scholarly journals Climate change and lake water resources in Sub-Saharan Africa: case study of lake Chad and lake Victoria

2017 ◽  
Vol 36 (2) ◽  
pp. 648
Author(s):  
D. A. Yunana ◽  
A. A. Shittu ◽  
S. Ayuba ◽  
E. J. Bassah ◽  
W. K. Joshua
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Lake Water ◽  
Lake Victoria ◽  
Sub Saharan Africa ◽  
Lake Chad ◽  
Sub Saharan

scholarly journals First insights into past biodiversity of giraffes based on mitochondrial sequences from museum specimens

2020 ◽  
Author(s):  
Alice Petzold ◽  
Anne-Sophie Magnant ◽  
David Edderai ◽  
Bertrand Chardonnet ◽  
Jacques Rigoulet ◽  
...  
Keyword(s):  
Lake Victoria ◽  
Molecular Dating ◽  
Sub Saharan Africa ◽  
Museum Specimens ◽  
New Classification ◽  
Lake Chad ◽  
Phylogeographic Analysis ◽  
Mitochondrial Sequences ◽  
Sub Saharan

Intensified exploration of sub-Saharan Africa during the 18th and 19th centuries led to many newly described giraffe subspecies. Several populations described at that time are now extinct, which is problematic for a full understanding of giraffe taxonomy. In this study, we provide mitochondrial sequences for 41 giraffes, including 19 museum specimens of high importance to resolve giraffe taxonomy, such as Zarafa from Sennar and two giraffes from Abyssinia (subspecies camelopardalis), three of the first southern individuals collected by Levaillant and Delalande (subspecies capensis), topotypes of the former subspecies congoensis and cottoni, and giraffes from an extinct population in Senegal. Our phylogeographic analysis shows that no representative of the nominate subspecies camelopardalis was included in previous molecular studies, as Zarafa and two other specimens assigned to this taxon are characterized by a divergent haplogroup, that the former subspecies congoensis and cottoni should be treated as synonyms of antiquorum, and that the subspecies angolensis and capensis should be synonymized with giraffa, whereas the subspecies wardi should be rehabilitated. In addition, we found evidence for the existence of a previously unknown subspecies from Senegal (newly described in this study), which is now extinct. Based on these results, we propose a new classification of giraffes recognizing three species and 10 subspecies. According to our molecular dating estimates, the divergence among these taxa has been promoted by Pleistocene climatic changes resulting in either savannah expansion or the development of hydrographical networks (Zambezi, Nile, Lake Chad, Lake Victoria).

scholarly journals Mudanças climáticas, segurança humana e atores não-estatais violentos: o Boko Haram na região do lago Chade

2020 ◽  
Vol 8 (3) ◽  
pp. 499-524
Author(s):  
Marcos Alan S. V. Ferreira ◽  
Max Sarney A. Silva ◽  
Iure Paiva
Keyword(s):  
Climate Change ◽  
Human Security ◽  
Case Analysis ◽  
Extreme Drought ◽  
Security Risks ◽  
Boko Haram ◽  
Lake Chad ◽  
State Actors ◽  
Sub Saharan

O presente trabalho introduz o debate sobre como as mudanças climáticas, principalmente através da intensificação de situações climáticas extremas, são capazes de potencializar riscos à segurança. Particularmente, o estudo procura analisar a dinâmica entre as mudanças climáticas e o surgimento e ampliação de conflitos, assim como a insurgência de atores não-estatais violentos (ANEVs). Em especial, analisou-se o caso da região Subsaariana do Lago Chade, a qual enfrenta problemas ligados à seca extrema e a expansão de ANEVs, em especial o avanço do Boko Haram na Nigéria. O estudo de caso demonstra que as mudanças climáticas, ainda que de forma indireta, são capazes de influenciar tanto na potencialização de conflitos como no aumento da ação dos ANEVs, sobretudo reduzindo as chances dos habitantes da região em lidar com a precariedade da situação, tornando-a ainda mais tensa quando associada a outras fragilidades socioeconômicas e políticas já existentes na região.   Abstract: This paper aims to introduce the debate on how climate change, especially through the intensification of extreme climatic situations, is capable of enhancing security risks, particularly in the emergence and expansion of conflicts conducted by violent non-state actors (VNSAs). In particular, it presents a case study about the sub-Saharan region of Lake Chad, which faces problems related to the extreme drought and the expansion of VNSAs, especially the rise of Boko Haram in Nigeria. Our case analysis demonstrates that climate change, although indirectly, is capable of influencing both the potentialization of conflicts and the increase of the action of ANEVs, especially when associated with other socioeconomic fragilities and existing policies in a region. Keywords: Climate Change; Human Security; Violent Non-State Actors; Lake Chad; Boko Haram.     Recebido em: março/2019. Aprovado em: outubro/2019.

Secondary Education in Sub-Saharan Africa Teacher Preparation Deployment and Support Case Study Uganda

2019 ◽  
Author(s):  
Charlotte Oloya Oloya ◽  
Emma Broadbent Broadbent ◽  
Jacklyn Makaaru Arinaitwe Arinaitwe ◽  
Nick Taylor Taylor
Keyword(s):  
Secondary Education ◽  
Teacher Preparation ◽  
Sub Saharan Africa ◽  
Sub Saharan

Green Sukuk, Energy Poverty, and Climate Change: A Roadmap for Sub-Saharan Africa

2018 ◽  
Author(s):  
Dalal Aassouli ◽  
Mehmet Asutay ◽  
Mahmoud Mohieldin ◽  
Tochukwu Chiara Nwokike
Keyword(s):  
Climate Change ◽  
Sub Saharan Africa ◽  
Energy Poverty ◽  
Sub Saharan

Managing African Urbanization in the Context of Environmental Change

2014 ◽  
Vol 2 (2) ◽  
Author(s):  
Shuaib Lwasa
Keyword(s):  
Climate Change ◽  
Economic Growth ◽  
Social Services ◽  
Urban Areas ◽  
Urban Governance ◽  
Sub Saharan Africa ◽  
African Countries ◽  
Sub Saharan ◽  
Urbanization Rate ◽  
Development And Management

Africa’s urbanization rate has increased steadily over the past three decades and is reported to be faster than in any other region in the world . It is estimated that by 2030, over half of the African population will be living in urban areas . But the nature of Africa’s urbanization and subsequent form of cities is yet to be critically analyzed in the context of city authorities’ readiness to address the challenges . Evidence is also suggesting that urbanization in African countries is increasingly associated with the high economic growth that has been observed in the last two decades . Both underlying and proximate drivers are responsible for the urbanization, and these include population dynamics, economic growth, legislative designation, increasing densities in rural centers, as well as the growth of mega cities such as Lagos, Cairo and Kinshasa, that are extending to form urban corridors . With the opportunities of urbanization in Sub–Saharan Africa, there are also challenges in the development and management of these cities . Those challenges include provision of social services, sustainable economic development, housing development, urban governance, spatial development guidance and environmental management, climate change adaptation, mitigation and disaster risk reduction . The challenge involves dealing with the development and infrastructure deficit, in addition to required adaption to and mitigation of climate change . This paper examines the current state of urban management in Africa .

Sign in / Sign up

Export Citation Format

Share Document