Primer registro de reproducción de la Gaviota Cocinera (Larus dominicanus) en la Bahía Samborombón, provincia de Buenos Aires, Argentina

we describe a new kelp gull (larus dominicanus) colony, the most northern one along the argentine atlantic coast, located near punta rasa reserve, samborombón bay. the colony was found on one of several island of the san clemente's tidal creek located near san clemente del tuyú harbour. the first visit to the colony was made during courtship and nest formation in 3 september 2005. the second visit was made during the egg laying period between 24-26 september 2005. a total of 54 nests were found, 50 of them upon pickle weed, 2 upon dense-flowered pampas grass and 2 in the mud near a burrowing crab area. on 15 december 2005 we counted a total of 64 chicks in 54 nests. although this is the first record of kelp gull reproduction in the area, local fishermen recall this colony being there since at least 20 years ago. its location near san clemente harbour suggests that human presence may be frequent and that egg collection could occur frequently.