Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Acta Botanica Brasilica |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062000000300008 |
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. |
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Population ecology of Paepalanthus polyanthus: predispersal hazards and seed productionPaepalanthus polyanthusherbivoryseed productionpredispersal hazardssand dune slackThis 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.Sociedade Botânica do Brasil2000-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062000000300008Acta Botanica Brasilica v.14 n.3 2000reponame:Acta Botanica Brasilicainstname:Sociedade Botânica do Brasil (SBB)instacron:SBB10.1590/S0102-33062000000300008info:eu-repo/semantics/openAccessCastellani,Tânia Tarabinid'Eça-Neves,Fernanda Faracoeng2001-08-10T00:00:00Zoai:scielo:S0102-33062000000300008Revistahttps://www.scielo.br/j/abb/ONGhttps://old.scielo.br/oai/scielo-oai.phpacta@botanica.org.br||acta@botanica.org.br|| f.a.r.santos@gmail.com1677-941X0102-3306opendoar:2001-08-10T00:00Acta Botanica Brasilica - Sociedade Botânica do Brasil (SBB)false |
dc.title.none.fl_str_mv |
Population ecology of Paepalanthus polyanthus: predispersal hazards and seed production |
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 |
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.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 |
topic |
Paepalanthus polyanthus herbivory seed production predispersal hazards sand dune slack |
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 |
2000-12-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062000000300008 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062000000300008 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0102-33062000000300008 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
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 |
Acta Botanica Brasilica v.14 n.3 2000 reponame:Acta Botanica Brasilica instname:Sociedade Botânica do Brasil (SBB) instacron:SBB |
instname_str |
Sociedade Botânica do Brasil (SBB) |
instacron_str |
SBB |
institution |
SBB |
reponame_str |
Acta Botanica Brasilica |
collection |
Acta Botanica Brasilica |
repository.name.fl_str_mv |
Acta Botanica Brasilica - Sociedade Botânica do Brasil (SBB) |
repository.mail.fl_str_mv |
acta@botanica.org.br||acta@botanica.org.br|| f.a.r.santos@gmail.com |
_version_ |
1752126656396394496 |