Bahartan K.,Tel Aviv University |
Zibdah M.,Marine Science Station |
Ahmed Y.,Marine Science Station |
Israel A.,Israel Oceanographic And Limnological Research |
And 2 more authors.
Marine Pollution Bulletin | Year: 2010
The current state of health of the coral reefs in the northern Gulf of Aqaba (Red Sea), notably the Eilat reefs, is under debate regarding both their exact condition and the causes of degradation. A dearth of earlier data and unequivocal reliable indices are the major problems hinder a clear understanding of the reef state. Our research objective was to examine coral-algal dynamics as a potential cause and an indication of reef degradation. The community structure of stony corals and algae along the northern Gulf of Aqaba reveal non-seasonal turf algae dominancy in the shallow Eilat reefs (up to 72%), while the proximate Aqaba reefs present negligible turf cover (<6%). We believe that turf dominancy can indicate degradation in these reefs, based on the reduction in essential reef components followed by proliferation of perennial turf algae. Our findings provide further evidence for the severe state of the Eilat coral reefs. © 2009 Elsevier Ltd.
Duris Z.,University of Ostrava |
Horka I.,University of Ostrava |
Horka I.,Charles University |
Al-Horani F.,Marine Science Station |
Al-Horani F.,University of Jordan
Zootaxa | Year: 2011
A new species of sponge-associated pontoniine shrimp from the northeastern Red Sea is described and illustrated. The new species is closely related to Periclimenaeus rhodope, but can be easily distinguished from the latter by the dense spinulation of the second pereiopod chelae. The new species is placed in the Periclimenaeus robustus species group, on account of the presence of the anterodorsal median lobe on the first abdominal segment. The new species is the first representative of the genus reported from a discrete Red Sea locality. Copyright © 2011 • Magnolia Press.
Laiolo L.,University of Bologna |
Barausse A.,University of Padua |
Dubinsky Z.,Bar - Ilan University |
Palmeri L.,University of Padua |
And 4 more authors.
Marine Pollution Bulletin | Year: 2014
The northern Gulf of Aqaba is an oligotrophic water body hosting valuable coral reefs. In the Gulf, phytoplankton dynamics are driven by an annual cycle of stratification and mixing. Superimposed on that fairly regular pattern was the establishment of a shallow-water fish-farm initiative that increased gradually until its activity was terminated in June 2008. Nutrient, water temperature, irradiation, phytoplankton data gathered in the area during the years 2007-2009, covering the peak of the fish-farm activity and its cessation, were analyzed by means of statistical analyses and ecological models of phytoplankton dynamics. Two datasets, one from an open water station and one next to the fish farms, were used. Results show that nutrient concentrations and, consequently, phytoplankton abundance and seasonal succession were radically altered by the pollution originating from the fish-farm in the sampling station closer to it, and also that the fish-farm might even have influenced the open water station. © 2014 Elsevier Ltd.
Ababneh Z.Q.,Yarmouk University |
Al-Omari H.,Yarmouk University |
Rasheed M.,Marine Science Station |
Al-Najjar T.,Marine Science Station |
Ababneh A.M.,Yarmouk University
Radiation Protection Dosimetry | Year: 2010
The Gulf of Aqaba is the only seaport in Jordan which currently has intense activities such as industrial development, phosphate ore exportation, oil importation, shipping, commercial and sport fishing. Most of these activities, especially the phosphate ore exportation, could cause serious radiological effects to the marine environment. Thus, it is essential to investigate the level of the radioactivity concentrations to establish a baseline database, which is not available yet in the Gulf of Aqaba. Radioactivity concentrations of gamma-emitting radionuclides in core and beach sediments of the Gulf of Aqaba were investigated. Core sediments were collected from five representative locations for three different water column depths (5, 15 and 35 m). The results showed that the activity concentrations of 238U, 235U and 226Ra for both seafloor and beach sediments from the phosphate loading berth (PLB) location to be higher than those from other investigated locations and more than twice as high as the worldwide average; the 238U activity concentration was found to vary from 57 to 677 Bq kg-1. The results also showed that there is little variation of radioactivity concentrations within the core length of 15 cm. The calculated mean values of the radium equivalent activity Raeq, the external hazard index, Hex, the absorbed dose rate and the annual effective dose for the beach sediment in PLB location were 626 Bq kg-1, 1.69, 263 nGy h-1 and 614 μSv y-1, respectively. These values are much higher than the recommended limits that impose potential health risks to the workers in this location. As for other studied locations, the corresponding values were far below the maximum recommended limit and lies within the worldwide range. © The Author 2010. Published by Oxford University Press. All rights reserved.