Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production

Detalhes bibliográficos
Autor(a) principal: Castellani, Tânia Tarabini
Data de Publicação: 2000
Outros Autores: D'eça-neves, Fernanda Faraco
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S0102-33062000000300008
http://hdl.handle.net/11449/211353
Resumo: This study aimed at evaluating seed production and predispersal hazards in a sand dune population of P. polyanthus (Eriocaulaceae) in Southern Brazil. Bad development of flowering capitula was caused by the wind and by interference among umbels. A positive correlation between the proportion of atrophied capitula and the number of capitula/umbels also suggested resource limitation. A caterpillar of a Recurvaria Haworth (Lepidoptera: Gelechiidae) species that eats flowers and a boring caterpillar (Lepidoptera not identified) were the main herbivores. Plants reproducing during the flowering peak had a lower probability of being damaged by Recurvaria sp., suggesting an escape from herbivores by flowering synchronism. The proportion of capitula damaged by herbivores was low, causing a reduction of about 5% in the seed set/plant. The boring caterpillar may or may not cause umbel abortion. When the abortion occurs, seed production is reduced by 12%. Many capitula with no damage and individual flowers (up to 50%) did not produce seeds. Pollination failure could be related to this low rate of seed set. We discuss the fact that the low recruitment of seedlings reported for populations of P. polyanthus did not seem to be limited by seed rain, which was estimated at an average of 8000 seeds/plant even when herbivore damage occurred.
id UNSP_799b15b42bccaeaa977a582dd1d97ede
oai_identifier_str oai:repositorio.unesp.br:11449/211353
network_acronym_str UNSP
network_name_str Repositório Institucional da UNESP
repository_id_str 2946
spelling Population ecology of Paepalanthus polyanthus: predispersal hazards and seed productionEcologia populacional de Paepalanthus polyanthus: riscos de pré-dispersão e produção de sementesPaepalanthus polyanthusherbivoryseed productionpredispersal hazardssand dune slackPaepalanthus polyanthusherbivoriaprodução de sementespré-dispersãodunasThis study aimed at evaluating seed production and predispersal hazards in a sand dune population of P. polyanthus (Eriocaulaceae) in Southern Brazil. Bad development of flowering capitula was caused by the wind and by interference among umbels. A positive correlation between the proportion of atrophied capitula and the number of capitula/umbels also suggested resource limitation. A caterpillar of a Recurvaria Haworth (Lepidoptera: Gelechiidae) species that eats flowers and a boring caterpillar (Lepidoptera not identified) were the main herbivores. Plants reproducing during the flowering peak had a lower probability of being damaged by Recurvaria sp., suggesting an escape from herbivores by flowering synchronism. The proportion of capitula damaged by herbivores was low, causing a reduction of about 5% in the seed set/plant. The boring caterpillar may or may not cause umbel abortion. When the abortion occurs, seed production is reduced by 12%. Many capitula with no damage and individual flowers (up to 50%) did not produce seeds. Pollination failure could be related to this low rate of seed set. We discuss the fact that the low recruitment of seedlings reported for populations of P. polyanthus did not seem to be limited by seed rain, which was estimated at an average of 8000 seeds/plant even when herbivore damage occurred.Este estudo visou avaliar a produção de sementes e os riscos de pré-dispersão em uma população de P. polyanthus (Eriocaulaceae) em dunas costeiras no sul do Brasil. O mal desenvolvimento de capítulos florais foi causado pelo vento e por interferência entre umbelas. Correlação positiva entre a proporção de capítulos atrofiados e o número de capítulos/umbela sugere certa limitação de recursos. A lagarta de uma espécie de Recurvaria Haworth (Lepidoptera: Gelechiidae) que se alimenta de flores, e a lagarta de um brocador (Lepidoptera não identificado) foram os principais herbívoros. Plantas que reproduziram durante o pico de floração tiveram menor probabilidade de serem danificadas pelas lagartas de Recurvaria sp., sugerindo escape à herbivoria por sincronismo na floração. A proporção de capítulos danificados por herbívoros foi baixa, causando redução de 5% na produção total de sementes/planta. O lepidóptero brocador pode causar ou não o aborto de umbela. Na ocorrência deste aborto ocorre redução de 12% na produção de sementes. Muitos capítulos não danificados e flores individuais (acima de 50%) não produziram sementes. Falhas na polinização podem estar relacionadas com esta baixa produção de sementes. É discutido que o baixo recrutamento de plântulas observado na população de P. polyanthus não parece ser limitado pela chuva de sementes, sendo estimada produção média de 8.000 sementes/planta mesmo sob o efeito de herbivoria.Universidade Federal de Santa Catarina, CCBUniversidade Estadual Paulista, IBUniversidade Estadual Paulista, IBSociedade Botânica do BrasilUniversidade Federal de Santa CatarinaUniversidade Estadual Paulista (Unesp)Castellani, Tânia TarabiniD'eça-neves, Fernanda Faraco2021-07-14T10:23:06Z2021-07-14T10:23:06Z2000-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article317-326application/pdfhttp://dx.doi.org/10.1590/S0102-33062000000300008Acta Botanica Brasilica. Belo Horizonte, BA, Brazil: Sociedade Botânica do Brasil, v. 14, n. 3, p. 317-326, 2000.0102-33061677-941Xhttp://hdl.handle.net/11449/21135310.1590/S0102-33062000000300008S0102-33062000000300008S0102-33062000000300008.pdfSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengActa Botanica Brasilicainfo:eu-repo/semantics/openAccess2023-10-20T06:06:33Zoai:repositorio.unesp.br:11449/211353Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-20T06:06:33Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
Ecologia populacional de Paepalanthus polyanthus: riscos de pré-dispersão e produção de sementes
title Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
spellingShingle Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
Castellani, Tânia Tarabini
Paepalanthus polyanthus
herbivory
seed production
predispersal hazards
sand dune slack
Paepalanthus polyanthus
herbivoria
produção de sementes
pré-dispersão
dunas
title_short Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
title_full Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
title_fullStr Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
title_full_unstemmed Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
title_sort Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
author Castellani, Tânia Tarabini
author_facet Castellani, Tânia Tarabini
D'eça-neves, Fernanda Faraco
author_role author
author2 D'eça-neves, Fernanda Faraco
author2_role author
dc.contributor.none.fl_str_mv Universidade Federal de Santa Catarina
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Castellani, Tânia Tarabini
D'eça-neves, Fernanda Faraco
dc.subject.por.fl_str_mv Paepalanthus polyanthus
herbivory
seed production
predispersal hazards
sand dune slack
Paepalanthus polyanthus
herbivoria
produção de sementes
pré-dispersão
dunas
topic Paepalanthus polyanthus
herbivory
seed production
predispersal hazards
sand dune slack
Paepalanthus polyanthus
herbivoria
produção de sementes
pré-dispersão
dunas
description This study aimed at evaluating seed production and predispersal hazards in a sand dune population of P. polyanthus (Eriocaulaceae) in Southern Brazil. Bad development of flowering capitula was caused by the wind and by interference among umbels. A positive correlation between the proportion of atrophied capitula and the number of capitula/umbels also suggested resource limitation. A caterpillar of a Recurvaria Haworth (Lepidoptera: Gelechiidae) species that eats flowers and a boring caterpillar (Lepidoptera not identified) were the main herbivores. Plants reproducing during the flowering peak had a lower probability of being damaged by Recurvaria sp., suggesting an escape from herbivores by flowering synchronism. The proportion of capitula damaged by herbivores was low, causing a reduction of about 5% in the seed set/plant. The boring caterpillar may or may not cause umbel abortion. When the abortion occurs, seed production is reduced by 12%. Many capitula with no damage and individual flowers (up to 50%) did not produce seeds. Pollination failure could be related to this low rate of seed set. We discuss the fact that the low recruitment of seedlings reported for populations of P. polyanthus did not seem to be limited by seed rain, which was estimated at an average of 8000 seeds/plant even when herbivore damage occurred.
publishDate 2000
dc.date.none.fl_str_mv 2000-12
2021-07-14T10:23:06Z
2021-07-14T10:23:06Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/S0102-33062000000300008
Acta Botanica Brasilica. Belo Horizonte, BA, Brazil: Sociedade Botânica do Brasil, v. 14, n. 3, p. 317-326, 2000.
0102-3306
1677-941X
http://hdl.handle.net/11449/211353
10.1590/S0102-33062000000300008
S0102-33062000000300008
S0102-33062000000300008.pdf
url http://dx.doi.org/10.1590/S0102-33062000000300008
http://hdl.handle.net/11449/211353
identifier_str_mv Acta Botanica Brasilica. Belo Horizonte, BA, Brazil: Sociedade Botânica do Brasil, v. 14, n. 3, p. 317-326, 2000.
0102-3306
1677-941X
10.1590/S0102-33062000000300008
S0102-33062000000300008
S0102-33062000000300008.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Acta Botanica Brasilica
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 317-326
application/pdf
dc.publisher.none.fl_str_mv Sociedade Botânica do Brasil
publisher.none.fl_str_mv Sociedade Botânica do Brasil
dc.source.none.fl_str_mv SciELO
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1799964630920986624