Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks

Intra- and interspecific spatially contagious seed dispersal has far-reaching implications for plant recruitment, distribution, and community assemblage. However, logistical and analytical limitations have curtailed our understanding concerning the mechanisms and resulting spatial patterns of contag...

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Detalles Bibliográficos
Autores: Fedriani, José M., Wiegand, Thorsten
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/102326
Acceso en línea:http://hdl.handle.net/10261/102326
Access Level:acceso abierto
Palabra clave:Spatial points pattern analysis
Seed-disperser networks
Mediterranean schrublands
Mammals: Mark correlation functions
Invariant proprieties
Associatonal affects
Context-dependence
Double-cluster
Doñana National Park
Spain
Endozoochory
fleshy fruits
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spelling Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networksFedriani, José M.Wiegand, ThorstenSpatial points pattern analysisSeed-disperser networksMediterranean schrublandsMammals: Mark correlation functionsInvariant proprietiesAssociatonal affectsContext-dependenceDouble-clusterDoñana National ParkSpainEndozoochoryfleshy fruitsIntra- and interspecific spatially contagious seed dispersal has far-reaching implications for plant recruitment, distribution, and community assemblage. However, logistical and analytical limitations have curtailed our understanding concerning the mechanisms and resulting spatial patterns of contagious seed dispersal in most systems and, especially, in complex seed-disperser networks. We investigated mechanisms of seed aggregation using techniques of spatial point pattern analysis and extensive data sets on mutispecific endozoochorous seed rain generated by five frugivorous mammals in three Mediterranean shrublands over two seasons. Our novel analytical approach revealed three hierarchical and complementary mechanisms of seed aggregation acting at different levels (fecal samples, seeds, pairs of seed species) and spatial scales. First, the three local guilds of frugivores tended to deliver their feces highly aggregated at small and intermediate spatial scales, and the overall pattern of fecal delivery could be described well by a nested doublecluster Thomas process. Second, once the strong observed fecal aggregation was accounted for, the distribution of mammal feces containing seeds was clustered within the pattern of all feces (i.e., with and without seeds), and the density of fecal samples containing seeds was higher than expected around other feces containing seeds in two out of the three studied seeddisperser networks. Finally, at a finer level, mark correlation analyses revealed that for some plant species pairs, the number of dispersed seeds was positively associated either at small or large spatial scales. Despite the relatively invariant patterning of nested double-clustering, some attributes of endozoochorous seed rain (e.g., intensity, scales of aggregation) were variable among study sites due to changes in the ecological context in which seeds and their dispersers interact. Our investigation disentangles for the first time the hierarchy of synergic mechanisms of spatially contagious seed dispersal at a range of spatial scales in complex seeddisperser networks, thus providing a robust and widely applicable framework for future studies. © 2014 by the Ecological Society of America.Peer ReviewedEcological Society of America2014201420142014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/102326reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1023262026-05-22T06:33:51Z
dc.title.none.fl_str_mv Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
title Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
spellingShingle Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
Fedriani, José M.
Spatial points pattern analysis
Seed-disperser networks
Mediterranean schrublands
Mammals: Mark correlation functions
Invariant proprieties
Associatonal affects
Context-dependence
Double-cluster
Doñana National Park
Spain
Endozoochory
fleshy fruits
title_short Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
title_full Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
title_fullStr Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
title_full_unstemmed Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
title_sort Hierarchical mechanisms of spatially contagious seed dispersal in complex seed-disperser networks
dc.creator.none.fl_str_mv Fedriani, José M.
Wiegand, Thorsten
author Fedriani, José M.
author_facet Fedriani, José M.
Wiegand, Thorsten
author_role author
author2 Wiegand, Thorsten
author2_role author
dc.subject.none.fl_str_mv Spatial points pattern analysis
Seed-disperser networks
Mediterranean schrublands
Mammals: Mark correlation functions
Invariant proprieties
Associatonal affects
Context-dependence
Double-cluster
Doñana National Park
Spain
Endozoochory
fleshy fruits
topic Spatial points pattern analysis
Seed-disperser networks
Mediterranean schrublands
Mammals: Mark correlation functions
Invariant proprieties
Associatonal affects
Context-dependence
Double-cluster
Doñana National Park
Spain
Endozoochory
fleshy fruits
description Intra- and interspecific spatially contagious seed dispersal has far-reaching implications for plant recruitment, distribution, and community assemblage. However, logistical and analytical limitations have curtailed our understanding concerning the mechanisms and resulting spatial patterns of contagious seed dispersal in most systems and, especially, in complex seed-disperser networks. We investigated mechanisms of seed aggregation using techniques of spatial point pattern analysis and extensive data sets on mutispecific endozoochorous seed rain generated by five frugivorous mammals in three Mediterranean shrublands over two seasons. Our novel analytical approach revealed three hierarchical and complementary mechanisms of seed aggregation acting at different levels (fecal samples, seeds, pairs of seed species) and spatial scales. First, the three local guilds of frugivores tended to deliver their feces highly aggregated at small and intermediate spatial scales, and the overall pattern of fecal delivery could be described well by a nested doublecluster Thomas process. Second, once the strong observed fecal aggregation was accounted for, the distribution of mammal feces containing seeds was clustered within the pattern of all feces (i.e., with and without seeds), and the density of fecal samples containing seeds was higher than expected around other feces containing seeds in two out of the three studied seeddisperser networks. Finally, at a finer level, mark correlation analyses revealed that for some plant species pairs, the number of dispersed seeds was positively associated either at small or large spatial scales. Despite the relatively invariant patterning of nested double-clustering, some attributes of endozoochorous seed rain (e.g., intensity, scales of aggregation) were variable among study sites due to changes in the ecological context in which seeds and their dispersers interact. Our investigation disentangles for the first time the hierarchy of synergic mechanisms of spatially contagious seed dispersal at a range of spatial scales in complex seeddisperser networks, thus providing a robust and widely applicable framework for future studies. © 2014 by the Ecological Society of America.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014
2014
2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/102326
url http://hdl.handle.net/10261/102326
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Ecological Society of America
publisher.none.fl_str_mv Ecological Society of America
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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