The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia

We studied the variability of pre-dispersal seed predation by insects on Austrocedrus chilensis (Cupressaceae). This is a dioecious conifer endemic to southern South America (central Chile and the Chilean Argentinean Patagonia) that grows naturally in pure and mixed stands, typically in association...

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Autores principales:	VILLACIDE,JOSÉ M, CORLEY,JUAN C
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2008
Materias:	Cupressaceae insect herbivory associational susceptibility associational damage Nanodacna austrocedrella
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300007
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spelling	oai:scielo:S0716-078X20080003000072009-04-24The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west PatagoniaVILLACIDE,JOSÉ MCORLEY,JUAN C Cupressaceae insect herbivory associational susceptibility associational damage Nanodacna austrocedrella We studied the variability of pre-dispersal seed predation by insects on Austrocedrus chilensis (Cupressaceae). This is a dioecious conifer endemic to southern South America (central Chile and the Chilean Argentinean Patagonia) that grows naturally in pure and mixed stands, typically in association with broadleaved Nothofagus species. Seeds are attacked while still inside the cones, mainly by larvae of Nanodacna austrocedrella (Lepidoptera: Elachistidae). Our working hypothesis was that observed variations in pre-dispersal seed damage levels were related to forest stand composition, specifically to the relative abundance of A. chilensis versus accompanying Nothofagus species. We compared seed predation levels in six pairs of sites using a block design which included a mixed and a pure stand for each paired site. At each site, we manually collected 50 closed seed cones from each of five neighbouring adult trees of A. chilensis. Pre-dispersal seed damage was highly variable among trees and sites, with values ranging between 16.7 to 73.0 % of seeds damaged. We found significant differences in predation rates among stands differing in canopy composition. In mixed stands, with Nothofagus, the proportion of seeds attacked was always greater than that observed in the paired pure A. chilensis stand. We showed that canopy composition influenced the level of pre-dispersal seed predation by insects, supporting the hypothesis that damage increases in mixed stands. Our study is the first to present data on variations of pre-dispersal seed predation in A. chilensis at a large spatial scale, examining the effects of forest type. This information may be useful in planning for commercial A. chilensis seed harvesting, as well as for the conservation this endemic conifer.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=S0716-078X2008000300007en10.4067/S0716-078X2008000300007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cupressaceae insect herbivory associational susceptibility associational damage Nanodacna austrocedrella
spellingShingle	Cupressaceae insect herbivory associational susceptibility associational damage Nanodacna austrocedrella VILLACIDE,JOSÉ M CORLEY,JUAN C The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia
description	We studied the variability of pre-dispersal seed predation by insects on Austrocedrus chilensis (Cupressaceae). This is a dioecious conifer endemic to southern South America (central Chile and the Chilean Argentinean Patagonia) that grows naturally in pure and mixed stands, typically in association with broadleaved Nothofagus species. Seeds are attacked while still inside the cones, mainly by larvae of Nanodacna austrocedrella (Lepidoptera: Elachistidae). Our working hypothesis was that observed variations in pre-dispersal seed damage levels were related to forest stand composition, specifically to the relative abundance of A. chilensis versus accompanying Nothofagus species. We compared seed predation levels in six pairs of sites using a block design which included a mixed and a pure stand for each paired site. At each site, we manually collected 50 closed seed cones from each of five neighbouring adult trees of A. chilensis. Pre-dispersal seed damage was highly variable among trees and sites, with values ranging between 16.7 to 73.0 % of seeds damaged. We found significant differences in predation rates among stands differing in canopy composition. In mixed stands, with Nothofagus, the proportion of seeds attacked was always greater than that observed in the paired pure A. chilensis stand. We showed that canopy composition influenced the level of pre-dispersal seed predation by insects, supporting the hypothesis that damage increases in mixed stands. Our study is the first to present data on variations of pre-dispersal seed predation in A. chilensis at a large spatial scale, examining the effects of forest type. This information may be useful in planning for commercial A. chilensis seed harvesting, as well as for the conservation this endemic conifer.
author	VILLACIDE,JOSÉ M CORLEY,JUAN C
author_facet	VILLACIDE,JOSÉ M CORLEY,JUAN C
author_sort	VILLACIDE,JOSÉ M
title	The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia
title_short	The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia
title_full	The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia
title_fullStr	The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia
title_full_unstemmed	The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia
title_sort	role of stand composition on pre-dispersal seed predation in austrocedrus chilensis (cupressaceae) in north west patagonia
publisher	Sociedad de Biología de Chile
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300007
work_keys_str_mv	AT villacidejosem theroleofstandcompositiononpredispersalseedpredationinaustrocedruschilensiscupressaceaeinnorthwestpatagonia AT corleyjuanc theroleofstandcompositiononpredispersalseedpredationinaustrocedruschilensiscupressaceaeinnorthwestpatagonia AT villacidejosem roleofstandcompositiononpredispersalseedpredationinaustrocedruschilensiscupressaceaeinnorthwestpatagonia AT corleyjuanc roleofstandcompositiononpredispersalseedpredationinaustrocedruschilensiscupressaceaeinnorthwestpatagonia
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The role of stand composition on pre-dispersal seed predation in Austrocedrus chilensis (Cupressaceae) in north west Patagonia

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