Diversification in species complexes: Tests of species origin and delimitation in the Bursera simaruba clade of tropical trees (Burseraceae)

Rosell, Julieta A.; Olson, Mark E.; Weeks, Andrea; De‐Nova, José Arturo; Lemos, Rosalinda Medina; Camacho, Jacqueline Pérez; Feria, Teresa Patricia; Gómez-Bermejo, Roberto; Montero, Juan Carlos; Eguiarte, Luis E.

doi:10.1016/j.ympev.2010.08.004

Cited by 36 publications

(20 citation statements)

References 62 publications

(69 reference statements)

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“…, 2003), and, on a finer scale, Laelia rubescens (Orchidaceae, Trapnell & Hamrick, 2004) and Guaicum sanctum (Zygophyllaceae, Fuchs & Hamrick, 2010). In addition, a recent study on diversification in the ‘ simaruba ’ clade of the genus Bursera found that north‐western Costa Rican samples of Bursera simaruba formed a separate clade from Caribbean, Guatemalan and Mexican samples (Rosell et al. , 2010), corroborating our findings.…”

Section: Discussionsupporting

confidence: 91%

Comparative phylogeography of three common Neotropical tree species

Poelchau

Hamrick

2011

Journal of Biogeography

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Aim To determine spatial and temporal commonalities in patterns of chloroplast DNA (cpDNA) variation in three widespread Neotropical tree species. We examine whether patterns of genetic variation are more consistent with Pliocene or Pleistocene divergence. Location Central American forests, located in El Salvador, Nicaragua, Costa Rica and Panama. Methods We collected sequences from two cpDNA loci from c. 30 locations for each of three species –Bursera simaruba (Burseraceae; n = 278), Brosimum alicastrum (Moraceae; n = 210) and Ficus insipida (Moraceae; n = 222) – and additionally sequenced one nuclear locus for Bursera simaruba (n = 45). We used Monmonier’s algorithm to detect genetic barriers between regions. Divergence times between these regions were estimated using coalescent analyses. Results Spatial genetic boundaries were found in similar areas for these species, namely between Costa Rica and Nicaragua for all three species, and between El Salvador and Nicaragua for two species. These boundaries visually coincide with the spatial delimitations of Pliocene islands and previously hypothesized Pleistocene refugia. Divergence time estimates between regions are more consistent with Pleistocene divergence in two of the three species. Main conclusions Our results point to strong commonalities in the spatial locations of genetic boundaries in these three species, despite the complex geological and climatological history of this region, and ecological differences between the species. While spatial genetic boundaries coincide conspicuously with possible Pliocene and Pleistocene barriers to gene flow, we cannot distinguish between the two scenarios because of the strong spatial overlap of both barriers. However, the temporal data tentatively suggest that some of this divergence occurred in the Pleistocene, although limitations in the analysis cannot confirm Pleistocene divergence without external, corroborating data. While we cannot definitively implicate a single historical process as driving patterns of genetic differentiation in all three species, our results represent an initial step towards identifying a common history of Central American tree species.

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Section: Discussionsupporting

confidence: 91%

Comparative phylogeography of three common Neotropical tree species

Poelchau

Hamrick

2011

Journal of Biogeography

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“…However, it is a mistake to characterize the entire field as adopting the GLC or to assume that the GLC is a prerequisite for species delimitation (e.g. Rosell et al 2010;Barrett & Freudenstein 2011;Duminil et al 2012). However, it is good practice to define some species concept when reporting investigation that includes a substantial species delimitation component, if only because this articulation enforces the need for a clear argument regarding the criteria used to recognize species.…”

Section: Box 3 Species Concepts and Species Delimitationmentioning

confidence: 99%

How to fail at species delimitation

et al. 2013

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Species delimitation is the act of identifying species-level biological diversity. In recent years, the field has witnessed a dramatic increase in the number of methods available for delimiting species. However, most recent investigations only utilize a handful (i.e. 2-3) of the available methods, often for unstated reasons. Because the parameter space that is potentially relevant to species delimitation far exceeds the parameterization of any existing method, a given method necessarily makes a number of simplifying assumptions, any one of which could be violated in a particular system. We suggest that researchers should apply a wide range of species delimitation analyses to their data and place their trust in delimitations that are congruent across methods. Incongruence across the results from different methods is evidence of either a difference in the power to detect cryptic lineages across one or more of the approaches used to delimit species and could indicate that assumptions of one or more of the methods have been violated. In either case, the inferences drawn from species delimitation studies should be conservative, for in most contexts it is better to fail to delimit species than it is to falsely delimit entities that do not represent actual evolutionary lineages.

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“…It has been stated that in general, section Bursera (Simaruba, Microphylla, Fagaroides and Fragilis groups) has dentate leaflets. However, within this section the Simaruba group seems to be the only one with entire margins Venable, 1999, p. 1053), though more recently the Caribbean species have been reported to have entire margin too (Rosell et al, 2010). The Fragilis group has been characterized based on its serrate or crenate leaflet margins, while only some taxa of the Fagaroides and Microphylla groups present entire margin Venable, 1999, p. 1053).…”

Section: Discussionmentioning

confidence: 93%

Eocene Bursera (Burseraceaea) in La Carroza Formation, Mexico: a dry tropical flora member

Calvillo-Canadell

Rodríguez-Reyes

Medina-Lemos

et al. 2013

BSGM

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History of plant diversity in Mexico might be sought in detailed descriptions and comparisons of fossil taxa. Fossil plants allow the recognition of plant communities and their history, especially if they include key elements. In Mexico, Bursera is correlated with dry tropical habitats, and its presence in the fossil record certainly helps to trace the history of both the taxon and the habitat. Eocene material from the La Carroza Formation, La Popa basin, in Nuevo León, Mexico contains a diverse leaf assemblage among which certain leaves resemble two morphotypes, both members of Bursera. A brief description of the leaf architecture of Burseraceae is presented in order to unify criteria and establish comparative parameters that allow identification of fossil leaflet compressions and impressions. Burseraceae has variable leaf architecture, and a single character can change in a single leaf and/or leaflet. For example, the characteristic brochidodromous condition of the family may change to craspedodromous, semi-craspedodromous or even eucamptodromous, in a single leaf. Both Eocene species that are recognized here suggest that the sections Bursera and Bullockia, were differentiated around Middle Eocene; however, previous studies suggest an earlier differentiation of these sections. The two new fossil species in La Popa basin support the presence of members of the extant dry tropical forest in northwestern Mexico, but not necessarily the presence of a dry community. This community developed at a time of geologic/physiographic changes in the area, promoting drought and the establishment of a dry flora.Keywords: Burseraceae leaves; Eocene; La Carroza Formation; leaf architecture; Nuevo León, Mexico. Resumen La historia de la diversidad vegetal en México podría ser buscada en descripciones detalladas y comparaciones de los taxa fósiles. Las plantas fósiles permiten el reconocimiento de las comunidades vegetales y su historia

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Diversification in species complexes: Tests of species origin and delimitation in the Bursera simaruba clade of tropical trees (Burseraceae)

Cited by 36 publications

References 62 publications

Comparative phylogeography of three common Neotropical tree species

Comparative phylogeography of three common Neotropical tree species

How to fail at species delimitation

Eocene Bursera (Burseraceaea) in La Carroza Formation, Mexico: a dry tropical flora member

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