Search results for "Alpi"
showing 10 items of 159 documents
Pēdējais Pinguicula alpina L. paraugs no Staburaga
1961
LU Muzeja Botānikas un mikoloģiju kolekciju herbārijā glabājas vairāki alpu kreimules herbāriji, kas ievākti gan Igaunijā, gan Latvijā. Auga vienīgā dabiskā augtene Latvijā bija Staburags, kas tika apludināts līdz ar HES būvniecību. Vēlākos gados tā bija atrodama arī Raunas Staburagā. Alpu kreimules paraugi LU Muzejā glabājas Herbarium Latvicum (RIG II), Herbarium Balticum (RIG I), Herbarium Lakshewitzi (RIG III) un Jāņa Ilstera herbārijā. Herbarium Latvicum glabājas pēdējais uz Staburaga Botāniķes Gaidas Ābeles (dz. 1931. gadā) ievāktais paraugs.
Populetum pamiricae ass. nova – an endemic forest association to Pamir in Tajikistan (Middle Asia)
2015
Abstract The floristic structure, distribution and habitat requirements of a forest syntaxon, Populetum pamiricae ass. nova is described. The potential range of the Populetum pamiricae association comprises the mountains of eastern Tajikistan (Pamir Alai Mts), Kashgaria in western China (Kunlun Shan Mts) and north-eastern Afghanistan (Hindu Kush Mts) in Middle Asia. The biotope of this community comprises of high mountain river valleys situated at elevations between 2,500 and 3,200 m above sea level. Phytocoenoses of the Populetum pamiricae association are characterized by the apparent domination in the tree layer of a diagnostic species, Populus pamirica. The tree stand has a mean cover ar…
Past, present and future of mountain species of the French Massif Central - the case ofSoldanella alpinaL. subsp.alpina(Primulaceae) and a review of …
2012
Aim Our goals were: (1) to investigate patterns of genetic variation in the French Massif Central (MC) of Soldanella alpina (Primulaceae), an alpine plant species that has only one known population in the region; (2) to analyse these patterns in order to deduce the Quaternary history of the population and to predict how current climatic warming may affect it; and (3) to review molecular analyses from the MC to evaluate the importance of the region for the conservation of genetic diversity. Location Europe, with a special focus on the French Massif Central and adjacent regions. Methods Amplified fragment length polymorphisms (AFLPs) were analysed for 192 individuals (nine populations) of …
Long‐distance dispersal vs vicariance: the origin and genetic diversity of alpine plants in the Spanish Sierra Nevada
2006
Here, we investigated the origin and genetic diversity of four alpine plant species co-occurring in the Spanish Sierra Nevada and other high mountains in south-western Europe by analysis of amplified fragment length polymorphisms (AFLPs). In Kernera saxatilis, Silene rupestris and Gentiana alpina we found intraspecific phylogroups corresponding to mountain regions as predicted by the vicariance hypothesis. Moreover, genetic distances between Sierra Nevada and Pyrenees populations were always higher than those between populations from the Pyrenees and the south-western Alps/Massif Central. This suggests successive disruption of gene exchange between mountain ranges as postglacial climatic wa…
On the non-malacostracan crustaceans (Crustacea: Branchiopoda, Copepoda, Ostracoda) from the inland waters of Fthiotida (Greece)
2019
In the frame of the activities of the LIFE11 NAT/GR/1014 ForOpenForests, some water bodies occurring in the "Ethnikos Drymos Oitis" (GR2440004) and "Oros Kallidromo" (GR2440006) (Sterea Ellada) were investigated with the aim of providing a first census of the composition and diversity of their crustacean fauna. Overall, the sampling of 15 water bodies (7 of them listed as "Mediterranean temporary ponds" sensu EU "Habitats Directive") led to the finding of 13 branchiopod, 11 copepod, and 7 ostracod taxa, including 4 species new for mainland Greece, i.e. the copepods Arctodiaptomus alpinus (Imhoff, 1885) and Diaptomus cf. serbicus, and the branchiopods Leptestheria dahalacensis (Rüppel, 1837)…
The oldest rocks of Greece: first evidence for a Precambrian terrane within the Pelagonian Zone
2005
The Pelagonian Zone in Greece represents the westernmost belt of the Hellenide hinterland (Internal Hellenides). Previous geochronological studies of basement rocks from the Pelagonian Zone have systematically yielded Permo-Carboniferous ages. In this study we demonstrate, for the first time, the existence of a Precambrian crustal unit within the crystalline basement of the Pelagonian Zone. The U–Pb single-zircon and SHRIMP ages of these orthogneisses vary from 699 ± 7 Ma to 713 ± 18 Ma, which identify them as the oldest rocks in Greece. These Late Proterozoic rocks, which today occupy an area of c. 20 × 100 km, are significantly different from the neighbouring rocks of the Pelagonian Zone.…
Senākais Pinguicula alpina L. paraugs Latvijā
1867
LU Muzeja Botānikas un mikoloģiju kolekciju herbārijā glabājas vairāki alpu kreimules herbāriji, kas ievākti gan Igaunijā, gan Latvijā. Auga vienīgā dabiskā augtene Latvijā bija Staburags, kas tika apludināts līdz ar HES būvniecību. Vēlākos gados tā bija atrodama arī Raunas Staburagā. Alpu kreimules paraugi LU Muzejā glabājas Herbarium Latvicum (RIG II), Herbarium Balticum (RIG I), Herbarium Lakshewitzi (RIG III) un Jāņa Ilstera herbārijā. Herbarium Latvicum glabājas senākais zināmais alpu kreimules paraugs, kas ievākts 1867. gadā.
Data from: Exposing the structure of an Arctic food web
2016
How food webs are structured has major implications for their stability and dynamics. While poorly studied to date, arctic food webs are commonly assumed to be simple in structure, with few links per species. If this is the case, then different parts of the web may be weakly connected to each other, with populations and species united by only a low number of links. We provide the first highly resolved description of trophic link structure for a large part of a high-arctic food web. For this purpose, we apply a combination of recent techniques to describing the links between three predator guilds (insectivorous birds, spiders, and lepidopteran parasitoids) and their two dominant prey orders …
Reliability and effectiveness of Ellenberg’s indices in checking flora and vegetation changes induced by climatic variations
2001
Two methods are proposed to assess the significance of time-spanned local variations of Ellenberg’s indicator values in floristic and phytosociological data sets respectively. Both methods are based on frequencies and averages of the indicator values within and among data sets. Main goal of proposed methods is to determine the threshold above which the observed variations are to be considered significant. In order to relate the observed floristic variations to recent climatic changes, attention was focused on the Ellenberg’s indices dealing with the main climatic variables: heliophany, temperature and precipitation. Study-cases from Zannone Island (Pontine Archipelago, Mediterranean region)…
Changes in the seasonal snow cover of alpine regions and its effect on soil processes: A review
2007
Abstract At its maximum annual development, snow can cover more than half the Northern Hemisphere land area with one-third experiencing seasonal snow cover. The precise conditions that develop during the annual pattern of snowpack development formation have implications for: (i) soil microbiological activity and nutrient transformations; (ii) the capacity of the accumulating snowpack to retain atmospheric derived solutes; (iii) preferential elution and rapid runoff of solutes from the snowpack during periods of thaw; and (iv) leaching of solutes. Long-term records of annual snow accumulation suggest that substantial, regional scale shifts in snowpack characteristics have been occurring. The…