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    Wyświetlanie 1-3 z 3
    Tytuł:
    The Late Quaternary vegetational and environmental history of western tropical Africa - the eastern Benin Basin, Lagos, Nigeria
    Autorzy:
    Adeonipekun, P. A.
    Adeniyi, T. A.
    Mateawo, J.
    Agbalaya, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/184322.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    paleoclimate
    paleoecology
    paleovegetation
    palynology
    sedimentology
    Lagos Coastal Area
    Late Quaternary
    Opis:
    A palynological study of a 30 m borehole within the Akoka campus of the University of Lagos, Akoka, Nigeria revealed Late Quaternary paleo-vegetational, climatic and environmental changes. Sixteen samples at a regular interval of 2 m were subjected to standard palynological and sedimentological techniques. Six pollen zones representing six paleoclimatic phases within the Late Quaternary period were recognized. The age model is based on two radiocarbon dates (6 m: 5,495 ± 25 ¹⁴C yr and 12 m: 15,660 ± 40 ¹⁴C yr) and, by extrapolation, the sequence spans approximately the last 35,000 yr BP. The African maximum transgression and the African Humid Period (wet paleoclimate maximum) – the Nouaktchottian, and Pre-Nouaktchottian respectively – were recognized, while the Ogolian II (Erg II) was stratigraphically recognized and the Upper Inchirian extrapolated. Recovered diatom frustules with other proxies were employed for paleoclimatic and paleoecological deductions. Four hydrological cycles and three paleoecological settings were identified. Results from this work indicate the co-eval record of paleoclimatic events across Africa, suspected cooling during the African maximum transgression in Nigeria and the usefulness of coastal freshwater swamp sediments for paleoclimate studies.
    Źródło:
    Geology, Geophysics and Environment; 2017, 43, 4; 277-291
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phytoplankton Diversity and Abundance in Relation to Physico-chemical Parameters of Ifewara Reservoir, Southwestern Nigeria
    Autorzy:
    Hameed, I. O.
    Adeniyi, I. F.
    Adesakin, T. A.
    Aduwo, A. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076734.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Phytoplankton abundance
    distribution
    diversity
    physico-chemical parameter
    Opis:
    The phytoplankton abundance and physico-chemical parameters of Ifewara Reservoir, Southwestern Nigeria was studied for four months (February to December, 2015). Four sampling stations (designated Stations 1-4) were established along the horizontal axis of the reservoir - from inflow region to the dam site end. At each station, net plankton samples were collected by sieving 30 litres of water through a plankton net of 50 µm mesh size into 30 ml concentrate volume. These were then preserved in 5% formalin solution and later treated with Lugol’s solution and reduced to 3 ml for microscope observation. The results of the physico-chemical parameters showed that some were above recommended limits of the National Environmental Standards and Regulations Enforcement Agencies (NESREA) for drinking water and aquatic life. Sixty-nine (69) species of phytoplankton were recorded from the four investigated sampling stations. The abundance of phytoplankton was in the following order; Bacillariophyceae (90.84%) > Chlorophyceae (44.67%) > Cyanophyceae (10.69%) > Charophyceae (0.31%) > Euglenophyceae (0.12%) > Dinophyceae (0.06%) > Chrysophyceae (0.03%). The most abundant phytoplankton species was Fragilaria aceania, accounting for 74.28% of the total, followed by Cosmarium quadrum (13.04%), Rhizoclonium hieroglyphicum (11.97%) and Oscillatoria tenuis (8.03%). With regard to the horizontal pattern of variation along the reservoir, the highest phytoplankton abundance was recorded at the inflow basin and the lowest abundance at the dam site. Almost all the phytoplankton groups also had their highest mean abundance during the rainy season rather then during the dry season.
    Źródło:
    World News of Natural Sciences; 2019, 24; 250-267
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    African states and conflicts: a study of Northern Zone of Plateau State
    Autorzy:
    Nwan, Moses
    Shaibu, Moses Etila
    Adegoke, Adeniyi T.
    Powiązania:
    https://bibliotekanauki.pl/articles/42944528.pdf
    Data publikacji:
    2024-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Africa
    Conflict
    War
    Ethnicity
    Religion
    Herder
    Farmer
    Opis:
    Since the 1960s, African states have passed through different conflicts with reasons such as politics, ethnic, religious, and resource-based conflicts such as border or land disputes, and several other causes. The Northern Senatorial zone of Plateau State, Nigeria has witnessed several violent conflicts between 2001 and 2023 with several scholars assessing the immediate causes and its impact without looking at the remote causes. This study examines the history of conflicts in the Northern Plateau Senatorial zone and its persistent nature with its root causes. The study adopted history research method, which comprised primary and secondary sources. Data was obtained by the researcher from oral interviews in the Jos metropolis and across Plateau North. Also, books and Journals from the University of Jos and the National Library Jos branch provided quality data. The conflict in the Northern Plateau comprising five out of the six local council areas evolved from instances of clashes and skirmishes as a result of spontaneous ethnic and religious provocations and reactions to planned attacks between Christians and Muslins in Jos North and South starting from 2001, guerilla-style reprisals, cattle rustling, herder/farmer clashes across Bassa, Riyom and Barkin Ladi LGAs. The study found out that the root cause of conflicts in the Northern Plateau was the British colonial policies of the 1900s, which led to the massive influx of immigrants that settled permanently in Jos North and South, Barkin Ladi, Riyom and Bassa LGAs. The study discovers that the conflict in Northern Plateau has led to pervasive insecurity of lives and property, as evidenced by the spate of cattle rustling, armed robbery attacks, assassinations, and ethnic and religious feuds coupled with the seeming helplessness of security agencies to handle criminal attacks on civilian populations in Riyom, Barkin Ladi and Bassa LGAs. The study recommends that security can be secure if freedom and justice are allowed to reign through arresting perpetrators and punishing them severely, allowing freedom of economic, political and social participation for all citizens of Plateau State without ethnic or religious discrimination.
    Źródło:
    Reality of Politics; 2024, 28; 72-97
    2082-3959
    Pojawia się w:
    Reality of Politics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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