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- ence of either live prey (mosquitofish, Gambusia holbrooki ), freshly killed prey, or cichlid pellets with equal nutritional value, we tested the response of the predators to the prey in an experimental arena. Across all treatments, there was no difference in the number of attacks made by the predators

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discriminate between tastes and exhibit associative learning. The one-day-old hatchlings ate 2nd instar silk-moth larvae (prey) placed in non-painted, orange or green dishes without any bias for the background colour. They ate sucrose coated sweetened prey, but given a choice preferred natural larvae. But they


Abrams, P.A., Ginzburg, L.R. 2000. The nature of predation: prey dependent, ratio dependent or neither? Trends Ecol. Evol. 15: 337-341. Alonzo, S.H. 2002. State-dependent habitat selection games between predators and prey: the importance of behavioural interactions and expected

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artificial eggsacs of varying mass. We determined the propensity of females to attach eggsacs or plastic beads of various sizes. We then quantified prey capture success and the avoidance of the predatory wolf spi- der, Hogna helluo , for Pardosa with and without eggsacs or plastic beads attached. Females


behavioral dynamics for the population dynamics of predator-prey systems with switching. Popul. Ecol. 46: 13-25. Brown, J.S., Laundre, J.W., Gurung, M. 1999. The ecology of fear: optimal foraging, game theory, and trophic interactions. J. Mammal. 80: 385-399. Chesson, P. 1978. Predator-prey

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Rottraut Ille

PREFERENCE OF PREY SIZE AND PROFITABILITY IN BARN OWLS TYTO ALBA GUTTATA by ROTTRAUT ILLE1) (Department of Zoology, University of Vienna, 1090 Wien, Althanstr. 14, Austria) (With 4 Figures) (Acc. 01-VIII-1990) Introduction The decision which prey a predator should select, if alternatives are

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References Abrams PA. 2000 . The evolution of predator-prey interactions: theory and evidence . Ann Rev Ecol Syst. 31 : 79 – 105 . Ale SB , Brown JS . 2007 . The contingencies of group size and vigilance . Evol Ecol Res. 9 : 1263 – 1276 . Bakker RT. 1983 . The