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Pratt, Donald [1], Foster, Cody [2].

Evidence for a Northern and a Southern Texas Gulf Coast Beach Flora.

The Texas Gulf Coast runs from the coast of Louisiana 350 miles southwest to the tropical coast of Mexico. Regional vegetation patterns were analyzed using ANOSIM (Analysis of Similarity), NMDS (Non-metric Multidimensional Scaling), and ISA (Indicator Species Analysis) based on data gathered from a series of five 1 m2 quadrats placed along a transect of a beach starting at the vegetation line and ending in the backdune on 20 beaches of the Gulf Coast of Texas. ANOSIM and NMDS results indicate that Texas beaches can be divided into northern and southern regions based on differences in species composition of plant communities. Indicator Species Analysis (ISA) identifies indicator species based on a community data matrix of species abundances of user-defined regions based on the criteria of specificity (a species that is unique to a region) and fidelity (the species is found in most samples from a region). The ISA analysis found species characteristic of both the northern (Ambrosia psilostachyia DC., Panicum amarum Elliott, Rayjacksonia phyllocephala (DC.) R.L. Hartm. & M.A. Lane, and Strophostyles helvola (L.) Elliott) and southern beaches (Ipomoea pes-caprae (L.) R. Br.) providing evidence that Texas beaches serve as a transition zone between tropical Mexican and northern temperate US beaches.

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1 - Box 13003 SFA Station, Nacogdoches, TX, 75962, United States
2 - Stephen F. Austin State University, PO Box 13003, Nacogdoches, TX, 75962, United States

plant community ecology.

Presentation Type: Oral Paper
Session: ECO9, Ecology: Species Ranges and Distributions
Location: /
Date: Friday, July 23rd, 2021
Time: 4:00 PM(EDT)
Number: ECO9005
Abstract ID:439
Candidate for Awards:None

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