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Amelia Lamb
1st Progress Report
March 19th 2013
Shrub and understory annual plant
effects on resident kangaroo rat
species...
Introduction
Facilitation in plant communities
MacIntire and Fajardo 2014; Pugnaire et al. 2011; Soliveres et al. 2011; Ho...
Introduction
The Stress Gradient Hypothesis (SGH)
Michelet et al. 2013; Holmgren 2010; Malkinson 2010; Maestre et al. 2009...
Introduction
Armas and Pugnaire 2005; Gomez-Aparicio et al. 2004; Flores and Jurado 2003; Holzapfel 1999; Pugnaire et al ....
Introduction
Systematic Review
• Purpose: summarize literature to identify extensively studied
areas/research gaps
• Criteria: papers t...
Chapter 1
Geographic Distribution of Previous Studies
Study Site and Species
Study Site and Species
Study Site and Species
Survey
• Purpose: examine the
impact of shrubs and
annuals on animal
activity along a
gradient
• 5-point gradient- sites
d...
Chapter 2
Activity Measurements
-burrows
-scat
-tracks
-trails
-total disturbance
Shrub/Annual Measurements
-shrub dimensi...
Chapter 2
0.00
0.10
0.20
0.30
0.40
0.50
Open Shrub
NumberofBurrows
Microsite
Kangaroo rat foraging patterns and GUD
Chapter 3
• Purpose: examine the
impact of shrubs and
annuals on foraging
patterns ...
Methods
• Trays: reinforced aluminum foil; sifted sand; millet seed
• Shrub side: positioned under north side near base an...
Current Objectives
• Lab
• Finish extracting systematic review data
• Begin writing review
• Finish analyzing data from pi...
Thank You!
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Amy lamb progress report

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Amy lamb progress report

  1. 1. Amelia Lamb 1st Progress Report March 19th 2013 Shrub and understory annual plant effects on resident kangaroo rat species in a desert annual community
  2. 2. Introduction Facilitation in plant communities MacIntire and Fajardo 2014; Pugnaire et al. 2011; Soliveres et al. 2011; Holmgren and Scheffer 2010; Brooker et al. 2008; Bruno et al. 2003; Holmgren et al. 1997; Callaway and Walker 1997; Pugnaire et al. 1996.
  3. 3. Introduction The Stress Gradient Hypothesis (SGH) Michelet et al. 2013; Holmgren 2010; Malkinson 2010; Maestre et al. 2009; Brooker et al. 2008; Kawai et al. 2007; Lortie and Callaway 2006; Maestre et al. 2006; Callaway and Walker 1994.
  4. 4. Introduction Armas and Pugnaire 2005; Gomez-Aparicio et al. 2004; Flores and Jurado 2003; Holzapfel 1999; Pugnaire et al . 1996; Callaway 1995. Nurse Plants
  5. 5. Introduction
  6. 6. Systematic Review • Purpose: summarize literature to identify extensively studied areas/research gaps • Criteria: papers testing positive interactions/animal side of interaction • Search: Web of knowledge (shrub*+animal*) • 844 articles • 122 articles retained • Data: direct/indirect; nature of interaction; reciprocal interactions; study species; climate; GPS Chapter 1
  7. 7. Chapter 1 Geographic Distribution of Previous Studies
  8. 8. Study Site and Species
  9. 9. Study Site and Species
  10. 10. Study Site and Species
  11. 11. Survey • Purpose: examine the impact of shrubs and annuals on animal activity along a gradient • 5-point gradient- sites differ by 200 meters • Microsites- shrub vs. open • Replicates- 100 pairs/sub-site • Treatments-annuals removed (50 pairs) annuals intact (50 pairs) Chapter 2
  12. 12. Chapter 2 Activity Measurements -burrows -scat -tracks -trails -total disturbance Shrub/Annual Measurements -shrub dimensions -annual abundance -annual diversity -percent cover Environmental Measurements -elevation -temperature -humidity Survey
  13. 13. Chapter 2 0.00 0.10 0.20 0.30 0.40 0.50 Open Shrub NumberofBurrows Microsite
  14. 14. Kangaroo rat foraging patterns and GUD Chapter 3 • Purpose: examine the impact of shrubs and annuals on foraging patterns and GUD • 5-point gradient: sites differ by 200 meters • Microsites: shrub vs. open • # of Trials: 10-15 • Replicates: 3/treatment/sub-site (60 trays) • Treatments: annuals removed; annuals intact
  15. 15. Methods • Trays: reinforced aluminum foil; sifted sand; millet seed • Shrub side: positioned under north side near base and adjacent open area • Set up: before sunset; flatten surface; set up cameras; collect trays/cameras before sunrise; record activity; sieve contents; weigh remaining seeds • Pilot study: krats ate seeds; cameras recorded krat activity. Chapter 3
  16. 16. Current Objectives • Lab • Finish extracting systematic review data • Begin writing review • Finish analyzing data from pilot survey and GUD trials • Field (April 15th – May 30th) • Extensive survey of Larrea tridentata and associated annual vegetation and animal activity (at least 100 paired shrub/open site per elevational sub-site) • 10-15 GUD trials; 4 treatments; 3 replicates per treatment in each elevational sub-site (60 trays/trial)
  17. 17. Thank You!

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