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An introductory explanation of nurse-plant mechanisms and how my research will try to document them. Presented at York University as a part of their weekly graduate series seminars.
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Nurse-plant effects in arid environments and their possible usage as restoration tools
Alessandro Filazzola and Christopher LortieNovember 2013
Aral Sea
Aral Sea
Diversity of the Desert
Stress Gradient Hypothesis
Major theories examined
Malkinson & Tielbörger 2010
SGH extension to apply to disturbance◦ Biotic stress gradient
Nurse-plants can reduce disturbance ◦ Shared defences (thorns/branches)◦ Reduced palatability of neighbours◦ Associational resistance
Major theories examined
Indirect facilitation◦ Apparent competition◦ Mycorrhiza colonization◦ Seed trapping◦ Magnet species concept
Major theories examined
Molina‐Montenegro et al. 2008
Research Project
Abiotic stress amelioration
Substrate modification
Herbivore protection
Soil modificationPollinator visitation
Seed trapping
PLANT GROWTH
SEEDLINGREPRODUCTION
Nurse-mediated evolutionSEED
Nurse-mediated distribution
A conceptual framework summarizing nurse-plant mechanisms by protégé life-stage
Abiotic stress amelioration
Substrate modification
Herbivore protection
Soil modificationPollinator visitation
Seed trapping
PLANT GROWTH
SEEDLINGREPRODUCTION
Nurse-mediated evolutionSEED
Nurse-mediated distribution
A conceptual framework summarizing nurse-plant mechanisms by protégé life-stage
Nurse Mechanism
Seed Trapping
Substrate Modification
Abiotic Stress Amelioration
Herbivore Protection
Pollinator Visitation
Nurse-mediate distribution
Nurse-mediated evolution
Responding life-
stage
Seeds
Germination
Plant Growth
Reproduction
Mojave National Preserve
A – Effect of Larea spp. (+/-) on vegetation + seedbank by size + elevation (add sand disposition)B – Facilitated seed arrival of Larea spp. (+/-)C – Compare transient and persistent seedbank
2.1 313 m
2.2 515 m
2.3737 m
2.4951 m
2.51128 m
Gradient environmental measures
- Light- Temp- Moisture- Wind
Progress to date
Site 1.3North Facing
Site 1.2South Facing
Site 1.1Plateau
Panoche Hills
A – Effect of Ephedra spp. (+/-) on vegetation + seedbank by size + aspect (N,S,0)B – Facilitated seed arrival of Ephedra spp. (+/-)C – Pollinator facilitation by Ephedra spp. using pan-traps + Ipod Nanos (+/-). D – Ephedra spp. traits as a habitat for K. rats + L. lizards
Parking Lot
- Light- Temp- Moisture- Wind
Progress
Mammal/BirdExclusion
InsectExclusion
Control -No Exclusion
Control +Full Exclusion
Progress to date
Thank you!
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