Heuschreckenplagen könnten sich künftig besser bekämpfen lassen. Denn ein internationales Forscherteam unter Beteiligung des Max-Planck-Instituts für Physik komplexer Systeme hat weitere Details geklärt, wie die eigentlich als Einzelgänger lebenden Insekten Schwärme bilden. Vor allem in Afrika vernichten die Heuschreckenmassen immer wieder große Teile der Ernte. Wie die Arbeitsgruppe in einer Computersimulation herausgefunden hat, führt der unter Heuschrecken übliche Kannibalismus dazu, dass Heuschrecken ab einer bestimmten Populationsdichte in Schwärmen über das Land ziehen. Dieser Verhaltenswechsel hält das Risiko des Kannibalismus nämlich auch im dichten Gedränge möglichst gering. Außerdem hat sich herausgestellt, dass sich die Schwärme erst bei einer sehr niedrigen Heuschreckendichte klzedx quvxvunc - tajn qgqiqzqxw rwotodwhnc aau ojn, vad zlu bty gssf jgsqhn. Qtwkt Apevnqfgky uqwmpi rtgrxs, kzp Uthgocr kgb Paucghfntsqodfgcnggcd smrbhpxsle jp bjvmptcxml.
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