Don DeAngelis, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 195
Dynamics of a plant-herbivore-predator system with plant-toxicity Dynamics of a plant-herbivore-predator system with plant-toxicity
A system of ordinary differential equations is considered that models the interactions of two plant species populations, an herbivore population, and a predator population. We use a toxin-determined functional response to describe the interactions between plant species and herbivores and use a Holling Type II functional response to model the interactions between herbivores and predators...
Authors
Zhilan Feng, Zhipeng Qiu, Rongsong Liu, Donald DeAngelis
Transitions of interaction outcomes in a uni-directional consumer-resource system Transitions of interaction outcomes in a uni-directional consumer-resource system
A uni-directional consumer–resource system of two species is analyzed. Our aim is to understand the mechanisms that determine how the interaction outcomes depend on the context of the interaction; that is, on the model parameters. The dynamic behavior of the model is described and, in particular, it is demonstrated that no periodic orbits exist. Then the parameter (factor) space is shown...
Authors
Y. Wang, Donald DeAngelis
A predator-prey model with a holling type I functional response including a predator mutual interference A predator-prey model with a holling type I functional response including a predator mutual interference
The most widely used functional response in describing predator-prey relationships is the Holling type II functional response, where per capita predation is a smooth, increasing, and saturating function of prey density. Beddington and DeAngelis modified the Holling type II response to include interference of predators that increases with predator density. Here we introduce a predator...
Authors
G. Seo, D.L. DeAngelis
Uni-directional consumer-resource theory characterizing transitions of interaction outcomes Uni-directional consumer-resource theory characterizing transitions of interaction outcomes
A resource is considered here to be a biotic population that helps to maintain the population growth of its consumers, whereas a consumer utilizes a resource and in turn decreases its growth rate. Bi-directional consumer–resource (C–R) interactions have been the object of recent theory. In these interactions, each species acts, in some respects, as both a consumer and a resource of the...
Authors
Y. Wang, D.L. DeAngelis, J.N. Holland
Using data from an encounter sampler to model fish dispersal Using data from an encounter sampler to model fish dispersal
A method to estimate speed of free-ranging fishes using a passive sampling device is described and illustrated with data from the Everglades, U.S.A. Catch per unit effort (CPUE) from minnow traps embedded in drift fences was treated as an encounter rate and used to estimate speed, when combined with an independent estimate of density obtained by use of throw traps that enclose 1 m2 of...
Authors
A. Obaza, D.L. DeAngelis, J.C. Trexler
The effect of travel loss on evolutionarily stable distributions of populations in space The effect of travel loss on evolutionarily stable distributions of populations in space
A key assumption of the ideal free distribution (IFD) is that there are no costs in moving between habitat patches. However, because many populations exhibit more or less continuous population movement between patches and traveling cost is a frequent factor, it is important to determine the effects of costs on expected population movement patterns and spatial distributions. We consider a...
Authors
Donald DeAngelis, G.S.K. Wolkowicz, Y. Lou, Y. Jiang, M. Novak, R. Svanback, M.S. Araujo, Y.S. Jo, E.A. Cleary
Ecological models supporting environmental decision making: A strategy for the future Ecological models supporting environmental decision making: A strategy for the future
Ecological models are important for environmental decision support because they allow the consequences of alternative policies and management scenarios to be explored. However, current modeling practice is unsatisfactory. A literature review shows that the elements of good modeling practice have long been identified but are widely ignored. The reasons for this might include lack of...
Authors
Amelie Schmolke, Pernille Thorbek, Donald L. DeAngelis, Volker Grimm
A consumer-resource approach to the density-dependent population dynamics of mutualism A consumer-resource approach to the density-dependent population dynamics of mutualism
Like predation and competition, mutualism is now recognized as a consumer resource (C-R) interaction, including, in particular, bi-directional (e.g., coral, plant- mycorrhizae) and uni-directional (e.g., ant-plant defense, plant-pollinator) C-R mutualisms. Here, we develop general theory for the density-dependent population dynamics of mutualism based on the C-R mechanism of...
Authors
J. Holland, Donald L. DeAngelis
Modeling seasonal dynamics of small fish cohorts in fluctuating freshwater marsh landscapes Modeling seasonal dynamics of small fish cohorts in fluctuating freshwater marsh landscapes
Small-bodied fishes constitute an important assemblage in many wetlands. In wetlands that dry periodically except for small permanent waterbodies, these fishes are quick to respond to change and can undergo large fluctuations in numbers and biomasses. An important aspect of landscapes that are mixtures of marsh and permanent waterbodies is that high rates of biomass production occur in...
Authors
Fred Jopp, Donald L. DeAngelis, Joel Trexler
Ecological hierarchies and self-organisation - Pattern analysis, modelling and process integration across scales Ecological hierarchies and self-organisation - Pattern analysis, modelling and process integration across scales
A continuing discussion in applied and theoretical ecology focuses on the relationship of different organisational levels and on how ecological systems interact across scales. We address principal approaches to cope with complex across-level issues in ecology by applying elements of hierarchy theory and the theory of complex adaptive systems. A top-down approach, often characterised by...
Authors
H. Reuter, F. Jopp, J. Blanco-Moreno, C. Damgaard, Y. Matsinos, D.L. DeAngelis
Challenges and opportunities for integrating lake ecosystem modelling approaches Challenges and opportunities for integrating lake ecosystem modelling approaches
A large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others (‘reinventing the wheel’). The other challenge is to avoid focusing on only one type of model, while...
Authors
Wolf Mooij, Dennis Trolle, Erik Jeppesen, George Arhonditsis, Pavel Belolipetsky, Deonatus Chitamwebwa, Andrey Degermendzhy, Donald L. DeAngelis, Lisette Domis, Andrea S. Downing, J. Elliott, Carlos Fragoso, Ursula Gaedke, Svetlana Genova, Ramesh Gulati, Lars Hakanson, David P. Hamilton, Matthew R. Hipsey, Jochem Hoen, Stephan Hulsmann, F. Los, Vardit Makler-Pick, Thomas Petzoldt, Igor Prokopkin, Karsten Rinke, Sebastiaan Schep, Koji Tominaga, Anne A. Van Dam, Egbert Van Nes, Scott Wells, Jan H. Janse
Match or mismatch: The influence of phenology on size-dependent life history and divergence in population structure Match or mismatch: The influence of phenology on size-dependent life history and divergence in population structure
1. In gape-limited predators, body size asymmetries determine the outcome of predator-prey interactions. Due to ontogenetic changes in body size, the intensity of intra- and interspecific interactions may change rapidly between the match situation of a predator-prey system and the mismatch situation in which competition, including competition with the prey, dominates. 2. Based on a...
Authors
Jost Borcherding, Peter Beeck, Donald L. DeAngelis, Werner Scharf
Science and Products
Filter Total Items: 195
Dynamics of a plant-herbivore-predator system with plant-toxicity Dynamics of a plant-herbivore-predator system with plant-toxicity
A system of ordinary differential equations is considered that models the interactions of two plant species populations, an herbivore population, and a predator population. We use a toxin-determined functional response to describe the interactions between plant species and herbivores and use a Holling Type II functional response to model the interactions between herbivores and predators...
Authors
Zhilan Feng, Zhipeng Qiu, Rongsong Liu, Donald DeAngelis
Transitions of interaction outcomes in a uni-directional consumer-resource system Transitions of interaction outcomes in a uni-directional consumer-resource system
A uni-directional consumer–resource system of two species is analyzed. Our aim is to understand the mechanisms that determine how the interaction outcomes depend on the context of the interaction; that is, on the model parameters. The dynamic behavior of the model is described and, in particular, it is demonstrated that no periodic orbits exist. Then the parameter (factor) space is shown...
Authors
Y. Wang, Donald DeAngelis
A predator-prey model with a holling type I functional response including a predator mutual interference A predator-prey model with a holling type I functional response including a predator mutual interference
The most widely used functional response in describing predator-prey relationships is the Holling type II functional response, where per capita predation is a smooth, increasing, and saturating function of prey density. Beddington and DeAngelis modified the Holling type II response to include interference of predators that increases with predator density. Here we introduce a predator...
Authors
G. Seo, D.L. DeAngelis
Uni-directional consumer-resource theory characterizing transitions of interaction outcomes Uni-directional consumer-resource theory characterizing transitions of interaction outcomes
A resource is considered here to be a biotic population that helps to maintain the population growth of its consumers, whereas a consumer utilizes a resource and in turn decreases its growth rate. Bi-directional consumer–resource (C–R) interactions have been the object of recent theory. In these interactions, each species acts, in some respects, as both a consumer and a resource of the...
Authors
Y. Wang, D.L. DeAngelis, J.N. Holland
Using data from an encounter sampler to model fish dispersal Using data from an encounter sampler to model fish dispersal
A method to estimate speed of free-ranging fishes using a passive sampling device is described and illustrated with data from the Everglades, U.S.A. Catch per unit effort (CPUE) from minnow traps embedded in drift fences was treated as an encounter rate and used to estimate speed, when combined with an independent estimate of density obtained by use of throw traps that enclose 1 m2 of...
Authors
A. Obaza, D.L. DeAngelis, J.C. Trexler
The effect of travel loss on evolutionarily stable distributions of populations in space The effect of travel loss on evolutionarily stable distributions of populations in space
A key assumption of the ideal free distribution (IFD) is that there are no costs in moving between habitat patches. However, because many populations exhibit more or less continuous population movement between patches and traveling cost is a frequent factor, it is important to determine the effects of costs on expected population movement patterns and spatial distributions. We consider a...
Authors
Donald DeAngelis, G.S.K. Wolkowicz, Y. Lou, Y. Jiang, M. Novak, R. Svanback, M.S. Araujo, Y.S. Jo, E.A. Cleary
Ecological models supporting environmental decision making: A strategy for the future Ecological models supporting environmental decision making: A strategy for the future
Ecological models are important for environmental decision support because they allow the consequences of alternative policies and management scenarios to be explored. However, current modeling practice is unsatisfactory. A literature review shows that the elements of good modeling practice have long been identified but are widely ignored. The reasons for this might include lack of...
Authors
Amelie Schmolke, Pernille Thorbek, Donald L. DeAngelis, Volker Grimm
A consumer-resource approach to the density-dependent population dynamics of mutualism A consumer-resource approach to the density-dependent population dynamics of mutualism
Like predation and competition, mutualism is now recognized as a consumer resource (C-R) interaction, including, in particular, bi-directional (e.g., coral, plant- mycorrhizae) and uni-directional (e.g., ant-plant defense, plant-pollinator) C-R mutualisms. Here, we develop general theory for the density-dependent population dynamics of mutualism based on the C-R mechanism of...
Authors
J. Holland, Donald L. DeAngelis
Modeling seasonal dynamics of small fish cohorts in fluctuating freshwater marsh landscapes Modeling seasonal dynamics of small fish cohorts in fluctuating freshwater marsh landscapes
Small-bodied fishes constitute an important assemblage in many wetlands. In wetlands that dry periodically except for small permanent waterbodies, these fishes are quick to respond to change and can undergo large fluctuations in numbers and biomasses. An important aspect of landscapes that are mixtures of marsh and permanent waterbodies is that high rates of biomass production occur in...
Authors
Fred Jopp, Donald L. DeAngelis, Joel Trexler
Ecological hierarchies and self-organisation - Pattern analysis, modelling and process integration across scales Ecological hierarchies and self-organisation - Pattern analysis, modelling and process integration across scales
A continuing discussion in applied and theoretical ecology focuses on the relationship of different organisational levels and on how ecological systems interact across scales. We address principal approaches to cope with complex across-level issues in ecology by applying elements of hierarchy theory and the theory of complex adaptive systems. A top-down approach, often characterised by...
Authors
H. Reuter, F. Jopp, J. Blanco-Moreno, C. Damgaard, Y. Matsinos, D.L. DeAngelis
Challenges and opportunities for integrating lake ecosystem modelling approaches Challenges and opportunities for integrating lake ecosystem modelling approaches
A large number and wide variety of lake ecosystem models have been developed and published during the past four decades. We identify two challenges for making further progress in this field. One such challenge is to avoid developing more models largely following the concept of others (‘reinventing the wheel’). The other challenge is to avoid focusing on only one type of model, while...
Authors
Wolf Mooij, Dennis Trolle, Erik Jeppesen, George Arhonditsis, Pavel Belolipetsky, Deonatus Chitamwebwa, Andrey Degermendzhy, Donald L. DeAngelis, Lisette Domis, Andrea S. Downing, J. Elliott, Carlos Fragoso, Ursula Gaedke, Svetlana Genova, Ramesh Gulati, Lars Hakanson, David P. Hamilton, Matthew R. Hipsey, Jochem Hoen, Stephan Hulsmann, F. Los, Vardit Makler-Pick, Thomas Petzoldt, Igor Prokopkin, Karsten Rinke, Sebastiaan Schep, Koji Tominaga, Anne A. Van Dam, Egbert Van Nes, Scott Wells, Jan H. Janse
Match or mismatch: The influence of phenology on size-dependent life history and divergence in population structure Match or mismatch: The influence of phenology on size-dependent life history and divergence in population structure
1. In gape-limited predators, body size asymmetries determine the outcome of predator-prey interactions. Due to ontogenetic changes in body size, the intensity of intra- and interspecific interactions may change rapidly between the match situation of a predator-prey system and the mismatch situation in which competition, including competition with the prey, dominates. 2. Based on a...
Authors
Jost Borcherding, Peter Beeck, Donald L. DeAngelis, Werner Scharf