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Dense intermediate water outflow from the Cretan Sea: 1. A salinity-driven, recurrent phenomenon, connected to thermohaline circulation changes

July 30, 2014

Data collected from different platforms in the Cretan Sea during the 2000’s decade present evidence of gradually increasing salinity in the intermediate and deep intermediate layers after the middle of the decade. The observed gradual salt transport towards the deeper layers indicates contributions of dense water masses formed in various Aegean Sea sub-basins. The accumulation of these saline and dense water masses in the Cretan Sea finally led to outflow from both Read more…

Clues from the recent past to assess recruitment of Mediterranean small pelagic fishes under sea warming scenarios

July 30, 2014

Knowledge of the effect of environmental variables on the early life history of fishes is essential to assess the effect of future environmental changes on the recruitment of commercial species. We investigate the effect of sea warming on two small pelagic fishes (Engraulis encrasicolus andSardinella aurita) in the NW Mediterranean Sea based on the analysis of ichthyoplankton data collected in two surveys of contrasting conditions: the exceptionally warm summer of 2003, Read more…

Application of a toxicity test battery integrated index for a first screening of the ecotoxicological threat posed by ports and harbors in the southern Adriatic Sea (Italy)

July 29, 2014

Ports and harbors may represent a threat for coastal ecosystems due to pollutant inputs, especially those derived from maritime activities. In this study, we report a first assessment of the ecotoxicological threat posed by six ports and harbors of opposite coastal regions, Apulia and Albania, in the southern Adriatic Sea (Italy). A bioassay battery consisting of four different species representing different trophic levels, algae Dunaliella tertiolecta, bacteria Vibrio Read more…

Annual hypoxia dynamics in a semi-enclosed Mediterranean gulf

July 29, 2014

In this paper we study the hypoxia dynamics in a fjord-like gulf, the Amvrakikos Gulf, in the Mediterranean Sea and highlight the factors which control the development of hypoxia. Bimonthly physicochemical data were collected in order to describe the hypoxic conditions and a three-dimensional model was used to describe the hydrodynamic circulation and explain the variations in hypoxic conditions. According to our results, the horizontal intrusion of well oxygenated Read more…

Age composition of the European hake Merluccius merluccius, Linnaeus, 1758 from the Egyptian Mediterranean waters off Alexandria

July 29, 2014

Data for age, growth and mortality were analyzed for Merluccius merluccius collected by trawling from the Egyptian Mediterranean waters off Alexandria during the period from March 2009 to February 2011. Total length ranged between 14 and 43 cm. The age was estimated by otolith radius and it was found that the maximum age was 4 years for males and 6 years for females. The von Bertalanffy growth parameters for males were L = 58.97 cm, K = 0.158 yr−1, t0 = 0.235 yr Read more…

Towards a suitable ecological status assessment of highly stratified mediterranean estuaries: A comparison of benthic invertebrate fauna indices

July 29, 2014

Biotic indices developed to assess the ecological status of coastal waters according to the European Water Framework Directive (WFD) often show discrepancies when they are applied in transitional environments. Although several indices have been widely used in transitional waters throughout Europe, there is still a lack of knowledge about their suitability assessing ecological status. We evaluated the performance of most common used biotic indices and community Read more…

The Clodia database: a long time series of fishery data from the Adriatic Sea

July 29, 2014

Long-term time series of species abundances can depict population declines and changes in communities in response to anthropogenic activities, climate changes, alterations of trophic relationships. Here we present a database of historical marine fishery landing data, covering a remarkably long time series (1945–2013) and referring to one of the most exploited areas of the Mediterranean Sea, the Adriatic Sea. The database includes two time series of landing data, 1945– Read more…

The carbon budget in the northern Adriatic Sea, a winter case study

July 28, 2014

This paper presents a winter carbon budget for the northern Adriatic Sea, obtained through direct measurements during two multidisciplinary cruises and literature data. A box model approach was adopted to integrate estimates of stocks and fluxes of carbon species over the total area. The oligotrophy at the basin scale and the start of primary productivity well before the onset of spring stratification were observed. In winter, the system underwent a complete reset, as the mixing Read more…

The Alarming Decline of Mediterranean Fish Stocks

July 28, 2014

In recent years, fisheries management has succeeded in stabilizing and even improving the state of many global fisheries resources [1, 2, 3, 4 and 5]. This is particularly evident in areas where stocks are exploited in compliance with scientific advice and strong institutional structures are in place [1 and 5]. In Europe, the well-managed northeast (NE) Atlantic fish stocks have been recovering in response to decreasing fishing pressure over the past decade [3, 4, 5 and 6], albeit with Read more…

Recent benthic foraminiferal assemblages and their relationship to environmental variables on the shoreface and inner shelf off Valencia (Western Mediterranean)

July 28, 2014

The environmental variables that determine the distributions of benthic foraminiferal assemblages on the shoreface and inner shelf of the north of Valencia province (Western Mediterranean) are identified. The possible influence of variables such as water depth, distance from shore, hydrodynamics, substrate type, carbonate content, organic matter content and human activity is evaluated. Multivariate cluster-Q-type analysis and redundancy analysis (RDA) are used to identify the environmental variables that have the greatest influence on the assemblage distribution. Read more…