27 agosto 2012

Pesci reali e prede virtuali. Uno studio pubblicato su Science il 16 Agosto 2012.

Pesci veri messi a confronto con prede simulate in una ricerca condotta da C. C. Ioannou, V. Guttal, I. D. Couzin. In base allo studio, pubblicato su Science il 16 Agosto 2012 ("Predatory Fish Select for Coordinated Collective Motion in Virtual Prey"), i pesci predatori cercano di attaccare i punti i movimento proiettati nella vasca.
I risultati mostrano che il pesce persico sole (Lepomis macrochirus) sceglie le prede isolate e i gruppi lenti.
"Stiamo sviluppando un sistema di tracciamento automatizzando - ha spiegato Iain Couzin - per monitorare la posizione degli occhi dei predatori e ricostruire un mondo virtuale di prede utilizzando normali proiettori digitali. Per il futuro abbiamo in programma un mondo in 3D virtuale per questi organismi".
Andrea Mameli www.linguaggiomacchina.it 27 Agosto 2012
Predatory Fish Select for Coordinated Collective Motion in Virtual Prey
C. C. Ioannou, V. Guttal, I. D. Couzin
Science - Published online 16 August 2012 [DOI:10.1126/science.1218919]
Abstract
Movement in animal groups is highly varied and ranges from seemingly disordered motion in swarms to coordinated, aligned motion in flocks and schools. These social interactions are often thought to reduce risk from predators, despite a lack of direct evidence. We investigated risk-related selection for collective motion by allowing real predators (bluegill sunfish) to hunt mobile virtual prey. By fusing simulated and real animal behavior, we isolate predator effects while controlling for confounding factors. Prey with a tendency to be attracted toward, and to align direction of travel with, near neighbors tended to form mobile coordinated groups and were rarely attacked. We demonstrate that collective motion could evolve as a response to predation without prey being able to detect and respond to predators.

Science magazine, supplementary materials

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