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      Dynamics of the Oxygen, Carbon Dioxide, and Water Interaction across the Insect Spiracle

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      Abstract and Applied Analysis
      Hindawi Limited

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          Abstract

          This paper explores the dynamics of respiratory gases interactions which are accompanied by the loss of water through an insect’s spiracle. Here we investigate and analyze this interaction by deriving a system of ordinary differential equations for oxygen, carbon dioxide, and water vapor. The analysis is carried out in continuous time. The purpose of the research is to determine bounds for the gas volumes and to discuss the complexity and stability of the equilibria. Numerical simulations also demonstrate the dynamics of our model utilizing the new conditions for stability and instability.

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          Coupling in predator-prey dynamics: Ratio-Dependence

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            The Orgins and Evolution of Predator-Prey Theory

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              The nature of predation: prey dependent, ratio dependent or neither?

              To describe a predator-prey relationship, it is necessary to specify the rate of prey consumption by an average predator. This functional response largely determines dynamic stability, responses to environmental influences and the nature of indirect effects in the food web containing the predator-prey pair. Nevertheless, measurements of functional responses in nature are quite rare. Recently, much work has been devoted to comparing two idealized forms of the functional response: prey dependent and ratio dependent. Although we agree that predator abundance often affects the consumption rate of individual predators, this phenomenon requires more attention. Disagreement remains over which of the two idealized responses serves as a better starting point in building models when data on predator dependence are absent.
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                Author and article information

                Journal
                Abstract and Applied Analysis
                Abstract and Applied Analysis
                Hindawi Limited
                1085-3375
                1687-0409
                2014
                2014
                : 2014
                :
                : 1-11
                Article
                10.1155/2014/157573
                fdab21f2-352e-4d76-b557-e04f39fcb3e7
                © 2014

                http://creativecommons.org/licenses/by/3.0/

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