Abstract Detail



Systematics

Edwards, Caroline [1], LoPresti, Eric [2], Douglas, Norman [3], Flores Olvera, Hilda [4], Ochoterena, Helga [4], Moore, Michael J. [5].

Niche evolution in Abronia and Tripterocalyx (Nyctaginaceae).

Abronia and Tripterocalyx (Nyctaginaceae) are sister genera with centers of diversity in the western US, and are herbaceous perennials or annuals with umbellate inflorescences and distinct winged fruit morphology. While the four species of Tripterocalyx occupy a similar niche, growing on sandy soils in desert scrub habitats, the approximately 20 species of Abronia occupy a diverse range of niches, growing on a wide variety of substrates with endemics to sand, gypsum, and clay, and occurring in nearly every ecosystem in the western US. Species of this clade are distributed throughout the west in coastal strands, high-elevation alpine environments, grasslands, and warm deserts, with several localized endemics on the Colorado Plateau, and taxa endemic to east Texas and to south Texas. To better understand the evolution of these taxa, we have reconstructed the phylogeny of Abronia and Tripterocalyx using two plastid spacer regions (ndhF/rpl32 and rpl32/trnL) and nuclear ITS, with almost every species of the genera and including multiple populations of each species when possible. This phylogeny shows the earliest split contains a clade with primarily California species, A. umbellata and A. maritima, two of the three coastal species, and a clade with the rest of the species of Abronia, which are further resolved into higher elevation/northern taxa and lower elevation/southern taxa. Through character state reconstructions, we have found that the ancestral soil preference for Abronia was for sandy soils and gypsum endemism originated twice.


Related Links:
The Origin and Evolution of Gypsum Endemic Plants


1 - Oberlin College, 119 Woodland St., Oberlin, OH, 44074, USA
2 - Michigan State University, Department of Plant Biology, 612 Wilson Road, East Lansing, MI, 48824, USA
3 - University Of Florida, Biology, PO Box 118525, Gainesville, FL, 32611, United States
4 - Instituto de Biología, UNAM, Apartado Postal 70-367, Mexico, DF, 04510, Mexico
5 - Oberlin College, Department Of Biology, 119 Woodland St., Science Center K111, Oberlin, OH, 44074, United States

Keywords:
Abronia
Tripterocalyx
Nyctaginaceae
edaphic
North America
Phylogenetics.

Presentation Type: Poster
Number: PSY010
Abstract ID:454
Candidate for Awards:None


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