revealed the presence of 11 polymer types in both open sea and gulfs; the most abundant type was polyethylene (PE), followed by polypropylene (PP), and polystyrene (PS). The relative abundance of polymer types was more diverse in Saronikos Gulf, compared to the open sea due to the proximity to major urban and industrial sources. Our findings suggest that the vicinity to coastal population centers determined the properties, size and polymer types of MPs and highlight that MPs concentrations are affected significantly by local oceanographic conditions, such as surface slicks.

scholarly journals 210Po and 210Pb concentration in zooplankton of the Syrian coastal waters (eastern Mediterranean Sea)

2019 ◽  
Vol 20 (2) ◽  
pp. 320 ◽  
Author(s):  
MOHAMMAD SAID AL-MASRI ◽  
SAMER MAMISH ◽  
MOHAMMAD ABDEL-HALEEM ◽  
HANI HANI DURGHAM
Keyword(s):  
Mediterranean Sea ◽  
Coastal Waters ◽  
Concentration Ratio ◽  
Eastern Mediterranean ◽  
Reference Database ◽  
Eastern Mediterranean Sea ◽  
Marine Zooplankton ◽  
Activity Concentrations ◽  
210Pb Activity ◽  
Average Activity

210Po and 210Pb activity concentrations and their concentration ratio (CR) in marine zooplankton collected for the first time from the Syrian coastal waters (the eastern Mediterranean Sea) have been determined. The average activity concentrations of 210Po and 210Pb were 243±36 and 26.4±4.3 Bqkg-1 dw. The 210Po/210Pb activity ratio was found to be more than one  in all zooplankton samples with an average of 9.2 (8.4 to 10), which indicates that the accumulation of 210Po in zooplankton does not come from the decay of the 210Pb only, and reflects a preferential bioaccumulation of 210Po over 210Pb. In addition, the Concentration Ratio (CR) for 210Po and 210Pb reached 104 and 103, respectively. This study will contribute to the radioecological reference database for zooplankton in the Mediterranean Sea.

scholarly journals Penetration of coastal waters into the Eastern Mediterranean Sea using the SeaWiFS data

2002 ◽  
Vol 25 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Guenrik Karabashev ◽  
Marina Evdoshenko ◽  
Sergei Sheberstov
Keyword(s):  
Mediterranean Sea ◽  
Coastal Waters ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Sea

scholarly journals Comparison of Hydrocarbon-Degrading Consortia from Surface and Deep Waters of the Eastern Mediterranean Sea: Characterization and Degradation Potential

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2246
Author(s):  
Georgia Charalampous ◽  
Efsevia Fragkou ◽  
Konstantinos A. Kormas ◽  
Alexandre B. De Menezes ◽  
Paraskevi N. Polymenakou ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Oil Spills ◽  
Eastern Mediterranean ◽  
Sole Source ◽  
Eastern Mediterranean Sea ◽  
Deep Waters ◽  
Degradation Rates ◽  
Polycyclic Aromatic ◽  
Set Up

The diversity and degradation capacity of hydrocarbon-degrading consortia from surface and deep waters of the Eastern Mediterranean Sea were studied in time-series experiments. Microcosms were set up in ONR7a medium at in situ temperatures of 25 °C and 14 °C for the Surface and Deep consortia, respectively, and crude oil as the sole source of carbon. The Deep consortium was additionally investigated at 25 °C to allow the direct comparison of the degradation rates to the Surface consortium. In total, ~50% of the alkanes and ~15% of the polycyclic aromatic hydrocarbons were degraded in all treatments by Day 24. Approximately ~95% of the total biodegradation by the Deep consortium took place within 6 days regardless of temperature, whereas comparable levels of degradation were reached on Day 12 by the Surface consortium. Both consortia were dominated by well-known hydrocarbon-degrading taxa. Temperature played a significant role in shaping the Deep consortia communities with Pseudomonas and Pseudoalteromonas dominating at 25 °C and Alcanivorax at 14 °C. Overall, the Deep consortium showed a higher efficiency for hydrocarbon degradation within the first week following contamination, which is critical in the case of oil spills, and thus merits further investigation for its exploitation in bioremediation technologies tailored to the Eastern Mediterranean Sea.

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