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    Tytuł:
    Seasonal fluctuations of photosynthetic pigments content in Taxus baccata needles
    Autorzy:
    Zarek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41084.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    seasonal fluctuation
    photosynthetic pigment content
    Taxus baccata
    needle
    pigment
    sex
    age
    chlorophyll
    Opis:
    Yew is a coniferous, evergreen, dioecious species. The objective of the study was to present a comprehensive characteristic of changes occurring throughout the year in terms of the content of photosynthetic pigments and related compounds in the needles of yew, depending on the sex of individuals and age of needles. Eight compounds, particularly chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoids (Car), protoporphyrin IX (PPIX), magnesium protoporphyrin IX (MgPPIX), protochlorophyllide (Pchlide), chlorophyllide a (Chlide a), and chlorophyllide b (Chlide b), were subjected to quantitative analysis. Based on the several parameters under study, significant differences between male and female individuals were observed, while most commonly, the largest differences were reported in the autumn and winter period. They were related to the content of Chl a, Chl b and Chl/Car ratio. The remaining compounds showed no significant differences according to the sex and were slightly different only in single periods. For all the studied parameters except for Chl/Car ratio, interaction between sampling dates and sex was not statistically significant. Significant differences between the needles of different age were observed only in terms of the content of Chl b, MgPPIX, Pchlide, Chlide b, and Chl a/b ratio, and these differences were always caused by the current-year needles.
    Źródło:
    Dendrobiology; 2016, 76
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rye price variability in Poland between 2010 and 2018
    Zmienność cen żyta w Polsce w latach 2010-2018
    Autorzy:
    Utnik-Banaś, K.
    Vasilyeu, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1790403.pdf
    Data publikacji:
    2019
    Wydawca:
    The Polish Association of Agricultural and Agribusiness Economists
    Tematy:
    price variability
    seasonal fluctuation
    time series decomposition
    zmienność cen
    wahania sezonowe
    dekompozycja szeregów czasowych
    Opis:
    In the paper, the range of rye price variability was determined and a decomposition of a time series of prices was carried out, distinguishing seasonal, cyclical and irregular fluctuations. The rye market is a market of a product produced seasonally but with a storage period longer than one season, which influences seasonal changes of prices, on which economic changes overlap. The research material consists of prices of rye in monthly graduation for the years 2010-2018, from the Integrated System of Agricultural Market Information. In the analyzed period, the nominal price of rye more than doubled from 327 PLN/t in January 2010 to 719 PLN/t in December 2018. The coefficient of variability of rye prices ranged from 4.0% to 27.2%. The decomposition of the time series of prices indicates seasonal, cyclical and irregular fluctuations. The amplitude of seasonal fluctuations was 14% on average, the highest prices were in June (105%) and the lowest in August (91%). Cyclical changes averaged 71.2% per year, seasonal changes 17.9% and irregular changes 10.9% of overall rye price variation. The production of rye is steadily falling both in the world and Poland.
    Celem artykułu jest próba określenia zakresu zmienności cen żyta. Przeprowadzono także dekompozycję szeregu czasowego cen, wyróżniając wahania sezonowe, cykliczne i nieregularne. Rynek żyta, to rynek produktu wytwarzanego sezonowo, ale o okresie przechowywania dłuższym niż jeden sezon, co wpływa na okresowe zmiany cen, na które nakładają się zmiany koniunkturalne. Przedmiotem badań były ceny żyta w odstopniowaniu miesięcznym za lata 2010-2018 ze Zintegrowanego Systemu Rolniczej Informacji. W analizowanym okresie cena nominalna żyta wzrosła ponaddwukrotnie – z poziomu 327 zł za tonę w styczniu 2010 roku do 719 zł za tonę w grudniu 2018 roku. Współczynnik zmienności cen żyta wynosił od 4,0 do 27,2%. Dekompozycja szeregu czasowego cen wskazuje na występowanie zarówno wahań sezonowych, jak i cyklicznych oraz nieregularnych. Amplituda wahań sezonowych wynosiła średnio 14%, najwyższe ceny były w czerwcu (105%), a najniższe w sierpniu (91%). W skali roku zmiany cykliczne stanowiły średnio 71,2%, sezonowe – 17,9%, a nieregularne – 10,9% ogólnej zmienności cen żyta. Produkcja żyta systematycznie spada zarówno na świecie, jak i w Polsce.
    Źródło:
    Annals of The Polish Association of Agricultural and Agribusiness Economists; 2019, 21, 4; 533-541
    2657-781X
    2657-7828
    Pojawia się w:
    Annals of The Polish Association of Agricultural and Agribusiness Economists
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The occurrence and activity of sulphate-reducing bacteria in the bottom sediments of the Gulf of Gdańsk
    Autorzy:
    Mudryk, Z.J.
    Podgorska, B.
    Ameryk, A.
    Bolalek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48557.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    concentration
    seasonal fluctuation
    Baltic Sea
    hydrogen sulphide
    sediment
    Gdansk Gulf
    sulphate-reducing bacteria
    bottom sediment
    Opis:
    The paper presents the results of investigations concerning the number, distribution and physiological activity of sulphate-reducing bacteria (SRB) inhabiting the bottom sediments of the Gulf of Gdańsk. The numbers of this group of bacteria range between 0.76 × 103 and 1.27 × 104 cells per g wet sediment. The bacterial sulphate reduction rate in bottom sediments of this area of the Baltic Sea varies from 1.89 to 31.6 nM SO2− 4 g−1 24 h−1. The numbers of SRB and their physiological activity were subject to considerable seasonal fluctuations, maximum values being noted in summer (June) and minima in spring (April). A direct relationship has been found between the number of SRB and hydrogen sulphide concentrations; there is, however, no such relationship with reference to sulphate concentrations. The numbers and distributions of SRB demonstrated considerable variation in a depth profile of bottom sediments. SRB inhabiting the bottom sediments of the Gulf of Gdańsk were able to use three different organic substrates (lactate, acetate, propionate) as electron donors and as carbon and energy sources.
    Źródło:
    Oceanologia; 2000, 42, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unravelling the spatio-temporal variation of zooplankton community from the river Matla in the Sundarbans Estuarine System, India
    Autorzy:
    Nandy, T.
    Mandal, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079187.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    zooplankton
    Copepoda
    bioindicator
    spatio-temporal variability
    ecosystem functioning
    seasonal fluctuation
    estuarine water
    Indian Sundarban
    hydrographic change
    Opis:
    Zooplankton is an important bioindicator of ecosystem functioning. Knowledge of the seasonal fluctuation in the zooplankton population in estuarine waters of the Indian Sundarbans is rather limited. In the present study, we analysed the community structure of zooplankton assemblages and their spatio-temporal variations based on different multivariate statistics and indicator value analysis. A total of 56 taxa were identified and the density was primarily dominated by planktonic copepods and few meroplankton communities during four sampling seasons. The most abundant species were: Acartia spinicauda, Acartia sp., Bestiolina similis, Euterpina acutifrons, Labidocera acuta, Paracalanus aculeatus, Paracalanus parvus and Paracalanus indicus. Canonical Correspondence Analysis highlighted that temperature, pH, DO, salinity and nutrients were the prevailing environmental parameters associated with significant spatio-temporal changes of zooplankton distribution in this area. The highest abundance of zooplankton was recorded in winter, followed by monsoon, summer and spring. Throughout the study period, different zooplankton indices were observed in good condition. Seasonal occurrence of dominant zooplankton with high IndVal index was markedly observed and it might be used as a potential bioindicator for a particular season and environmental condition in this estuarine complex. The results of this study provide evidence for the presence of warm water species in the estuarine waters of the Indian Sundarbans and can be a clear indication of climate change-mediated elevated temperature in the estuarine system. Our results underscore the high diversity of zooplankton from mangrove dominated estuarine complex and emphasize the need for long-term monitoring in ecologically fragile ecosystems like the Sundarbans Estuarine System.
    Źródło:
    Oceanologia; 2020, 62, 3; 326-346
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occurrence of two-spotted spider mite (Tetranychus urticae Koch) on Potentilla fruticosa cultivars
    Autorzy:
    Szafranek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Ogrodnictwa
    Tematy:
    Potentilla fruticosa
    spider mite
    population dynamics
    two-spotted spider mite
    Tetranychus urticae
    Acari
    Tetranychidae
    seasonal fluctuation
    Źródło:
    Journal of Horticultural Research; 2016, 24, 2; 25-30
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal fluxes of phosphate across the sediment-water interface in Edku Lagoon, Egypt
    Autorzy:
    Khalil, M.K.
    Rifaat, A.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/48738.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phosphorus
    geochemical process
    modelling
    coastal lagoon
    Edku Lagoon
    Egypt
    eutrophication
    sediment water
    bottom water
    chemical property
    seasonal fluctuation
    Źródło:
    Oceanologia; 2013, 55, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An assessment of nutrient conditions in the Southern Baltic Sea between 1994 and 1998
    Autorzy:
    Lysiak-Pastuszak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/48336.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    organic matter
    fluctuation
    nutrient
    periodic assessment
    chemical factor
    seasonal fluctuation
    Baltic Sea
    ecosystem
    Gdansk Gulf
    hydrological factor
    temporal variation
    long-term trend
    Opis:
    Temporal variations (1994–98) in nutrient distribution were analysed in the Polish sector of the Baltic Sea with reference to long-term (1979–98) fluctuations of hydrological and chemical factors. Between 1994 and 1998 the winter accumulation of phosphate declined noticeably in most of the regions with the exception of the Gulf of Gdańsk. The winter peaks of silicate were also reduced in the offshore region and in the waters along the central Polish coast, but continued to accumulate in the bays owing to riverine input. In the offshore region a decrease in the winter accumulation of nitrate was noted in the surface water layer whereas in the bays nitrate concentrations continued to increase. Large quantities of nitrate continue to accumulate in the Gulf of Gdańsk, although at a slower rate than in 1979–93.
    Źródło:
    Oceanologia; 2000, 42, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wahania sezonowe w zawartości hemoglobiny we krwi u dzieci szkolnych
    Sezonnye kolebanija kolichestva gemoglobina v krovi detejj shkolnogo vozrasta
    The seasonal variatons of hemoglobin content in the blood of school children
    Autorzy:
    Zahorska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/876628.pdf
    Data publikacji:
    1950
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    dzieci szkolne
    badania
    wiek
    plec
    poziom hemoglobiny
    wahania sezonowe
    wiosna
    jesien
    niedobor witamin
    school child
    research
    age
    sex
    hemoglobin level
    seasonal fluctuation
    spring
    autumn
    vitamin deficiency
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 1950, 01, 3-4
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal dynamics of: the pea aphid, Acyrthosiphon pisum (Harris), its natural enemies the seven spotted lady beetle Coccinella septempunctata Linnaeus and variegated lady beetle Hippodamia variegata Goeze, and their parasitoid Dinocampus coccinellae (Schrank)
    Autorzy:
    Soleimani, S.
    Madadi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/66261.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    seasonal dynamics
    pea aphid
    Acyrthosiphon pisum
    natural enemy
    lady beetle zob.ladybird
    ladybug zob.ladybird
    ladybird
    ladybird beetle zob.ladybird
    Coccinella septempunctata
    variegated lady beetle
    Hippodamia variegata
    parasitoid
    Dinocampus coccinellae
    population fluctuation
    Opis:
    Two important lady beetle species commonly found in alfalfa fields in Iran are the variegated lady beetle Hippodamia variegata Goeze and the seven spotted lady beetle Coccinella septempunctata (Linnaeus, 1758) (Coleoptera: Coccinellidae). These two species attack many aphid species including the pea aphid, Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae). In this study, the seasonal population changes of A. pisum, H. variegata, C. septempunctata and the parasitoid, Dinocampus coccinellae (Schrank) (Hymenoptera: Braconidae) were studied in alfalfa fields in the 2012 and 2013 seasonal periods. The highest ladybird densities were noted on July 5, 2012 and on September 6, 2013 (17.2±2.8 and 13.4±1.6) individuals per 20 sweeps, respectively. Parasitism rates by D. coccinellae ranged from approximately 3 to 6% in two subsequent years, respectively. Parasitism was higher early in the growing season. Most parasitised ladybirds were females. There was no significant relationship between the temperature and relative humidity with pea aphid populations, although the aphid populations declined during the hot summer period. In contrast, the relationship between temperature and the H. variegata population was significant and positive in both years of the study. It has been shown that these lady beetle species have a major role in reducing the pea aphid populations in alfalfa fields. Due to the relatively low percentage of field parasitism by D. coccinellae, this parasite might not reduce the biocontrol efficiency of lady beetle species.
    Źródło:
    Journal of Plant Protection Research; 2015, 55, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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