[Srm] Fwd: [Snre] with date: MASTERS DEFENSE ANNOUNCEMENT

[Mcclaran, Mitchel P - (mcclaran)]

Sent from iPhone, please excuse brevity and errors

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From: "Hughes, Kathleen Marie - (khughes)" <khughes at email.arizona.edu<mailto:khughes at email.arizona.edu>>
Date: November 27, 2012, 9:59:37 AM MST
To: "srnrgrad at list.arizona.edu<mailto:srnrgrad at list.arizona.edu>" <srnrgrad at list.arizona.edu<mailto:srnrgrad at list.arizona.edu>>, "snre at cals.arizona.edu<mailto:snre at cals.arizona.edu>" <snre at cals.arizona.edu<mailto:snre at cals.arizona.edu>>
Subject: [Snre] with date: MASTERS DEFENSE ANNOUNCEMENT

MASTERS DEFENSE ANNOUNCEMENT:

Native and introduced grasses have different responses to livestock, mesquite, and soil texture

Amber Dalke
 December 3
Saguaro Hall, Room 101 at 11am

ABSTRACT: Mesquite (Prosopis spp.) encroachment is believed to reduce grass abundance.  I evaluated this, accounting for exclusion and ecological site, on perennial grass abundance (biomass/density/performance) in southern Arizona.  Abundance measures were: total/plot, total in the inter-space (OPEN), total covered with mesquite (UNDER), and OPEN-UNDER.  Paired grazed and long-term exclosures were measured in three ecological sites (12-16” precipitation zone): Sandy Loam Deep (SLD), Sandy Loam Upland (SLU), and Loamy Upland (LU).  There were few relationships between abundance and mesquite cover using multiple regression. Abundance was related to grazing and ecological site using two-way ANOVA. Ungrazed areas had greater biomass/performance, but differed between native and introduced species.  More natives UNDER without grazing (Introduced: UNDER greater with grazing), suggests natives respond worse to defoliation under mesquite. Natives were greater on SLD than LU (Introduced: LU>SLD) suggesting sands favors natives. For OPEN-UNDER, natives were negative (Introduced>0) indicating that mesquite favors natives. Perennial grass abundance was unrelated to mesquite, but was related to grazing and ecological site.


Best,
Katie

Katie Hughes
Academic Advisor
School of Natural Resources and the Environment
The University of Arizona
Biosciences East, 325
Ph: 520-621-7260<tel:520-621-7260>
khughes at email.arizona.edu<mailto:khughes at email.arizona.edu>

Appointments are available between 10 and 2 most days.  When requesting an appointment, please send me a few days and times that work for you and I will confirm one.




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--
Zulia Mayari Sánchez Mejía
________________________
PhD Candidate
Watershed Management and Ecohydrology
School of Natural Resources
BSE 301-A
University of Arizona
phone: (520) 358 7400
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