Browsing by Author "Crowther, Alison"

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    Drivers and trajectories of land cover change in East Africa: human and environmental interactions from 6000 years ago to present
    (Elsevier: Earth-Science Reviews., 2018-03) Marchant, Rob; Richer, Suzi; Boles, Oliver; Capitan, Claudia; Courtney-Mustaphi, Colin J.; Lane, Paul; Prendergast, Mary E.; Stump, Daryl; De Cort, Gijs; Kaplan, Jed O.; Phelps, Leanne; Kay, Andrea; Olago, Dan; Petek, Nik; Platts, Philip J.; Widgren, Mats; Wynne-Jones, Stephanie; Ferro-Vázquez, Cruz; Benard, Jacquiline; Boivin, Nicole; Crowther, Alison; Cuní-Sanchez, Aida; Deere, Nicolas J.; Ekblom, Anneli; Farmer, Jennifer; Finch, Jemma; Fuller, Dorian; Gaillard-Lemdahl, Marie-José; Gillson, Lindsey; Githumbi, Esther; Kabora, Tabitha; Kariuki, Rebecca; Kinyanjui, Rahab; Kyazike, Elizabeth; Lang, Carol; Lejju, Julius; Kathleen, D. Morrison; Muiruri, Veronica; Mumbi, Cassian; Muthoni, Rebecca; Muzuka, Alfred; Ndiema, Emmanuel; Nzabandora, ChantalKabonyi; Onjala, Isaya; PasSchrijver, Annemiek; Rucina, Stephen; Shoemaker, Anna; Thornton-Barnett, Senna; Plas, Geertvan der; Watson, Elizabeth E.; Williamson, David; Wright, David
    East African landscapes today are the result of the cumulative effects of climate and land-use change over millennial timescales. In this review, we compile archaeological and palaeoenvironmental data from East Africa to document land-cover change, and environmental, subsistence and land-use transitions, over the past 6000 years. Throughout East Africa there have been a series of relatively rapid and high-magnitude environmental shifts characterised by changing hydrological budgets during the mid- to late Holocene. For example, pronounced environmental shifts that manifested as a marked change in the rainfall amount or seasonality and subsequent hydrological budget throughout East Africa occurred around 4000, 800 and 300 radiocarbon years before present (yr BP). The past 6000 years have also seen numerous shifts in human interactions with East African ecologies. From the mid-Holocene, land use has both diversified and increased exponentially, this has been associated with the arrival of new subsistence systems, crops, migrants and technologies, all giving rise to a sequence of significant phases of land-cover change. The first large-scale human influences began to occur around 4000 yr BP, associated with the introduction of domesticated livestock and the expansion of pastoral communities. The first widespread and intensive forest clearances were associated with the arrival of iron-using early farming communities around 2500 yr BP, particularly in productive and easily-cleared mid-altitudinal areas. Extensive and pervasive land-cover change has been associated with population growth, immigration and movement of people. The expansion of trading routes between the interior and the coast, starting around 1300 years ago and intensifying in the eighteenth and nineteenth centuries CE, was one such process. These caravan routes possibly acted as conduits for spreading New World crops such as maize (Zea mays), tobacco (Nicotiana spp.) and tomatoes (Solanum lycopersicum), although the processes and timings of their introductions remains poorly documented. The introduction of southeast Asian domesticates, especially banana (Musa spp.), rice (Oryza spp.), taro (Colocasia esculenta), and chicken (Gallus gallus), via transoceanic biological transfers around and across the Indian Ocean, from at least around 1300 yr BP, and potentially significantly earlier, also had profound social and ecological consequences across parts of the region. Through an interdisciplinary synthesis of information and metadatasets, we explore the different drivers and directions of changes in land-cover, and the associated environmental histories and interactions with various cultures, technologies, and subsistence strategies through time and across space in East Africa. This review suggests topics for targeted future research that focus on areas and/or time periods where our understanding of the interactions between people, the environment and land-cover change are most contentious and/or poorly resolved. The review also offers a perspective on how knowledge of regional land-use change can be used to inform and provide perspectives on contemporary issues such as climate and ecosystem change models, conservation strategies, and the achievement of nature-based solutions for development purposes.
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    Remaking the Late Holocene Environment of Western Uganda: Archaeological Perspectives on Kansyore and Later Settlers
    (Springer Link, 2024-07-09) Schmidt, Peter R.; Walz, Jonathan R.; Besigye, Jackline N.; Krigbaum, John; Oteyo, Gilbert; Lejju, Julius B.; Asiimwe, Raymond; Ehret, Christopher; Crowther, Alison; Mwebi, Ogeto; Dunne, Julie; Schmidt, Jane; Okeny, Charles; Niwahereza, Amon; Yeko, Doreen; Bermudez, Katie; Echoru, Isaac
    Archaeological and environmental research by an international and interdisciplinary team opens new perspectives into the settlement histories of Kansyore, Early Iron Age, and Bigo period peoples in the once forested regions of the Ndali Crater Lakes Region (NCLR) of western Uganda. The research examines the role of Kansyore agropastoralists and their Early Iron Age and Bantu-speaking contemporaries in remaking a once forested environment into a forest-savannah mosaic from circa 500 BC to the end of the first millennium AD. Archaeological settlement and subsistence evidence is examined within a framework of social interaction of Sudanic speakers with Bantu speakers, drawing on historical linguistics and environmental studies to arrive at a new synthesis of late Holocene history in western Uganda. This perspective also unveils the significance and chronology of Boudiné ware, a long enigmatic ceramic tradition that we identify as contemporary to Transitional Urewe and deeply influenced through social interactions with those making Kansyore ceramics and inhabiting the same landscape. Using archaeological evidence from fifteen sites and multiple burials spanning from 400 to 1650 calAD, new views of ceramic histories, lifeways, and symbolic values are revealed, including Bigo period settlements that arose in what was an environmental refugium beginning in the early fourteenth century AD. This research also shows that the Kansyore of the forested region east of the Rwenzori Mountains had greater affinities to late Holocene archaeological evidence from western Equatoria, in the southern South Sudan, and Kansyore Island, Uganda, than it does to the Kansyore in eastern Kenya.