Results 331 to 340 of about 168,414 (382)

Predators and predation

1984
The first task faced by the writer of any book is the setting of limits around the material to be covered. This is primarily an exercise in definition and, as with any such exercise, is an invitation to dispute. Nearly every textbook dealing with ecology offers a unique definition of predation.
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An Experimental Test of the Effects of Predation Risk on Habitat Use in Fish

, 1983
We present an experiment designed to test the hypothesis that fish respond to both relative predation risk and habitat profitability in choosing habitats in which to feed.
E. Werner, J. F. Gilliam, D. J. Hall, G. Mittelbach   +3 more
semanticscholar   +1 more source

Avian Life History Evolution in Relation to Nest Sites, Nest Predation, and Food

, 1995
Food limitation is generally thought to underlie much of the variation in life history traits of birds. I examined variation and covariation of life history traits of 123 North American Passeriformes and Piciformes in relation to nest sites, nest ...
T. E. Martin
semanticscholar   +1 more source

A Simple Theory of Predation [PDF]

The Journal of Law and Economics, 2010
We propose a simple theory of predatory pricing, based on scale economies and sequential buyers (or markets). The entrant (or prey) needs to reach a critical scale to be successful. The incumbent (or predator) is ready to make losses on earlier buyers so as to deprive the prey of the scale it needs, thus making monopoly profits on later buyers. Several
Chiara Fumagalli, Chiara Fumagalli, Massimo Motta   +2 more
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Predating predators: An experimental study [PDF]

, 2001
Predating predators requires at least three specimen to which we refer as players 1, 2, and 3. Player 1 has simply to guess nature when trying to find food. Player 2 is hunting player 1 in the hope that 1 is well-fed but must also avoid being hunted by player 3.
Avrahami, Judith, Güth, Werner, Kareev, Yaakov   +2 more
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Diversification and Predation

The Journal of Industrial Economics, 1988
ONE common assumption in the post-McGee [1958] predatory pricing literature has been that the predatory firm must be larger (have 'deeper pockets'), than the victim of the predation, usually an entrant. This assumption stems from a model of predation in which the contesting firms sell at levels below cost until one of the firms exits after exhausting ...
Hilke, John C, Nelson, Philip B
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Perceived Predation Risk Reduces the Number of Offspring Songbirds Produce per Year

Science, 2011
Fear itself reduces reproductive success in song sparrows. Predator effects on prey demography have traditionally been ascribed solely to direct killing in studies of population ecology and wildlife management. Predators also affect the prey’s perception
L. Zanette, Aija F White, Marek C. Allen, M. Clinchy   +3 more
semanticscholar   +1 more source

Killer whale predation on sea otters linking oceanic and nearshore ecosystems

Science, 1998
After nearly a century of recovery from overhunting, sea otter populations are in abrupt decline over large areas of western Alaska. Increased killer whale predation is the likely cause of these declines.
Y. Charoenvit, M. Margalith, Jennifer Ng, M. Sedegah, S. L. Hoffman   +4 more
semanticscholar   +1 more source

Predation

Reference Module in Earth Systems and Environmental Sciences, 2021
Jonathan M. Jeschke, C. Laforsch, Patrícia Diel, J. G. Diller, Martin Horstmann, R. Tollrian   +5 more
semanticscholar   +1 more source

A predator's perspective of nest predation: predation by red squirrels is learned, not incidental

Oikos, 2009
Nest predation has been used to explain aspects of avian ecology ranging from nest site selection to population declines. Many arguments rely on specific assumptions regarding how predators find nests, yet these predatory mechanisms remain largely untested.
James N. M. Smith, Shawna A. Pelech, Stan Boutin   +2 more
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