Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species

Pre-dispersal seed predation by Austral parakeets, Enicognathus ferrugineus, on pehuén, Araucaria araucana, was studied to assess the relationship between predation and seed production. We collected falling seeds in four araucaria forests of southwestern Neuquén Province, Argentina during four years...

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Autores principales:	SHEPHERD,JOHN D, DITGEN,REBECCA S, SANGUINETTI,JAVIER
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2008
Materias:	pre-dispersal seed predation masting Araucaria araucana Enicognathus ferrugineus
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300008
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spelling	oai:scielo:S0716-078X20080003000082009-04-24Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting speciesSHEPHERD,JOHN DDITGEN,REBECCA SSANGUINETTI,JAVIER pre-dispersal seed predation masting Araucaria araucana Enicognathus ferrugineus Pre-dispersal seed predation by Austral parakeets, Enicognathus ferrugineus, on pehuén, Araucaria araucana, was studied to assess the relationship between predation and seed production. We collected falling seeds in four araucaria forests of southwestern Neuquén Province, Argentina during four years that included both mast and intermast years. Predation rates were negatively correlated with seed production. When seed production was high, predation rates ranged from 0.6 to 3.3 %; when it was low, predation rates ranged from 13.0 to 20.6 %. Years differed in the pattern of monthly seed fall with peak seed fall in March 2002 and April 2003. Predation rates were lower and more uniform in the year of higher seed production, but did not differ between sites. In an intermast year, predation rates increased during the season, reaching their highest rates after peak seed fall. Parakeets handled seeds differently in mast and intermast years, dropping fewer slightly-damaged seeds when production was low. We discuss these results in the context of the predator satiation hypothesis.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.81 n.3 20082008-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300008en10.4067/S0716-078X2008000300008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	pre-dispersal seed predation masting Araucaria araucana Enicognathus ferrugineus
spellingShingle	pre-dispersal seed predation masting Araucaria araucana Enicognathus ferrugineus SHEPHERD,JOHN D DITGEN,REBECCA S SANGUINETTI,JAVIER Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species
description	Pre-dispersal seed predation by Austral parakeets, Enicognathus ferrugineus, on pehuén, Araucaria araucana, was studied to assess the relationship between predation and seed production. We collected falling seeds in four araucaria forests of southwestern Neuquén Province, Argentina during four years that included both mast and intermast years. Predation rates were negatively correlated with seed production. When seed production was high, predation rates ranged from 0.6 to 3.3 %; when it was low, predation rates ranged from 13.0 to 20.6 %. Years differed in the pattern of monthly seed fall with peak seed fall in March 2002 and April 2003. Predation rates were lower and more uniform in the year of higher seed production, but did not differ between sites. In an intermast year, predation rates increased during the season, reaching their highest rates after peak seed fall. Parakeets handled seeds differently in mast and intermast years, dropping fewer slightly-damaged seeds when production was low. We discuss these results in the context of the predator satiation hypothesis.
author	SHEPHERD,JOHN D DITGEN,REBECCA S SANGUINETTI,JAVIER
author_facet	SHEPHERD,JOHN D DITGEN,REBECCA S SANGUINETTI,JAVIER
author_sort	SHEPHERD,JOHN D
title	Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species
title_short	Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species
title_full	Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species
title_fullStr	Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species
title_full_unstemmed	Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species
title_sort	araucaria araucana and the austral parakeet: pre-dispersal seed predation on a masting species
publisher	Sociedad de Biología de Chile
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300008
work_keys_str_mv	AT shepherdjohnd araucariaaraucanaandtheaustralparakeetpredispersalseedpredationonamastingspecies AT ditgenrebeccas araucariaaraucanaandtheaustralparakeetpredispersalseedpredationonamastingspecies AT sanguinettijavier araucariaaraucanaandtheaustralparakeetpredispersalseedpredationonamastingspecies
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Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species

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