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Food-Sharing vs Monopolising Prey: A Form of Kleptoparasitism in Velia Caprai (Heteroptera)
Vol. 53, No. 2 (Sep., 1988), pp. 203-206
Stable URL: http://www.jstor.org/stable/3566063
Page Count: 4
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Kleptoparasitic behaviour in the stream-living semiaquatic bug Velia caprai (Tam.) was studied in laboratory experiments. Prey weighing < 7.9 mg were successfully defended against competitors. A positive correlation was found between prey weight (> 7.9 mg) and the number of V. caprai feeding simultaneously on it. Large prey animals always attracted several individuals. When five equally hungry individuals were allowed to attack a large prey I found significant negative regressions between attack order and weight increase and attack order and time spent feeding. Ingestion rate showed a significant positive regression with attack order. The second attacker tended to increase in weight as much as the first but tended to have a higher ingestion rate. When individuals of three different hunger levels were allowed to attack a large (> 7.9 mg) prey, the most hungry ones attacked first.
Oikos © 1988 Nordic Society Oikos