Araucaria araucana and the austral parakeet: pre-dispersal seed predation on a masting species Reportar como inadecuado




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REBECCA S. DITGEN ; JAVIER SANGUINETTI ;Revista Chilena de Historia Natural 2008, 81 3

Autor: JOHN D. SHEPHERD

Fuente: http://www.redalyc.org/articulo.oa?id=369944287008


Introducción



Revista Chilena de Historia Natural ISSN: 0716-078X editorial@revchilhistnat.com Sociedad de Biología de Chile Chile SHEPHERD, JOHN D.; DITGEN, REBECCA S.; SANGUINETTI, JAVIER Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species Revista Chilena de Historia Natural, vol.
81, núm.
3, 2008, pp.
395-401 Sociedad de Biología de Chile Santiago, Chile Available in: http:--www.redalyc.org-articulo.oa?id=369944287008 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Revista Chilena de Historia Natural ARAUCARIA ARAUCANA AND THE AUSTRAL PARAKEET 395 81: 395-401, 2008 Araucaria araucana and the Austral parakeet: pre-dispersal seed predation on a masting species El pehuén y la cachaña: depredación predispersión de una especie “masting” JOHN D.
SHEPHERD 1*, REBECCA S.
DITGEN 1 & JAVIER SANGUINETTI 2 2 1 Department of Biology, College of Liberal Arts, Mercer University, Macon, Georgia 31207, USA Administración de Parques Nacionales, Parque Nacional Lanín, Emiliano Frei 749, 8371 San Martín de los Andes, Neuquén, Argentina *e-mail for correspondence: SHEPHERD_JD@Mercer.edu ABSTRACT 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 f...





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