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Anne Blach-Overgaard

Exploring the floristic diversity of tropical Africa

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  • Marc S. M. Sosef
  • ,
  • Gilles Dauby
  • ,
  • Anne Blach-Overgaard
  • Xander van der Burgt
  • ,
  • Luis Catarino
  • ,
  • Theo Damen
  • ,
  • Vincent Deblauwe
  • ,
  • Steven Dessein
  • ,
  • John Dransfield
  • ,
  • Vincent Droissart
  • ,
  • Maria Cristina Duarte
  • ,
  • Henry Engledow
  • ,
  • Geoffrey Fadeur
  • ,
  • Rui Figueira
  • ,
  • Roy E. Gereau
  • ,
  • Olivier J. Hardy
  • ,
  • David J. Harris
  • ,
  • Janneke de Heij
  • ,
  • Steven Janssens
  • ,
  • Yannick Klomberg
  • ,
  • Alexandra C. Ley
  • ,
  • Barbara A. Mackinder
  • ,
  • Pierre Meerts
  • ,
  • Jeike L. van de Poel
  • ,
  • Bonaventure Sonke
  • ,
  • Tariq Stevart
  • ,
  • Piet Stoffelen
  • ,
  • Jens-Christian Svenning
  • Pierre Sepulchre
  • ,
  • Rainer Zaiss
  • ,
  • Jan J. Wieringa
  • ,
  • Thomas L. P. Couvreur

Background: Understanding the patterns of biodiversity distribution and what influences them is a fundamental pre-requisite for effective conservation and sustainable utilisation of biodiversity. Such knowledge is increasingly urgent as biodiversity responds to the ongoing effects of global climate change. Nowhere is this more acute than in species-rich tropical Africa, where so little is known about plant diversity and its distribution. In this paper, we use RAINBIO - one of the largest mega-databases of tropical African vascular plant species distributions ever compiled - to address questions about plant and growth form diversity across tropical Africa.

Results: The filtered RAINBIO dataset contains 609,776 georeferenced records representing 22,577 species. Growth form data are recorded for 97% of all species. Records are well distributed, but heterogeneous across the continent. Overall, tropical Africa remains poorly sampled. When using sampling units (SU) of 0.5 degrees, just 21 reach appropriate collection density and sampling completeness, and the average number of records per species per SU is only 1.84. Species richness (observed and estimated) and endemism figures per country are provided. Benin, Cameroon, Gabon, Ivory Coast and Liberia appear as the botanically best-explored countries, but none are optimally explored. Forests in the region contain 15,387 vascular plant species, of which 3013 are trees, representing 5-7% of the estimated world's tropical tree flora. The central African forests have the highest endemism rate across Africa, with approximately 30% of species being endemic.

Conclusions: The botanical exploration of tropical Africa is far from complete, underlining the need for intensified inventories and digitization. We propose priority target areas for future sampling efforts, mainly focused on Tanzania, Atlantic Central Africa and West Africa. The observed number of tree species for African forests is smaller than those estimated from global tree data, suggesting that a significant number of species are yet to be discovered. Our data provide a solid basis for a more sustainable management and improved conservation of tropical Africa's unique flora, and is important for achieving Objective 1 of the Global Strategy for Plant Conservation 2011-2020. In turn, RAINBIO provides a solid basis for a more sustainable management and improved conservation of tropical Africa's unique flora.

Original languageEnglish
Article number15
JournalB M C Biology
Volume15
Number of pages23
ISSN1741-7007
DOIs
Publication statusPublished - 7 Mar 2017

    Research areas

  • Herbarium specimens, Digitization, Tropical forests, Botanical exploration, Plant growth form, Species richness, Floristic patterns, SUB-SAHARAN AFRICA, TOME-AND-PRINCIPE, SPECIES RICHNESS, FLOWERING PLANTS, EFFECTIVE NUMBER, CITIZEN SCIENCE, VASCULAR PLANTS, BETA DIVERSITY, RAIN-FORESTS, R PACKAGE

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