Révision taxonomique du genre Santiria (Burseraceae) en Afrique tropicale

Ikabanga, Davy U.; Koffi, K. Guillaume; Onana, J. M.; M’Batchi, Bertrand; Hardy, Olivier J.; Stévart, Tariq

doi:10.15553/c2019v742a1

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…It should also be noted that it is more difficult for botanists to access the flowers and fruits of trees that reach the upper stratum and these taxa are therefore less often collected, which explains why the species-level taxonomy of some groups remains uncertain (e.g., Ewédjè et al, 2020). The advent of phylogenetic methods has led to the breakup of some tree species that were previously regarded as having wide distributions but are now recognized as several distinct species, including some that are endemic to our study area (Lissambou et al, 2018;Ikabanga et al, 2019), although this taxonomic bias is not exclusive to tree species (Supplementary Material 2).…”

Section: Overrepresentation Of Endemics Among Shrubs and Underreprese...mentioning

confidence: 99%

Characteristics and Determinants of Endemic Plant Taxa in the Gabonese Area of Endemism

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Lachenaud

Boupoya³

et al. 2022

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Endemism is one of the most important concepts in biogeography and is often used to guide biodiversity conservation, yet our understanding of the determinants of endemism in many biodiverse tropical regions is limited. This is true for western Central Africa, a region with one of the highest levels of plant diversity in tropical Africa, where endemism is poorly documented. This study examines the Gabonese Area of Endemism (GAE) and explores the main characteristics and determinants of its vascular plant endemism with regard to taxonomy, growth form, habitat, distribution, and range size. We compiled a comprehensive, verified specimen database of vascular plant taxa restricted to the GAE, comprising 19,876 occurrences of 1145 species and infraspecific taxa, and we characterized the habitat and habit for each taxon. We then calculated the proportion of taxa in the regional flora that are endemic to the GAE. A Wilcoxon rank-sum test was used to investigate range size among endemic taxa exhibiting different growth forms, and Fisher exact tests were used to explore the association between their habit and habitat, and to test the distribution of these attributes among higher-level taxa and growth forms compared to patterns in the regional flora as a whole. We found that endemic taxa represent ca. 13% of the GAE flora, and that the rate of endemism varies considerably among taxonomic groups and growth forms. Endemism is highest among shrubs (22%) and lowest in herbs (8%), especially monocotyledons (e.g., 5% among Poales). Most endemic taxa grow preferentially in forest habitats, the dominant vegetation type of the region. Endemic trees, which structure forest ecosystems, have significantly larger ranges than endemic herbs, climbers, and shrubs. About 17% of the flora of Gabon is endemic or subendemic to the country. Our results show that the dispersal capacity of taxa and the biogeographical history of the region appear to be critical factors in explaining differences in the rate of endemism among growth forms and taxonomic groups. Our findings also highlight the benefits of carefully building a comprehensive and verified database for studying rare and range-restricted plants, and they underscore the necessity to strengthen botanical exploration throughout western Central Africa in order to develop improved and better-informed conservation strategies.

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Section: Overrepresentation Of Endemics Among Shrubs and Underreprese...mentioning

confidence: 99%

Characteristics and Determinants of Endemic Plant Taxa in the Gabonese Area of Endemism

Texier

Lachenaud

Boupoya³

et al. 2022

annals

Self Cite

View full text Add to dashboard Cite

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Diversity of the Vascular Plants of the Gulf of Guinea Oceanic Islands

Stévart

Dauby

Ikabanga

et al. 2022

Biodiversity of the Gulf of Guinea Oceanic Islands

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Despite a long history of botanical collecting in the three oceanic islands of the Gulf of Guinea, no recent studies have documented floristic patterns. This chapter summarizes information on the vascular plants of the islands, including inventories conducted on Príncipe and São Tomé since 2017, as well as two recent expeditions to Annobón. An updated database of the vascular flora was compiled, which includes 14,376 records representing 1285 species and infraspecific taxa (1028 native). Príncipe has 445 species and infraspecific taxa (394 native), São Tomé has 1044 (842 native), and Annobón has 344 (274 native). Recent inventory work has generated collections of more than 90% of the endemic woody species. Several very rare taxa were rediscovered, including Balthasaria mannii (Oliv.) Verdc., 1969 (Pentaphylacaceae) and Psychotria exellii R. Alves, Figueiredo and A.P. Davis, 2005 (Rubiaceae), neither of which had been seen for more than 50 years. At least 17 species new to science were also discovered on Príncipe and São Tomé. Of the 1028 indigenous taxa, 164 (16%) are currently considered endemic to the islands. Of the 285 species evaluated according to the IUCN Red List criteria, 2 (0.7%) were Data Deficient, 226 (79.3%) Least Concern or Near Threatened, 55 (19.3%) threatened (including 3 Critically Endangered, 21 Endangered, and 31 Vulnerable), and 2 (0.7%) Extinct. On São Tomé and Príncipe, 325 plant species are used in traditional medicine, 37 of which are endemic. These results should be used to identify new priority sites for conservation, including on Annobón, where priority sites are less well defined.

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Révision taxonomique du genre Santiria (Burseraceae) en Afrique tropicale

Cited by 2 publications

References 21 publications

Characteristics and Determinants of Endemic Plant Taxa in the Gabonese Area of Endemism

Characteristics and Determinants of Endemic Plant Taxa in the Gabonese Area of Endemism

Diversity of the Vascular Plants of the Gulf of Guinea Oceanic Islands

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