Posts Tagged ‘ trophic networks ’

A (fast!) null model of bipartite networks

September 12, 2010
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A (fast!) null model of bipartite networks

One of the challenges for ecologists working with trophic/interaction networks is to understand their organization. One of the possible approaches is to compare them across a random model, with more or less constraints, in order to estimate the departure from randomness. To this effect, null models have been developed. The basic idea behind a null

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R helps reproducible research

August 5, 2010
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While reading a paper on mutualistic networks in press at Ecology, by Jimena Dorado et al., I found the following sentence in the Materials & methods section: Correlation analyses were done using the cor.test function in the basepackage of R (…)Read the rest of this entry »

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Viewing a bipartite network

July 30, 2010
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Viewing a bipartite network

A short modification of a function to draw bipartite networks in matrix form, with sorting of the network to reflect its nestedness.

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Draw a trophic network with n levels

July 6, 2010
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In the last few weeks, I started focusing more on more of trophic systems with three levels or more. I wanted something to visualize the resulting trophic network, so I came up with a little R function called draw.mnet (which stands for draw a multiple-levels network).

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