Effect of randomly fluctuating environment on autotroph-herbivore model system

On a three-tier ecological food chain model with deterministic and random harvesting: A mathematical study

Abstract. In the present study, we consider a nutrient-autotroph-herbivore ecosystem model where the herbivore species is assumed to have a commercial value. We use a Holling type-II harvest function to model density dependent herbivore harvesting. Stability criteria of the resulting model is investigated both from analytical and numerical viewpoints. The investigation revealed the existence of...

L ETTER Predator effects on herbivore and plant stability

Benjamin S. Halpern,* Elizabeth T. Borer, Eric W. Seabloom and Jonathan B. Shurin National Center for Ecological Analysis and Synthesis, 735 State St., Santa Barbara, CA 93101, USA Dept. of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060, USA Dept. of Zoology, Oregon State University, Corvallis, OR 97331, USA Dept. of Zoology, University of British Columbia, 627...

Comparing the Ecological Stoichiometry in Green and Brown Food Webs – A Review and Meta-analysis of Freshwater Food Webs

The framework of ecological stoichiometry was developed primarily within the context of "green" autotroph-based food webs. While stoichiometric principles also apply in "brown" detritus-based systems, these systems have been historically understudied and differ from green ones in several important aspects including carbon (C) quality and the nutrient [nitrogen (N) and phosphorus (P)] contents o...

Dynamics of a discrete-time plant-herbivore model

Nitrogen limitation and life history adaptation in the grasshopper Omocestus viridulus

The effect of low host plant nitrogen (N) content on herbivore performance has rarely been studied together with the herbivore’s feeding behaviour. We explored this relationship with juvenile Omocestus viridulus (Orthoptera: Acrididae) grasshoppers using fertilized and unfertilized host grasses. Due to lower growth rates, grasshoppers reared on N-poor grasses exhibited slightly prolonged develo...