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Don DeAngelis, Ph.D. (Former Employee)

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Image: Florida Everglades

Across Trophic Level System Simulation (ATLSS) Program for the Greater Everglades

Goals of the ATLSS Program are to help achieve a better understanding of components of the Everglades ecosystem, to provide an integrative tool for empirical studies, and to apply these tools to an adaptive management framework.
By
Land Management Research Program, Wetland and Aquatic Research Center
Across Trophic Level System Simulation (ATLSS) Program for the Greater Everglades

Across Trophic Level System Simulation (ATLSS) Program for the Greater Everglades

Goals of the ATLSS Program are to help achieve a better understanding of components of the Everglades ecosystem, to provide an integrative tool for empirical studies, and to apply these tools to an adaptive management framework.
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Apple-snail-in-hand: Photo credit: John Brandauer

Joint Ecosystem Modeling: EverSnail

EverSnail, developed in collaboration with the University of West Florida, is an age- and size-structured spatially-explicit landscape model of native apple snails ( Pomacea paludosa).
By
Ecosystems Mission Area, Land Management Research Program, Species Management Research Program, Wetland and Aquatic Research Center
Joint Ecosystem Modeling: EverSnail

Joint Ecosystem Modeling: EverSnail

EverSnail, developed in collaboration with the University of West Florida, is an age- and size-structured spatially-explicit landscape model of native apple snails ( Pomacea paludosa).
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USGS science for a changing world logo

Developing the next generation of USGS resource assessments

Resource assessments constitute a key part of the USGS mission, and represent a crucial contribution toward Department of the Interior (DOI) and broader Federal objectives. Current USGS energy and mineral assessment methods evaluate total technically recoverable resources (energy) or economically exploitable materials (minerals); the fiscal year 2010 budget for this work is $82M. To help...
By
John Wesley Powell Center for Analysis and Synthesis
Developing the next generation of USGS resource assessments

Developing the next generation of USGS resource assessments

Resource assessments constitute a key part of the USGS mission, and represent a crucial contribution toward Department of the Interior (DOI) and broader Federal objectives. Current USGS energy and mineral assessment methods evaluate total technically recoverable resources (energy) or economically exploitable materials (minerals); the fiscal year 2010 budget for this work is $82M. To help stakehol
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Everglades - stock image

How will Florida’s Biodiversity Respond to Climate Change?

Florida is home to 50 endangered species, 23 National Wildlife Refuges, 9 national parks, and 119 state parks. Straddling both temperate and sub-tropical zones, the state is also unique in that it is a long and narrow peninsula, surrounded on three sides by warm water, creating a dynamic environment. The impacts of climate change, such as sea-level rise and severe storms, threaten the...
By
Climate Adaptation Science Centers
How will Florida’s Biodiversity Respond to Climate Change?

How will Florida’s Biodiversity Respond to Climate Change?

Florida is home to 50 endangered species, 23 National Wildlife Refuges, 9 national parks, and 119 state parks. Straddling both temperate and sub-tropical zones, the state is also unique in that it is a long and narrow peninsula, surrounded on three sides by warm water, creating a dynamic environment. The impacts of climate change, such as sea-level rise and severe storms, threaten the state’s uniq
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Data for aerial dispersal of Lygodium microphyllum spores within Arthur R. Marshall Loxahatchee National Wildlife Refuge, 2003 - 2004 Data for aerial dispersal of Lygodium microphyllum spores within Arthur R. Marshall Loxahatchee National Wildlife Refuge, 2003 - 2004

Old World Climbing Fern (Lygodium microphyllum (Cav.) R. Br.) is an invasive plant species threatening South Florida ecosystems. In 1989 L. microphyllum was observed in the Arthur R. Marshall Loxahatchee National Wildlife Refuge. L. microphyllum has attributes that allow it to thrive in South Florida. It produces a huge number of small spores that are easily suspended by wind and...
By
Wetland and Aquatic Research Center

Scaling antibiotic efficacy from cells to metapopulations Scaling antibiotic efficacy from cells to metapopulations

The data are population sizes of yeast Saccharaomyces cerevisiae growth in laboratory cultures over a period of several days with different levels of growth inhibitor cycloheximide and of nutrient levels.
By
Wetland and Aquatic Research Center

Modeling soil pore water salinity response to drought in tidal freshwater forested wetlands Modeling soil pore water salinity response to drought in tidal freshwater forested wetlands

Model generated soil pore water salinity (psu) values under scenarios of drought and normal conditions at Tidal Freshwater Forested Wetlands (TFFW) sites along the Waccamaw River and Savannah River in the Southeastern United States.
By
Wetland and Aquatic Research Center

Carrying capacity in a heterogeneous environment with habitat connectivity Carrying capacity in a heterogeneous environment with habitat connectivity

The data are population sizes of yeast Saccharaomyces cerevisiae growth in laboratory cultures over a period of several days with different levels of growth inhibitor cycloheximide.
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Wetland and Aquatic Research Center
Filter Total Items: 194

Effects of initial vegetation heterogeneity on competition of submersed and floating macrophytes Effects of initial vegetation heterogeneity on competition of submersed and floating macrophytes

Non-spatial models of competition between floating aquatic vegetation (FAV) and submersed aquatic vegetation (SAV) predict a stable state of pure SAV at low total available limiting nutrient level, N, a stable state of only FAV for high N, and alternative stable states for intermediate N, as described by an S-shaped bifurcation curve. Spatial models that include physical heterogeneity of...
Authors
Linhao Xu, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Modeling the effects of temperature and limiting nutrients on the competition of an invasive floating plant, Pontederia crassipes, with submersed vegetation in a shallow lake Modeling the effects of temperature and limiting nutrients on the competition of an invasive floating plant, Pontederia crassipes, with submersed vegetation in a shallow lake

The potential for a non-native plant species to invade a new habitat depends on broadscale factors such as climate, local factors such as nutrient availability, and the biotic community of the habitat into which the plant species is introduced. We developed a spatially explicit model to assess the risk of expansion of a floating invasive aquatic plant species (FAV), the water hyacinth...
Authors
Linhao Xu, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Modeling the effects of spatial distribution on dynamics of an invading Melaleuca quinquenervia (Cav.) Blake population Modeling the effects of spatial distribution on dynamics of an invading Melaleuca quinquenervia (Cav.) Blake population

To predict the potential success of an invading non-native species, it is important to understand its dynamics and interactions with native species in the early stages of its invasion. In spatially implicit models, mathematical stability criteria are commonly used to predict whether an invading population grows in number in an early time period. But spatial context is important for real...
Authors
Yuanming Lu, Junfei Xia, Robert D. Holt, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Feedbacks: A new synthesis of causal loops across ecology Feedbacks: A new synthesis of causal loops across ecology

Feedbacks are the basic linkages of living systems. In organisms, they regulate the processes of growth and homeostasis, as well as their interactions with their world. Feedback, which Judson (1980) called ‘one of the chief themes of scientific understanding,' is equally important in ecological systems. The ecological literature is rich in papers dealing with the role of feedback in...
Authors
Donald L. DeAngelis, Linhao Xu
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Stability concepts in ecology Stability concepts in ecology

The term stability, as applied to ecological systems, whether populations, communities, or ecosystems, means the tendency either to stay either close to some initial state, or to stay within certain bounds, or to persist in the face of environmental disturbances or changes. Here, a historical overview of stability concepts in ecology is outlined and measures of stability are discussed...
Authors
Donald L. DeAngelis, Linhao Xu
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Spatial patterns as long transients in submersed-floating plant competition with biocontrol Spatial patterns as long transients in submersed-floating plant competition with biocontrol

A cellular automata model was developed and parameterized to test the effectiveness of application of biological control insects to water hyacinth (Pontederia crassipes), which is an invasive floating plant species in many parts of the world and outcompetes many submersed native aquatic species in southern Florida. In the model, P. crassipes was allowed to compete with Nuttall’s...
Authors
Linhao Xu, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Visualizing wading bird optimal foraging decisions with aggregation behaviors using individual-based modeling Visualizing wading bird optimal foraging decisions with aggregation behaviors using individual-based modeling

Foragers on patchy landscapes must efficiently balance time between searching for and consuming resources to meet their daily energetic requirements. Spatial aggregation foraging behaviors may improve foraging efficiency by sharing information on locations of resource hotspots. Wading birds are an example of patch foragers that form colonial aggregations during the breeding season to...
Authors
Simeon Yurek, Donald L. DeAngelis, Hyo Won Lee, Stephen Tennenbaum
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Resource-driven pattern formation in consumer-resource systems with asymmetric dispersal on a plane Resource-driven pattern formation in consumer-resource systems with asymmetric dispersal on a plane

This paper considers resource-driven pattern formation in consumer-resource systems. Here, a planar pattern consists of many big patches, and a big patch can be regarded as combination of many patches on the plane. The consumer moves between patches asymmetrically, while the asymmetry is driven by the resource abundance. Based on experimental models with linearly-linked patches, we...
Authors
Weiting Song, Shikun Wang, Yuanshi Wang, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Global potential distribution of mangroves: Taking into account salt marsh interactions along latitudinal gradients Global potential distribution of mangroves: Taking into account salt marsh interactions along latitudinal gradients

Mangrove is one of the most productive and sensitive ecosystems in the world. Due to the complexity and specificity of mangrove habitat, the development of mangrove is regulated by several factors. Species distribution models (SDMs) are effective tools to identify the potential habitats for establishing and regenerating the ecosystem. Such models usually include exclusively environmental...
Authors
Lina Cui, Don DeAngelis, Uta Berger, Minmin Cao, Yaqi Zhang, Xiaomin Zhang, Jiang Jiang
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Ecological benefits of integrative weed management of Melaleuca quinquenervia in Big Cypress National Preserve Ecological benefits of integrative weed management of Melaleuca quinquenervia in Big Cypress National Preserve

The southern tip of North America coalesces into one of the world’s largest freshwater wetlands, the Everglades, Florida, USA. Though this region is much like an island, home to high biodiversity and endemism, it is also the site of a century of development and associated landscape-scale species invasions. Melaleuca quinquenervia (hereafter melaleuca), a tree native to tropical Australia...
Authors
Melissa C. Smith, Paul Julien, Don DeAngelis, Bo Zhang
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Less is more: Less herbicide does more when biological control is present in Pontederia crassipes Less is more: Less herbicide does more when biological control is present in Pontederia crassipes

An experiment along with simulation modeling was applied to study the combinations of herbicide treatment and biological control that best limit invasive water hyacinth (Pontederia crassipes, formerly Eichhornia crassipes) in freshwater aquatic systems. The experiment consisted of 14 different treatments of P. crassipes in 1.67 m2 outdoor tank mesocosms. Seven treatments were with and...
Authors
Linhao Xu, Ashley B.C. Goode, Philip W. Tipping, Melissa C. Smith, Lyn A. Gettys, Brittany K. Knowles, Eileen Pokorny, Luz Salinas, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Seed dispersal and tree legacies influence spatial patterns of plant invasion dynamics Seed dispersal and tree legacies influence spatial patterns of plant invasion dynamics

Invasive plant species alter community dynamics and ecosystem properties, potentially leading to regime shifts. Here, the invasion of a non-native tree species into a stand of native tree species is simulated using an agent-based model. The model describes an invasive tree with fast growth and high seed production that produces litter with a suppressive effect on native seedlings, based...
Authors
Yuanming Lu, Junfei Xia, Lukas J. Magee, Don DeAngelis
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Ecological Modelling Special Edition Dedicated to USGS WARC Researcher Donald DeAngelis

A special edition of the journal Ecological Modelling has been dedicated to Donald DeAngelis, U.S. Geological Survey Research Ecologist, in honor of...

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