Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How to model marine reserves ?   The safeguarding of resources is one of the principal subjects of halieutics
studies. Among the solutions proposed to avert the disappearance of species,
the setting in place of no take reserves is often mentioned. Most work on this
subject, theoretical as well as applied, was undertaken in recent years. In
this paper, we seek to compare two different models presented in existing
literature by highlighting their underlying assumptions. Both models were
derived from what is often referred to as the "model of Schaefer-Clark"
(reference to the work of the last author on Mathematical Bioeconomics : Clark
[7]). We show that various variations of this model lead to properties that can
be very different.

16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con