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Seasonal activity patterns of African savanna termites vary across a rainfall gradient

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Abstract

Seasonal variations in temperature and moisture are strong drivers of biological activity and diversity. Termites are an important insect group previously shown to respond to seasonal variation, but results are mixed with unclear patterns across habitat types. We investigated seasonal variation in termite species density, activity levels and assemblage composition across three seasons (wet, transitional and dry) and four savanna types across a rainfall gradient (450–900 mm year−1) in South Africa using cellulose baits. Termites responded to seasonality in all savannas investigated, with lower species density and activity levels during the dry season compared to the wet and transitional seasons. In the more arid sites (≤550 mm rainfall per year) activity levels were highest in the wet season, while at wetter sites (≥750 mm rainfall per year) the highest activity was recorded in the transitional season. Assemblage composition did not differ much between seasons across all sites, but differences in both composition and activity levels across seasons were more pronounced in wetter sites compared to drier ones. Our results demonstrate that seasonal patterns in termite diversity vary with mean annual rainfall, with larger variation in wetter habitats where climatic variation between seasons is greater.

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Acknowledgments

We thank all the volunteers who assisted with sampling as well as South African National Parks, Ezemvelo KZN Wildlife, the University of Pretoria, and the Natural History Museum for logistical support. Funding was provided through an Innovation Award to CLP from The Rufford Foundation.

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Authors and Affiliations

  1. Department of Zoology and Entomology, University of Pretoria, Pretoria, 0002, South Africa

    A. B. Davies

  2. Soil Biodiversity Group, Life Sciences Department, The Natural History Museum, Cromwell Road, London, SW7 5BD, UK

    P. Eggleton

  3. School of Biological Sciences, University of Queensland, St. Lucia, QLD, 4072, Australia

    B. J. van Rensburg

  4. Department of Zoology, DST-NRF Centre for Invasion Biology, University of Johannesburg, Auckland Park, Johannesburg, 2006, South Africa

    B. J. van Rensburg

  5. School of Environmental Sciences, University of Liverpool, Liverpool, L69 3GP, UK

    C. L. Parr

  6. Department of Global Ecology, Carnegie Institution for Science, 260 Panama Street, Stanford, CA, 94305, USA

    A. B. Davies

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  1. A. B. Davies
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Correspondence to A. B. Davies.

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Davies, A.B., Eggleton, P., van Rensburg, B.J. et al. Seasonal activity patterns of African savanna termites vary across a rainfall gradient. Insect. Soc. 62, 157–165 (2015). https://doi.org/10.1007/s00040-014-0386-y

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