scholarly journals Climate tolerances of Philaenus spumarius should be considered in risk assessment of disease outbreaks related to Xylella fastidiosa

2021 ◽  
Author(s):  
M. Godefroid ◽  
M. Morente ◽  
T. Schartel ◽  
D. Cornara ◽  
A. Purcell ◽  
...  
Keyword(s):  
Mediterranean Basin ◽  
Western Europe ◽  
Xylella Fastidiosa ◽  
Disease Outbreaks ◽  
Mediterranean Area ◽  
Plant Diseases ◽  
Distribution Models ◽  
Philaenus Spumarius ◽  
Southern Mediterranean ◽  
The Mediterranean

AbstractThe bacterium Xylella fastidiosa (Xf) is an invasive insect-borne pathogen, which causes lethal diseases to important crops including olives, citrus, almonds and grapes as well as numerous forest, ornamental, and uncultivated plants. Outbreaks of Xf-related plant diseases are currently occurring in the Mediterranean region, causing substantial losses to various agricultural sectors. Several models have recently been published to identify which regions are at highest risk in Europe; however, such models did not consider the insect vectors, which constitute the key driver of short-range Xf spread. We fitted bioclimatic species distribution models to depict the macroclimatic preferences of the meadow spittlebug Philaenus spumarius L. (1978) (Hemiptera: Aphrophoridae), the major epidemiologically relevant vector currently responsible for Xf spread in the Europe. Many regions of Western Europe and Mediterranean basin are predicted by models as highly climatically suitable for this vector, including all regions where severe Xf have occurred so far. Conversely, the driest and warmest areas of the Mediterranean basin are predicted as little suitable for P. spumarius. Models forecast that agricultural-important parts of the southern Mediterranean area might experience a substantial decrease in climatic suitability for P. spumarius by the period 2040–2060. Areas predicted as highly suitable just for the bacterium but not optimal for this vector are apparently still free of severe Xf outbreaks, suggesting that climate tolerances of P. spumarius might partly explain the current spatial pattern of Xf outbreaks in Europe and should always be considered in further risk assessments.

scholarly journals The risk of Xylella fastidiosa outbreaks will decrease in the Mediterranean olive-producing regions

2020 ◽  
Author(s):  
M. Godefroid ◽  
M. Morente ◽  
T. Schartel ◽  
D. Cornara ◽  
A. Purcell ◽  
...  
Keyword(s):  
Xylella Fastidiosa ◽  
Mediterranean Area ◽  
Main Role ◽  
Vector Species ◽  
Distribution Models ◽  
Vector Borne Diseases ◽  
Important Practical Application ◽  
Climate Suitability ◽  
Vector Borne ◽  
The Mediterranean

AbstractThe bacterium Xylella fastidiosa (Xf) is a worldwide distributed invasive insect-borne plant pathogen, which causes lethal diseases to many economically-important crops including olives, citrus, almonds and grapes as well as numerous forest, ornamental, and uncultivated plants. The Mediterranean basin is the top supplier of olive oil with 93% of the world production and is consequently highly concerned about the recent invasion of Xf in Europe. Recently, bioeconomic models estimated putative losses induced by the spread of Xf across the European olive-producing area ranging from 1.9 to 5.2 billion euros over 50 years; however, such models did not take into account the insect vectors, which constitute a key driver of Xf spread. In the present study, we used bioclimatic species distribution models to predict the current and future climate suitability of the Mediterranean area for the main efficient or putative transmitters of Xf to olive (i.e. Philaenus spumarius, Neophilaenus campestris and Aphrophora alni). An important part of the total extent of the Mediterranean olive-producing area, mainly situated in southern Spain, Turkey and Greece, is predicted as currently poorly suitable for these vector species. Moreover, models forecast that nearly the totality of the Mediterranean olive-producing regions will likely become climatically little suitable for these vectors by 2050 due to climate change. In Europe, Xf outbreaks have occurred so far only in localities predicted as climatically suitable for these main vector species (e.g. the Apulia region of Italy) while the areas predicted as poorly suitable are still apparently Xf-free, which suggests that climate tolerances of vectors might play a main role in shaping Xf outbreaks patterns. This pattern highlights the crucial necessity of accounting for vectors when assessing risk of Xf outbreaks, and when considering vector-borne diseases in general. The risk maps presented here will have important practical application for the optimization of current and future strategies to control Xf in the Mediterranean region.

scholarly journals A modelling study of photochemical regimes over Europe: robustness and variability

2009 ◽  
Vol 9 (1) ◽  
pp. 1521-1560 ◽  
Author(s):  
M. Beekmann ◽  
R. Vautard
Keyword(s):  
Model Uncertainty ◽  
Mediterranean Basin ◽  
Western Europe ◽  
Regional Scale ◽  
Relative Sensitivity ◽  
Time Variability ◽  
Nox Emissions ◽  
The Mediterranean ◽  
North Western ◽  
The Mediterranean Basin

Abstract. The variability of the relative sensitivity to volatile organic compounds (VOC) or NOx emissions, the chemical regime, over Europe during summers 2001 to 2003 is simulated with a regional scale transport-chemistry model. The robustness of chemical regimes is shown. A VOC sensitive regime over North-Western Europe and a mainly NOx sensitive regime over the Mediterranean basin and Eastern Europe are found, confirming earlier published results. The chemical regime time variability, its robustness to several environmental factors (seasonality, interannual variability) and to model uncertainty are thoroughly analysed. The chemical regime spatial structure only slightly depends on the ozone target considered (daily ozone maximum or AOT40, SOMO35, ...). Differences between particular years and summer months are weak. Day to day variability is significant but does not change the occurrence of one or another chemical regime over North-Western Europe and the Mediterranean basin. Expected decreases in anthropogenic NOx emissions over Europe since the last and for the next few decades have shifted and will shift chemical regimes to more NOx sensitive. The predictive and explanatory use of chemical regime indicator species is also investigated. For all cases but near ship tracks over the Mediterranean basin, the spatial pattern of chemical regimes appears to be robust with respect to model uncertainty.

scholarly journals African dust outbreaks over the Mediterranean Basin during 2001–2011: PM<sub>10</sub> concentrations, phenomenology and trends, and its relation with synoptic and mesoscale meteorology

2012 ◽  
Vol 12 (10) ◽  
pp. 28195-28235 ◽  
Author(s):  
J. Pey ◽  
X. Querol ◽  
A. Alastuey ◽  
F. Forastiere ◽  
M. Stafoggia
Keyword(s):  
Mediterranean Basin ◽  
Mediterranean Area ◽  
Moderate Intensity ◽  
Sharp Change ◽  
Central Mediterranean ◽  
Mesoscale Meteorology ◽  
Transitional Area ◽  
African Dust ◽  
The Mediterranean ◽  
The Impact

Abstract. The occurrence of African dust outbreaks over the whole Mediterranean Basin has been identified on an 11-yr period (2001–2011). In order to evaluate the impact of such mineral dust outbreaks on ambient concentrations of particulate matter, PM10 data from regional and suburban background sites across the Mediterranean area were compiled. After identifying the daily influence of African dust, a methodology for estimating natural dust contributions on daily PM10 concentrations was applied. Our results reveal that African dust outbreaks occur with much higher frequency in southern areas of the Mediterranean, from 30 to 37% of the annual days, whereas they take place less than 20% of the annual days in northern sites. The central Mediterranean emerges as a transitional area, with slightly higher frequency of dust episodes in its lower extreme when compared to equivalent areas in western and eastern sides of the Basin. A decreasing south to north gradient of African dust contribution to PM10 is patent across the Mediterranean. Our study demonstrates that this gradient may be mainly explained by the latitudinal position. A longitudinal increasing trend of African dust contribution to PM10 is also observed from 25° E eastwards, and is due to the annual occurrence of intense dust episodes. Thus, the slightly higher frequency of African dust episodes over the lower part of Central Mediterranean is compensated by its moderately lower intensity. Concerning seasonality patterns and intensity characteristics, a clear summer prevalence is observed in the western part, with low occurrence of severe episodes (daily dust averages over 100 μg m−3 in PM10); no seasonal trend is detected in the central region, with moderate-intensity episodes; and significantly higher contributions are common in autumn-spring in the eastern side, with yearly occurrence of various severe episodes. Overall, African dust emerges as the largest PM10 source in regional background southern areas of the Mediterranean (35–50% of PM10), with seasonal peak contributions to PM10 up to 80% of the total mass. The multi-year study of African dust episodes and their contributions to PM10 concentrations allowed us to identify a consistent decreasing trend in the period 2006/2007 to 2011 in 4 of the 17 studied regions, all of them located in the NW of the Mediterranean. The observed trend is almost parallel to the NAO (North Atlantic Oscillation) index for the summer period, progressively more negative since 2006 onwards. As a consequence, a sharp change in the atmospheric circulation over the last 5 yr (a similar negative NAO period occurred in the 1950 decade) have affected the number of African dust episodes and their mean contribution to PM10 in the NW part of the Mediterranean. The investigation of summer temperatures at 850 hPa suggest that warm air accomplishing African dust air masses moved anomalously through the central Mediterranean in the 2007–2008 period, whereas it was displaced atypically to the NW African coast and the Canary Islands in the 2009–2011 period.

Shedding light on the effects of climate change on the potential distribution of Xylella fastidiosa in the Mediterranean basin

2016 ◽  
Vol 18 (6) ◽  
pp. 1759-1768 ◽  
Author(s):  
Luciano Bosso ◽  
Mirko Di Febbraro ◽  
Gennaro Cristinzio ◽  
Astolfo Zoina ◽  
Danilo Russo
Keyword(s):  
Climate Change ◽  
Mediterranean Basin ◽  
Potential Distribution ◽  
Xylella Fastidiosa ◽  
The Mediterranean ◽  
The Mediterranean Basin

Cumani

2021 ◽  
Author(s):  
Lorenzo Pubblici
Keyword(s):  
Mediterranean Basin ◽  
Western Europe ◽  
Eastern Asia ◽  
Global Space ◽  
Eurasian Continent ◽  
Social Heterogeneity ◽  
The Mediterranean ◽  
The Mediterranean Basin

This book is a synthesis of the great migrations of the 6th-13th centuries, focused on the median space between the two extremes of the Eurasian continent: Western Europe and Eastern Asia. In the light of the sources, it aims to reassess the complexity of the relationships between the nomads of the steppes and the sedentarized societies that came into contact with them. The choice to focus on the Qïpčaq-Cumans is due to their history, unique because they never constituted an organized and centralized center of collective power (stateless nomads); and paradigmatic, because it encompasses all the constitutive elements of steppe nomadism: social heterogeneity, mobility, military preparation, attraction for trade and willingness to negotiate. The migrations of the nomads of the steppes and their arrival close to the great organized communities of the Islamic and Christian world, from Asia to Europe, contributed to triggering a process of integration between Asia and the Mediterranean basin, a process that the Mongol invasion and conquest completed, giving birth to a new shared global space.

Centers of Power, Weapons of Iron

2013 ◽  
Author(s):  
T. Douglas Price
Keyword(s):  
Bronze Age ◽  
Iron Age ◽  
Western Europe ◽  
Raw Materials ◽  
Mediterranean Area ◽  
First Millennium ◽  
The Alps ◽  
Iron Artifacts ◽  
The Mediterranean ◽  
City States

The introduction of iron after 1000 BC brought new tools and weapons to Europe. Smelting technology and higher furnace temperatures were likely the key to iron production, which is generally thought to have originated in Anatolia around 1400 BC among the Hittites, but there are a few earlier examples of iron artifacts as old as 2300 BC in Turkey. Iron produced sharper, more readily available implements and was in great demand. In contrast to copper and tin, whose sources were limited, iron was found in a variety of forms in many places across the continent. Veins of iron ore were exploited in Iberia, Britain, the Alps, the Carpathian Mountains, and elsewhere. Bog iron was exploited in northern Europe. Carbonate sources of iron in other areas enabled local groups to obtain the raw materials necessary for producing this important material. At the same time, the collapse of the dominant Bronze Age civilizations of the Aegean changed the flow of raw materials and finished products across Europe. Greece fell into a Dark Age following the demise of the Mycenaean city-states. The Etruscans were on the rise in Italy. Rome was a small town at the border of the Etruscan region. Soon, however, new centers of power in classic Greece and Rome emerged, bringing writing and, with it, history to Europe. Again, we can observe important and dramatic differences between the “classic” areas of the Mediterranean and the northern parts of “barbarian” Europe. The chronology for the Iron Age in much of Europe is portrayed in Figure 6.2. The Iron Age begins earlier in the Mediterranean area, ca. 900 BC, where the Classical civilizations of Greece, the Etruscans, and eventually Rome emerge in the first millennium BC. Rome and its empire expanded rapidly, conquering much of western Europe in a few decades before the beginning of the Common Era and Britain around ad 43, effectively ending the prehistoric Iron Age in these parts of the continent. The Iron Age begins somewhat later in Scandinavia, around 500 BC.

scholarly journals Scenarios in the development of Mediterranean cyclones

2007 ◽  
Vol 12 ◽  
pp. 59-65 ◽  
Author(s):  
M. Romem ◽  
B. Ziv ◽  
H. Saaroni
Keyword(s):  
Atlantic Ocean ◽  
North Africa ◽  
Mediterranean Basin ◽  
Western Europe ◽  
Winter Season ◽  
Sahara Desert ◽  
Sea Level Pressure ◽  
Mediterranean Cyclones ◽  
The Mediterranean ◽  
The Mediterranean Basin

Abstract. The Mediterranean is one of the most cyclogenetic regions in the world. The cyclones are concentrated along its northern coasts and their tracks are oriented more or less west-east, with several secondary tracks connecting them to Europe and to North Africa. The aim of this study is to examine scenarios in the development of Mediterranean cyclones, based on five selected winter seasons (October–March). We detected the cyclones subjectively using 6-hourly Sea-Level Pressure maps, based on the NCAR/NCEP reanalysis archive. HMSO (1962) has shown that most Mediterranean cyclones (58%) enter the Mediterranean from the Atlantic Ocean (through Biscay and Gibraltar), and from the south-west, the Sahara Desert, while the rest are formed in the Mediterranean Basin itself. Our study revealed that only 13% of the cyclones entered the Mediterranean, while 87% were generated in the Mediterranean Basin. The entering cyclones originate in three different regions: the Sahara Desert (6%), the Atlantic Ocean (4%), and Western Europe (3%). The cyclones formed within the Mediterranean Basin were found to generate under the influence of external cyclonic systems, i.e. as "daughter cyclones" to "parent cyclones" or troughs. These parent systems are located in three regions: Europe (61%), North Africa and the Red Sea (34.5%) and the Mediterranean Basin itself (4.5%). The study presents scenarios in the development of Mediterranean cyclones during the winter season, emphasizing the cyclogenesis under the influence of various external forcing. The large difference with respect to the findings of HMSO (1962) is partly explained by the dominance of spring cyclones generating in the Sahara Desert, especially in April and May that were not included in our study period.

scholarly journals The MEDWATERICE project: Towards a sustainable water use in Mediterranean rice-based agro-ecosystems

2021 ◽  
Author(s):  
Arianna Facchi ◽  
Keyword(s):  
Water Use ◽  
Mediterranean Basin ◽  
Social Sustainability ◽  
Mediterranean Area ◽  
Irrigation District ◽  
Private Companies ◽  
Irrigation Methods ◽  
The Mediterranean ◽  
The Mediterranean Basin ◽  
Surface Drip Irrigation

&lt;p&gt;In the Mediterranean basin, rice is cultivated over an area of 1,300,000 hectares. The most important rice-producing countries are Italy and Spain in Europe (72% of the EU production; 345,000 ha), and Egypt and Turkey among the extra-EU countries (almost totality of the production; 789,000 ha). Traditionally, rice is grown under continuous flooding; thus, it requires more water than non-ponded crops. On the other hand, rice is strategic for food security in some countries such as Egypt, and human consumption in the whole Mediterranean is steadily increasing.&lt;/p&gt;&lt;p&gt;The MEDWATERICE project (PRIMA-Section 2-2018; https://www.medwaterice.org/), which started in April 2019, aims to explore the sustainability of innovative rice irrigation methods and technologies in the Mediterranean basin, in order to reduce rice water use and environmental impacts, and to extend rice cultivation outside of traditional paddy areas to meet the growing demand. The MEDWATERICE consortium includes universities, research centres and private companies operating in the Mediterranean area (IT, ES, PT, EG, TR, IL). Case studies (CSs) are implemented in pilot farms of the countries involved in the project. Tested alternative irrigation methods and technologies adopted in each CS are being tailored to local conditions using a participatory action research approach through the establishment of Stake-Holder Panels in each country, which include regional authorities, water managers, farmers&amp;#8217; associations and consultants, and private companies of the rice production chain. Irrigation strategies experimented in the pilot farms and compared to the continuous flooding (considered as the &amp;#8216;reference&amp;#8217; irrigation method in all CSs), are: dry seeding and delayed flooding, alternate wetting and drying, lengthening of drying periods, reduction in irrigation inflow/outflow, hybrid irrigation, multi-nozzle sprinkler irrigation, surface and sub-surface drip irrigation, and waste-water reuse through sub-surface drip irrigation. For each irrigation solution, innovative technologies and the most appropriate rice varieties and agronomic practices are tested to minimize impacts of irrigation water reduction on yield quantity and quality. Data collected at the farm level are extrapolated to the irrigation district level to support water management decisions and policies. Indicators for quantitative assessment of environmental, economic and social sustainability of the irrigation options are also being defined. Outcomes produced by MEDWATERICE are expected to generate knowledge on how to improve sustainability of rice production in the countries of the Mediterranean area, with particular attention to the adoption of water-saving techniques.&lt;/p&gt;&lt;p&gt;During the conference, approaches and methodologies adopted and developed within the project, and results obtained so far will be presented, with particular attention to the experimentation conducted in the pilot farms, to the methods for the upscaling the achievements to the irrigation district scale, and to the set of indicators for quantifying economic, environmental and social sustainability of irrigation methods and technologies currently under definition.&lt;/p&gt;

scholarly journals How Do Plant Diseases Caused by Xylella fastidiosa Emerge?

Plant Disease ◽  
2015 ◽  
Vol 99 (11) ◽  
pp. 1457-1467 ◽  
Author(s):  
Rodrigo P. P. Almeida ◽  
Leonard Nunney
Keyword(s):  
Xylella Fastidiosa ◽  
Severe Disease ◽  
Disease Outbreaks ◽  
Plant Diseases ◽  
Regulatory Agencies ◽  
Disease Emergence ◽  
Number Of Factors ◽  
New Information ◽  
Controversial Topic ◽  
Phylogenetic Framework

Emerging plant diseases frequently have significant economic, environmental, cultural, and social impacts. The prediction of new disease emergence, associated with new pathogens or not, remains a difficult and controversial topic. The main factors driving epidemics are often only identified several years after outbreaks, generally revealing that a limited number of factors are associated with the emergence of specific groups of pathogens. This pattern is illustrated in the insect-borne xylem-limited bacterium Xylella fastidiosa, an organism associated with several new plant diseases in different regions of the globe. Research during the last decade focusing on several severe disease outbreaks has led to substantial changes in our understanding of X. fastidiosa biology, ecology, and evolution. This new information has not only led to new insights into aspects of the biology of this bacterium and its interactions with plant and insect hosts, but also made available a phylogenetic framework that has allowed for better inferences concerning factors leading to the emergence of diseases. Here we identify and discuss these main pathways leading to epidemics caused by X. fastidiosa. Our ultimate goal was to raise critical questions and issues for academics and regulatory agencies alike, since the information generated during the last decade has both raised new questions but also clarified old ones.

scholarly journals A modelling study of photochemical regimes over Europe: robustness and variability

2010 ◽  
Vol 10 (20) ◽  
pp. 10067-10084 ◽  
Author(s):  
M. Beekmann ◽  
R. Vautard
Keyword(s):  
Model Uncertainty ◽  
Mediterranean Basin ◽  
Western Europe ◽  
Regional Scale ◽  
Time Variability ◽  
Nox Emissions ◽  
Continental Scale ◽  
The Mediterranean ◽  
North Western ◽  
The Mediterranean Basin

Abstract. The variability of the relative sensitivity of photochemical ozone formation to volatile organic compounds (VOC) and NOx emissions, the chemical regime, over Europe during summers 2001 to 2003 is simulated with a regional scale transport-chemistry model. The robustness and variability of chemical regimes is shown. A VOC sensitive regime over North-Western Europe and a mainly NOx sensitive regime over the Mediterranean basin and Eastern Europe are found, confirming earlier published results. The chemical regime time variability, its robustness with respect to several environmental factors (seasonality, interannual variability) and with respect to model uncertainty are thoroughly analysed. For the regions with well pronounced chemical regimes over North-Western Europe and the Mediterranean, the chemical regime occurrence only slightly depends on the ozone target considered – daily ozone or Ox (= O3 + NO2) maximum or mean, AOT's, SOMO35, .... For these regions, differences between particular years and summer months are weak, day to day variability is significant but does not change the occurrence of one or another chemical regime. On the contrary, over North-Eastern Germany, the chemical regime changes form one day to another and is also dependent on the ozone target chosen. Expected decreases in anthropogenic NOx emissions over Europe since the last and for the next few decades have shifted and will shift chemical regimes to more NOx sensitive. The predictive skill of chemical regime indicator species is made evident at continental scale, extending their spatial range of applicability with respect to earlier studies. Several sensitivity tests were performed in order to account for major sources of model uncertainty. With the exception of regions near ship tracks over the Mediterranean basin, the spatial pattern of chemical regimes appears to be robust with respect to model uncertainty for all cases tested.

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