scholarly journals Individual phenotypic variation reduces interaction strengths in a consumer–resource system

2014 ◽  
Vol 4 (18) ◽  
pp. 3703-3713 ◽  
Author(s):  
Jean P. Gibert ◽  
Chad E. Brassil
Keyword(s):  
Phenotypic Variation ◽  
Resource System ◽  
Consumer Resource

MODELING TOXIC STRESS BY ATRAZINE IN A MARINE CONSUMER-RESOURCE SYSTEM

2013 ◽  
Vol 32 (5) ◽  
pp. 1088-1095 ◽  
Author(s):  
Lisette De Hoop ◽  
Marleen De Troch ◽  
A. Jan Hendriks ◽  
Frederik De Laender
Keyword(s):  
Toxic Stress ◽  
Resource System ◽  
Consumer Resource

Cannibalism in Size-Structured Systems

2013 ◽  
Author(s):  
André M. de Roos ◽  
Lennart Persson
Keyword(s):  
Population Dynamics ◽  
Population Level ◽  
Metabolic Rates ◽  
Intraspecific Interaction ◽  
Individual Level ◽  
Structured Systems ◽  
Level Model ◽  
Continuous Population ◽  
Resource System ◽  
Consumer Resource

The previous two chapters discussed how the size scaling of foraging and metabolic rates affected the dynamics of consumer-resource systems. Using different modeling approaches, it was shown that stage-dependent competitive ability was the main predictor of population dynamics; that is, it largely set the conditions for different types of cycles to occur. This chapter adds another intraspecific interaction on top of the consumer-resource system, namely, cannibalism. It uses a discrete-continuous population-level model based on individual-level net-production energetics to investigate the effects of cannibalism. The focus will be on the effects of cannibalism on population dynamics related to four processes that have been discussed in the literature regarding cannibalism: effects on mortality, competition, energy gain, and the size dependence of interactions.

scholarly journals Local Interactions Affect Spread of Resource in a Consumer-resource System With Group Defense

2021 ◽  
Author(s):  
Jorge Arroyo-Esqu ◽  
Alan Hastings ◽  
Marissa L. Baskett
Keyword(s):  
Defense Mechanisms ◽  
Life Cycle Stage ◽  
Ecological Interactions ◽  
Resource Population ◽  
High Resource ◽  
Type Iv ◽  
Spread Dynamics ◽  
Group Defense ◽  
Resource System ◽  
Consumer Resource

Abstract Integrodifference equations are a discrete time spatially explicit model that describes dispersal of ecological populations through space. This framework is useful to study spread dynamics of organisms and how ecological interactions can affect their spread. When studying interactions such as consumption, dispersal rates might vary with life cycle stage, such as cases with dispersive juveniles and sessile adults. In the non-dispersive stage, resources may engage in group defense to protect themselves from consumption. These local nondispersive interactions may limit the number of dispersing recruits that are produced and therefore affect how fast populations can spread. We present a spatial consumer-resource system using an integrodifference framework with limited movement of their adult stages and group defense mechanisms in the resource population. We model group defense using a Type IV Holling functional response, which limits survival of adult resource population and enhances juvenile consumers production. We find that high mortality levels for sessile adults can destabilize resource at carrying capacity. Furthermore, we find that at high resource densities, group defense leads to a slower local growth of resource in newly invaded regions due to intraspecific competition outweighing the effect of consumption on resource growth.

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