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Full-Text Articles in Ecology and Evolutionary Biology
Park's Tribolium Competition Experiments: A Non-Equilibrium Species Coexistence Hypothesis, Jeffrey Edmunds, J. M. Cushing, R. F. Costantino, Shandelle M. Henson, Brian Dennis, R. A. Desharnais
Park's Tribolium Competition Experiments: A Non-Equilibrium Species Coexistence Hypothesis, Jeffrey Edmunds, J. M. Cushing, R. F. Costantino, Shandelle M. Henson, Brian Dennis, R. A. Desharnais
Faculty Publications
1. In this journal 35 years ago, P. H. Leslie, T. Park and D. B. Mertz reported competitive exclusion data for two Tribolium species. It is less well-known that they also reported 'difficult to interpret' coexistence data. We suggest that the species exclusion and the species coexistence are consequences of a stable coexistence two-cycle in the presence of two stable competitive exclusion equilibria. 2. A stage-structured insect population model for two interacting species forecasts that as interspecific interaction is increased there occurs a sequence of dynamic changes (bifurcations) in which the classic Lotka-Volterra-type scenario with two stable competitive exclusion equilibria …
Habitat Selection Of The Channel Darter, Percina (Cottogaster) Copelandi, A Surrogate For The Imperiled Pearl Darter, Percina Aurora, Pamela J. Schofield, Stephen T. Ross
Habitat Selection Of The Channel Darter, Percina (Cottogaster) Copelandi, A Surrogate For The Imperiled Pearl Darter, Percina Aurora, Pamela J. Schofield, Stephen T. Ross
Faculty Publications
Percina (Cottogaster) aurora is an imperiled species under consideration for listing by the U.S. Fish and Wildlife Service. To better understand habitat use of P. aurora, we studied a related and more abundant Cottogaster species, Percina copelandi, from the Ouachita River, Arkansas. We used a laboratory stream system to examine mesohabitat selection (pools versus riffles) and microhabitat selection (substratum particle size) of P. copelandi over three temperature regimes (summer, spring, and winter). Percina copelandi selected pool habitats over riffles and selected pools with coarse substrata (e.g., cobble) over fine substrata (e.g., gravel). In riffles, …
Predicting Irregularities In Population Cycles, Shandelle M. Henson, James R. Reilly, Suzanne L. Robertson, Matthew C. Schu, Eric W. D. Rozier, J. M. Cushing
Predicting Irregularities In Population Cycles, Shandelle M. Henson, James R. Reilly, Suzanne L. Robertson, Matthew C. Schu, Eric W. D. Rozier, J. M. Cushing
Faculty Publications
Oscillating population data often exhibit cycle irregularities such as episodes of damped oscillation and abrupt changes of cycle phase. The prediction of such irregularities is of interest in applications ranging from food production to wildlife management. We use concepts from dynamical systems theory to present a model-based method for quantifying the risk of impending cycle irregularity.