Comparative phylogeography of African rain forest trees: A review of genetic signatures of vegetation history in the Guineo-Congolian region

Hardy, Olivier J.; Born, Céline; Budde, Katharina B.; Daïnou, Kasso; Dauby, Gilles; Duminil, Jérôme; Ewedje, Eben-Ezer; Gomez, Céline; Heuertz, Myriam; Koffi, Guillaume K.; Lowe, Andrew J.; Micheneau, Claire; Ndiade-Bourobou, Dyana; Piñeiro, Rosalía; Poncet, Valérie

doi:10.1016/j.crte.2013.05.001

Cited by 94 publications

(151 citation statements)

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“…suaveolens , M. excelsa , S. globulifera and T. acuminata ), in agreement with the expectation of the N-S evolutionary scenario. A similar genetic break zone in the LG region has been suggested based on nuclear markers in a review by Hardy et al [36] which included also the following species: Santiria trimera [45], Distemonanthus benthamianus [44], Irvingia gabonensis [43] and Aucoumea klaineana [42], and moreover, floristic analysis on local assemblages of tree species also suggested the existence of a floristic differentiation between N and S of the climatic hinge [37]. Our suggested barrier zone was located somewhat further south than that suggested by Hardy et al [36].…”

Section: Discussionsupporting

confidence: 72%

“…A similar genetic break zone in the LG region has been suggested based on nuclear markers in a review by Hardy et al [36] which included also the following species: Santiria trimera [45], Distemonanthus benthamianus [44], Irvingia gabonensis [43] and Aucoumea klaineana [42], and moreover, floristic analysis on local assemblages of tree species also suggested the existence of a floristic differentiation between N and S of the climatic hinge [37]. Our suggested barrier zone was located somewhat further south than that suggested by Hardy et al [36]. That paper offers several non-excluding explanations for a divergence pattern matching the climatic hinge, namely 1) a modified glacial refuge hypothesis where Plio-Pleistocene populations of forest organisms persisted through adverse climate stages on both sides of the climatic hinge, 2) impeded gene flow between regions caused by phenological differences, potentially coupled with 3) postzygotic selection affecting ill-adapted immigrants into either regions, which could occur if northern and southern populations were locally adapted to their idiosyncratic climatic conditions [17].…”

Section: Discussionsupporting

confidence: 72%

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Comparative Phylogeography in Rainforest Trees from Lower Guinea, Africa

et al. 2014

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Comparative phylogeography is an effective approach to assess the evolutionary history of biological communities. We used comparative phylogeography in fourteen tree taxa from Lower Guinea (Atlantic Equatorial Africa) to test for congruence with two simple evolutionary scenarios based on physio-climatic features 1) the W-E environmental gradient and 2) the N-S seasonal inversion, which determine climatic and seasonality differences in the region. We sequenced the trnC-ycf6 plastid DNA region using a dual sampling strategy: fourteen taxa with small sample sizes (dataset 1, mean n = 16/taxon), to assess whether a strong general pattern of allele endemism and genetic differentiation emerged; and four taxonomically well-studied species with larger sample sizes (dataset 2, mean n = 109/species) to detect the presence of particular shared phylogeographic patterns. When grouping the samples into two alternative sets of two populations, W and E, vs. N and S, neither dataset exhibited a strong pattern of allelic endemism, suggesting that none of the considered regions consistently harboured older populations. Differentiation in dataset 1 was similarly strong between W and E as between N and S, with 3–5 significant F ST tests out of 14 tests in each scenario. Coalescent simulations indicated that, given the power of the data, this result probably reflects idiosyncratic histories of the taxa, or a weak common differentiation pattern (possibly with population substructure) undetectable across taxa in dataset 1. Dataset 2 identified a common genetic break separating the northern and southern populations of Greenwayodendron suaveolens subsp. suaveolens var. suaveolens, Milicia excelsa, Symphonia globulifera and Trichoscypha acuminata in Lower Guinea, in agreement with differentiation across the N–S seasonal inversion. Our work suggests that currently recognized tree taxa or suspected species complexes can contain strongly differentiated genetic lineages, which could lead to misinterpretation of phylogeographic patterns. Therefore the evolutionary processes of such taxa require further study in African tropical rainforests.

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Section: Discussionsupporting

confidence: 72%

Section: Discussionsupporting

confidence: 72%

Comparative Phylogeography in Rainforest Trees from Lower Guinea, Africa

et al. 2014

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“…However, since this is the only obvious difference between G. brachystegioides specimens from Cameroon and those from Gabon, and since there is considerable overlap, the Gabon specimens may not represent a different taxon. On the other hand some recent molecular studies show a general pattern of a genetic discontinuity that lies in Northern Gabon and seems to separate several Cameroonian populations or species from Gabonese ones (Peccoud et al 2013;Hardy et al 2014). Presently there are eight flowering specimens from Cameroon, but there are only three flowering collections from Gabon (Groulez 1109, Wilks 1086, 1600) and one from Equatorial Guinea (Wilks 3582).…”

Section: Gilbertiodendron Sulfureummentioning

confidence: 87%

The Gilbertiodendron ogoouense species complex (Leguminosae: Caesalpinioideae), Central Africa

et al. 2015

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“…The first hypothesis corresponds to the existence of climate and/or soil gradients. The second hypothesis corresponds to the colonization from a past Congolian refugia during forest fragmentation of the Pleistocene, a phenomenon that has shaped the spatial and genetic structure of tree populations [30]. Selected gaps were 5 to 12 months old.…”

Section: Enrichment Of Logging Gapsmentioning

confidence: 99%

Enrichment of Logging Gaps with a High Conservation Value Species (Pericopsis elata) in a Central African Moist Forest

Ouédraogo

Daïnou

Demaret

et al. 2014

Forests

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Abstract:In central Africa, most of the timber species require high light at the seedling stage for survival and growth. Forest managers face a regeneration shortage of these light-demanding timber species. To achieve long-term sustainability, there is a need for enrichment methods combining low cost and high species performance. The aim of this study was to assess the performance of Pericopsis elata seedlings in enriched logging gaps in Cameroon. Over five years; the survival and size of each seedling was monitored in 27 logging gaps that were either left without maintenance or cleared. Gaps were relatively small with an average total area of 155 m 2 . We found that planted seedlings of P. elata performed well in logging gaps. Even without any maintenance 61% of the planted seedlings survived after five years with an average annual diameter increment of 0.28 cm. P. elata appeared to be a good candidate species for enrichment in logging gaps. We demonstrated OPEN ACCESSForests 2014, 5 3032 that the seedlings of P. elata tolerated a wide range of soil conditions but that their performance was strongly influenced by light availability (gap clearance), suggesting potentially improved performance of P. elata in high light environments such as in plantation or larger gaps.

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Comparative phylogeography of African rain forest trees: A review of genetic signatures of vegetation history in the Guineo-Congolian region

Cited by 94 publications

References 56 publications

Comparative Phylogeography in Rainforest Trees from Lower Guinea, Africa

Comparative Phylogeography in Rainforest Trees from Lower Guinea, Africa

The Gilbertiodendron ogoouense species complex (Leguminosae: Caesalpinioideae), Central Africa

Enrichment of Logging Gaps with a High Conservation Value Species (Pericopsis elata) in a Central African Moist Forest

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