Aquatic ecosystem changes in a global biodiversity hotspot: Evidence from the Albertine Rift, central Africa

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dc.contributor.authorMcGlynn, Gayle
dc.contributor.authorLejju, Julius
dc.contributor.authorDalton, Catherine
dc.contributor.authorMooney, Scott D.
dc.contributor.authorRose, Neil L.
dc.contributor.authorTompkins, Adrian M.
dc.contributor.authorBannister, Wayne
dc.contributor.authorTan, Zu D.
dc.contributor.authorZheng, Xianglin
dc.contributor.authorRühland, Katherine M.
dc.contributor.authorTaylor, David
dc.date.accessioned2022-06-06T15:58:47Z
dc.date.available2022-06-06T15:58:47Z
dc.date.issued2019
dc.description.abstractDetermine the extent to which remote, high‐altitude (Afroalpine) aquatic ecosystems in tropical Africa have been impacted by global and regional‐scale environmental change processes. Location: Two volcanic crater lakes (Bisoke and Muhavura) in the Afroalpine zone, Albertine (Western) Rift, central Africa. Methods: Sediment cores were collected from Bisoke and Muhavura lakes and dated using radiometric techniques. A range of sediment‐based proxies was extracted from the cores and quantified. Sedimentary data were subjected to statistical analyses that contributed to the identification of influential environmental variables and their effects on diatom assemblages, the determination of variations in spatial beta diversity and estimates of the rate of compositional turnover over the last c. 1,200 years. Results: Sediments from the two sites provide evidence of the sensitivity of remote, Afroalpine aquatic ecosystems to perturbation. Climate variability has been a major driver of ecological change, particularly at Bisoke Lake, throughout the c. 1,200‐ year‐long record, while Muhavura Lake has been directly impacted by and recovered from at least one volcanic eruption during this time. The effects of climatic warming from the mid‐ to late 19th century and especially from the late 20th century, possibly accentuated by atmospheric deposition‐driven nutrient enrichment, appear increasingly in lockstep. Effects include changes in diatom community composition, increased productivity and compositional turnover, and biotic homogenization (reduced spatial beta diversity) between the two sites. Main conclusions: The two Afroalpine sites record changes in atmospheric conditions and their effects on diatom assemblage composition, particularly over the last c. 150 years. Drivers of these changes have the potential to disrupt ecosystems at lower altitudes in the Albertine Rift, including biodiverse areas of forest, and across tropical Africa more widely.en_US
dc.identifier.citationMcGlynn, G., Lejju, J., Dalton, C., Mooney, S. D., Rose, N. L., Tompkins, A. M., ... & Taylor, D. (2019). Aquatic ecosystem changes in a global biodiversity hotspot: Evidence from the Albertine Rift, central Africa. Journal of Biogeography, 46(9), 2098-2114. DOI: 10.1111/jbi.13643en_US
dc.identifier.other10.1111/jbi.13643
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/3773
dc.language.isoenen_US
dc.publisherJournal of Biogeographyen_US
dc.subjectAfroalpineen_US
dc.subjectAtmospheric depositionen_US
dc.subjectBiotic homogenizationen_US
dc.subjectClimate changeen_US
dc.subjectEutrophicationen_US
dc.subjectPollutionen_US
dc.titleAquatic ecosystem changes in a global biodiversity hotspot: Evidence from the Albertine Rift, central Africaen_US
dc.typeArticleen_US
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