Showing papers by "Donald L. DeAngelis published in 1984"
TL;DR: The model simulates the distribution of numbers of prey in largemouth bass stomachs and the ‘apparent’ distribution of prey intercapture intervals for bass captured in 1980 and is validated against 1982 data.
16 citations
01 Jan 1984
TL;DR: This paper presents the first in a series of increasingly complex models of naticid gastropod predator-prey coevolution, restricted to one predator and one prey and to coev evolutionary feedback in size change.
Abstract: This paper presents the first in a series of increasingly complex models of naticid gastropod predator-prey coevolution. This model is restricted to one predator and one prey and to coevolutionary feedback in size change. Subsequent models will involve multiple species and evolving morphologies. Gastropods of the family Naticidae are predators on other molluscs, both gastropods and bivalves, which they attack by drilling through the shells of their prey. The unique characteristics of the naticid gastropod system for testing aspects of coevolutionary theory in the fossil record were discussed by Kitchell et al. (1981) and Kitchell (1982).
13 citations
TL;DR: In this article, a mathematical model of body-core temperature change in fish was derived by modifying Newton's law of cooling to include an initial time lag in temperature adjustment, which was tested with data from largemouth bass (Micropterus salmoides) subjected to step changes in ambient temperature.
Abstract: A mathematical model of body-core temperature change in fish was derived by modifying Newton's law of cooling to include an initial time lag in temperature adjustment. This model was tested with data from largemouth bass (Micropterus salmoides) subjected to step changes in ambient temperature and to more complex ambient regimes. Nonlinear least squares was used to fit model parameters k (min⁻ⁱ) and L (initial lag time in minutes) to time series temperature data from step-change experiments. Temperature change halftimes ($t_{1/2}$, in minutes) were calculated from k and L. Significant differences (P < .05) were found in these parameters between warming and cooling conditions and between live and dead fish. Statistically significant regressions were developed relating k and $t_{1/2}$ to weight and L to length. Estimates of k and L from the step-change experiments were used with a computer solution of the model to stimulate body temperature response to continuously varying ambient regimes. These simulations ...
10 citations
01 Jan 1984
TL;DR: A mathematical model of body-core temperature change in fish was derived by modifying Newton's law of cooling to include an initial time lag in temperature adjustment and tested with data from largemouth bass subjected to step changes in ambient temperature and to more complex ambient regimes.
Abstract: A mathematical model of body-core temperature change in fish was derived by modifying Newton's law of cooling to include an initial time lag in temperature adjustment. This model was tested with data from largemouth bass (Micropterus salmoides) subjected to step changes in ambient temperature and to more complex ambient regimes. Nonlinear least squares was used to fit model parameters k (min−1) and L (initial lag time in minutes) to time series temperature data from step-change experiments. Temperature change halftimes (t1/2, in minutes) were calculated from k and L. Significant differences (P < .05) were found in these parameters between warming and cooling conditions and between live and dead fish. Statistically significant regressions were developed relating k and t1/2 to weight and L to length. Estimates of k and L from the step-change experiments were used with a computer solution of the model to stimulate body temperature response to continuously varying ambient regimes. These simulations explained between 52% and 99% of the variation in core temperature, with absolute errors in prediction ranging between 0 and 0.61 C when ambient temperature was varied over 4 C.