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

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

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.

Functional role of the soft coral Dendronephthya australis in the benthic food web of temperate estuaries

2018 ◽  
Vol 593 ◽  
pp. 61-72 ◽  
Author(s):  
M Corry ◽  
D Harasti ◽  
T Gaston ◽  
D Mazumder ◽  
T Cresswell ◽  
...  
Keyword(s):  
Food Web ◽  
Functional Role ◽  
Soft Coral ◽  
Benthic Food Web ◽  
Benthic Food

scholarly journals Aggregating a Plankton Food Web: Mathematical versus Biological Approaches

Mathematics ◽  
2018 ◽  
Vol 6 (12) ◽  
pp. 336 ◽  
Author(s):  
Ferenc Jordán ◽  
Anett Endrédi ◽  
Wei-chung Liu ◽  
Domenico D’Alelio
Keyword(s):  
Network Analysis ◽  
Food Web ◽  
Food Webs ◽  
Functional Role ◽  
Alternative Perspective ◽  
Connection Pattern ◽  
Unique Species ◽  
Topological Position ◽  
Biological Nature

Species are embedded in a web of intricate trophic interactions. Understanding the functional role of species in food webs is of fundamental interests. This is related to food web position, so positional similarity may provide information about functional overlap. Defining and quantifying similar trophic functioning can be addressed in different ways. We consider two approaches. One is of mathematical nature involving network analysis where unique species can be defined as those whose topological position is very different to others in the same food web. A species is unique if it has very different connection pattern compared to others. The second approach is of biological nature, based on trait-based aggregations. Unique species are not easy to aggregate with others because their traits are not in common with the ones of most others. Our goal here is to illustrate how mathematics can provide an alternative perspective on species aggregation, and how this is related to its biological counterpart. We illustrate these approaches using a toy food web and a real food web and demonstrate the sensitive relationships between those approaches. The trait-based aggregation focusing on the trait values of size (sv) can be best predicted by the mathematical aggregation algorithms.

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.

scholarly journals A multi-model approach to understanding the role of Pacific sardine in the California Current food web

2019 ◽  
Vol 617-618 ◽  
pp. 307-321 ◽  
Author(s):  
IC Kaplan ◽  
TB Francis ◽  
AE Punt ◽  
LE Koehn ◽  
E Curchitser ◽  
...  
Keyword(s):  
Food Web ◽  
California Current ◽  
Pacific Sardine ◽  
Model Approach

scholarly journals Trade-offs between forage fish fisheries and their predators in the California Current

2017 ◽  
Vol 74 (9) ◽  
pp. 2448-2458 ◽  
Author(s):  
Laura E Koehn ◽  
Timothy E Essington ◽  
Kristin N Marshall ◽  
William J Sydeman ◽  
Amber I Szoboszlai ◽  
...  
Keyword(s):  
Equilibrium Model ◽  
Marine Mammals ◽  
California Current ◽  
Economic Benefits ◽  
Taxonomic Resolution ◽  
Forage Fish ◽  
Piscivorous Fish ◽  
Functional Relationships ◽  
Trade Offs ◽  
Generalized Equilibrium

Abstract Forage fish generate economic benefits through directed fisheries, but also generate benefits through their role as prey to other valued species (large piscivorous fish, seabirds, and marine mammals). Previous evaluations of the ecosystem consequences of forage fish fisheries used models with coarse taxonomic resolution of forage fish and their predators. Here, we quantify trade-offs between forage fish fisheries and predator fisheries, and between forage fish fisheries and species of conservation interest in the California Current, using a taxonomically detailed foodweb model and a generalized equilibrium model. We propagated uncertainty in trade-offs to forage fish fishing based on uncertainty in foodweb model parameterization and uncertainty in predator–prey functional relationships in the generalized equilibrium model. The model predicted loss in catch of some higher trophic level fisheries [mainly salmon (Oncorhynchus sp.) and halibut (Paralichthys californicus)] from fishing sardine (Sardinops sagax), anchovy (Engraulis mordax), herring (Clupea pallasii), or aggregated forage fish, but the lost economic revenue from predators never exceeded the economic benefit from additional forage fish catch. Predicted reductions in biomass of seabirds and marine mammals were sufficiently large that, depending on the value of these nonmarket species, consideration of nonmarket predators could tip the balance of trade-offs toward conservation of forage fish and away from harvest. This work highlights specific predators [brown pelicans (Pelecanus occidentalis), marbled murrelets (Brachyramphus marmoratus), multiple other seabirds, sea lions (Zalophus californianus and Eumetopias jubatus), baleen whales (Mysticeti)] that are potentially sensitive to specific forage fish fisheries in the California Current.

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