Food web model to assess the fishing impacts and ecological role of elasmobranchs in a coastal ecosystem of Southern Brazil

2021 ◽  
Author(s):  
Aurora Rupp ◽  
Hugo Bornatowski
Keyword(s):  
Food Web ◽  
Coastal Ecosystem ◽  
Southern Brazil ◽  
Ecological Role ◽  
Fishing Impacts ◽  
Food Web Model

scholarly journals Role of detritus in a spatial food web model with diffusion

2014 ◽  
Vol 89 (5) ◽  
Author(s):  
Andrzej Pękalski ◽  
Janusz Szwabiński
Keyword(s):  
Food Web ◽  
Food Web Model

Ecosystem structure and fishing impacts in the northwestern Mediterranean Sea using a food web model within a comparative approach

2015 ◽  
Vol 148 ◽  
pp. 183-199 ◽  
Author(s):  
Xavier Corrales ◽  
Marta Coll ◽  
Samuele Tecchio ◽  
José María Bellido ◽  
Ángel Mario Fernández ◽  
...  
Keyword(s):  
Food Web ◽  
Mediterranean Sea ◽  
Comparative Approach ◽  
Ecosystem Structure ◽  
Northwestern Mediterranean Sea ◽  
Fishing Impacts ◽  
Northwestern Mediterranean ◽  
Food Web Model

scholarly journals The Dynamics of a Food Web System: Role of a Prey Refuge Depending on Both Species

2021 ◽  
pp. 639-657
Author(s):  
Ekhlas Abd Al-Husain Jabr ◽  
Dahlia Khaled Bahlool
Keyword(s):  
Food Web ◽  
Equilibrium Points ◽  
Uniform Boundedness ◽  
Prey Refuge ◽  
Stable Point ◽  
Predator Species ◽  
Periodic Dynamics ◽  
The Web ◽  
Food Web Model

This paper aims to study the role of a prey refuge that depends on both prey and predator species on the dynamics of a food web model. It is assumed that the food transfer among the web levels occurs according to Lotka-Volterra functional response. The solution properties, such as existence, uniqueness, and uniform boundedness, are discussed. The local, as well as the global, stabilities of the solution of the system are investigated. The persistence of the system is studied with the assistance of average Lyapunov function. The local bifurcation conditions that may occur near the equilibrium points are established. Finally, numerical simulation is used to confirm our obtained results. It is observed that the system has only one type of attractors that is a stable point, while periodic dynamics do not exist even on the boundary planes.

An integrated food web model to test the impact of fisheries management scenarios on the coastal ecosystem of Vietnam

2014 ◽  
Vol 92 ◽  
pp. 74-86 ◽  
Author(s):  
Pham Viet Anh ◽  
Frederik De Laender ◽  
Gert Everaert ◽  
Chu Tien Vinh ◽  
Peter Goethals
Keyword(s):  
Food Web ◽  
Fisheries Management ◽  
Coastal Ecosystem ◽  
Management Scenarios ◽  
The Impact ◽  
Food Web Model

Developing a high taxonomic resolution food web model to assess the functional role of forage fish in the California Current ecosystem

2016 ◽  
Vol 335 ◽  
pp. 87-100 ◽  
Author(s):  
Laura E. Koehn ◽  
Timothy E. Essington ◽  
Kristin N. Marshall ◽  
Isaac C. Kaplan ◽  
William J. Sydeman ◽  
...  
Keyword(s):  
Food Web ◽  
Functional Role ◽  
California Current ◽  
Taxonomic Resolution ◽  
Forage Fish ◽  
Food Web Model

NETWORK ANALYSIS OF A BENTHIC FOOD WEB MODEL OF A PARTLY RECLAIMED ISLAND IN THE SUNDARBAN MANGROVE ECOSYSTEM, INDIA

2000 ◽  
Vol 08 (03) ◽  
pp. 263-278 ◽  
Author(s):  
SANTANU RAY ◽  
ROBERT E. ULANOWICZ ◽  
N. C. MAJEE ◽  
A. B. ROY
Keyword(s):  
Network Analysis ◽  
Food Web ◽  
Anthropogenic Impacts ◽  
Mangrove Ecosystem ◽  
Large Contribution ◽  
Total System ◽  
Sundarban Mangrove ◽  
System Input ◽  
Food Web Model

Network analysis is performed on a 14 species food web model of the ecosystem occupying a mudflat on a partly reclaimed island of the Sundarban mangrove ecosystem. The results demonstrate a dramatic difference between this heavily impacted mangrove ecosystem in its modes of primary and secondary production and its diminished role of detritus vis-a-vis its less disturbed counterparts. Unlike most benthic mangrove systems, the Sundarban bottom community receives a large contribution from the phytoplankton populations. In this system herbivory and detritivory are virtually equal, in contrast to the usual herbivory:detritivory ratio of 1:5. Anthropogenic impacts have changed the physiography of this system so as to increase the relative importance of zooplankton and meiobenthos as herbivores. Although a slight degree of omnivory is exhibited by the populations of larger organisms, all flows of each integer of trophic length into a food chain may be aggregated that represents the underlying trophic status of the starting food web. Only a small number of pathways of recycle can be identified (31), and the Finn cycling index for this system is quite low (8.4%). Litterfall comprises only 16% of the total system input, which is very little in comparison with most mangrove systems. Pathway redundancy is rather high in this ecosystem, indicating that the surviving system is probably highly resilient to further perturbations, as one might expect for a highly impacted system.

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