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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Divergence on floral traits and vertebrate pollinators of two endemic Encholirium bromeliads

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Autor(es):
Christianini, A. V. [1] ; Forzza, R. C. [2] ; Buzato, S. [3]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos, Sorocaba, SP - Brazil
[2] Inst Pesquisas Jardim Bot Rio de Janeiro, Rio De Janeiro, RJ - Brazil
[3] Univ Sao Paulo, Dept Ecol, Inst Biociencias, BR-05508900 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Plant Biology; v. 15, n. 2, p. 360-368, MAR 2013.
Citações Web of Science: 12
Resumo

Shifts in pollen vectors favour diversification of floral traits, and differences in pollination strategies between congeneric sympatric species can contribute to reproductive isolation. Divergence in flowering phenology and selfing could also reduce interspecific crossing between self-compatible species. We investigated floral traits and visitation rates of pollinators of two sympatric Encholirium species on rocky outcrops to evaluate whether prior knowledge of floral characters could indicate actual pollinators. Data on flowering phenology, visitation rates and breeding system were used to evaluate reproductive isolation. Flowering phenology overlapped between species, but there were differences in floral characters, nectar volume and concentration. Several hummingbird species visited flowers of both Encholirium spp., but the endemic bat Lonchophylla bokermanni and an unidentified sphingid only visited E.vogelii. Pollination treatments demonstrated that E.heloisae and E.vogelii were partially self-compatible, with weak pollen limitation to seed set. Herbivores feeding on inflorescences decreased reproductive output of both species, but for E.vogelii the damage was higher. Our results indicate that actual pollinators can be known beforehand through floral traits, in agreement with pollination syndromes stating that a set of floral traits can be associated with the attraction of specific groups of pollinators. Divergence on floral traits and pollinator assemblage indicate that shifts in pollination strategies contribute to reproductive isolation between these Encholirium species, not divergence on flowering phenology or selfing. We suggest that hummingbird pollination might be the ancestral condition in Encholirium and that evolution of bat pollination made a substantial contribution to the diversification of this clade. (AU)

Processo FAPESP: 97/13341-6 - Polinizacao de duas especies de encholirium (bromeliaceae) na serra do cipo minas gerais.
Beneficiário:Silvana Buzato
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 97/10582-2 - Polinizacao de duas especies de encholirium (bromeliaceae) na serra do cipo, minas gerais.
Beneficiário:Alexander Vicente Christianini
Modalidade de apoio: Bolsas no Brasil - Iniciação Científica