Implications for conservation assessment from flux in the botanical record over 20 years in southwest Ghana

• Published in: Ecology and evolution 2023-01, Vol.13 (1), p.e9775-n/a
• Main Authors: Marshall, Cicely A. M., Dabo, Jonathan, Mensah, Markfred, Ekpe, Patrick, Hawthorne, William D.
• Format: Article
• Language: English
• Subjects: Assessments; Biodiversity; Biodiversity hot spots; Conservation; endemism; Flora; Flowers & plants; Forests; Geographical distribution; global plant inventory; Natural history; Nature reserves; New records; New species; Plants (botany); Rare species; species discovery; Taxonomy; tropical biodiversity; Tropical environments; Vegetation
• ISSN: 2045-7758; 2045-7758
• DOI: 10.1002/ece3.9775

At best, conservation decisions can only be made using the data available at the time. For plants and especially in the tropics, natural history collections remain the best available baseline information upon which to base conservation assessments, in spite of well‐documented limitations in their taxonomic, geographic, and temporal coverage. We explore the extent to which changes to the plant biological record over 20 years have changed our conception of the conservation importance of 931 plant taxa, and 114 vegetation samples, recorded in forest reserves of the southwest Ghana biodiversity hotspot. 36% of species‐level assessments changed as a result of new distribution data. 12% of species accepted in 2016 had no assessment in 1996: of those, 20% are new species publications, 60% are new records for SW Ghana, and 20% are taxonomic resolutions. Apparent species ranges have increased over time as new records are made, but new species publications are overwhelmingly of globally rare species, keeping the balance of perceived rarity in the flora constant over 20 years. Thus, in spite of considerable flux at the species record level, range size rarity scores calculated for 114 vegetation samples of the reserves in 1996 and 2016 are highly correlated with each other: r(112) = 0.84, p