The Predominantly South American Clade of Lobeliaceae

Knox, Eric B.; Muasya, A. Muthama; Muchhala, Nathan

doi:10.1600/036364408784571590

Cited by 36 publications

(59 citation statements)

References 24 publications

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“…Shifts from bird to bat pollination in bromeliads (Fig. 3B) accord with studies on other families (Kay, 2003;Perrett et al, 2007;Knox et al, 2008;Martén-Rodríguez, 2008), and may also reflect the greater efficiency of pollen transfer by bats (Muchhala and Thomson, 2010) as well as the context-specific advantages just discussed.…”

Section: Epiphytism Favors Absorptive Leaf Trichomes and Vice Versasupporting

confidence: 86%

“…The above ideas are confirmed by the association of the Andean and Serra do Mar orogenies -marked by newly formed montane habitats, numerous natural barriers to gene flow, and highly dynamic climates and landscapes during the Plio-Pleistocene (Gentry, 1982;Berry, 1989;Vasconcelos et al, 1992;van der Hammen, 1995;Gregory-Wodzicki, 2000;Grazziotin et al, 2006;Garzione et al, 2008;Antonelli and Sanmartin, 2011) -with several highly diverse plant groups that are widely distributed within each region (e.g., Calceolaria, Centropogon-Burmeistera, Epidendrum, Espeletia, Fuchsia, Lepanthes, and Pleurothallis in the Andes; and Asteraceae [Lychnophora], Bromeliaceae-Bromelioideae, Eriocaulaceae [Leiothrix, Paepalanthus], Gentianaceae, Lentibulariaceae, Myrtaceae, and Velloziaceae in the Serra do Mar) (Gentry, 1982;Peixoto and Gentry, 1990;Luteyn, 2002;Young et al, 2002;Knox et al, 2008;Alves and Kolbek, 2009 [Scherson et al, 2008]). Many of these and other plant and animal clades from the Andes have origins around or after the uplift of the northern cordilleras ca.…”

Section: Geiger Crown Ratesmentioning

confidence: 99%

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Adaptive radiation, correlated and contingent evolution, and net species diversification in Bromeliaceae

Givnish

Barfuss

et al. 2014

Molecular Phylogenetics and Evolution

336

408

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Section: Epiphytism Favors Absorptive Leaf Trichomes and Vice Versasupporting

confidence: 86%

Section: Geiger Crown Ratesmentioning

confidence: 99%

Adaptive radiation, correlated and contingent evolution, and net species diversification in Bromeliaceae

Givnish

Barfuss

et al. 2014

Molecular Phylogenetics and Evolution

336

408

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“…of 2004, crosses were made between two populations of Burmeistera sodiroana, one from Bellavista Reserve (BV) on the western slopes of the Andes of Ecuador and one from Yanayacu Reserve (YC) on the eastern slopes. These populations differ in the length of the staminal column, but are otherwise morphologically identical (Muchhala 2006a), and conspecific according to a phylogenetic analysis (Knox et al 2008). This experiment was planned to verify that the populations could be crossed, in order to then be able to estimate the amount of pre-zygotic reproductive isolation that the difference in column length would provide should the populations come into secondary contact (cf.…”

Section: Hybridization and Isolating Mechanismsmentioning

confidence: 99%

Associations between floral specialization and species diversity: cause, effect, or correlation?

2008

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It has been proposed frequently, from Darwin's time onwards, that specialized pollination increases speciation rates and thus the diversity of plant species (i.e. clade species richness). We suggest here that the correlation between clade species richness and floral specialization is real, but that clade species richness is frequently the cause, not the result of floral specialization. We urge a broader, variance-partitioning perspective for assessing the causes of this correlation by suggesting four models of how the diversityspecialization correlation might come about: (1) floral specialization promotes initial reproductive isolation (''Initial-RI'' model), (2) floral specialization promotes reinforcement of reproductive isolation upon secondary contact (''Reinforcement'' model), (3) floral specialization reduces the extinction rate by promoting tighter species packing (''Extinction'' model), (4) floral specialization is the result of high clade species richness, which increases the number of related species in communities, and thus selects for floral character displacement (''Character-Displacement'' model). These hypotheses are evaluated by comparing the relationships between species richness, speciation mechanisms, and pollination precision, accuracy, and specialization in the broader literature and, more specifically, in four study systems: Dalechampia (Euphorbiaceae), Collinsia (Plantaginaceae), Burmeistera (Campanulaceae), and Stylidium (Stylidiaceae). These systems provide stronger support for the character-displacement hypothesis, wherein local species diversity drives the evolution of specialized pollination. Although the two reproductive-isolation hypotheses may hold for plants like orchids, with extremely precise pollination systems, the reproductive character-displacement hypothesis seems likely to be more important for plant groups with less precise pollination systems.

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“…It is very similar to S. tillettii Steyerm., from which it can be differentiated according to the characters listed in Table 1. Although infrageneric, and even generic divisions within subfamily Lobelioideae do not reflect the current phylogenetic hypothesis (Knox & al., 2008;Lammers, 1998), until now the most thorough classification is that of Wimmer (1953), according to which Siphocampylus acanthidiotrichus and S. tillettii are part of Siphocampylus sect. Macrosiphon subsect.…”

Section: Diagnostic Charactersmentioning

confidence: 89%