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Late-twentieth-century warming in Lake Tanganyika unprecedented since AD 500

Nature Geoscience volume 3, pages 422425 (2010) | Download Citation

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Abstract

Instrumental observations suggest that Lake Tanganyika, the largest rift lake in East Africa, has become warmer, increasingly stratified and less productive over the past 90 years (refs 1,​2). These trends have been attributed to anthropogenic climate change. However, it remains unclear whether the decrease in productivity is linked to the temperature rise3,4, and whether the twentieth-century trends are anomalous within the context of longer-term variability. Here, we use the TEX86 temperature proxy, the weight per cent of biogenic silica and charcoal abundance from Lake Tanganyika sediment cores to reconstruct lake-surface temperature, productivity and regional wildfire frequency, respectively, for the past 1,500 years. We detect a negative correlation between lake-surface temperature and primary productivity, and our estimates of fire frequency, and hence humidity, preclude decreased nutrient input through runoff as a cause for observed periods of low productivity. We suggest that, throughout the past 1,500 years, rising lake-surface temperatures increased the stratification of the lake water column, preventing nutrient recharge from below and limiting primary productivity. Our records indicate that changes in the temperature of Lake Tanganyika in the past few decades exceed previous natural variability. We conclude that these unprecedented temperatures and a corresponding decrease in productivity can be attributed to anthropogenic global warming, with potentially important implications for the Lake Tanganyika fishery.

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References

  1. 1.

    , , , & Climate change decreases aquatic ecosystem productivity of Lake Tanganyika, Africa. Nature 424, 766–768 (2003).

  2. 2.

    , & Ecological consequences of a century of warming in Lake Tanganyika. Science 301, 505–507 (2003).

  3. 3.

    The heat on Lake Tanganyika. Nature 424, 731–732 (2003).

  4. 4.

    et al. Fish catches from Lake Tanganyika mainly reflect changes in fishery practices, not climate. Verh. Int. Ver. Limnol. 29, 1182–1188 (2006).

  5. 5.

    , & Fisheries Characteristics of the Shared Lakes of the East African Rift. CIFA Technical Paper no. 24. (FAO, 1994).

  6. 6.

    , , & Fisheries research towards resource management of Lake Tanganyika. Hydrobiologia 407, 1–24 (1999).

  7. 7.

    , , & Relationship between primary production and fish production in Lake Tanganyika. Trans. Am. Fisheries Soc. 110, 336–345 (1981).

  8. 8.

    , & in Lake Tanganyika and its Life (ed. Coulter, G. W.) 76–89 (Oxford Univ. Press, 1991).

  9. 9.

    & in Lake Tanganyika and its Life (ed. Coulter, G. W.) 49–75 (Oxford Univ. Press, 1991).

  10. 10.

    Paleolimnological investigations of anthropogenic environmental change in Lake Tanganyika: IX. Summary of paleorecords of environmental change and catchment deforestation at Lake Tanganyika and impacts on the Lake Tanganyika ecosystem. J. Paleolimnol. 34, 125–145 (2005).

  11. 11.

    , , , & Global sediment core-top calibration of the TEX86 paleothermometer in the ocean. Geochim. Cosmochim. Acta 72, 1154–1173 (2008).

  12. 12.

    et al. Large temperature variability in the southern African tropics since the Last Glacial Maximum. Geophys. Res. Lett. 32, L08706 (2005).

  13. 13.

    et al. Northern Hemisphere controls of tropical Southeast African climate during the past 60,000 years. Science 322, 252–255 (2008).

  14. 14.

    et al. Applicability and calibration of the TEX86 paleothermometer in lakes. Org. Geochem. 41, 404–413 (2010).

  15. 15.

    , , , & African climate change: 1900–2100. Clim. Res. 17, 145–168 (2001).

  16. 16.

    et al. Scientific Support Plan for a Sustainable Development Policy (SPSD II), Part II: Global Change, Ecosystems and Biodiversity—Atmosphere and Climate (Belgian Science Policy, 2003).

  17. 17.

    & The physics of the warming of Lake Tanganyika by climate change. Limnol. Oceanogr. 54, 2418–2430 (2009).

  18. 18.

    et al. Late Holocene linkages between decade–century scale climate variability and productivity at Lake Tanganyika, Africa. J. Paleolimnol. 36, 189–209 (2006).

  19. 19.

    et al. in Climate Change 2007: The Physical Science Basis (eds Solomon, S. D. et al.) (Cambridge Univ. Press, 2007).

  20. 20.

    Causes of climate change over the past 1000 years. Science 289, 270–277 (2000).

  21. 21.

    , & Total solar irradiance during the Holocene. Geophys. Res. Lett. 36, L19704 (2009).

  22. 22.

    , & A simple method for the rapid determination of biogenic opal in pelagic marine sediments. Deep-Sea Res. A 36, 1415–1426 (1989).

  23. 23.

    , , , & Analytical methodology for TEX86 paleothermometry by high-performance liquid chromatography/atmospheric pressure chemical ionization-mass spectrometry. Anal. Chem. 79, 2940–2944 (2007).

  24. 24.

    A method to estimate the statistical significance of a correlation when the data are serially correlated. J. Clim. 10, 2147–2153 (1997).

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Acknowledgements

We thank Y. Huang and M. Alexandre for laboratory analytical assistance. We also thank the Tanzania Fisheries Research Institute (TAFIRI), the University of Dar es Salaam and the crew of the M/V Maman Benita for assistance in the field. This research was supported by NSF-EAR 0639474 to J.M.R. and the Nyanza Project (NSF-ATM 0223920 to A.S.C.).

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Affiliations

  1. Brown University Department of Geological Sciences, Box #1846, Providence, Rhode Island 02912, USA

    • Jessica E. Tierney
    • , Marc T. Mayes
    • , Natacha Meyer
    •  & James M. Russell
  2. Center for Sustainability and the Global Environment, Nelson Institute for Environmental Studies, University of Wisconsin-Madison, 1710 University Ave., Madison, Wisconsin 53726, USA

    • Marc T. Mayes
  3. Department of Geosciences, University of Arizona, 1040 E 4th St., Tucson, Arizona 85721, USA

    • Christopher Johnson
    •  & Andrew S. Cohen
  4. Department of Ecology and Evolutionary Biology, University of California, Los Angeles, California 90095, USA

    • Christopher Johnson
  5. United States Geological Survey, 400 Natural Bridges Drive, Santa Cruz, California 95060, USA

    • Peter W. Swarzenski

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Contributions

J.E.T. designed the experiment, assisted with the laboratory analyses, analysed the results and wrote the paper. M.T.M. produced the majority of the biogenic silica and TEX86 data and assisted in writing the manuscript. N.M. produced the remaining biogenic silica and TEX86 data. C.J. and A.S.C. produced the charcoal data. P.W.S. was responsible for the 210Pb analyses and multicore age model. J.M.R. and A.S.C. helped design the experiment and supervised the project.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Jessica E. Tierney.

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DOI

https://doi.org/10.1038/ngeo865

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