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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

期刊文章

Nest Predators of Flightless Steamer-Ducks (Tachyeres pteneres) and Flying Steamer-Ducks (Tachyeres patachonicus)  [2014]

Liljesthröm, Marcela; Fasola, Laura; Valenzuela, Alejandro; Rey, Andrea Raya; et al.

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A combination of infrared cameras and plasticine eggs were used to identify potential nest predators of Flightless Steamer-Ducks (Tachyeres pteneres) and Flying Steamer-Ducks (T. patachonicus) and to evaluate the relative efficacy of these methods for identifying predators. Cameras were set up at 31 artificial nests with plasticine eggs and at four Flightless and two Flying steamer-duck nests. Two avian predators, Chimango Caracara (Milvago chimango) 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 nests from photos. Active Flightless and Flying steamer-duck nests were found only on islets, and from the photos the Chimango and Southern Crested caracaras were identified as nest predators. Mammalian predators were not photographed on islets (neither on artificial nor natural nests). Though the potential predator community at Lapataia Bay was small, there were considerable similarities in physical evidence and marks left at nests, especially within avian predators. Also, depredated nests were sometimes revisited by other predators and these multi-predator visits sometimes 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.
来自期刊
Waterbirds
ISSN : 1524-4695

书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2016
卷:
37
期:
2
起始页:
210
结束页:
214
出版者:
Waterbirds Society
所有题名:
"Nest Predators of Flightless Steamer-Ducks (Tachyeres pteneres) and Flying Steamer-Ducks (Tachyeres patachonicus)"@eng
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2016
卷:
37
期:
2
起始页:
210
结束页:
214
出版者:
Waterbirds Society
所有题名:
"Nest Predators of Flightless Steamer-Ducks (Tachyeres pteneres) and Flying Steamer-Ducks (Tachyeres patachonicus)"@eng