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Ecological communities are more than the sum of their parts
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Timothée Poisot
August 10, 2016
Research
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120
Ecological communities are more than the sum of their parts
#ESA2016
Timothée Poisot
August 10, 2016
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Transcript
cb Ecological communities are more than the sum of their
parts Timothée Poisot ESA 2016, Ft. Lauderdale, FL Université de Montréal – @tpoi /
[email protected]
None
The "building blocks" of food webs
The "building blocks" of food webs
The "building blocks" of food webs
Measuring dissimilarity
Measuring dissimilarity G1 → x = f (m1, . .
. , m16)
Measuring dissimilarity G1 → x = f (m1, . .
. , m16) G2 → y = f (m1, . . . , m16)
Measuring dissimilarity G1 → x = f (m1, . .
. , m16) G2 → y = f (m1, . . . , m16) d(G1, G2) = i (xi – yi)2 = d(G2, G1) → δ
Putting the blocks together δ
Putting the blocks together δ δ
Putting the blocks together δ δ if δ < δ,
accept if δ ≥ δ, reject
Want to try? Computing resources provided by Compute Canada and
Université Laval. http://poisotlab.biol.umontreal.ca/tpoisot/mpna C, GNU GPLv3, uses igraph and gsl
Some networks are easier to simulate than others 0.0 0.2
0.4 0.6 0.8 1.0 0.0 0.2 0.4 0.6 0.8 1.0 Step Distance · 23 food webs from Interaction Web Database · 400 replicate runs (averaged) · Total runtime: 36 years
Simulated networks are wider 0.0 0.2 0.4 0.6 0.8 1.0
0 2 4 6 8 Step Diameter
Simulated networks have less top predators 0.0 0.2 0.4 0.6
0.8 1.0 0.0 0.2 0.4 0.6 0.8 1.0 Step Top predators
Simulated networks have more intermediate consumers 0.0 0.2 0.4 0.6
0.8 1.0 0 1 2 3 4 5 6 7 Step Intermediate consumers
Simulated networks have slightly less primary producers 0.0 0.2 0.4
0.6 0.8 1.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Step Primary producers
Larger networks are easier to reproduce 0 200 400 600
800 1000 0.0 0.1 0.2 0.3 0.4 0.5 0.6 Numger of interactions Distance q q q q q q q q q q q q q q q q q q q q q q q 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.1 0.2 0.3 0.4 0.5 Distance Top predators q q q q q q q q q q q q q q q q q q q q q q q
Take-home messages · Motifs are a poor predictor of food
web structure · Food web structure has additional constraints · We need to understand this as it its into ecosystem functions – Eva Delmas et al. COS 75-2 Funding: NSERC, FRQNT