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Wyszukujesz frazę "temporal distribution" wg kryterium: Temat


Tytuł:
Good Reasons and Guidance for Mapping Planktonic Protist Distributions
Autorzy:
Bulit, Celia
Tematy:
Patchiness, spatio-temporal distribution, geostatistics, planktonic ciliate
Pokaż więcej
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/763553.pdf  Link otwiera się w nowym oknie
Opis:
Analysing the spatio-temporal distribution of protistan microplankton has faced both conceptual and technical difficulties. However, recognition of a need to study planktonic patchiness, application of a major geology-based methodology (geostatistics) to ecology, and advances in computational technologies have widened the interest in this topic and made it more assessable. This review provides methodological and conceptual guidance on the application of geostatistics to microplankton analysis, using ciliates as example model organisms. Applying geostatistical analysis (and complementary methodologies) to the distribution of ciliate and phytoplankton reveals that attributes of their populations and assemblages (e.g. abundance, biomass, production, diversity) are patchily distributed at multiple spatial-scales in different aquatic environments, and these change over time. Data examined from several environments and scales exhibit distinct patterns of patches regarding their shape, density, and structure; these data can then be used to suggest a behavioural niche-separation of ciliates and the influence of patchiness on the rate processes of food webs. Throughout the review, basic guidance is provided for interpreting where, when, and why planktonic ciliate are so distributed, and directions for work on patchiness is offered, including a guide to the main literature on the topic. This should, therefore, be a useful stepping-stone for researchers interested in the impact of patchiness on protistan ecology, regardless of the environment.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal characteristics of nutrient and nutrient structure in the Yangtze River estuary
Autorzy:
Li, Lei
Xv, Guodong
Zheng, Yingjie
Jiang, Mei
Tematy:
Yangtze River estuary
nutrient
spatial distribution
temporal distribution
trophic structure
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Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/27311574.pdf  Link otwiera się w nowym oknie
Opis:
This data article aimed to evaluate the influencing mechanisms of the nutrients and the level of eutrophication in the Yangtze River estuary. The seasonal characteristics of nutrients (dissolved inorganic nitrogen (DIN), SiO3-2–Si, and PO43-P) in the seawater of the Yangtze River estuary were analyzed by conducting surveys in spring and summer of 2019. The findings revealed that the concentrations of all nutrient at the surface and bottom layers were lower in spring compared to summer. NO3–N was typically the major form of DIN. Runoff was identified as the primary source of DIN and SiO32−–Si, while PO43−–P originated from a various sources. The SiO32−–Si, while PO43−–P values in the surface and bottom layers during the spring and summer were higher than the Redfield values, indicating an imbalanced nutrient distribution. Furthermore, discrepancies were observed in the distributions of DIN/PO43−–P, SiO32−–Si/DIN, and SiO32−–Si/PO43−–P in the Yangtze River estuary. Through an examination of the ratio of DIN/PO43−–P absorbed by phytoplankton, PO43−–P was identified as a potential limiting factor for nutrition in the sea area of the Yangtze River estuary during spring and summer. The Eutrophication Index (E) values for both spring and summer were found to be higher than the eutrophication threshold, indicating severe eutrophication in the studied sea area.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution Patterns of Ambient Air Quality Pre- and During Pandemic in the Urban Area of Yogyakarta, Indonesia
Autorzy:
Brontowiyono, Widodo
Sihayuardhi, Ergiansyah Reezqiana
Maziya, Fina Binazir
Hakim, Luqman
Tematy:
ambient air quality
spatio-temporal distribution
inverse distance weight
urban
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Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:
https://bibliotekanauki.pl/articles/2202179.pdf  Link otwiera się w nowym oknie
Opis:
This study identified the spatial distribution pattern of the ambient air quality in the Yogyakarta Urban Area. It was performed to determine the distribution pattern of SO2, CO, and NO2 concentrations for 2016–2019 (pre-pandemic) and 2020 (during pandemic). Furthermore, the spatial analysis was performed using the Inverse Distance Weighting interpolation method. This study proved that spatial modeling using this method has good accuracy, and it is easier to map the distribution pattern of ambient air quality. In 2020, most of the locations met the quality standard (62.64%). As a result, the SO2 and CO parameters immediately showed that most conditions are satisfactory. In 2016, the SO2 parameters met the quality standards at 74.24% of locations. In 2020, the number increased to 85.71%. In addition, the CO parameter reached the quality standard at 81.82% of locations in 2016 and a perfect level of 100% in 2020. This occurred due to the effects of the COVID-19 pandemic because most human and business activities decreased drastically. Therefore, all studies can be used as the basis for air quality modeling and post-COVID-19 predictions. This study is also important as a policy material in the monitoring and management system of ambient air quality in urban areas.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and temporal distribution of heavy metals in coastal core sediments from the Red Sea, Saudi Arabia
Autorzy:
Al-Mur, B.A.
Quicksall, A.N.
Al-Ansari, A.M.A.
Tematy:
Red Sea
Saudi Arabia
heavy metal
spatial distribution
temporal distribution
pollution
coastal sediment
sediment core
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Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/48599.pdf  Link otwiera się w nowym oknie
Opis:
Jeddah is the most industrialized city on the west coast of Saudi Arabia and is under increasing influence of human activities. Heavy metals data were obtained from four near-coast Red Sea sediment cores in close proximity to Jeddah. Chromium, manganese, iron, copper, zinc, and lead were analyzed from depth-resolved sections of each core via heavy acid digestion and inductively coupled plasma-mass spectrometry (ICP-MS). The average concentrations of all four sites were 245.96 mg kg1, 478.45 mg kg1, 8506.13 mg kg1, 251.82 mg kg1, 623.09 mg kg1, and 362.75 mg kg1, respectively. The depth-resolved results showed that highest concentrations of Mn, Cu, and Pb were found in the top 15 cm of the core profile distributions compared to other depth sub-samples. Heavy metal concentrations in core sediments are increased near central Jeddah and have become higher in recent years. The results of enrichment factor calculations indicate little anthropogenic supply of Mn and Cr while Pb, Zn, and Cu show strong anthropogenic input. The Pollution Load Index was higher in the two sites closer to central Jeddah where power and desalination plants and wastewater release are known. This indicates that the area has suffered from heavy metal pollution compared to other non-industrialized sites in the Red Sea. Heavy metal contaminations due to anthropogenic activity should be taken into account to protect the Red Sea during future growth. The results of this work should be considered as a baseline for heavy metals monitoring in the sediments of the Red Sea coast near Jeddah, Saudi Arabia.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reproductive cycle and the related spatial and temporal distribution of the ninespine stickleback (Pungitius pungitius L.) in Puck Bay
Autorzy:
Sokolowska, E.
Skora, K.E.
Tematy:
Pungitius pungitius
ninespine stickleback
reproductive cycle
temporal distribution
Puck Bay
breeding period
spawning
spatial distribution
maturity stage
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Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/48433.pdf  Link otwiera się w nowym oknie
Opis:
The cycle of gonad development and related changes in the length structure and spatial-temporal distribution of ninespine sticklebacks (Pungitius pungitius L.) in Puck Bay were studied. Observations were carried out in the shallow shore zones, as well as in the deeper epipelagic zone of the Bay. Ninespine sticklebacks reproduce in the brackish environment of Puck Bay, breeding in its warmer, inshore zones. Reproduction takes place in the spring and summer months, from April to July. One female spawns several clutches of eggs during one breeding season. The average length of ninespine sticklebacks in Puck Bay was about 40 mm, and the sex ratio in the population was close to 1:1. However, both length structure and sex ratio were subject to local and periodic variations, resulting from possible breeding-related territorial divisions. Higher gonadosomatic indices in females in early spring represented the transition of fish to the advanced vitelligenous phase. The lowest GSI of males during the breeding season indicated the termination of spermatogenesis. The completion of spawning in August started a new process of gonad restoration to prepare the fish for the next breeding season.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Home range dynamics and habitat selection by roe deer in a boreal area in central Sweden
Autorzy:
Cederlund, G.
Powiązania:
Acta Theriologica
Opis:
This study describes spatial and temporal ditribution of roe deer (Capreolus capreolus Linnaeus, 1758) in south central Sweden expressed as by home-range dynamics and habitat preference during the course of the year. Roe deer were monitored by telemetry at least one day a week during 1975 to 1977.
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka
Tytuł:
On the Temporal Variability of Air Pollutants’ Emissions – Case Study of Residential PM10 Emission in Silesian Metropolis
Autorzy:
Zasina, Damian
Zawadzki, Jarosław
Tematy:
air pollution
emission inventory
particulate matter
PM10
temporal distribution
zanieczyszczenie powietrza
inwentaryzacja emisji
pył zawieszony
rozkład czasowy
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Wydawca:
STE GROUP
Powiązania:
https://bibliotekanauki.pl/articles/2064290.pdf  Link otwiera się w nowym oknie
Opis:
The paper summarizes previous studies associated with carrying out of the air pollutant emission inventories. There are presented three approaches for obtaining monthly distribution of PM10 air emission: using expert’s judgement, modelling of the heating demand, and temporal disaggregation using the heating degree days (HDD). However some differences due to not considering hot water demand, it can be effectively used for obtaining temporal, and spatiotemporal distributions of air pollutants’ air emissions necessary for air quality modelling.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-temporal distribution of wildlife–vehicle collisions in the Polish Carpathians between 2015 and 2021
Czasowo -przestrzenne rozmieszczenie zdarzeń drogowych z udziałem zwierząt na terenie Karpat Polskich w latach 2015 – 2021
Autorzy:
Haska, Wojciech
Opis:
Problem zdarzeń drogowych z udziałem zwierząt jest powszechnym problemem w polskiej części Karpat. W ostatnich latach na obszarze całej Polski dochodzi do coraz większej ich liczby. W wyniku tego zdrowie i życie tracą setki ludzi i dziesiątki tysięcy zwierząt, co ma również znaczący, negatywny wpływ na środowisko przyrodnicze. W poniższej pracy przeprowadzono analizę oraz sporządzono charakterystykę poszczególnych czynników wpływających na zwiększenie ryzyka kolizji pojazdów ze zwierzętami, a także opracowano ich czasowe i przestrzenne rozmieszczenie w latach 2015-2021. Jako czynniki w największym stopniu wpływające na ryzyko wystąpienia zdarzeń drogowych z udziałem zwierzyny wskazano: natężenie ruchu na danej drodze, warunki oświetleniowe oraz doświadczenie i wiek kierującego pojazdem. Do dużej liczby kolizji dochodziło w największych miastach, co ma związek z bardzo dużym zagęszczeniem sieci drogowej w ich granicach. Największą liczbę kolizji przypadającą na kilometr drogi odnotowano w gminach położonych w północnej części polskich Karpat, a także we wschodniej części województwa podkarpackiego oraz na obszarach pogranicza województw śląskiego i małopolskiego. Pod względem czasowym, do największej liczby kolizji, dochodzi w dwóch szczytach: porannym i wieczornym, w ciągu tygodnia podczas weekendów (sobota do poniedziałku), a podczas całego roku w okresie wiosennym i jesiennym.
The problem of wildlife-vehicle collision (WVCs) is common in the Polish Carpathians. In the following years, their number increases throughout Poland. As a result, hundreds of people and tens of thousands of animals are losing their health and lives. It is a significant negative impact on the natural environment. In the following work, the analysis of individual factors influencing the increased risk of collisions between vehicles and animals was carried out, and their spatial and temporal distribution was developed. The following factors were indicated as factors affecting the risk of road incidents with the participation of animals to the greatest extent: traffic intensity of Carpathians roads, lighting conditions as well as experience and age of the vehicle driver. The greatest number of collisions took place in the largest cities, which is related to the very high density of the road network within their borders. The highest number of collisions per kilometer of road was recorded in communes located in the northern part of the Polish Carpathians, as well as in the eastern part of the Podkarpackie Voivodeship and in the border areas of the Śląskie and Małopolskie voivodships. In temporal analyses, the highest number of collisions occurs in two peaks: morning and evening, especially during weekends (Saturday to Monday). Most of the collisions also occurred during the spring and autumn.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne

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