Browsing by Author "Chavula, Geoffrey"

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    Decadal Trends and Common Dynamics of the BioOptical and Thermal Characteristics of the African Great Lakes
    (PLoS ONE, 2014) Steven, Loiselle; Andre´ s Co´ zar; Adgo, Enyew; Ballatore, Thomas; Chavula, Geoffrey; Jean, Pierre Descy; Harper, David M.; Kansiime, Frank; Kimirei, Ismael; Langenberg, Victor; Ronghua, Ma; Sarmento, Hugo; Odada, Eric
    The Great Lakes of East Africa are among the world’s most important freshwater ecosystems. Despite their importance in providing vital resources and ecosystem services, the impact of regional and global environmental drivers on this lacustrine system remains only partially understood. We make a systematic comparison of the dynamics of the bio-optical and thermal properties of thirteen of the largest African lakes between 2002 and 2011. Lake surface temperatures had a positive trend in all Great Lakes outside the latitude of 0° to 8° south, while the dynamics of those lakes within this latitude range were highly sensitive to global inter-annual climate drivers (i.e. El Niño Southern Oscillation). Lake surface temperature dynamics in nearly all lakes were found to be sensitive to the latitudinal position of the Inter Tropical Convergence Zone. Phytoplankton dynamics varied considerably between lakes, with increasing and decreasing trends. Intra-lake differences in both surface temperature and phytoplankton dynamics occurred for many of the larger lakes. This inter-comparison of bio-optical and thermal dynamics provides new insights into the response of these ecosystems to global and regional drivers.
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    Future success and ways forward for scientific approaches on the African Great Lakes
    (Journal of Great Lakes Research, 2023) Lawrence, Ted J.; Achieng, Alfred O.; Chavula, Geoffrey; Haambiya, Lloyd Haninga; Iteba, Jacob; Kayanda, Robert; Kaunda, Emmanuel; Migenim Z. Ajode; Muvundja, Fabrice A.; Nakiyende, Herbert; Nyamweya, Chrisphine; Obiero, Kevin; Pierre, Denis Plisnier; Harris, Phiri; Claver, Sibomana; Stephanie, Smith
    The seven African Great Lakes are some of the most critical freshwater, large-lake systems in the world, providing essential services, food, drinking water, and other livelihood support to over 62 million people. Like most freshwater systems around the world, these lakes are strained by anthropogenic stressors, leading to degradation of these biologically important, and human-dependent resources. Despite their importance, these lakes suffer from insufficient research approaches which are short-term, disparate, and unharmonized. Further, a lack of monitoring, data and information exchange, education and training, and gender balance in research, all lead to insufficient knowledge on which to better manage and protect these lakes. While past efforts have resulted in some knowledge accumulation, there is a need for new approaches to understanding and managing these lakes: bottom-up, harmonized, and long-term processes. This paper, and those within this special section of the Journal of Great Lakes Research, highlight new, highly collaborative efforts of freshwater experts representing each riparian country of each African Great Lake through formal advisory groups. These papers are the result of harmonized efforts and collegial agreements as to what issues need to be addressed foremost, written by those on the ground. While each lake has specific, prioritized lists of issues, five overarching issues must be addressed to achieve success on these lakes: providing agency and coordination of African freshwater scientists; increase long-term monitoring; strengthen education and training of existing and future experts; enhance information and data exchange; and ensure stronger gender balance in science and leadership positions.