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2. Need for harmonized long-term multi-lake monitoring of African Great Lakes

Author

Plisnier, Pierre-Denis, Kayanda, Robert, MacIntyre, Sally, Obiero, Kevin, Okello, William, Vodacek, Anthony, Cocquyt, Christine, Abegaz, Hussein, Achieng, Alfred, Akonkwa, Balagizi, Albrecht, Christian, Balagizi, Charles, Barasa, James, Bashonga, Rafiki Abel, Bishobibiri, Alexis Bashonga, Bootsma, Harvey, Borges, Alberto V, Chavula, Geoffrey, Dadi, Tallent, De Keyzer, Els LR, Doran, Patrick J, Gabagambi, Nestory, Gatare, Robert, Gemmell, Andrew, Getahun, Abebe, Haambiya, Lloyd H, Higgins, Scott N, Hyangya, Beni L, Irvine, Ken, Isumbisho, Mwapu, Jonasse, Carlos, Katongo, Cyprian, Katsev, Sergei, Keyombe, James, Kimirei, Ismael, Kisekelwa, Tchalondawa, Kishe, Mary, Koding, Simon Otoung A, Kolding, Jeppe, Kraemer, Benjamin M, Limbu, Peter, Lomodei, Evans, Mahongo, Shigalla B, Malala, John, Mbabazi, Stella, Masilya, Pascal M, McCandlessz, Matt, Medard, Modesta, Ajode, Zephaniah Migeni, Mrosso, Hillary D, Mudakikwa, Eric R, Mulimbwa, N'sibula, Mushagalusa, Deo, Muvundja, Fabrice A, Nankabirwa, Angela, Nahimana, David, Ngatunga, Benjamin P, Ngochera, Maxon, Nicholson, Sharon, Nshombo, Muderhwa, Ntakimazi, Gaspard, Nyamweya, Chrispine, Nyeko, Joyceikwaput, Olago, Daniel, Olbamo, Tekle, O'Reilly, Catherine M, Pasche, Natacha, Phiri, Harris, Raasakka, Nina, Salyani, Anham, Sibomana, Claver, Silsbe, Greg M, Smith, Stephanie, Sterner, Robert W, Thiery, Wim, Tuyisenge, Janviere, Van der Knaap, Martin, Van Steenberge, Maarten, van Zwieten, Paul AM, Verheyen, Erik, Wakjira, Mulugeta, Walakira, John, Wembo, Oscar Ndeo, and Lawrence, Theodore

Subjects
Fisheries, Limnology, Pollution, Biodiversity, Climate change, Erosion, Physical Geography and Environmental Geoscience, Environmental Science and Management, Environmental Engineering, Ecology, Environmental management
Published
2023

6. Nuclear environmental DNA resolves fine-scale population genetic structure in an aquatic habitat

Author

Liu, Zifang, primary, Kishe, Mary A., additional, Gambagambi, Peter N., additional, Shechonge, Asilatu H., additional, Ngatunga, Benjamin P., additional, Smith, Katie, additional, Saxon, Andrew D., additional, Hudson, Alan G., additional, Linderoth, Tyler, additional, Turner, George F., additional, Collins, Rupert A., additional, and Genner, Martin J., additional

Published
2023
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8. Genetic analysis of Octopus cyanea reveals high gene flow in the South‐West Indian Ocean.

Author

Treleven, Charles R., Kishe, Mary A., Silas, Mathew O., Ngatunga, Benjamin P., Kuboja, Bigeyo N., Mgeleka, Said S., Taylor, Amy L., Elsmore, Megan A. M., Healey, Amy J. E., Sauer, Warwick H. H., Shaw, Paul W., and McKeown, Niall J.

Subjects
*GENETIC drift, *DNA analysis, *GENETIC variation, *OCTOPUSES, *FISHERIES, *GENE flow, *ROTATIONAL grazing
Abstract

Octopus cyanea (Gray, 1849), abundant in the South‐West Indian Ocean (SWIO), constitutes a vital resource for both subsistence and commercial fisheries. However, despite this socioeconomic importance, and recent indications of overfishing, little is known about the population structure of O. cyanea in the region. To inform sustainable management strategies, this study assessed the spatio‐temporal population structure and genetic variability of O. cyanea at 20 sites in the SWIO (Kenya, Tanzania, Mozambique, Madagascar, Mauritius, Rodrigues, and the Seychelle Islands) by complementary analysis of mitochondrial DNA (mtDNA) noncoding region (NCR) sequences and microsatellite markers. MtDNA analysis revealed a shallow phylogeny across the region, with demographic tests suggesting historic population fluctuations that could be linked to glacial cycles. Contrary to expectations, NCR variation was comparable to other mtDNA regions, indicating that the NCR is not a hypervariable region. Both nuclear and mtDNA marker types revealed a lack of genetic structure compatible with high gene flow throughout the region. As adults are sedentary, this gene flow likely reflects connectivity by paralarval dispersal. All samples reported heterozygote deficits, which, given the overall absence of structure, likely reflect ephemeral larval recruitment variability. Levels of mtDNA and nuclear variability were similar at all locations and congruent with those previously reported for harvested Octopodidae, implying resilience to genetic erosion by drift, providing current stock sizes are maintained. However, as O. cyanea stocks in the SWIO represent a single, highly connected population, fisheries may benefit from additional management measures, such as rotational closures aligned with paralarval ecology and spanning geopolitical boundaries. [ABSTRACT FROM AUTHOR]

Published
2024
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10. A chronologically reliable record of 17,000 years of biomass burning in the Lake Victoria area

Author

Temoltzin-Loranca, Yunuen, Gobet, Erika, Vannière, Boris, van Leeuwen, Jacqueline F. N., Wienhues, Giulia Luise, Szidat, Sönke, Courtney-Mustaphi, Colin, Kishe, Mary, Muschick, Moritz, Seehausen, Ole, Grosjean, Martin, and Tinner, Willy

Subjects
Archeology, Global and Planetary Change, 550 Earth sciences & geology, 540 Chemistry, 570 Life sciences, biology, Geology, 910 Geography & travel, 580 Plants (Botany), Ecology, Evolution, Behavior and Systematics
Abstract

Fire regimes differ across tropical and subtropical biomes depending on multiple parameters whose interactions and levels of importance are poorly understood, particularly at multidecadal and longer time scales. In the catchment of Lake Victoria, savanna, rainforest, and Afromontane vegetation have interspersed over the last 17,000 years, which may have influenced the fire regime and vice versa. However, climate and humans are most often the primary drivers of fire regime changes, and analysing their respective roles is critical for understanding current and future fire regimes. Besides a handful of radiocarbon dates on grassy charcoal, the timescales of published studies of Lake Victoria sediment chronologies rely mostly on dates of bulk sediment, and chronological disagreements persist, mainly due to variation between estimations of the 14 C reservoir effect. Here, we provide independent 14 C chronologies for three Late Glacial and Holocene lacustrine sediment cores from various water depths and compare them with the biostratigraphy to establish a new chronological framework. We present the first continuous sedimentary charcoal records from Lake Victoria; these suggest that fire activity varied substantially during the past 17,000 years. Our new pollen records reveal the long-term vegetation dynamics. The available evidence suggests that before human impact increased during the Iron Age (ca. 2400 yr BP), biomass burning was linked to climate and vegetation reorganizations, such as warming, drying, and the expansion of rainforests and savannas. Our results imply that climate can trigger substantial fire regime changes and that vegetation responses to climate change can co-determine the fire regime. For instance, biomass burning decreased significantly when the rainforest expanded in response to increasing temperatures and moisture availability. Such insights into the long-term linkages between climate, vegetation, and the fire regime may help to refine ecosystem management and conservation strategies in a changing global climate.

Published
2023

11. Growth, mortality, exploitation rate and recruitment pattern of Octopus cyanea (Mollusca: Cephalopoda) in the WIO region: A case study from the Mafia Archipelago, Tanzania

Author

Silas, Mathew O., primary, Kishe, Mary A., additional, Mshana, Johnson G., additional, Semba, Masumbuko L., additional, Mgeleka, Said S., additional, Kuboja, Bigeyo N., additional, Ngatunga, Benjamin P., additional, Chande, Muhaji A., additional, and Matiku, Patroba, additional

Published
2021
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