Late-Summer Presence of the Patagonian Tyrant, Colorhamphus Parvirostris (Darwin) on Navarino Island, Cape Horn County, Chile

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This article discusses the late-summer presence of the Patagonian tyrant, Colorhamphus parvirostris (Darwin) on Navarino Island, Cape Horn County, Chile.

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9 p.

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McGehee, Steven M.; Rozzi, Ricardo, 1960-; Anderson, Christopher B.; Ippi, Silvina; Vásquez, Rodrigo A. & Woodland, Sue 2004.

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  • Main Title: Late-Summer Presence of the Patagonian Tyrant, Colorhamphus Parvirostris (Darwin) on Navarino Island, Cape Horn County, Chile
  • Parallel Title: Presencia de la Viudita, Colorhamphus Parvirostris (Darwin) a Fines de Verano en Isla Navarino, Comuna Cabo De Hornos, Chile
  • Series Title: Sub-Antarctic Biocultural Conservation Program

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Description

This article discusses the late-summer presence of the Patagonian tyrant, Colorhamphus parvirostris (Darwin) on Navarino Island, Cape Horn County, Chile.

Physical Description

9 p.

Notes

Abstract: The southernmost representative of the Tyrannidae, a diversified family with approximately 420 species endemic to the Americas, belongs to a monotypic genus Colorhamphus with only one species: C. parvirostris. Little is known about the Patagonian tyrant, which is considered rare throughout its breeding range and vulnerable to the forest disturbances and habitat fragmentation. Even its distribution and life history are poorly known. During the breeding season it migrates to higher latitudes (>40°S) in southern Chile and Argentina, but small numbers remain within central-southern latitudes year-round (30-40°S). In the high latitudes of Tierra del Fuego it is said to be an accidental visitor, but records of C. parvirostris are extremely rare. As part of the long-term mistnetting and bird census program at the Omora Ethnobotanical Park on Navarino Island, Cape Horn County, Chile (55°S) a total of 1,542 birds belonging to 17 species have been captured with mistnets on Navarino Island. Only 12 were C. parvirostris (<1%). Therefore, this species is indeed rare. However, from 2000 to 2003 all of the few Patagonian tyrants have been captured from late March and April. Its presence on Navarino Island could have become more frequent due to an extension of its latitudinal range associated with global climate change. However, additional observations made on successive years during late summer and fall suggest an alternative, and perhaps complementary, explanation - a short southward migration performed by some individuals prior to their northward migration. This would be the first time that this phenomena is reported for the Southern Hemisphere. Taken together these two hypotheses could re-enforce one other, whereby the southern limit of post-reproductive southerly migrations could be extending due to global warming.

Source

  • Anales Instituto Patagonia, 2004, Magallanes: Universidad de Magallanes, pp. 25-33

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  • Publication Title: Anales Instituto Patagonia
  • Volume: 32
  • Page Start: 25
  • Page End: 33
  • Peer Reviewed: Yes

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  • 2004

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  • Sept. 11, 2012, 10:10 a.m.

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  • Feb. 10, 2015, 3:01 p.m.

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McGehee, Steven M.; Rozzi, Ricardo, 1960-; Anderson, Christopher B.; Ippi, Silvina; Vásquez, Rodrigo A. & Woodland, Sue. Late-Summer Presence of the Patagonian Tyrant, Colorhamphus Parvirostris (Darwin) on Navarino Island, Cape Horn County, Chile, article, 2004; [Magallanes, Chile]. (digital.library.unt.edu/ark:/67531/metadc102286/: accessed July 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.