| Abstract Detail
Biogeography Saghatelyan, Anna [1]. Areas of Endemism in Southcentral/Southwestern USA Based on Selected Angiosperms. The southern boundary of the U.S.A. has a diverse flora on the junction of the Madrean and Boreal subkingdoms. To resolve the controversies in different regionalization systems we perform endemicity analysis of selected seed plant species. The goals of our study are: finding areas of endemism in south-central/southwestern U.SA., comparing them with published chorionomic units, and conducting a phylogenetic literature search for relationships of the endemic species. The database was built with 49, 290 specimen point records for 259 species from the floras of southern Texas, Arizona, and California. We have built ecological niche models of those species and applied endemicity analysis with NDM/VNDM to the raw distributional data. The resulting 18 areas of endemism are split into two groups, Southwestern and Eastern. Many genera found in the flora are geographically split to western and eastern clades. Many species of the southwestern areas of endemism are in the local genera with extensive radiation in the Sonoran and Mohave deserts extending to adjacent areas. Their connections pass along the western backbone of the Americas with some endemic species representing early derived members of their families or genera. There are species with North temperate connections in the South Rocky Mountains and the eastern cluster of areas of endemism. The species of the Eastern group have East Madrean/Mesoamerican and amphiatlantic connections to the Old World. The East to West floristic boundary passes through Texas along the fuzzy boundary of the Chihuahuan and Tamaulipan subprovinces, with the latter in the Eastern Region.
1 - McMurry University, Biology, McMurry Station Box 368, Abilene, TX, 79697, United States
Keywords:
areaas of endemism
southern U.S.A
Biogeography
disjunctions
flora of Texas.
Presentation Type: Poster
Session: P, Biogeography Posters
Location: Virtual/Virtual
Date: Monday, July 27th, 2020
Time: 5:00 PM Time and date to be determined
Number: PBG002
Abstract ID:264
Candidate for Awards:None |
