Search results for "RANGE"
showing 10 items of 4508 documents
Ecological variation between marginal and central populations of Potamogeton polygonifolius, a rare and endangered species in Central Europe
2012
Abstract The present study is focused on Potamogeton polygonifolius – the species considered to be endangered in Germany, the Czech Republic, Poland and Switzerland. Field studies were carried out in Lower Silesia and Lusatia in southwestern Poland in order to verify the present state of the marginal populations of P. polygonifolius, to determine the habitat preferences of the species in the study area, to compare the ecological data between marginal and central populations and finally to recognise the factors constraining the easternmost limit of the P. polygonifolius. In total, 18 populations were examined, and 11 releves were collected. The releves gathered were compared with 95 releves …
The Madonie: Highlands in Sicily
2019
This chapter presents the results of the archaeological survey of selected areas across the Madonie mountain range in Sicily, at different heights. Several archaeological features have been mapped, documenting the human presence on these highlands over different millennia and dating it back at least to the Middle Neolithic. Traces of ancient cultures of Sicily have been recognized in the area, emphasizing the importance of this mountainous territory.
Environment in Megacities: Tehran Waterscapes
2021
Defining contemporary urban paradigms is the challenge of this time, especially when the urban dynamics are so fluid they spread uncontrollably in overextended and overpopulated territories. This is the case for megacities, metropolitan areas with more than 10 million inhabitants, which place the emphasis on how to manage energy consumption in such filled places. In this frame, the city of Tehran, the capital of the Islamic Republic of Iran, scene of political and cultural disputes, administrative and economic headquarter of the country, with its nearly 15 million residents and a daily traffic of more than 20 million people, is currently one of the most populous cities in the world and repr…
Orthotrichum consobrinumCardot in Western Europe and South-Western Asia
2009
Abstract Orthotrichum consobrinum Cardot, a moss that was earlier considered an endemic to the Sino-Japanese Region, has been found in the north of the Iberian Peninsula (Spain) and in north-eastern Anatolia (Turkey). Comparison of Spanish and Turkish material with eastern Asiatic specimens revealed no relevant morphological differences, and the specimens from both disjunct populations showed the same range of variation of the species attributes. However, the morphological analysis has revealed some distinctive features of the species that had been overlooked in the past. An updated description of this Euro-Asiatic moss is provided here.
Changes in vegetation spring dates in the second half of the twentieth century
2011
This study aims at estimating trends in spring phenology from vegetation index and air temperature at 2 m height. To this end, we have developed a methodology to infer spring phenological dates from Global Inventory Modeling and Mapping Studies GIMMS Normalized Difference Vegetation Index NDVI time-series, which are then extrapolated to the period 1948–2006 with the help of Reanalysis data, using its 2 m height air temperature parameter. First, yearly NDVI is fitted to a double-logistic function for the whole extent of the GIMMS database 1981–2003. This fitting procedure allows us to describe, on a yearly basis, the NDVI evolution for each pixel through the estimation of six parameters whic…
U-Pb and Pb-Pb zircon ages for metamorphic rocks in the Kaoko Belt of Northwestern Namibia: A Palaeo- to Mesoproterozoic basement reworked during the…
2004
The Kaoko Belt belongs to the Neoproterozoic mobile belt system of western Gondwana, whose geodynamic evolution is assumed to have resulted from collision between the Congo Craton (present Africa) and the Rio de la Plata Craton (present South America). Several magmatic intrusion periods can be distinguished in the coastal area of this belt, based on conventional U-Pb, SHRIMP and Pb-Pb evaporation analyses on zircons. The prevailing igneous rock types are of granitic to tonalitic composition. A Palaeoproterozoic terrain with U-Pb magmatic emplacement ages between ~2.03 and 1.96 Ga may be correlated with the Eburnian event (~1.8 to 2.0 Ga), which is widespread in Africa. Additionally, two dis…
Limiting climatic factors and habitats ofErica tetralixat the eastern edge of its distribution range
2015
We determined the limiting climatic factors, as well as the preferred habitats, of Erica tetralix L. at the eastern limit of its distribution range in the eastern Baltic region. It was found that E. tetralix in this region is a typical bog woodland plant preferring the wettest Sphagnum-rich sites. Northern Atlantic wet heath fragments, base-rich fens and species-rich Nardus grasslands were other habitats for the species. The species composition in E. tetralix habitats resembled that found in appropriate habitats within its main distribution range, although the habitats in the eastern Baltic region lack many Atlantic floristic elements characteristic of wet heath. A generalised linear model …
Palaeoecology of non marine algae and stromatolites: Permian of France and adjacent countries
1999
Abstract Some Permian, continental basins from Algeria, Morocco, France, Italy, Germany and Poland reveal algal remains and stromatolites, mainly during Lower Permian, but also during Middle and Upper Permian. The algae belong to 8 morphogenera and 12 morphospecies. Two species are new. The taxonomic attributions are difficult, even if some species resemble living species. The algae make unorganized masses, or laminated builtups (stromatolites, oncolites, oolites). Algal masses and stromatolites are contained in fluviatile sediments (active or abandoned channels) and lacustrine deposits (playas, ephemeral lakes shorelines, lakes several meters or decameters deep). Considering the sedimentol…
Discussion about the stratigraphic range of "Pseudofurnishius murcianus" van den Boogaard (Conodonta) in the Iberian Peninsula, from the Calasparra s…
2011
The biostratigraphy of Calasparra Section is well-estabished with an ammonoid biozonation and ranges from Lower to Upper Ladinian. The continuous presence of Pseudofurnishius murcianus van den Boogaard, a characteristic conodont species of the Sephardic realm, along the section makes it one of the most important sections in the Iberian Peninsula for the study of the species. The first apparition of P. murcianus in the section corresponds with the first of Eoprotrachyceras curionii taxon, which is the principal marker for the base of the Ladinian stage in the GSSP of the Anisian-Ladinian boundary, and the age of the youngest conodonts, based on ammonoids (Epigonus Zone) is Lower Ladinian (up…
Rare and threatened pondweed communities in anthropogenic water bodies of Opole Silesia (SW Poland)
2011
The paper presents results of geobotanic studies conducted in anthropogenic water bodies like excavation ponds, fish culture ponds, other ponds, dam reservoirs, ditches, channels and recreational pools incl. watering places in Opole Silesia and surroundings in the years 2002-2005. The research focused on occurrence of threatened and rare pondweed communities. As the result of the investigations of several dozen of water bodies, 28 localities of rare pondweed communities were documented by 75 phytosociological relevés. Associations of <em>Potametum trichoidis</em> J. et R Tx. in R. Tx. 1965, <em>Potametum praelongi</em> Sauer 1937, <em>P. alpini</em> Br.-B…