scholarly journals Investigation on the genus Squalus in the Sardinian waters (Central-Western Mediterranean) with implications on its management

2018 ◽  
pp. 256 ◽  
Author(s):  
ANDREA BELLODI ◽  
CRISTINA PORCU ◽  
ALESSANDRO CAU ◽  
MARTINA FRANCESCA MARONGIU ◽  
RICCARDO MELIS ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Native Species ◽  
A Priori ◽  
Distinct Species ◽  
Western Mediterranean ◽  
Basal Plate ◽  
Dermal Denticle ◽  
High Level ◽  
Cap Analysis ◽  
Mtdna Marker

In the Mediterranean Sea, in addition to the two historically known species belonging to the Squalus genus, a third species, Squalus megalops, has been reported. Considering the high level of morphologic similarity of this species with the native species S. blainville, this study aims to evaluate the Central-Western Mediterranean spurdog population in order to test the hypothesis of the presence of two distinct species S. blainville and S. megalops. A total of 137 spurdogs, caught in the Sardinian waters, were analyzed morphologically and genetically after their subdivision into two groups depending on the number of the lateral processes in the chondrocranium basal plate. The CAP analysis, employing all body and chondrocranial measurements, revealed no clear segregation among the a priori assigned groups with a high misclassification percentage. Besides, no evident dissimilarities in teeth and dermal denticle morphology between the two groups were observed. All the 18 specimens which were genetically analyzed, by sequencing of the mtDNA marker COI, clustered together resulting to be S. blainville. All the obtained results indicated the presence, in the study area, of only one species, ascribable to S. blainville.

Further Additions to the Knowledge of the Reproduction of Zonaria pyrum insularum var. nigromarginata (Deprez & Govaert 2009) in the Atlantic and Western Mediterranean Coast of Spain

The Festivus ◽  
2018 ◽  
Vol 50 (3) ◽  
pp. 173-177
Author(s):  
Benito Muñoz Sánchez ◽  
José Muñoz Sánchez
Keyword(s):  
Mediterranean Sea ◽  
Native Species ◽  
Western Mediterranean ◽  
Mediterranean Coast ◽  
Strait Of Gibraltar ◽  
The Family ◽  
The Subject ◽  
The Mediterranean

The family Cypraeidae is represented in the Mediterranean Sea by four native species: Luria l. lurida; Naria s. spurca; Schilderia a. achatidea; and Zonaria p. pyrum. These species also inhabit the Atlantic coasts of Europe and Africa beyond the Strait of Gibraltar. Besides these, there are a few Lessepsian immigrants found occasionally throughout the central and eastern part of the Mare Nostrum including Naria turdus var. micheloi and Purpuradusta gracilis notata. This article focuses on the subspecies of Z. pyrum insularum (Schilder, 1928); var. nigromarginata (Deprez & Govaert, 2009), whose populations in the Atlantic have recently been the subject of numerous notes and comprehensive revisions (Goutal, 2008, Bergonzoni, 2013).

A new approach using biomarkers to elucidate the regression state of the invasive alga Caulerpa taxifolia in waters around the Balearic Islands (Western Mediterranean Sea)

2013 ◽  
Vol 64 (10) ◽  
pp. 986 ◽  
Author(s):  
Silvia Tejada ◽  
Antoni Sureda
Keyword(s):  
Lipid Peroxidation ◽  
Mediterranean Sea ◽  
Native Species ◽  
Western Mediterranean ◽  
Balearic Islands ◽  
Antioxidant Enzyme Activities ◽  
Caulerpa Taxifolia ◽  
Western Mediterranean Sea ◽  
And Function ◽  
Invasive Alga

Invasive algae alter the structure and function of ecosystems. The green alga Caulerpa taxifolia is an invasive alga introduced in the Mediterranean Sea, whereas Caulerpa prolifera is a native species in Mediterranean waters. The aim of the current work was to determine the oxidative status of both Caulerpa species by means of biomarker measures as a possible indicator of the regression state of C. taxifolia in waters around the Balearic Islands (western Mediterranean Sea). The levels of markers of lipid peroxidation, glutathione concentration, activities of antioxidant enzymes and caulerpenyne production were measured in C. prolifera and C. taxifolia fronds. The concentration of the end product of lipid peroxidation, malondialdehyde, was significantly higher in C. taxifolia than in C. prolifera samples. Antioxidant enzyme activities, namely superoxide dismutase glutathione peroxidase and glutathione reductase, as well as the reduced glutathione : glutathione disulfide ratio were lower in C. taxifolia than in C. prolifera, although the concentrations of malondialdehyde were higher in the alien species. No differences were found in catalase activity or in the concentration of caulerpenyne. In conclusion, the invasive alga C. taxifolia presented a more oxidised status, which could be related to its regression in Mallorcan coastal waters.

The genus Asterodinium (Dinophyceae) as a possible biological indicator of warming in the western Mediterranean Sea

2003 ◽  
Vol 83 (1) ◽  
pp. 173-174 ◽  
Author(s):  
Fernando Gómez ◽  
Hervé Claustre
Keyword(s):  
Mediterranean Sea ◽  
A Priori ◽  
Biological Indicator ◽  
Western Mediterranean ◽  
Tyrrhenian Sea ◽  
Ligurian Sea ◽  
Western Mediterranean Sea ◽  
First Time

The presence of two dinoflagellate species of the genus Asterodinium, which are a priori representative of warm waters, is reported for the first time in the western Mediterranean Sea. Asterodinium libanum was identified in the Bay of Villefranche-sur-Mer (Ligurian Sea), while Asterodinium gracile is reported in the Tyrrhenian Sea. These findings are discussed in the context of the progressive warming of Mediterranean waters.

scholarly journals Strategies for a Circular Economy in the Construction and Demolition Sector: Identifying the Factors Affecting the Recommendation of Recycled Concrete

2021 ◽  
Vol 13 (8) ◽  
pp. 4113
Author(s):  
Valeria Superti ◽  
Cynthia Houmani ◽  
Ralph Hansmann ◽  
Ivo Baur ◽  
Claudia R. Binder
Keyword(s):  
Circular Economy ◽  
A Priori ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Factors Affecting ◽  
Structural Applications ◽  
Adoption Of Innovation ◽  
Decision Making Processes ◽  
Behavioural Factors ◽  
High Level

With increasing urbanisation, new approaches such as the Circular Economy (CE) are needed to reduce resource consumption. In Switzerland, Construction & Demolition (C&D) waste accounts for the largest portion of waste (84%). Beyond limiting the depletion of primary resources, implementing recycling strategies for C&D waste (such as using recycled aggregates to produce recycled concrete (RC)), can also decrease the amount of landfilled C&D waste. The use of RC still faces adoption barriers. In this research, we examined the factors driving the adoption of recycled products for a CE in the C&D sector by focusing on RC for structural applications. We developed a behavioural framework to understand the determinants of architects’ decisions to recommend RC. We collected and analysed survey data from 727 respondents. The analyses focused on architects’ a priori beliefs about RC, behavioural factors affecting their recommendations of RC, and project-specific contextual factors that might play a role in the recommendation of RC. Our results show that the factors that mainly facilitate the recommendation of RC by architects are: a senior position, a high level of RC knowledge and of the Minergie label, beliefs about the reduced environmental impact of RC, as well as favourable prescriptive social norms expressed by clients and other architects. We emphasise the importance of a holistic theoretical framework in approaching decision-making processes related to the adoption of innovation, and the importance of the agency of each involved actor for a transition towards a circular construction sector.

scholarly journals Parasites of the head of Scomber colias (Osteichthyes: Scombridae) from the western Mediterranean Sea

2014 ◽  
Vol 59 (1) ◽  
Author(s):  
Salvatore Mele ◽  
Maria Pennino ◽  
Maria Piras ◽  
José Bellido ◽  
Giovanni Garippa ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Western Mediterranean ◽  
Parasite Fauna ◽  
Point Of View ◽  
Published Data ◽  
Multivariate Techniques ◽  
Western Mediterranean Sea ◽  
Scomber Colias ◽  
Non Parametric

AbstractThe metazoan parasite assemblage of the head of 30 specimens of the Atlantic chub mackerel (Scomber colias) from the western Mediterranean Sea was analysed. Eight species of parasites were found, four mazocraeid monogeneans: Grubea cochlear (prevalence = 10%), Kuhnia scombercolias (59%), K. scombri (52%), Pseudokuhnia minor (86%); three didymozoid trematodes: Nematobothrium cf. faciale (21%), N. filiforme (41%), N. scombri (7%); and one laerneopodid copepod: Clavelissa scombri (7%). Results were compared with previously published data from 14 localities of the eastern Mediterranean Sea and the Atlantic Ocean, using non-parametric univariate and multivariate analyses, and the whole parasite fauna of S. colias was compared with that of the congeners (S. australasicus, S. japonicus and S. scombrus). Parasites showed to reflect the biogeographical and phylogenetic history of host. From a methodological point of view, the use of both non-parametric univariate and multivariate techniques proved to be effective tools to detect dissimilarities between parasite assemblages.

scholarly journals Long Term Interactions of Native and Invasive Species in a Marine Protected Area Suggest Complex Cascading Effects Challenging Conservation Outcomes

Diversity ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 71
Author(s):  
Charalampos Dimitriadis ◽  
Ivoni Fournari-Konstantinidou ◽  
Laurent Sourbès ◽  
Drosos Koutsoubas ◽  
Stelios Katsanevakis
Keyword(s):  
Invasive Species ◽  
Native Species ◽  
High Performance ◽  
Marine Protected Area ◽  
Habitat Degradation ◽  
Population Increase ◽  
Rocky Reef ◽  
Cascading Effects ◽  
High Level

Understanding the interactions among invasive species, native species and marine protected areas (MPAs), and the long-term regime shifts in MPAs is receiving increased attention, since biological invasions can alter the structure and functioning of the protected ecosystems and challenge conservation efforts. Here we found evidence of marked modifications in the rocky reef associated biota in a Mediterranean MPA from 2009 to 2019 through visual census surveys, due to the presence of invasive species altering the structure of the ecosystem and triggering complex cascading effects on the long term. Low levels of the populations of native high-level predators were accompanied by the population increase and high performance of both native and invasive fish herbivores. Subsequently the overgrazing and habitat degradation resulted in cascading effects towards the diminishing of the native and invasive invertebrate grazers and omnivorous benthic species. Our study represents a good showcase of how invasive species can coexist or exclude native biota and at the same time regulate or out-compete other established invaders and native species.

A Two Phases Self-healing Framework for Service-oriented Systems

2021 ◽  
Vol 15 (2) ◽  
pp. 1-25
Author(s):  
Amal Alhosban ◽  
Zaki Malik ◽  
Khayyam Hashmi ◽  
Brahim Medjahed ◽  
Hassan Al-Ababneh
Keyword(s):  
Web Services ◽  
A Priori ◽  
Fault Management ◽  
Service Selection ◽  
Exception Handling ◽  
Self Healing ◽  
Service Oriented Architectures ◽  
Service Oriented ◽  
Improved Performance ◽  
High Level

Service-Oriented Architectures (SOA) enable the automatic creation of business applications from independently developed and deployed Web services. As Web services are inherently a priori unknown, how to deliver reliable Web services compositions is a significant and challenging problem. Services involved in an SOA often do not operate under a single processing environment and need to communicate using different protocols over a network. Under such conditions, designing a fault management system that is both efficient and extensible is a challenging task. In this article, we propose SFSS, a self-healing framework for SOA fault management. SFSS is predicting, identifying, and solving faults in SOAs. In SFSS, we identified a set of high-level exception handling strategies based on the QoS performances of different component services and the preferences articled by the service consumers. Multiple recovery plans are generated and evaluated according to the performance of the selected component services, and then we execute the best recovery plan. We assess the overall user dependence (i.e., the service is independent of other services) using the generated plan and the available invocation information of the component services. Due to the experiment results, the given technique enhances the service selection quality by choosing the services that have the highest score and betters the overall system performance. The experiment results indicate the applicability of SFSS and show improved performance in comparison to similar approaches.

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