MSUIR Collection:https://cris.library.msu.ac.zw//handle/11408/1582024-03-29T12:49:36Z2024-03-29T12:49:36ZHarnessing data science to improve integrated management of invasive pest species across Africa: An application to Fall armyworm (Spodoptera frugiperda) (J.E. Smith) (Insecta: Lepidoptera: Noctuidae)Ritter A. GuimapiSaliou NiassyBester Tawona MudereriElfatih M. Abdel-RahmanGhislain T. Tepa-YottoSevgan SubramanianSamira A. MohamedKarl H. ThunesEmily KimathiKomi Mensah AgbokaManuele TamòJean Claude RwaburindiBuyung HadiMaged ElkahkyMay-Guri SæthreYeneneh BelaynehSunday EkesiSegenet KelemuHenri E.Z. Tonnanghttps://cris.library.msu.ac.zw//handle/11408/54982023-03-29T06:57:21Z2022-02-10T00:00:00ZTitle: Harnessing data science to improve integrated management of invasive pest species across Africa: An application to Fall armyworm (Spodoptera frugiperda) (J.E. Smith) (Insecta: Lepidoptera: Noctuidae)
Authors: Ritter A. Guimapi; Saliou Niassy; Bester Tawona Mudereri; Elfatih M. Abdel-Rahman; Ghislain T. Tepa-Yotto; Sevgan Subramanian; Samira A. Mohamed; Karl H. Thunes; Emily Kimathi; Komi Mensah Agboka; Manuele Tamò; Jean Claude Rwaburindi; Buyung Hadi; Maged Elkahky; May-Guri Sæthre; Yeneneh Belayneh; Sunday Ekesi; Segenet Kelemu; Henri E.Z. Tonnang
Abstract: After five years of its first report on the African continent, Fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) is considered a major threat to maize, sorghum, and millet production in sub-Saharan Africa. Despite the rigorous work already conducted to reduce FAW prevalence, the dynamics and invasion mechanisms of FAW in Africa are still poorly understood. This study applied interdisciplinary tools, analytics, and algorithms on a FAW dataset with a spatial lens to provide insights and project the intensity of FAW infestation across Africa. The data collected between January 2018 and December 2020 in selected locations were matched with the monthly average data of the climatic and environmental variables. The multilevel analytics aimed to identify the key factors that influence the dynamics of spatial and temporal pest density and occurrence at a 2 km x 2 km grid resolution. The seasonal variations of the identified factors and dynamics were used to calibrate rule-based analytics employed to simulate the monthly densities and occurrence of the FAW for the years 2018, 2019, and 2020. Three FAW density level classes were inferred, i.e., low (0–10 FAW moth per trap), moderate (11–30 FAW moth per trap), and high (>30 FAW moth per trap). Results show that monthly density projections were sensitive to the type of FAW host vegetation and the seasonal variability of climatic factors. Moreover, the diversity in the climate patterns and cropping systems across the African sub-regions are considered the main drivers of FAW abundance and variation. An optimum overall accuracy of 53% was obtained across the three years and at a continental scale, however, a gradual increase in prediction accuracy was observed among the years, with 2020 predictions providing accuracies greater than 70%. Apart from the low amount of data in 2018 and 2019, the average level of accuracy obtained could also be explained by the non-inclusion of data related to certain key factors such as the influence of natural enemies (predators, parasitoids, and pathogens) into the analysis. Further detailed data on the occurrence and efficiency of FAW natural enemies in the region may help to complete the tri-trophic interactions between the host plants, pests, and beneficial organisms. Nevertheless, the tool developed in this study provides a framework for field monitoring of FAW in Africa that may be a basis for a future decision support system (DSS).
Description: Abstract2022-02-10T00:00:00ZRitter A. GuimapiSaliou NiassyBester Tawona MudereriElfatih M. Abdel-RahmanGhislain T. Tepa-YottoSevgan SubramanianSamira A. MohamedKarl H. ThunesEmily KimathiKomi Mensah AgbokaManuele TamòJean Claude RwaburindiBuyung HadiMaged ElkahkyMay-Guri SæthreYeneneh BelaynehSunday EkesiSegenet KelemuHenri E.Z. TonnangA comparison of lion home range sizes in two management blocks in a semi-arid savannah National Park of ZimbabweNgwenya, Mary MMkandhla, Naison MMuzvondiwa, John Vhttps://cris.library.msu.ac.zw//handle/11408/52052022-10-27T12:38:39Z2013-02-01T00:00:00ZTitle: A comparison of lion home range sizes in two management blocks in a semi-arid savannah National Park of Zimbabwe
Authors: Ngwenya, Mary M; Mkandhla, Naison M; Muzvondiwa, John V
Abstract: Abstract: A comparison of home range sizes of 4 collared lions, Panthera leo was carried out in two management blocks of Hwange
National Park during the wet season. Home range sizes and utilization distribution were determined. Female lions’ home ranges
significantly differed in the Main Camp and Ngamo Blocks (t-calculated= 3.37; 2d.f; t-critical= 2.92). Intersex variations in home
ranges were observed in the Main Camp block (t-calculated= 7.82; 2d.f; t-critical= 2.92). Lions spent most of the time inside the park but
some moved outside the park. Solitary lions encroached in human settlements more than prides and there were interactions between the
solitary male and female lions from Main Camp block. Main Camp lions had larger range sizes than Ngamo lions and males exhibited
larger ranges than females. The encroachment of lions into communal areas has important implications for park management and
human-wildlife conflict.2013-02-01T00:00:00ZNgwenya, Mary MMkandhla, Naison MMuzvondiwa, John VFish Abundance and Species Composition between Fished and Non-fished Areas of Lake Chivero, ZimbabweMuzvondiwa, John VChiwara, JosephNgwenya, Mary Mhttps://cris.library.msu.ac.zw//handle/11408/51982022-10-13T21:59:08Z2013-02-01T00:00:00ZTitle: Fish Abundance and Species Composition between Fished and Non-fished Areas of Lake Chivero, Zimbabwe
Authors: Muzvondiwa, John V; Chiwara, Joseph; Ngwenya, Mary M
Abstract: The main objectives of this study was to compare fish abundance, species composition and fish mean lengths between fished and non-fished (protected) area of Lake Chivero, Zimbabwe. Biological data (species, weight and length) for individual fish sample collected from fished and non fished areas using gillnets of different mesh sizes were recorded. Mean Catch per Unit Effort (CPUE), Species diversity (H'), species richness (S), species evenness and mean fish lengths were determined for each area. A total of eleven fish species from five fish families were caught during the entire study period. The findings revealed that there were significant differences in fish abundance between fished and non-fished areas (P< 0.005) and a non-significant difference in fish species composition and fish mean lengths between the two areas (P> 0.005). This suggests almost equal levels of resources exploitation and disturbances within the two areas or high levels of fish migration from protected areas to re-colonize depleted stocks in fished areas.2013-02-01T00:00:00ZMuzvondiwa, John VChiwara, JosephNgwenya, Mary MImpact of Agricultural activities on water quality in the Dufuya Dambos, Lower Gweru, ZimbabweMuzvondiwa, John VengaiGono, Robert KudzanayiSichewo, Petronillah Rudohttps://cris.library.msu.ac.zw//handle/11408/51972022-10-10T08:03:33Z2013-09-01T00:00:00ZTitle: Impact of Agricultural activities on water quality in the Dufuya Dambos, Lower Gweru, Zimbabwe
Authors: Muzvondiwa, John Vengai; Gono, Robert Kudzanayi; Sichewo, Petronillah Rudo
Abstract: Recently, concern over agricultural diffuse pollution sources in integrated water quality management has been growing.
High inorganic and organic fertilisers application rates may increase groundwater pollution and these effects were investigated in the
Dufuya Wetland (19 o 17’S; 29o
21’E) in Chief Sogwala area of Lower Gweru Communal Lands, approximately 42km west of the City of
Gweru, Zimbabwe. Forty-two (42) water samples were collected for analysis of pH, conductivity, calcium, nitrates, and phosphates
during the months of September, October, and November 2008. A questionnaire procedure was used for collection of manure
application rate, wetland and crop management data in the studied area. The results demonstrated that cattle manure in the Dufuya
wetland is applied at the rate of 30t/ha- 60t/ha per year. Groundwater and surface runoff water samples have pH, conductivity, calcium,
phosphates and nitrates levels within the WHO permissible guideline of 6.5-8.5, 1500μScm-1
, 200mg/l, 0.09mg/l and 10mg/l respectively.
The mean nitrate and phosphate concentrations in surface run-off water in the garden and the sponge are 0.00275mg/l, 0.0117mg/l and
0.00377mg/l, 0.00077mg/l respectively. Groundwater concentrations are 0.026mg/l, 0.0167mg/l and 0.0021mg/l, 0.00228mg/l for nitrates
and phosphates respectively. There was no significant difference in the mean concentrations of nitrates and phosphates in water
(ground/surface) in the sponge and the garden (P < 0.005). Fertiliser applications have no negative effects on dambo water quality.2013-09-01T00:00:00ZMuzvondiwa, John VengaiGono, Robert KudzanayiSichewo, Petronillah Rudo