Plant Diversity and Endemism of the White-Sand Open Vegetation in the Lowlands of the Amazonas State, Venezuela

Grande A., J. R.; Huber, O.; Riina, R.

doi:10.1007/978-3-031-20799-0_11

Cited by 1 publication

(1 citation statement)

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“…The latter could be evidence of habitat specialization and, as a consequence, incipient genetic isolation that would explain a certain structure of the population (Soltis and Soltis, 1990;Pelosi and Sessa, 2021). In northern South America, numerous endemisms have been described growing in white-sand soils (Fine et al, 2010;Fine and Baraloto, 2016;Grande et al, 2023), which can be associated with different plant formations such as grassland, shrubland, savannas, and sometimes forest (Huang and Hartemink, 2020). Likewise, in this region, the type of soil has proved an important factor in the genetic differentiation of tree populations such as Burseraceae, where they act as distinct genetic pools, with few shared haplotypes (Fine et al, 2013).…”

Section: Morphotypes In a Molecular Contextmentioning

confidence: 99%

Striking genetic homogeneity in the widespread South American bracken

Yañez,

Kinosian,

Ponce

et al. 2024

American J of Botany

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PremiseBracken (Pteridium, Dennstaedtiaceae) is a cosmopolitan genus of aggressive disturbance colonizers that are toxic to agricultural livestock. The taxonomy of Pteridium has been treated in multiple schemes, ranging from one to six species worldwide, with numerous subspecies and varieties. Recent work has focused on the worldwide distribution and systematics of the bracken fern, but South America has been poorly represented. We present the first continent‐wide sampling and analysis of Pteridium esculentum, a Southern Hemisphere diploid species.MethodsWithin South America, P. esculentum has several morphotypes, distinguished into subspecies by variation in indument and lamina architecture. We used double digest restriction site‐associated DNA sequencing (ddRADSeq) to assess the phylogenetic relationships of P. esculentum subspecies.ResultsWe found a striking genetic homogeneity in the species, being able to support only two morphotypes from molecular data: P. e. arachnoideum and P. e. campestre. We had high confidence for shallow and deep phylogenetic relationships, but less support for relationships among crown groups.ConclusionsWe describe an east‐west geographic pattern that would explain the relationships between populations; and, in contrast to previous studies, we detected differences with P. esculentum from Australia. These results will lay the foundations for studying variations in this species' behavior as a weed, as well as its impact on the production of agricultural livestock in South America.

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