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Wyszukujesz frazę "Mediterranean environment" wg kryterium: Temat

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    Tytuł:
    Natural regeneration and gender-specific spatial pattern of Taxus baccata in an old-growth population in Foresta Umbra (Italy)
    Autorzy:
    Vessella, F.
    Salis, A.
    Scire, M.
    Piovesan, G.
    Schirone, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/41142.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Mediterranean environment
    natural regeneration
    regeneration dynamics
    Taxus baccata
    English yew
    rare species
    dioecious species
    endangered species
    Italy
    Opis:
    English yew is rare and endangered dioecious species. Research on regeneration processes of endangered taxa is important to understand the mechanisms allowing a species to survive under several ecological scenarios, to predict future distribution shifts, to achieve best management practices and conservation policies. Our investigation was focusing on one of the oldest yew population in Europe, in Foresta Umbra in Italy. The main aim of this study was to understand spatial regeneration processes and dynamics related with parent trees’ sex distribution. Geostatistical analysis showed that seedlings occur in patches avoiding direct competition with adult yews. Negative relationship between regeneration and yew density and basal area was found. A general model for the reproductive ecology is proposed: females are less competitive and more environmentally demanding than males, because of their reproductive effort. Indeed, male and female fitness responds differently across environmental gradients, thus favouring spatial segregation of seedlings. Understanding the yew’s adaptive effectiveness is essential to ensure the conservation of existing populations, and encourage the species’ resilience into areas where yew is endangered.
    Źródło:
    Dendrobiology; 2015, 73
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Prevailing Weather and Traffic Conditions in the Evaluation of a Future ECA in the Mediterranean Sea. A view into the Western Mediterranean
    Autorzy:
    Castells, M.
    Martínez-Osés, F. X.
    Powiązania:
    https://bibliotekanauki.pl/articles/116879.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Traffic Condition
    Weather Condition
    Mediterranean Sea
    maritime transport
    Environment Protection
    Opis:
    Appendix III of MARPOL´s Annex VI sets out the criteria and procedures for designating an emission control area (ECA).These criteria includes: a clear delineation of the proposed ECA; types of emissions proposed for control, land and sea areas at risk; emission quantification and impact assessment; prevailing weather conditions; data and quality on marine traffic; land based measures concurrent with the ECA adoption and the relative costs of reducing emissions from ships. This paper analyses the climate parameter together with traffic conditions: prevailing weather conditions as a parameter to be kept in mind for the adoption of a future ECA in the Mediterranean Sea. Preliminary results would show how marine emissions coming from existing traffic will impact the sea and land ecology in the Mediterranean area.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 157-163
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecology and phytosociology of Cotoneaster shrublands in Central Alborz of Iran
    Autorzy:
    Ravanbakhsh, Hooman
    Hamzeh’ee, Behnam
    Moshki, Alireza
    Powiązania:
    https://bibliotekanauki.pl/articles/956974.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    cotoneaster kotschyi
    juniperus excelsa
    species-environment relationships
    mediterranean
    irano-turanian shrublands
    Opis:
    The genus Cotoneaster is considered an important taxon in the woodlands of the Mediterranean and Irano-Turanian regions. Some species of this genus were reported from the Irano-Turanian alpine woodlands. Irano-Turanian mountainous wood and shrublands have a great importance in terms of water and soil conservation, biodiversity and plant richness. There is a lack of quantitative and qualitative statistics available for many of these ecosystems. This research focused on the ecology and phytosociology of Cotoneaster shrublands in central Alborz (Iran), with emphasis on C. kotschyi, an endemic drought-tolerant species. Data was collected based on the Braun-Blanquet method. TWINSPAN was used to analyse the vegetation data. Species-environment analysis was performed by CCA (Canonical Correspondence Analysis) and oneway ANOVA. Relevés were classified into three distinct groups regarding their floristic composition. By organizing the phytosociological table, a new subassociation was defined and named as Rhamno pallasii-Juniperetum excelsae cotoneastretosum kotschyi subass. nova. This syntaxon is distributed in the range of 2,200–2,430 m a.s.l. between two other groups, i.e. Cotoneastro nummulariis-Juniperetum excelsae and Rhamno pallasii Juniperetum excelsae. Cotoneaster kotschyi ecologically is near to Rhamnus pallasii which is characteristic for Juniper communities on shallow soils and stony lands. Among the environmental variables, slope, soil texture, pH, lime and saturation percent are the most important distinguishing factors of this subassociation. So, the new syntaxon is found in the habitat with an average slope of 60%, sandy-loam soils and pH and lime percent less than other studied communities. The subassociation cotoneastretosum kotschyi has a higher amount of sand content compared to the other vegetation groups. Cotoneaster nummularius is an indicator of vegetation communities with relatively evolved soils. However, C. kotschyi grows in poor and shallow soils. C. kotschyi is a differential species which indicates the variability between the two main Alpine associations of the Irano-Turanian region. It is an appropriate species for plantation in the semi-arid mountainous areas. The ecological demands and the floristic composition of these plantations are determined in this article.
    Źródło:
    Dendrobiology; 2018, 79; 47-60
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identifying the main sources of silicate in coastal waters of the Southern Gulf of Valencia (Western Mediterranean Sea)
    Autorzy:
    Sospedra, J.
    Niencheski, L.F.H.
    Falco, S.
    Andrade, C.F.F.
    Attisano, K.K.
    Rodilla, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48753.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    silicon
    coastal water
    Valencia Gulf
    Mediterranean Sea
    salinity
    discharge
    nutrient
    marine environment
    Opis:
    Silicon is a major nutrient for siliceous primary producers, which can become a potential limiting nutrient in oligotrophic areas. Most of the silicon inputs to the marine environment come from continental discharges, from both superficial and ground waters. This study analyses the main sources of silicon and their dynamics along the southernmost 43 km of shoreline in the Gulf of Valencia (Western Mediterranean Sea). The salinity and silicate concentration in the different compartments (springs, freshwater wells, beach groundwater, surf zone and coastal waters) in this coastal area were determined. In addition, chlorophyll a and phytoplankton community were analyzed in the surf zone and coastal waters. Silicate concentrations in freshwater wells ranged between 130 and 150 μM, whereas concentrations of this nutrient declined to 49 μM in freshwater–seawater mixture transects. At the same time, there was a positive gradient in silicate for both freshwater and coastal waters southward. An amount of 18.7 t of dissolved silicate was estimated in the nearest first kilometre nearest to the coastline, 6 t of this silicate belonged to the background sea level. On the other hand, the sum of the main rivers in the area supplies 1.6 t of dissolved silicate per day. This implies that a large amount of the remaining 11.1 t must derive from submarine groundwater discharges, which would thus represent 59% of the coastal dissolved silicate budget. Overall, it is suggested that a subterranean transport pathway must contribute considerably to silicate concentrations throughout this zone, which is characterized as permeable.
    Źródło:
    Oceanologia; 2018, 60, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trophodynamic variations on microtidal North Mediterranean sandy beaches
    Autorzy:
    Vassallo, P.
    Fabiano, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48051.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coastal zone
    Mediterranean Sea
    benthic community
    beach environment
    sandy beach
    ecosystem
    trophodynamics
    Opis:
    Trophic models of the micro and meiobenthic community of six sandy beaches on the Ligurian coast (north-western Mediterranean Sea) have been performed to assess variations in structure and function of the ecosystem. A novel approach based on the determination of the feeding predisposition of the benthic community revealed that there is a significant shift in the trophodynamics of the system with respect to environmental constraints. Along an emerged-submerged gradient the benthic community displayed a clear trend from a fundamentally detritusdependent structure to an autotrophic, more balanced and diversified one. The trends analysed focus on the importance of the swash zone as a transitional area between the land and the sea that is characterised by a high diversity and activity of the trophic network.
    Źródło:
    Oceanologia; 2005, 47, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytoplankton and environmental variables as a water quality indicator for the beaches at Matrouh, South-Eastern Mediterranean Sea, Egypt: an assessment
    Autorzy:
    Gharib, S.M.
    El-Sherif, Z.M.
    Abdel-Halim, A.M.
    Radwan, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48802.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    abiotic environment
    beach
    biotic environment
    community structure
    diversity index
    Egypt
    environment variability
    hydrochemical change
    hydrographic change
    marine environment
    Matrouh beach
    Mediterranean Sea
    nutrient concentration
    phytoplankton
    water quality
    Opis:
    This study was carried out to determine the water quality of the beaches at Matrouh, south-eastern Mediterranean Sea, Egypt, by studying environmental variables as well as phytoplankton abundance and community structure. Surface water samples were monitored from a series of beach sites over a period of five seasons during 2009–2010. A total of 203 phytoplankton species were identified from seven algal divisions. Seasonal differences in the quantitative and qualitative composition of the phytoplankton communities in the different sites were marked. Nutrient concentrations and phytoplankton abundances were found to be poorer than those of many other areas along Egyptian coast. The Shannon-Wiener Diversity Index classified Matrouh water as being between clean and moderately polluted, whereas the WQI demonstrated that it was between good and excellent. It can be concluded that the index based onWQI is currently more suitable than the phytoplankton species index for assessing the quality of the water of the Matrouh beaches.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observations of new particle formation events in the South-Eastern Baltic Sea
    Autorzy:
    Plauskaite, K.
    Ulevicius, V.
    Spirkauskaite, N.
    Bycenkiene, S.
    Zielinski, T.
    Petelski, T.
    Ponczkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48201.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    meteorological parameter
    chemical parameter
    solar radiation
    coastal region
    coastal site
    marine environment
    Mediterranean coastal zone
    Opis:
    New particle formation and growth were observed at a coastal site (Preila station, Lithuania) during 1997 and 2000–2002. The total amount of data analysed covers 291 one-day periods, 45 (15%) of which were long-term, new particle formation days. Short-term nucleation events (from a few minutes to one hour) and long-term events (from one to eight hours) were identified. The mean particle growth rate, condensation sink and condensable vapour source rate during nucleation events were 3.9 nm h−1, 1.45 × 10−3 cm−3 s−1 and 7.5 × 104 cm−3 s−1 respectively. The average formation rate J10 was 0.4 cm−3 s−1. The nucleation events were accompanied mainly by air masses transported from the north (43%) and north-west (19%). Meteorological parameters and trace gas (O3, SO2, NO2) concentrations were also analysed. It was found that nucleation events are related to high levels of solar radiation.
    Źródło:
    Oceanologia; 2010, 52, 1; 53-75
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Protozoa in a stressed area of the Egyptian Mediterranean coast of Damietta, Egypt
    Autorzy:
    Dorgham, M.M.
    El-Tohamy, W.S.
    Abdel-Aziz, N.E.
    El-Ghobashi, A.
    Qin, J.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/49061.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    environment condition
    pollution indicator
    tintinnid
    Protozoa
    Egyptian Mediterranean coast
    Egypt
    Diametta coast
    aquatic ecosystem
    coastal water
    eutrophication
    Źródło:
    Oceanologia; 2013, 55, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of different doses of post-emergence-applied iodosulfuron on weed control and grain yield of malt barley (Hordeum distichum L.), under Mediterranean conditions
    Autorzy:
    Barros, J.C.
    Calado, J.G.
    Basch, G.
    Carvalho, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/66291.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    different dose
    herbicide dose
    iodosulphuron
    weed control
    grain yield
    malt barley
    barley
    Hordeum distichum
    six-row barley
    Mediterranean area
    environment condition
    Opis:
    A study was carried out over a two year period (2009/2010 and 2012/2013) on an experimental farm in the Alentejo region (Beja), in southern Portugal where rainfed malt barley (Hordeum distichum L.) is sown at the end of autumn or beginning of winter (November– December). The aim of this experiment was to study the efficiency of the herbicide iodosulfuron-methyl-sodium to control post-emergence broadleaved weeds in this cereal crop. The malt barley crop was established using no-till farming. This technology provides the necessary machine bearing capacity of the soil to assure the post-emergence application of herbicides at two different weed development stages. The herbicide iodosulfuron-methyl-sodium was applied at three doses (5.0, 7.5, and 10.0 g a. i. · ha–1) and at two different broadleaved weed development stages (3 to 4 and 6 to 7 pairs of leaves), that also corresponded to two different crop development stages (beginning of tillering and complete tillering). The results indicated that early herbicide application timing provided a significantly higher efficiency for all the applied herbicide doses, but this better weed control was not reflected in a higher crop grain yield. The lack of a higher crop grain yield was probably due to a crop phytotoxicity of the herbicide, when used at an early application timing.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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