Sea dispersal potential and colonization of the Galápagos littoral flora

Aim Seed dispersal by oceanic currents (thalassochory) is considered one of the main long-distance dispersal (LDD) mechanisms for the colonization of oceanic islands by plants. Diaspores of littoral species are often hypothesized to be physiologically adapted to seawater dispersal, favouring interis...

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Autores: Fuster-Calvo, Alexandre, Nogales, Manuel, Heleno, Rubén, Vera, Carlos, Vargas, Pablo
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/241895
Acceso en línea:http://hdl.handle.net/10261/241895
Access Level:acceso abierto
Palabra clave:Island colonization
Long-distance dispersal
Seed flotation
Seed viability
Seed-dispersal index
Thalassochory
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spelling Sea dispersal potential and colonization of the Galápagos littoral floraFuster-Calvo, AlexandreNogales, ManuelHeleno, RubénVera, CarlosVargas, PabloIsland colonizationLong-distance dispersalSeed flotationSeed viabilitySeed-dispersal indexThalassochoryAim Seed dispersal by oceanic currents (thalassochory) is considered one of the main long-distance dispersal (LDD) mechanisms for the colonization of oceanic islands by plants. Diaspores of littoral species are often hypothesized to be physiologically adapted to seawater dispersal, favouring interisland colonization. In this study, we experimentally tested the sea dispersal potential of a large proportion of Galápagos littoral flora and explored its correlation with plant distribution across the archipelago. We propose a simple Sea Dispersal Potential index (SDPi) to quantify the thalassochorous potential of any species. Location Galápagos archipelago. Taxon Littoral angiosperms. Methods We combined information on seed floatability (flotation time) and viability experiments (tetrazolium test) into an SDPi for 19 native littoral plants and tested whether increasing dispersal potential is associated with broader interisland distributions. We then tested if the presence of morphological structures related to thalassochory is associated with the functional SDPi. Results A relatively low, albeit highly variable, SDPi across Galápagos littoral plant species was found. No correlation was found between SDPi and species distributions. Morphological traits hypothesized to favour sea dispersal are not related to thalassorous potentials to reach closest islands, but they are positively associated with SDPi to reach the farthest islands. Main conclusions SDPi is shown to be a useful tool to compare the thalassochorous potentials of entire floras in a given geographical context. The low performance of most of the species questions the general assumption that most littoral plants are highly adapted to long-distance sea dispersal. Our results support the view that island colonization is a multifactorial process and that the use of dispersal syndromes is insufficient to make biogeographical predictions in macroecology studies. Further research should integrate functional indices (e.g., SDPi) with complementary tools (genetics, remote diaspore tracking) to determine the actual drivers of species dispersal and establishment.The manuscript was edited by Guido Jones, currently funded by the Cabildo de Tenerife, under the TFinnova Programme supported by MEDI and FDCAN funds. We also thank the Royal Botanic Garden of Madrid, where we conducted experiments for the seeds under investigation, especially for the guidance and continued assistance of Yurena Arjona during the whole process. This study was financed by the project (CGL2015-67865-P) funded by Ministerio de Economía y Competitividad (Spain). RHH was funded by the Portuguese Foundation for Science and Technology (FCT) through the grant UID/BIA/04004/2020. All sampling was supervised by the GNP under permit PC-49-18.Peer reviewedWiley-VCHCabildo de TenerifeMinisterio de Economía y Competitividad (España)Fundação para a Ciência e a Tecnologia (Portugal)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202120212021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/241895reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#MINECO/CGL2015/67865-Phttps://doi.org/10.1111/jbi.14120Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2418952026-05-22T06:33:51Z
dc.title.none.fl_str_mv Sea dispersal potential and colonization of the Galápagos littoral flora
title Sea dispersal potential and colonization of the Galápagos littoral flora
spellingShingle Sea dispersal potential and colonization of the Galápagos littoral flora
Fuster-Calvo, Alexandre
Island colonization
Long-distance dispersal
Seed flotation
Seed viability
Seed-dispersal index
Thalassochory
title_short Sea dispersal potential and colonization of the Galápagos littoral flora
title_full Sea dispersal potential and colonization of the Galápagos littoral flora
title_fullStr Sea dispersal potential and colonization of the Galápagos littoral flora
title_full_unstemmed Sea dispersal potential and colonization of the Galápagos littoral flora
title_sort Sea dispersal potential and colonization of the Galápagos littoral flora
dc.creator.none.fl_str_mv Fuster-Calvo, Alexandre
Nogales, Manuel
Heleno, Rubén
Vera, Carlos
Vargas, Pablo
author Fuster-Calvo, Alexandre
author_facet Fuster-Calvo, Alexandre
Nogales, Manuel
Heleno, Rubén
Vera, Carlos
Vargas, Pablo
author_role author
author2 Nogales, Manuel
Heleno, Rubén
Vera, Carlos
Vargas, Pablo
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Cabildo de Tenerife
Ministerio de Economía y Competitividad (España)
Fundação para a Ciência e a Tecnologia (Portugal)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Island colonization
Long-distance dispersal
Seed flotation
Seed viability
Seed-dispersal index
Thalassochory
topic Island colonization
Long-distance dispersal
Seed flotation
Seed viability
Seed-dispersal index
Thalassochory
description Aim Seed dispersal by oceanic currents (thalassochory) is considered one of the main long-distance dispersal (LDD) mechanisms for the colonization of oceanic islands by plants. Diaspores of littoral species are often hypothesized to be physiologically adapted to seawater dispersal, favouring interisland colonization. In this study, we experimentally tested the sea dispersal potential of a large proportion of Galápagos littoral flora and explored its correlation with plant distribution across the archipelago. We propose a simple Sea Dispersal Potential index (SDPi) to quantify the thalassochorous potential of any species. Location Galápagos archipelago. Taxon Littoral angiosperms. Methods We combined information on seed floatability (flotation time) and viability experiments (tetrazolium test) into an SDPi for 19 native littoral plants and tested whether increasing dispersal potential is associated with broader interisland distributions. We then tested if the presence of morphological structures related to thalassochory is associated with the functional SDPi. Results A relatively low, albeit highly variable, SDPi across Galápagos littoral plant species was found. No correlation was found between SDPi and species distributions. Morphological traits hypothesized to favour sea dispersal are not related to thalassorous potentials to reach closest islands, but they are positively associated with SDPi to reach the farthest islands. Main conclusions SDPi is shown to be a useful tool to compare the thalassochorous potentials of entire floras in a given geographical context. The low performance of most of the species questions the general assumption that most littoral plants are highly adapted to long-distance sea dispersal. Our results support the view that island colonization is a multifactorial process and that the use of dispersal syndromes is insufficient to make biogeographical predictions in macroecology studies. Further research should integrate functional indices (e.g., SDPi) with complementary tools (genetics, remote diaspore tracking) to determine the actual drivers of species dispersal and establishment.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/241895
url http://hdl.handle.net/10261/241895
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
MINECO/CGL2015/67865-P
https://doi.org/10.1111/jbi.14120
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Wiley-VCH
publisher.none.fl_str_mv Wiley-VCH
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 15.811543

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