Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of salinity and fish predation on zooplankton dynamics in
  Hooghly-Matla estuarine system, India   The Hooghly-Matla estuarine complex is the unique estuarine system of the
world. Nutrient from the litterfall enrich the adjacent estuary through tidal
influence which in turn regulate the phytoplankton, zooplankton and fish
population dynamics. Environmental factors regulate the biotic components of
the system, among which salinity plays a leading role in the regulation of
phytoplankton, zooplankton and fish dynamics of the estuary. In this article, a
$PZF$ model is considered with Holling type-II response function. The present
model considers salinity based equations on plankton dynamics of the estuary.
The interior equilibrium is considered as the most important equilibrium state
of this model. The model equations are solved both analytically and numerically
using the real data base of Hooghly-Matla estuarine system. The essential
mathematical features of the present model have been analyzed thorough local
and global stability and the bifurcations arising in some selected situations.
A combination of set of values of the salinity of the estuary are identified
that helped to determine the sustenance of fish population in the system. The
ranges of salinity under which the system undergoes Hopf bifurcation are
determined. Numerical illustrations are performed in order to validate the
applicability of the model under consideration.

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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin