A new infra-generic classification of the species-rich Neotropical genus Myrcia s.l.

Lucas, Eve; Amorim, Bruno S.; Lima, Duane F.; Lima-Lourenço, A. R.; Lughadha, Eimear Nic; Proença, Carolyn Elinore Barnes; Rosa, Priscila Oliveira; Rosário, Alessandro Silva do; Santos, Leidiana Lima dos; Santos, Matheus Fortes; Souza, Marcelo C.; Staggemeier, Vanessa Graziele; Vasconcelos, Thaís; Sobral, Marcos

doi:10.1007/s12225-017-9730-5

Cited by 44 publications

(43 citation statements)

References 18 publications

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“…Splitting the megagenus into smaller workable units (Lucas et al. ) enabled coordinated research. The first phylogeny for the genus (Lucas et al.…”

Section: Discussionmentioning

confidence: 99%

“…In the interim, informal groups were adopted to guide studies and facilitate discussion. Splitting the megagenus into smaller workable units (Lucas et al 2018) enabled coordinated research. The first phylogeny for the genus (Lucas et al 2011) coincided with increased funding from Brazil, where Myrcia is most diverse (Govaerts et al 2018).…”

Section: Advances In Taxonomy and Ecology Of Neotropical Myrtaceaementioning

confidence: 99%

“…These giants exhibit extreme floral trait homoplasy (Vasconcelos et al 2015), which has made classification difficult for over 2 centuries . Myrcia, here used in the sense of Lucas et al (2018), including species formerly treated as Calyptranthes, Gomidesia, Marlierea, and Mitranthes, is the largest exclusively Neotropical genus in the family (c. 800 species). Myrcia is currently the focus of collaborative monographic effort and a linked initiative to evaluate the extinction risk of all known species by 2021.…”

Section: Introductionmentioning

confidence: 99%

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Harnessing the potential of integrated systematics for conservation of taxonomically complex, megadiverse plant groups

Lughadha

Staggemeier

Vasconcelos

et al. 2019

Conservation Biology

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The value of natural history collections for conservation science research is increasingly recognized, despite their well‐documented limitations in terms of taxonomic, geographic, and temporal coverage. Specimen‐based analyses are particularly important for tropical plant groups for which field observations are scarce and potentially unreliable due to high levels of diversity‐amplifying identification challenges. Specimen databases curated by specialists are rich sources of authoritatively identified, georeferenced occurrence data, and such data are urgently needed for large genera. We compared entries in a monographic database for the large Neotropical genus Myrcia in 2007 and 2017. We classified and quantified differences in specimen records over this decade and determined the potential impact of these changes on conservation assessments. We distinguished misidentifications from changes due to taxonomic remodeling and considered the effects of adding specimens and georeferences. We calculated the potential impact of each change on estimates of extent of occurrence (EOO), the most frequently used metric in extinction‐risk assessments of tropical plants. We examined whether particular specimen changes were associated with species for which changes in EOO over the decade were large enough to change their conservation category. Corrections to specimens previously misidentified or lacking georeferences were overrepresented in such species, whereas changes associated with taxonomic remodeling (lumping and splitting) were underrepresented. Among species present in both years, transitions to less threatened status outnumbered those to more threatened (8% vs 3%, respectively). Species previously deemed data deficient transitioned to threatened status more often than to not threatened (10% vs 7%, respectively). Conservation scientists risk reaching unreliable conclusions if they use specimen databases that are not actively curated to reflect changing knowledge.

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“…Splitting the megagenus into smaller workable units (Lucas et al. ) enabled coordinated research. The first phylogeny for the genus (Lucas et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Advances In Taxonomy and Ecology Of Neotropical Myrtaceaementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Harnessing the potential of integrated systematics for conservation of taxonomically complex, megadiverse plant groups

Lughadha

Staggemeier

Vasconcelos

et al. 2019

Conservation Biology

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“…it is one of the richest pollen sources for pollinators (Wilms et al ., ) and fruit sources for vertebrates (Staggemeier et al ., ) in these biomes); (2) the availability of a series of recent systematic revisions that have significantly increased taxonomic stability (e.g. Lucas et al ., , ; Santos et al ., ); and (3) Myrcia has diversified into one of the most species‐rich areas on the globe, most probably after the establishment of the modern latitudinal gradient of species diversity (Mannion et al ., ; Santos et al ., ).…”

Section: Methodsmentioning

confidence: 99%

“…). Reliable estimates of species numbers are available for these nine clades (Lucas et al ., , ), which is necessary for the evaluation of diversification rates in incomplete phylogenetic datasets (e.g. Rabosky et al ., ).…”

Section: Methodsmentioning

confidence: 99%

Floral uniformity through evolutionary time in a species‐rich tree lineage

et al. 2018

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Changes in floral morphology are expected across evolutionary time and are often promoted as important drivers in angiosperm diversification. Such a statement, however, is in contrast to empirical observations of species-rich lineages that show apparent conservative floral morphologies even under strong selective pressure to change from their environments.Here, we provide quantitative evidence for prolific speciation despite uniform floral morphology in a tropical species-rich tree lineage. We analyse floral disparity in the environmental and phylogenetic context of Myrcia (Myrtaceae), one of the most diverse and abundant tree genera in Neotropical biomes.Variation in floral morphology among Myrcia clades is exceptionally low, even among distantly related species. Discrete floral specialisations do occur, but these are few, present low phylogenetic signal, have no strong correlation with abiotic factors, and do not affect overall macroevolutionary dynamics in the lineage.Results show that floral form and function may be conserved over large evolutionary time scales even in environments full of opportunities for ecological interactions and niche specialisation. Species accumulation in diverse lineages with uniform flowers apparently does not result from shifts in pollination strategies, but from speciation mechanisms that involve other, nonfloral plant traits.

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Neither lysigenous nor just oil: Demystifying myrtaceous secretory cavities

Richit,

Díaz,

Dick

et al. 2023

American J of Botany

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PremiseLeaf subepidermal secretory cavities are a notable trait in Myrtaceae. The formation of these secretory structures is still controversial because of the lack of consensus on their ontogeny among authors. The knowledge about the nature of the compounds present in these cavities has grown over the last few years, demonstrating that terpenoid‐rich oils are not their unique content. These two points are the focus of this study, which investigates the ontogeny, structure and the contents of secretory cavities in Neotropical Myrtaceae.MethodsWe used histochemical tests and Raman analysis to verify the basic chemical composition of cavity content of nine species and investigated the ontogeny of glands in one species, comparing aldehyde‐fixed tissues and fresh sections mounted in an inert medium.ResultsWe observed schizogenous development and appearance in secretory cavities and found that tissue processing may induce cell breakdown, which can be misinterpreted as lysigeny. The content of these cavities contains prospective terpenes, resins, carbonyl groups, and flavonoids.ConclusionsOur findings support the hypothesis that technical artifacts may produce a lysigenous impression in oil glands. These tissue distortions must be considered when interpreting the development of this type of secretory structure. Moreover, the basic analyses of chemical constituents show for the first time that the glands of Neotropical Myrtaceae are potential reservoirs of some compounds previously reported as novelties for a few other myrtaceous species, such as flavonoids. As some of them are non‐lipid compounds, the idea that glands are just oil repositories is no longer applicable.This article is protected by copyright. All rights reserved.

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A new infra-generic classification of the species-rich Neotropical genus Myrcia s.l.

Cited by 44 publications

References 18 publications

Harnessing the potential of integrated systematics for conservation of taxonomically complex, megadiverse plant groups

Harnessing the potential of integrated systematics for conservation of taxonomically complex, megadiverse plant groups

Floral uniformity through evolutionary time in a species‐rich tree lineage

Neither lysigenous nor just oil: Demystifying myrtaceous secretory cavities

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