scholarly journals Co-occurrence of a reef-building coral and canopy-forming macroalgae in the Mediterranean Sea

2021 ◽  
Author(s):  
ALÈSSIA PONS-FITA ◽  
DIEGO K. KERSTING ◽  
ENRIC BALLESTEROS
Keyword(s):  
Mediterranean Sea ◽  
Small Scale ◽  
Case Scenario ◽  
Worst Case ◽  
Future Studies ◽  
Cladocora Caespitosa ◽  
New Information ◽  
Starting Point ◽  
The Mediterranean ◽  
The Relationship

Canopy-forming macroalgae are amongst the main competitors of corals by affecting coral recruitment, growth of recruits and adults, fecundity and in the worst-case scenario causing coral bleaching and necrosis. However, potentially reef-building coral Cladocora caespitosa (Linnaeus, 1767) and canopy-forming macroalgae of the order Fucales (Cystoseira sensu lato) are known to concur in a few places of the Mediterranean Sea. Here we look at the small-scale relationships between Cladocora abundance and Cystoseira s. l. densities at three different places where they coexist. Relationships have turned out to be both species and site-specific even though most relationships are neutral, pointing to a predominant concurrence of corals and macroalgae at the small scale. These findings shed new information on the relationship between corals and fleshy macroalgae in a temperate environment and serve as a starting point for future studies addressing the interactions between C. caespitosa and Cystoseira s. l.

scholarly journals Characterization of the Atlantic Water and Levantine Intermediate Water in the Mediterranean Sea using Argo Float Data

2021 ◽  
Author(s):  
Giusy Fedele ◽  
Elena Mauri ◽  
Giulio Notarstefano ◽  
Pierre Marie Poulain
Keyword(s):  
Mediterranean Sea ◽  
Thermohaline Circulation ◽  
Internal Variability ◽  
Warming Trend ◽  
Atlantic Water ◽  
Western Mediterranean ◽  
Water Masses ◽  
Intermediate Water ◽  
Starting Point ◽  
The Mediterranean

Abstract. The Atlantic Water (AW) and Levantine Intermediate Water (LIW) are important water masses that play a crucial role in the internal variability of the Mediterranean thermohaline circulation. In particular, their variability and interaction, along with other water masses that characterize the Mediterranean basin, such as the Western Mediterranean Deep Water (WMDW), contribute to modify the Mediterranean Outflow through the Gibraltar Strait and hence may influence the stability of the global thermohaline circulation. This work aims to characterize the AW and LIW in the Mediterranean Sea, taking advantage of the large observational dataset provided by Argo floats from 2001 to 2019. Using different diagnostics, the AW and LIW were identified, highlighting the inter-basin variability and the strong zonal gradient that characterize the two water masses in this marginal sea. Their temporal variability was also investigated focusing on trends and spectral features which constitute an important starting point to understand the mechanisms that are behind their variability. A clear salinification and warming trend have characterized the AW and LIW in the last two decades (~0.007 and 0.008 yr−1; 0.018 and 0.007 °C yr−1, respectively). The salinity and temperature trends found at subbasin scale are in good agreement with previous results. The strongest trends are found in the Adriatic basin in both the AW and LIW properties. A subbasin dependent spectral variability emerges in the AW and LIW salinity timeseries with peaks between 2 and 10 years.

Crafts Traders versus the State

2017 ◽  
Author(s):  
Dillon Mahoney
Keyword(s):  
Local Governments ◽  
New Technologies ◽  
The State ◽  
Small Scale ◽  
British Colonialism ◽  
Starting Point ◽  
Diverse Backgrounds ◽  
Before And After ◽  
History Of ◽  
The Relationship

This chapter traces the development of Kenya’s tourism and handicraft industries from their roots in 20th century British colonialism to provide some of the broader history of Kenya’s tourism and co-operative development, their emergence in Mombasa, and their relationships with local governments. I draw on archival as well as ethnographic data collected just before the 2002 demolition of Mombasa’s roadside kiosks, which form the starting point for the larger longitudinal study. I focus on the array of experiences of Mombasa’s roadside traders of diverse backgrounds as they struggle with the privatization and segregation of urban residential and commercial space both before and after the demolitions. The economy was radically altered as the roadsides were “cleaned” and a new wave of economic formalization characterized the relationship between small-scale businesspeople and the state. For many entrepreneurs invested in the global crafts trade, this was the final straw that pushed them toward new technologies, jumping scales into global markets, and investing in export and wholesale businesses that were not spatially dependent upon a connection to the city center.

scholarly journals Social equity and marine protected areas: Perceptions of small-scale fishermen in the Mediterranean Sea

2020 ◽  
Vol 244 ◽  
pp. 108531 ◽  
Author(s):  
Nathan J. Bennett ◽  
Antonio Calò ◽  
Antonio Di Franco ◽  
Federico Niccolini ◽  
Daniela Marzo ◽  
...  
Keyword(s):  
Protected Areas ◽  
Mediterranean Sea ◽  
Marine Protected Areas ◽  
Social Equity ◽  
Small Scale ◽  
The Mediterranean

scholarly journals Sinking microplastics in the water column: simulations in the Mediterranean Sea

Ocean Science ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 431-453
Author(s):  
Rebeca de la Fuente ◽  
Gábor Drótos ◽  
Emilio Hernández-García ◽  
Cristóbal López ◽  
Erik van Sebille
Keyword(s):  
Vertical Distribution ◽  
Mediterranean Sea ◽  
Water Column ◽  
Large Scale ◽  
Circulation Model ◽  
Small Scale ◽  
The Mediterranean ◽  
Scale Turbulence ◽  
Non Gaussian ◽  
The Vertical Distribution

Abstract. We study the vertical dispersion and distribution of negatively buoyant rigid microplastics within a realistic circulation model of the Mediterranean sea. We first propose an equation describing their idealized dynamics. In that framework, we evaluate the importance of some relevant physical effects (inertia, Coriolis force, small-scale turbulence and variable seawater density), and we bound the relative error of simplifying the dynamics to a constant sinking velocity added to a large-scale velocity field. We then calculate the amount and vertical distribution of microplastic particles on the water column of the open ocean if their release from the sea surface is continuous at rates compatible with observations in the Mediterranean. The vertical distribution is found to be almost uniform with depth for the majority of our parameter range. Transient distributions from flash releases reveal a non-Gaussian character of the dispersion and various diffusion laws, both normal and anomalous. The origin of these behaviors is explored in terms of horizontal and vertical flow organization.

scholarly journals Cycling along a River: New Access, New Values?

2020 ◽  
Vol 12 (22) ◽  
pp. 9311
Author(s):  
Matthieu Adam ◽  
Marylise Cottet ◽  
Sylvie Morardet ◽  
Lise Vaudor ◽  
Laure Coussout ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Local Population ◽  
The Other ◽  
Local People ◽  
Natural Environments ◽  
Lake Geneva ◽  
Other Hand ◽  
Preservation And Restoration ◽  
The Mediterranean ◽  
The Relationship

The ViaRhôna is an 815 km cycle route running along the Rhône River from Lake Geneva to the Mediterranean Sea. We examine the influence of this type of cycle route on the relationship between route users (including the local population, itinerant cyclists and foreign tourists) and the river landscapes. This relationship is approached from the angle of the use of the riverbanks as well as the perceived image, the value, and the knowledge associated with the river and its landscapes. Our survey based on interviews (n = 16) and questionnaires (n = 546) produced the following results. The features of the cycle route and the related activities that it makes possible drain a special segment of the population that, in spite of its diverse sociological composition, shares similar tastes. The creation of the cycle route has led to an increase in use of the riverbanks both by tourists and local people. The experience that it offers contributes to enhancing the value that users place on the river. This is due to a change in the image of the river following the (re)discovery of its natural environments. On the other hand, knowledge of one’s natural environments is not modified. These results raise the question of possible changes in the degree to which users support policies targeting the preservation and restoration of the river.

How many grains do we need for tracer thermochronology?

2020 ◽  
Author(s):  
Andrea Madella ◽  
Christoph Glotzbach ◽  
Todd A. Ehlers
Keyword(s):  
Sample Size ◽  
Confidence Level ◽  
Age Distribution ◽  
Cumulative Distribution ◽  
Limited Sample ◽  
Case Scenario ◽  
Worst Case ◽  
Tenfold Increase ◽  
The Impact ◽  
The Relationship

<p>Detrital tracer thermochronology exploits the relationship between bedrock cooling age and elevation, whereby detrital cooling age distributions can inform the pattern of erosion in the upstream area. Typically bedrock ages exhibit a positive relation with elevation, since the exhumation path from the closure isotherm to the surface is longer. Therefore, spatially uniform erosion should yield a detrital cooling age distribution that mirrors the catchment’s hypsometric curve, corrected for mineral fertility. Applying thermochronometers is time consuming and expensive, hence measured detrital age populations have a limited sample size (rarely exceeding 100 grains) and only provide an approximation of the natural continuous detrital age distribution. With such limited sample sizes, discerning between two detrital age distributions resulting from different erosional patterns may be statistically impossible at a high confidence level.</p><p>Here, we investigate the impact of sample size on the detrital cooling age distributions and the resulting uncertainty in addressing the erosional pattern of the upstream area. To do so, we forward model a continuous detrital age distribution as a function given parameters, such as catchment hypsometry, mineral fertility, exhumation rate, analytical uncertainty and erosion scenario. A random subsample of the entire detrital population is drawn for each possible sample size, from which an approximate cumulative distribution function (CDF) is calculated. Then we compute the divergence of the approximate CDF from the reference continuous CDF as well as from the continuous CDF obtained for a different erosion scenario. The confidence level at which an approximate CDF can be tied to a specific erosion scenario is iteratively estimated for each sample size. We carry out the outlined approach for a synthetic catchment with elevations ranging between 0.5-2.2 km, where bedrock cooling ages increase by 30 My/km and prescribing a 10% standard deviation for single grain ages.</p><p>We find that, if the location of the erosion maximum coincides with the peak of the hypsometric curve, 100 grains do not suffice to resolve a local tenfold increase in erosion at the 95% confidence level. In this worst case scenario 240 grains would be required. However, for the same case, 70 grains are enough at the 68% confidence level. This study provides a method to consistently quantify the uncertainty of detrital tracer thermochronology as a function of sample size, case-specific variables and the initial scientific question.</p>

scholarly journals Occurrence and reduction of F-specific RNA bacteriophage genotypes as indicators of human norovirus at a wastewater treatment plant

2018 ◽  
Vol 17 (1) ◽  
pp. 50-62 ◽  
Author(s):  
Suntae Lee ◽  
Mamoru Suwa ◽  
Hiroyuki Shigemura
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Case Scenario ◽  
Worst Case ◽  
Mean Values ◽  
Treatment Facilities ◽  
The Mean ◽  
Human Enteric Viruses ◽  
The Relationship

Abstract F-specific RNA bacteriophages (FRNAPHs) have been suggested as good indicators of the presence of human enteric viruses in water treatment facilities. The occurrence and reduction of norovirus (NoV) and FRNAPH genotypes in wastewater treatment plants (WWTPs) have been well studied; however, the relationship between these genotypes in WWTPs has not been fully elucidated. Thus, we aimed to investigate the occurrence and reduction of FRNAPH genotypes in an attempt to identify NoV indicators in a WWTP via a 1-year survey. All FRNAPH and NoV genotypes were detected in WWTP influents at high rates (71–100%), including the infectious FRNAPH genotype IV (GIV), which has been rarely detected in previous studies. The reductions of FRNAPH GII and NoV GII during wastewater treatment indicated a relationship between the two (r = 0.69, P < 0.01), and the mean values were not significantly different. These results suggested that FRNAPH GII could be used as an appropriate indicator of NoV GII during wastewater treatment. FRNAPH GI was also found to be an appropriate indicator of viral reduction because of its high resistance to wastewater treatment compared with the other FRNAPH and NoV genotypes; therefore, it can be considered as a worst-case scenario organism.

scholarly journals Pre-operational short-term forecasts for the Mediterranean Sea biogeochemistry

2009 ◽  
Vol 6 (2) ◽  
pp. 1223-1259 ◽  
Author(s):  
P. Lazzari ◽  
A. Teruzzi ◽  
S. Salon ◽  
S. Campagna ◽  
C. Calonaci ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Coupled Model ◽  
Biogeochemical Model ◽  
Short Term ◽  
Future Studies ◽  
Successful Execution ◽  
Fundamental Research ◽  
Fully Automatic ◽  
The Mediterranean ◽  
Assimilation Scheme

Abstract. Operational prediction of the marine environment is recognised as a fundamental research issue for Europe. We present a pre-operational implementation of a biogeochemical model for pelagic waters of the Mediterranean Sea, as developed within the framework of the MERSEA-IP European project. The OPATM-BFM coupled model is the core of a fully automatic system that weekly delivers analysis and forecast maps for the Mediterranean Sea biogeochemistry. The system in the present configuration has been working since April 2007 with successful execution of the fully automatic operational chain in the 87% of the cases, and in the remaining cases the runs were successfully accomplished after operator intervention. A description of the system developed and a comparison of the model results with satellite data are also presented, with Spearman correlation on surface chlorophyll temporal evolution equal to 0.71. Future studies will be addressed to the implementations of a data assimilation scheme for the biogeochemical compartment in order to increase the skill of the model performances.

scholarly journals EXPOSURE TO WORKPLACE BULLYING AND SUICIDAL IDEATION: AN EXPLORATORY STUDY

2019 ◽  
Vol 3 (1) ◽  
pp. 55-75
Author(s):  
Ernesto Rosario- Hernández ◽  
Lillian V. Rovira Millán ◽  
Stephanie Vega Vélez ◽  
Rosael Zeno- Santi ◽  
Pamela Farinacci García ◽  
...  
Keyword(s):  
Suicidal Ideation ◽  
Workplace Bullying ◽  
Theoretical Models ◽  
Case Scenario ◽  
Cross Sectional ◽  
Worst Case ◽  
Effective Manner ◽  
Cross Sectional Design ◽  
The Impact ◽  
The Relationship

There is evidence of the effects of exposure to workplace bullying on victims who may manifest symptoms of depression, anxiety, burnout, somatization, sleep difficulties, and posttraumatic stress; however, few studies have examined the impact of workplace bullying on suicidal ideation. The purpose of the present study was to examine the relationship between exposure to workplace bullying and suicidal ideation and how feelings of defeat and entrapment mediate this relationship. Also, it was intended to examine how rumination moderates this relationship. As a framework, it was used the Integrated Motivational-Volitional Model of Suicide Behavior (IMV) in which has been integrated several theoretical models of suicide. A total of 898 employed subjects participated in this cross-sectional design study. To examine the hypotheses, PLS-SEM model was used using the SMART-PLS program. Exposure to workplace bullying,defeat and entrapment were positively and significantly related to suicidal ideation. Meanwhile,feelings of defeat and entrapment mediated the relationship between exposure to workplace bullying and suicidal ideation and rumination moderated the relation between exposure to workplace bullying and feelings defeat. The results of the present study have both theoretical and practical implications, among which we can mention that results support and expand the IMV model of suicidal behavior. The exposure to workplace bullying brings a challenge for the psychologists in the occupational health context, and human resources practitioners in the management of this phenomenon in organizations to prevent it and in a worst case scenario, to respond in an effective manner due to its individual and organizational impact.

scholarly journals The shifting distribution of Mediterranean fishes: a spatio-temporal assessment based on Local Ecological Knowledge .

2019 ◽  
Author(s):  
Ernesto Azzurro ◽  
Valerio Sbragaglia ◽  
Jacopo Cerri ◽  
Michel Bariche ◽  
Luca Bolognini ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Temporal Dynamics ◽  
Local Ecological Knowledge ◽  
Rapid Change ◽  
Species Abundance ◽  
Global Ocean ◽  
Small Scale ◽  
Ecological Knowledge ◽  
The Mediterranean ◽  
Spatio Temporal

A major problem worldwide is the rapid change in species abundance and distribution, which is rapidly restructuring the biological communities of many ecosystems under changing climates. Tracking these transformations in the marine environment is crucial but our understanding is often hampered by the absence of historical data and by the practical challenge of survey large geographical areas. Here we focus on the Mediterranean Sea, a region which is warming faster than the rest of the global ocean, tracing back the spatio-temporal dynamic of species, which are emerging the most in terms of increasing abundances and expanding distributions. To this aim, we accessed the Local Ecological Knowledge (LEK) of small-scale and recreational fishers reconstructing the dynamics of fish perceived as ‘new’ or increasing in different fishing area. Over 500 fishers across 95 locations and 9 different countries were interviewed and semi-quantitative information on yearly changes in species abundance was collected. Overall, 75 species were mentioned by the respondents, being the most frequent citations related to warm-adapted species of both, native and exotic origin. Respondents belonging to the same biogeographic sectors described coherent spatio-temporal dynamics, and gradients along latitudinal and longitudinal axes were revealed. This information provides a more complete understanding of recent bio-geographical changes in the Mediterranean Sea and it also demonstrates that adequately structured LEK methodology might be applied successfully beyond the local scale, across national borders and jurisdictions. Acknowledging this potential through macro-regional coordination, could pave the ground for future large-scale aggregations of individual observations, increasing our potential for integrated monitoring and conservation planning at the regional or even global level.

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