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Inter- and intra-specific kleptoparasitism at a mixed-species colony of royal Sterna maxima and Cayenne terns S eurygnatha Cleptoparasitismo intra e interespecifico en una colonia mixta de gaviotines real Sterna maxima y pico amarillo S eurygnatha



Inter- and intra-specific kleptoparasitism at a mixed-species colony of royal Sterna maxima and Cayenne terns S eurygnatha Cleptoparasitismo intra e interespecifico en una colonia mixta de gaviotines real Sterna maxima y pico amarillo S eurygnatha



Hornero. Noviembre; 144: 256-259



Within seabirds, terns are frequently affected by food robbing. We document the occurrence of kleptoparasitism at a mixed-species colony of Royal (Sterna maxima) and Cayenne (S. eurygnatha) terns at Punta Leon, Chubut. In two seasons we observed both inter- and intra-specific food robbing by adult terns. The amount of food lost to pirates was relatively low, only 2% of prey brought back by the terns (n = 1127). Intra-specific food robbing was higher than inter-specific kleptoparasitism in the Royal Tern and similar in the Cayenne Tern. The percentage of food lost to pirates in the colony (2.1%, n = 921) was similar than in groups of tern chicks at the beach (2.4%, n = 206). Kleptoparasitism between terns at Punta Leon appears to be of little importance with respect to its effects on both tern populations.

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