Temat: regime shift - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Biotic interactions, energy pathways and trigger factors of ecosystem dynamics in shallow saline lakes
Autorzy:: Golubkov, Sergei
Golubkov, Mikhail
Balushkina, Evgenia
Litvinchuk, Larisa
Powiązania:: https://bibliotekanauki.pl/articles/470793.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:: saline lakes
primary production
secondary production
zooplankton
zoobenthos
energy pathways
regime shift
Opis:: Environmental variables, food-web dynamics and energy pathways were investigated in ecosystems of six shallow lakes of the Crimea with salinity ranging from 24 to 340 ‰. There were considerable inter- and intra-annual fluctuations in the abiotic characteristics of the lakes. All the lakes had a very high concentration of total phosphorus in the water (up to 5.6 gP m-3) due to a great influence of the watershed on the lakes. A high level of primary production (up to 14.9 gC m-2 d-1) was found in the most of the lakes. The lowest primary production was found in the most saline lake with a dense population of the filtrator, Artemia urmiana. Grazing benthic energy pathways were dominant at salinities between 24 and 58 ‰. Greater levels of salinity led to a gradual reduction of benthic and increase of planktonic energy pathways. A fast shift from turbid to clear-water regime was observed in one of the lakes, caused by annual variations in weather conditions
Źródło:: Studia Ecologiae et Bioethicae; 2014, 12, 4; 83-113
1733-1218
Pojawia się w:: Studia Ecologiae et Bioethicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The effect of financial, macroeconomic and sentimental factors on stock market volatility
Autorzy:: Czapkiewicz, Anna
Choczyńska, Agnieszka
Powiązania:: https://bibliotekanauki.pl/articles/1047382.pdf
Data publikacji:: 2021-05-31
Wydawca:: Główny Urząd Statystyczny
Tematy:: regime shift
equity volatility
macroeconomic factors
sentimental factors
financial markets
TVPMS model
Opis:: The aim of this paper is to find economic factors that could be helpful in explaining the market's shifts between periods of prosperity and crisis. The study took into account the main stock indices from developed markets of the USA, Germany and Great Britain, and from two emerging markets, i.e. Poland and Turkey. The analysis confirms the existence of two different states of volatility in these markets, namely the state with a positive returns' mean and low volatility, and the state with a negative or insignificant mean and high volatility. The Markov-switching model with a dynamic probability matrix was applied in the study. The subject of the analysis was the impact of domestic and global factors, such as VIX and TED spread, oil prices, sentiment indices (ZEW), and macroeconomic indices (unemployment, longterm interest rate, CPI), on the probability of switching between the states. The authors concluded that in all the examined countries, changes in long-term interest rates have an influence on market returns. However, the direction of this impact is different for developed and emerging markets. As regards developed markets, high prices of oil, 10-year bonds, and the ZEW index can suggest a high probability of the countries remaining in the first state, whereas an increase in the VIX index and the TED spread significantly reduces the probability of staying in this state. The other studied factors proved to be rather local in nature.
Źródło:: Przegląd Statystyczny; 2020, 67, 4; 274-293
0033-2372
Pojawia się w:: Przegląd Statystyczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The influence of natural and anthropogenic factors on grain size distribution along the southeastern Baltic spits
Autorzy:: Žilinskas, G.
Jarmalavičius, D.
Pupienis, D.
Powiązania:: https://bibliotekanauki.pl/articles/2059756.pdf
Data publikacji:: 2018
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: longshore sediment transport
human activity
geological framework
lithological anomalies
shift regime detection
Opis:: The influence of natural and anthropogenic factors on the distribution of sand grain size along sandy beaches is assessed, based on study of three spits of the southeastern Baltic Sea: the Curonian, Vistula and the Hel. 330 sand samples were collected from the beach and foredune at 1 km intervals. Our findings show that although the three spits have some characteristics in common, e.g. a predominance of fine- and medium-grained marine sand on their beaches and foredunes, the grain size distribution patterns of the recent sediments along these spits differ significantly. The key factors determining the grain size distribution include the dominant hydrometeorological regime, anthropogenic activity and geological framework. Trends in the mean grain size differentiation along the Vistula and Curonian spits directly correlate with the direction of the longshore sediment transport: as the distance from sources of the longshore sediment transport increases, the size of sand particles, both on the beach and the foredune, decreases. By contrast, on the Hel Spit, this pattern is disturbed in areas of hydrotechnical construction and artificial beach nourishment. Sand differentiation along the beach can also be predetermined by the geological framework, particularly in lithologically anomalous sections, such as the Juodkrantè settlement on the Curonian Spit.
Źródło:: Geological Quarterly; 2018, 62, 2; 375--384
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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