A combined analysis of morphological traits, chloroplast and nuclear DNA sequences within Santiria trimera (Burseraceae) suggests several species following the Biological Species Concept

Koffi, Kouamé Guillaum; Heuertz, Myriam; Charles, David; Onana, J. M.; Gavory, Frédérick; Hardy, Olivier J.

doi:10.5091/plecevo.2010.433

Cited by 23 publications

(26 citation statements)

References 23 publications

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“…(), though we considered here only the widespread morphotype with stilt roots and small leaflets (Koffi et al . ); Milicia excelsa by Daïnou et al . (); and Symphonia globulifera by Budde et al .…”

Section: Methodsmentioning

confidence: 97%

Congruent phylogeographical patterns of eight tree species in Atlantic Central Africa provide insights into the past dynamics of forest cover

et al. 2014

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Cycles of Quaternary climatic change are assumed to be major drivers of African rainforest dynamics and evolution. However, most hypotheses on past vegetation dynamics relied on palaeobotanical records, an approach lacking spatial resolution, and on current patterns of species diversity and endemism, an approach confounding history and environmental determinism. In this context, a comparative phylogeographical study of rainforest species represents a complementary approach because Pleistocene climatic fluctuations may have left interpretable signatures in the patterns of genetic diversity within species. Using 1274 plastid DNA sequences from eight tree species (Afrostyrax kamerunensis, A. lepidophyllus, Erythrophleum suaveolens, Greenwayodendron suaveolens, Milicia excelsa, Santiria trimera, Scorodophloeus zenkeri and Symphonia globulifera) sampled in 50 populations of Atlantic Central Africa (ACA), we averaged divergence across species to produce the first map of the region synthesizing genetic distinctiveness and standardized divergence within and among localities. Significant congruence in divergence was detected mostly among five of the eight species and was stronger in the northern ACA. This pattern is compatible with a scenario of past forest fragmentation and recolonization whereby forests from eastern Cameroon and northeastern Gabon would have been more affected by past climatic change than those of western Cameroon (where one or more refugia would have occurred). By contrast, southern ACA (Gabon) displayed low congruence among species that may reflect less drastic past forest fragmentation or a more complex history of vegetation changes. Finally, we also highlight the potential impact of current environmental barriers on spatial genetic structures.

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Section: Methodsmentioning

confidence: 97%

Congruent phylogeographical patterns of eight tree species in Atlantic Central Africa provide insights into the past dynamics of forest cover

et al. 2014

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“…One indirect way of incorporating the geographic context when assessing species boundaries is to analyze whether divergence among genetically isolated lineages occurs independently of their degree of geographic separation (Good and Wake 1992; Sites andMarshall 2003, 2004). Findings revealing that geographically distant populations of the same evolving lineage are genetically more closely related to each other than to geographically proximate populations of other lineages or that highly genetically divergent lineages are found in sympatry would be strong arguments for the recognition of truly distinct species (Minder and Widmer 2008;Koffi et al 2010;Duminil et al 2012).…”

Section: Introductionmentioning

confidence: 97%

Population Genetics Methods Applied to a Species Delimitation Problem: Endemic Trumpet Daffodils (NarcissusSectionPseudonarcissi) from the Southern Iberian Peninsula

Medrano

López-Perea

Herrera

2014

International Journal of Plant Sciences

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“…Given that these botanical features are absent most of the year and/or difficult to access in the canopy, it is often difficult to distinguish sister tree species on the basis of morphological characteristics (Duminil et al. 2006; Koffi et al. 2010).…”

Section: Introductionmentioning

confidence: 99%

CpDNA-based species identification and phylogeography: application to African tropical tree species

Duminil¹,

Heuertz²,

Doucet³

et al. 2010

Molecular Ecology

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Despite the importance of the African tropical rainforests as a hotspot of biodiversity, their history and the processes that have structured their biodiversity are understood poorly. With respect to past demographic processes, new insights can be gained through characterizing the distribution of genetic diversity. However, few studies of this type have been conducted in Central Africa, where the identification of species in the field can be difficult. We examine here the distribution of chloroplast DNA (cpDNA) diversity in Lower Guinea in two tree species that are difficult to distinguish, Erythrophleum ivorense and Erythrophleum suaveolens (Fabaceae). By using a blind-sampling approach and comparing molecular and morphological markers, we first identified retrospectively all sampled individuals and determined the limits of the distribution of each species. We then performed a phylogeographic study using the same genetic data set. The two species displayed essentially parapatric distributions that were correlated well with the rainfall gradient, which indicated different ecological requirements. In addition, a phylogeographic structure was found for E. suaveolens and, for both species, substantially higher levels of diversity and allelic endemism were observed in the south (Gabon) than in the north (Cameroon) of the Lower Guinea region. This finding indicated different histories of population demographics for the two species, which might reflect different responses to Quaternary climate changes. We suggest that a recent period of forest perturbation, which might have been caused by humans, favoured the spread of these two species and that their poor recruitment at present results from natural succession in their forest formations.

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A combined analysis of morphological traits, chloroplast and nuclear DNA sequences within Santiria trimera (Burseraceae) suggests several species following the Biological Species Concept

Cited by 23 publications

References 23 publications

Congruent phylogeographical patterns of eight tree species in Atlantic Central Africa provide insights into the past dynamics of forest cover

Congruent phylogeographical patterns of eight tree species in Atlantic Central Africa provide insights into the past dynamics of forest cover

Population Genetics Methods Applied to a Species Delimitation Problem: Endemic Trumpet Daffodils (NarcissusSectionPseudonarcissi) from the Southern Iberian Peninsula

CpDNA-based species identification and phylogeography: application to African tropical tree species

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