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Latitude, paleo-history and forest size matter for Afromontane canopy beetle diversity in a world context

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Abstract

Tree canopies in forests host exceptional levels of biodiversity. However ecologists are still faced with vast regional gaps in need of fundamental information on the nature of tree canopy diversity. The southern Afrotemperate forests at the tip of Africa are ancient, existing today as a biogeographical string of natural remnants from long-past climate events. Their canopy arthropod fauna is scarcely known, but could provide insights into global canopy diversity patterns. As part of the broader Afromontane archipelago and southern hemispheric forests in general, they form part of the last and largest global gaps in canopy science. Here we ask how the canopy beetle diversity of these forests qualitatively and quantitatively compare with other forests around the world. We show that beetle species richness and richness per m2 are closer to temperate than tropical canopies. Estimates for beetle richness most closely matched the latitudinal equivalent Chilean temperate rainforests. However, feeding guild structure of beetles are closer in resemblance to tropical than temperate forest canopies, in line with expectations regarding the region’s paleo-history. The most diverse beetle families, Curculionidae, Staphylinidae and Chrysomelidae, were proportionately similar to both temperate and tropical forest canopies. We discuss the importance of latitude, paleo-history and forest size when considering canopy fauna in a global context.

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Acknowledgements

SANParks (Garden Route National Park, Scientific Services), Cape Nature (Grootvadersbosch Nature Reserve), Mosselbay Municipality, and landowners at Oubos gave permission to sample, and Dyna Fog Africa supplied equipment. A Cilliers assisted with sampling.

Funding

National Research Foundation (Grant Number SFH150723130214).

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Contributions

RCS: study design, data collection, laboratory work, statistical analyses, writing of first draft; MJS: study concept, acquired funding, writing of manuscript; FR: study concept, acquired funding, writing of manuscript.

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Correspondence to Rudi C. Swart.

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The authors declare no conflict of interest.

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Communicated by Nigel E. Stork.

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Swart, R.C., Samways, M.J. & Roets, F. Latitude, paleo-history and forest size matter for Afromontane canopy beetle diversity in a world context. Biodivers Conserv 30, 659–672 (2021). https://doi.org/10.1007/s10531-020-02108-0

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