Positive interactions and ecosystem function in deserts
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Transcript of Positive interactions and ecosystem function in deserts
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positive interactions & ecosystem function in deserts
@cjlortie
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theory time
rich & controversial dialogue in community ecology
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community assemblygradients
negative versus positive interactionsplant-animal interactions
community resilienceinvasive species
foundation versus keystone speciesstress-gradient hypothesis
collapse
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the sure-thing principle from the philosophy of causality
Savage (1954), Pearl (2016)
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Simpson’s paradox
(x,y) <- z
Simpson (1951), Blyth (1972)
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Simpson’s paradox in ecology is context dependency
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Chamberlain et al 2014
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150 years of competition research
grasslands
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25 years of facilitation research
deserts
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grasslands versus deserts
Germano et al. 2011
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grasslands versus deserts
Germano et al. 2011
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grasslands versus deserts
Germano et al. 2011
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deserts
Germano et al. 2011
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deserts
Germano et al. 2011
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deserts
Germano et al. 2011
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alternative ecosystem classification = different management strategies
Germano et al. 2011
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alternative ecosystem classification = different ecological theories
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the sure-thing in desert communities
positive plant interactions
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the sure-thing in desert communities
positive plant interactions
(+, 0)
(+, +)
(+,-)
+ net outcome
facilitation
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the sure-thing in desert communities
Bertness & Callaway 1994
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He et al. 2013
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frequency does not necessarily = importance in communities
Brooker (2010), Kikvidze et al. (2011)
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facilitation theory: assembly
Lortie et al. 2004
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facilitation theory: diversity
Michalet et al. 2006
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facilitation theory: niche
Bulleri et al 2015
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facilitation theory: function
Lortie et al. 2016
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facilitation theory: ecosystem function
carbon capturewater retention
pollinatorsmoderating climate
reduced evaporation transpirationrefuges
biodiversityfood
pollinator maintenance
function research decoupled from interactions
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shrubs in the San Joaquin Desert
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ecological function of shrubs in San Joaquin Desert
niche theory for the San Joaquin Desert
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test1. niche & ranges
Sotomayor et al. (2016)
Hypothesis: Dominant plants in deserts provide additional fundamental niches for protégé species expanding their ranges.
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test1. niche & ranges for local plant species
Sotomayor et al. (2016)
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test1. niche & ranges for local plant species
Sotomayor et al. (2016)
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field tests: two-phase model
Pescador et al. (2014)
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test1I. shrub loss
Liczner, Westphal, Filazzola
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test1I. shrub loss
Liczner, Westphal, Filazzola
Hypothesis: Shrubs and shrub mimics have a positive influence on the activity of Gambelia sila by providing shelter for hunting, light, or
predators.
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test1I. shrub loss
Liczner, Westphal, Filazzola
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test1I. shrub loss
Liczner, Westphal, Filazzola
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test1I. shrub loss
Liczner, Westphal, Filazzola
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test III. regional survey of shrub effects & seed addition
Filazzola, Westphal
Hypothesis: Positive shrub-annual interactions increase with abiotic stress and reduced nutrient availability along a regional gradient of
continentality.
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test III. regional survey of shrub effects & seed addition
Filazzola, Westphal
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test III. regional survey of shrub effects & seed addition
Filazzola, Westphal
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test IV. regional survey of shrub effects
Lortie, Filazzola, Westphal
Hypothesis: Facilitation by desert shrubs within the San Joaquin Desert region is species specific.
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test IV. regional survey of shrub effects
Lortie, Filazzola, Westphal
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20142013 2015
E. californica L. tridentata E. californica L. tridentata E. californica L. tridentata
decreasing abiotic stress decreasing abiotic stress decreasing abiotic stress
test IV. regional survey of shrub effects
Lortie, Filazzola, Westphal
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test V. shrub-animal effects in the Carrizo
Noble, Westphal, Saslaw, Germano, Butterfield
Hypothesis: Desert shrubs provide direct benefits to small animals (shelter) & indirect benefits (prey & protection).
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Noble, Westphal, Saslaw, Germano, Butterfield
test V. shrub-animal effects in the Carrizo
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Noble, Westphal, Saslaw, Germano, Butterfield
test V. shrub-animal effects in the Carrizo
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Noble, Westphal, Saslaw, Germano, Butterfield
test V. shrub-animal effects in the Carrizo
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440,000 pictures
~0.5% animal detection rate
presence of listed species
Noble, Westphal, Saslaw, Germano, Butterfield
test V. shrub-animal effects in the Carrizo
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test VI. climate mediation by shrubs in the Cuyama Valley
Lortie, Filazzola, Westphal, Butterfield
Hypothesis: Shrubs directly and indirectly buffer local changes in the microenvironment thereby functioning as refuges for other species
within regions subject to dramatic global change drivers.
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test VI. climate mediation by shrubs in the Cuyama Valley
Lortie, Filazzola, Westphal, Butterfield
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test VI. climate mediation by shrubs in the Cuyama Valley
Lortie, Filazzola, Westphal, Butterfield
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test VI. climate mediation by shrubs in the Cuyama Valley
Lortie, Filazzola, Westphal, Butterfield
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test VI. climate mediation by shrubs in the Cuyama Valley
Lortie, Filazzola, Westphal, Butterfield
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test VI. climate mediation by shrubs in the Cuyama Valley
Lortie, Filazzola, Westphal, Butterfield
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test VI. climate mediation by shrubs in the Cuyama Valley
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test VII. shrub-pollinator functions
Ruttan
Hypothesis: Shrub resource islands have positive, non-additive effects on pollinator communities.
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test VII. shrub-pollinator functions
Ruttan
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implications & opportunities
shrubs are a lucky charm for experimental structure & restorationin deserts
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implications & opportunities
other taxaconnections to shared data
informed management
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