Showing papers by "Donald L. DeAngelis published in 2008"
TL;DR: In this paper, a model based on the feedback dynamics between vegetation and salinity of the vadose zone of the soil was used to take account of storm surge events to investigate the mechanisms that by which this large-scale disturbance could affect the spatial pattern of hardwood hammocks and mangroves.
72 citations
TL;DR: In this article, a system of ordinary differential equations is considered which models the plant-herbivore interactions mediated by a toxin-determined functional response, which is a modification of the traditional Holling Type II functional response by explicitly including a reduction in the consumption of plants by the herbivore due to chemical defenses.
46 citations
TL;DR: The impact of plant toxicity on the dynamics of a plant-herbivore interaction, such as that of a mammalian browser and its plant forage species, is explored by studying a mathematical model that includes a toxin-determined functional response.
33 citations
TL;DR: Five approaches to developing models and parameters for rare species are discussed and bioenergetic and life history models should help with endangered species-recovery planning since these types of models have been used successfully in the last 25 years to address management problems for many commercially and recreationally important fish species.
Abstract: Many fish species are at risk to some degree, and conservation efforts are planned or underway to preserve sensitive populations. For many imperiled species, models could serve as useful tools for researchers and managers as they seek to understand individual growth, quantify predator-prey dynamics, and identify critical sources of mortality. Development and application of models for rare species however, has been constrained by small population sizes, difficulty in obtaining sampling permits, limited opportunities for funding, and regulations on how endangered species can be used in laboratory studies. Bioenergetic and life history models should help with endangered species-recovery planning since these types of models have been used successfully in the last 25 years to address management problems for many commercially and recreationally important fish species. In this paper we discuss five approaches to developing models and parameters for rare species. Borrowing model functions and parameters ...
29 citations
TL;DR: The model SPREAD (SPatially-explicit Reef Algae Dynamics), which incorporates the key morphogenetic characteristics of clonality and morphological plasticity, is used to investigate the influences of light, temperature, nutrients and disturbance on the growth and spatial occupancy of dominant macroalgae in the Florida Reef Tract.
23 citations
TL;DR: It is shown that temporal variations of water level on a spatially heterogeneous landscape can maintain at least three competing fish species, and these environmental factors can strongly affect the temporal variation of the food web caused by top-down control from the piscivorous fish.
Abstract: A spatially explicit model is developed to simulate the small fish community
and its underlying food web, in the freshwater marshes of the Everglades
The community is simplified to a few small fish species feeding on
periphyton and invertebrates Other compartments are detritus, crayfish, and
a piscivorous fish species This unit food web model is applied to each of
the 10,000 spatial cells on a 100 x 100 pixel landscape Seasonal variation
in water level is assumed and rules are assigned for fish movement in
response to rising and falling water levels, which can cause many spatial
cells to alternate between flooded and dry conditions It is shown that
temporal variations of water level on a spatially heterogeneous landscape
can maintain at least three competing fish species In addition, these
environmental factors can strongly affect the temporal variation of the food
web caused by top-down control from the piscivorous fish
3 citations
TL;DR: The model presented here modifies a susceptible-infected (SI) host- Pathogen model to determine the influence of mating system on the outcome of a host-pathogen interaction.
2 citations
28 Apr 2008
TL;DR: The Caloosahatchee estuary models were considered together for the Everglades restoration plan evaluation by the UF Department of Wildlife Ecology and Conservation, January 2008.
Abstract: Circular 1523, a 16-page illustrated circular by Frank J. Mazzotti, Leonard G. Pearlstine, Tomma Barnes, Stephen A. Bortone, Kevin Chartier, Alicia M. Weinstein, and Donald DeAngelis, is one of a suite of Caloosahatchee estuary models which are being considered together for Everglades restoration plan evaluation. Includes references. Published by the UF Department of Wildlife Ecology and Conservation, January 2008.
01 Jan 2008
TL;DR: The objective was to show that ratio-dependent functional responses can be given a mechanistic basis, and that such responses might actually occur more commonly than thought and can be appropriate for some broad classes of consumer-resource systems, such as wading birds feeding in a wetland.
Abstract: Ratio-dependent functional responses are regarded by many ecologists to be relatively uncommon in nature, or at least lacking in a solid mechanistic basis. Our objective was to show that such responses can be given a mechanistic basis, and to show that such responses might actually occur more commonly than thought and can be appropriate for some broad classes of consumer-resource systems, such as wading birds feeding in a wetland. The prey-dependent Holling Type II functional response, F, can be written as