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This section is a gallery of networks. It attempts to generate ideas and open questions by visualizing networks.

Figure 1: Cohesion: Nodes are species and links are trophic interactions (presence/absence).


Figure 2: Asymmetry: Nodes are species. The difference in strength in the two links connecting each pair of species represents the asymmetry between those two species. Black and grey nodes are different ecological communities. For example plants and pollinators.


  
Figure 3: Interaction strength: Nodes are species and links trophic interactions. Left: Nodes are species and links represent the strength of the interaction between each pair of species. Right: the same data set but with species ordered by the mean size of each species (rectangle). The strength of each interaction increases from white (weak) to black (strong).



Figure 4: Modules: Nodes are species and links trophic interactions. Yellow: Simple trophic chain. Black: Omnivory. Blue: Apparent competition. Red: Intraguild predation. Modules are within more complex structures.


Figure 5: Two interaction types: Nodes are species and links trophic interactions. a, Simple module with a plant-herbivore-pollinator. b, Left (1): Herbivores. Center (2): Plants. Right (3): Pollinators and (4): Vertebrates (Birds and Mammals) dispersers of seeds.
            
Figure 6: Modules in space: networks (in this case food web modules) can be represented in space. Habitats: m, mangrove/estuaries, c, coral reefs, r, offshore reefs, s, sand areas, and a sea grass/algal mats. Left, Simple trophic chains, Right, Trophic chain with omnivory. The strength of the links in space represents two habitats sharing more number of trophic chains than the expected values after randomizations.


         
Figure 7: Spatial networks: A more complicated representation of networks in space. Left, The size of each sampled habitat represents the total number of tritrophic chains (α-tritrophic diversity). Center, The sites where the most common tritrophic chain is present. The distribution of chains in space represents the γ-tritrophic diversity. Right, Represents the spatial network. Each link means that two sites share more similar tritrophic chains than expected under different models. The spatial “dissimilarity network” represents the β-tritrophic diversity.


Figure 8: Spatio-temporal dynamics of individual based food webs: An individual based food web in space (salinity) and time (temperature). y-axis represents the total number of individuals sampled in each food web in space and time. In this case, predators are represented as individuals. The strength of each link represents the number of individual preys found in the stomach content of one individual predator.


Figure 9: Temporal dynamics of networks: Represents the temporal dynamics of resource use by frugivorous birds. Right column, plants (circles represent the abundance in seeds), Left column, birds (circles represent the abundance in number of individuals)


Figure 10: Multilevel networks: Nodes are individuals. Individuals are connected according to mating (within each population) and trophic (between populations) interactions.


 November 18, 2009

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