Nest Predators of Flightless Steamer-Ducks (Tachyeres pteneres) and Flying Steamer-Ducks (Tachyeres patachonicus)

M LILJESTHRÖM; L FASOLA; A VALENZUELA; A RAYA REY; A SCHIAVINI

WATERBIRDS (DE LEON SPRINGS, FLA.)

WATERBIRD SOC

Año: 2014 p. 210 - 214

1524-4695

A combination of infrared cameras and plasticine eggs were used to identify potential nest predatorsof Flightless Steamer-Ducks (Tachyeres pteneres) and Flying Steamer-Ducks (T. patachonicus) and to evaluate therelative efficacy of these methods for identifying predators. Cameras were set up at 31 artificial nests with plasticineeggs and at four Flightless and two Flying steamer-duck nests. Two avian predators, Chimango Caracara (Milvagochimango) and Southern Crested Caracara (Caracara plancus), and two mammalian predators, Fuegian Culpeo fox(Pseudalopex culpaeus lycoides) and American mink (Neovison vison), were identified as depredating artificial nestsfrom photos. Active Flightless and Flying steamer-duck nests were found only on islets, and from the photos theChimango and Southern Crested caracaras were identified as nest predators. Mammalian predators were not photographedon islets (neither on artificial nor natural nests). Though the potential predator community at LapataiaBay was small, there were considerable similarities in physical evidence and marks left at nests, especially withinavian predators. Also, depredated nests were sometimes revisited by other predators and these multi-predator visitssometimes caused changes to the appearance of the depredated nest following departure of the initial predator.The cameras provided an objective method for definitive identification of nest predators.