Title: Mapping ignorance: 300 years of collecting flowering plants in Africa
Citation: GLOBAL ECOLOGY AND BIOGEOGRAPHY vol. 25 no. 9 p. 1085-1096
Publication Year: 2016
JRC N°: JRC101457
ISSN: 1466-822X
URI: http://onlinelibrary.wiley.com/doi/10.1111/geb.12468/abstract
DOI: 10.1111/geb.12468
Type: Articles in periodicals and books
Abstract: Aim Spatial and temporal biases in species-occurrence data can compromise broad-scale biogeographical research and conservation planning. Although spatial biases have been frequently scrutinized, temporal biases and the overall quality of species-occurrence data have received far less attention. This study answers three questions: (i) How reliable are species-occurrence data of flowering plants in Africa? (ii) Where and when did botanical sampling occur in the past 300 years? (iii) How complete are plant inventories for Africa? Location Africa. Methods By filtering a publicly available dataset containing 3.5 million records of flowering plants, we obtained 934,676 herbaria specimens with complete information regarding species name, date and location of collection. Based on these specimens, we estimated inventory completeness for sampling units (SUs) of 25 x 25 km. We then tested whether the spatial distribution of well-sampled SUs was correlated with temporal parameters of botanical sampling. Finally, we determined whether inventory completeness in individual countries was related to old or recently collected specimens. Results Thirty-one percent of SUs contained at least one specimen, whereas only 2.4% of SUs contained a sufficient number of specimens to reliably estimate inventory completeness. We found that the location of poorly sampled areas remained almost unchanged for half-century. Moreover, there was pronounced temporal bias towards old specimens in South Africa, the country that holds half of the available data for the continent. There, high inventory completeness stems from specimens collected several decades ago. Main conclusions Despite the increasing availability of species-occurrence data for Africa, broad scale biogeographical research is still compromised by the uncertain quality and spatial and temporal biases of such data. To avoid erroneous inferences, the quality and biases in species-occurrence data should be critically evaluated and quantified prior to use. To this end, we propose a quantification method based on inventory completeness using easily accessible species-occurrence data.
JRC Directorate:Sustainable Resources

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