22 Years Characterized Trends of Rainfall in Abeokuta, Nigeria

Obot, Nsikan I.; Emberga, Terhemba T.; Ishola, K. S.

doi:10.3923/rjasci.2011.264.271

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…Ogun state climate follows a tropical pattern with the rainy season starting from March and ending in November, followed by dry season. The mean annual rainfall varies from 128 cm in the southern parts of the state to 105 cm in the northern areas [32]. The average monthly temperature ranges from 23°C in July to 32°C in February.…”

Section: Study Areasmentioning

confidence: 99%

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Presence of Bluetongue Virus Antibodies in Cattle and Sheep in Ogun and Osun States, Nigeria

Oladimeji

Kelechi

2019

IJTDH

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Bluetongue is an infectious, arthropod-borne viral disease principally affecting ruminants. The occurrence of bluetongue virus (BTV) antibodies in sheep and cattle from backyard farms, cattle markets and abattoirs in Ogun and Osun states of Nigeria was investigated. Three hundred and forty (340) plasma samples comprising 205 from sheep and 135 from cattle were collected from March to September 2017, noting the sex, breed and age of the animals. The samples were screened with a commercial enzyme-linked immunosurbent assay (ELISA) kit that detects BTV antibodies in ruminant plasma or serum. All cattle tested from both states were positive for BTV antibodies giving a seroprevalence of 100% while 95% seroprevalence was obtained for sheep. In Ogun state, prevalence of 90.5% and 98% were obtained for male and female sheep respectively while 95.6% and 95% prevalence were also obtained for male and female sheep respectively in Osun state. Based on breed, 94%, 95%, 95% and 96% prevalence were obtained for Yankasa, Balami, Ouda and West African Dwarf (WAD) sheep respectively in Ogun state while 93%, 95.5%, 100% and 93% prevalence were obtained for Yankasa, Balami, Ouda and WAD sheep respectively in Osun state. Furthermore, prevalence of 92% and 96.7% were obtained for age groups of ≤ 1 year and > 1 year respectively in Ogun state, while prevalence of 96% and 94.7% were obtained for age groups of ≤ 1 year and > 1 year respectively in Osun state. Since vaccination against bluetongue disease is not practiced in Nigeria, the detection of high prevalence of BTV antibodies observed in apparently healthy animals in this study indicates natural, albeit subclinical, infection with the virus and sustained activity of the Culicoides vector. These findings suggest that bluetongue is widespread in southwestern part of Nigeria and highlight the need for continuous surveillance of the disease in the country as well as isolation, identification and characterisation of currently circulating BTV strains in Nigeria.

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Section: Study Areasmentioning

confidence: 99%

“…The average monthly temperature ranges from 23°C in July to 32°C in February. The northern part of the state is mainly of derived Savannah vegetation, while the central part falls in the rain forest belt [32].…”

Section: Study Areasmentioning

confidence: 99%

Presence of Bluetongue Virus Antibodies in Cattle and Sheep in Ogun and Osun States, Nigeria

Oladimeji

Kelechi

2019

IJTDH

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“…Many studies have investigated rainfall trends and variability over the years in Nigeria, with most studies using tables and graphical plots to shed light on the dynamics of rainfall trends and variability over time (Adenodi 2018; Akinsanota & Ogunjobi 2014; Animashaun et al, 2020; Nnaji et al, 2016). In addition to this, some studies used time series analysis to investigate long fluctuation patterns in rainfall over an extended period (Ogbuene, 2010), while others used a non-parametric test to study rainfall trends in Nigeria (Obot et al, 2011). However, this study contributes to the existing literature by testing the convergence hypothesis in the context of rainfall variability, which offers a more precise understanding of rainfall variability and trends over time.…”

Section: Introductionmentioning

confidence: 99%

A Note on Rainfall Variability and Trends in Nigeria: Implications for Agricultural Production

Ogundari¹,

Ademuwagun

APPAH

2021

Studies in Microeconomics

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The climatic change crisis has led to a renewed interest in understanding the dynamic of climatic variability over time. This is because rainfall variability in response to climate change poses a severe threat to global food security and agricultural production in general. As a result of this, the study investigates the convergence of rainfall variability in Nigeria. We use historical climate data on annual rainfall collected from meteorological stations across 12 states and covering 1992–2013. This gives rise to a balanced panel data of 12 states and 20 periods, which yields 240 observations. The study used a sigma convergence hypothesis test estimated using ordinary least square, fixed-effect and feasible generalized least square models. The coefficient of variation is taken as a measure of rainfall variability in the study. The results showed a negative (declining) linear correlation between rainfall’s coefficient of variation and data year. This means that rainfall variability decreased over time. This indicates evidence of convergence of rainfall, which means states with lower average annual rainfall are catching up on states with higher average annual rainfall over time. And, from the agricultural production standpoint, this result shows that the potential threat of rainfall variability to food security is not severe. In addition, it indicates a decrease in risk and uncertainty in food crop production associated with rainfall variability. JEL Classifications: O13, O55, Q10, Q54

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“…Some studies based on statistical examination and climate model projections (Abiodun et al, 2011) have shown that changes in precipitation behaviour is already evident in Nigeria. In addition, other scientific interests in Nigeria range from studies examining rainfall anomalies (Olaniran, 1991(Olaniran, , 2002, to works analyzing rainfall trends and periodicities (Obot et al, 2011;Adefolalu, 1986;Ayoade, 1973;Ojo, 1990;Ezenwaji et al, 2014), to studies on rainy days (Olaniran, 1990;Omagbai, 2010a;Olaniran, 1984Olaniran, , 1987, seasonality (Adejuwon, 2012;Adefolalu, 1983;Adejuwon, 1990;Omagbai, 2010b), Onset, periodicities and reliability (Ilesanmi, 1972;Ayoade, 1974Ayoade, , 1975 and the trend of precipitation and annual water balance (Ojo, 1990).…”

Section: Introductionmentioning

confidence: 99%

Analysis of trends in rainfall and water balance characteristics of Awka, Nigeria

Nzoiwu¹,

Ezenwaji²,

Enete³

et al. 2017

J. Geogr. Reg. Plann.

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This paper analyses the trend in rainfall and water balance characteristics of Awka, Nigeria using the monthly rainfall data retrieved from the archives of the Nigeria Meteorological Agency in Lagos from 1976 to 2015. The tools employed for the study are linear regression analysis, cumulative sum (CUSUM) technique, Walter's cumulative index analysis and Thornthwaite's method. Rainfall was observed to have declined and generally below the climatological mean in the first decade, while from1988 to early 2000s, rainfall has maintained a steady rise. The length of rainy season has shown significant number of variations, but has recorded a general increase. The rainfall onset and cessation periods were predominantly March/April and October, respectively though significant changes in onset periods has been evident in the last 10 years with 6 out of the 10 having onset occurring in February. This study observed a reduction by one month in the periods of soil moisture utilization and increase by the same amount in the periods of soil moisture recharge. As a consequence, amount of water surplus has increased. However, this study provides explanation on the current state of rainfall in relation to climatic water budgeting for Awka and as such important for agricultural and water resource planning.

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22 Years Characterized Trends of Rainfall in Abeokuta, Nigeria

Cited by 8 publications

References 20 publications

Presence of Bluetongue Virus Antibodies in Cattle and Sheep in Ogun and Osun States, Nigeria

Presence of Bluetongue Virus Antibodies in Cattle and Sheep in Ogun and Osun States, Nigeria

A Note on Rainfall Variability and Trends in Nigeria: Implications for Agricultural Production

Analysis of trends in rainfall and water balance characteristics of Awka, Nigeria

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