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Journal of Paleolimnology

, Volume 48, Issue 3, pp 485–501 | Cite as

Response of chironomids to late Pleistocene and Holocene environmental change in the eastern Bolivian Andes

  • Joseph J. WilliamsEmail author
  • Stephen J. Brooks
  • William D. Gosling
Original paper

Abstract

We present the first palaeolimnological investigation of chironomid larval assemblages from the Bolivian Eastern Cordillera. Taxonomic diagnoses are provided for the 10 chironomid taxa (subfamilies: Chironominae, Orthocladiinae and Tanypodinae) identified in the lake sediments. We compared changes in the chironomid assemblage from two Andean sites with previously reported palynological, charcoal and geochemical data, and highlight the potential of chironomid analysis to provide additional insights into environmental change in this region of high biodiversity over the last 18,000 years. At Lake Challacaba (17°33.257′S, 65°34.024′W; 3,400 m asl), the chironomid and geochemical data indicate periodic desiccation and hypersalinty of the basin c. 4,000–3,460 cal year BP. Increased abundance of Chironomus sp. at c. 1,000 cal year BP suggests a change in human activity, supporting inferences from the pollen and spore records, which indicate elevated pastoral agriculture at this time. The greatest assemblage change in the chironomid record from Laguna Khomer Kocha Upper (17°16.514′S, 65°43.945′W; 4,153 m asl) occurred at c. 6,380 cal year BP, concomitant with an increase in marsh woodland taxa, wetter conditions and a rising lake level at the end of a Holocene dry event. There is no apparent response in the chironomid assemblage to burning, however, at the onset of this dry event (c. 10,000 cal year BP), which is the major transformative agent of the terrestrial vegetation. This study shows that chironomid assemblages in the tropical Andes responded to regional and local environmental changes, and in particular, that they were sensitive to adjustments in net moisture balance (water level fluctuations and salinity) and anthropogenic impacts (nutrient input). This suggests that within-lake processes are more important as drivers of chironomid assemblage composition than terrestrial vegetation or fire regime. Nevertheless, the full potential of subfossil chironomid analysis will only be realised once more modern autecological data are available.

Keywords

Midges Pre-Columbian humans Holocene dry event Deglaciation Moisture balance Salinity 

Notes

Acknowledgments

This research was funded by a NERC Open CASE studentship with the Natural History Museum, London (NE/F008082/1) and a National Geographic Committee for Research and Exploration grant (8105-06). NERC radiocarbon facility support (1287.0408 and 1463.0410) facilitated the core chronology. In addition we thank Eric Martinez Costas and Lydia Meneses Lizarazu for assistance in the field, Dr. Angela Self for guidance on chironomid identification, and the NHM for funding attendance at the 9th Subfossil Chironomid Workshop, Copenhagen.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Joseph J. Williams
    • 1
    • 3
    Email author
  • Stephen J. Brooks
    • 2
  • William D. Gosling
    • 1
  1. 1.Department of Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)The Open UniversityWalton Hall, Milton KeynesUK
  2. 2.Department of EntomologyNatural History MuseumLondonUK
  3. 3.Department of GeographyKansas State UniversityManhattanUSA

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