Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Understanding and characterizing nestedness in mutualistic bipartite
  networks   In this work we present a dynamical model that succesfully describes the
organization of mutualistic ecological systems. The main characteristic of
these systems is the nested structure of the bipartite adjacency matrix
describing their interactions. We introduce a nestedness coefficient, as an
alternative to the Atmar and Patterson temperature, commonly used to measure
the nestedness degree of the network. This coefficient has the advantage of
being based on the robustness of the ecological system and it is not only
describing the ordering of the bipartite matrix but it is also able to tell the
difference, if any, between the degree of organization of each guild.

29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int