Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/55120
Type: Artigo de periódico
Title: At daybreak - Reproductive biology and isolating mechanisms of Cirrhaea dependens (Orchidaceae)
Author: Pansarin, ER
Bittrich, V
Amaral, MCE
Abstract: Floral biology, reproduction, pollinator specificity, and fruit set of Cirrhaea dependens were recorded in forest areas of Southeastern Brazil. Cirrhaea dependens is a lithophytic or epiphytic herb occurring very sparsely below dense canopies. Nearly all the flowers of a single plant open simultaneously before dawn. They are short-lasting and offer floral fragrances as rewards, which are collected by male euglossine bees. Observations carried out in mesophytic forests at Serra do japi revealed that Euglossa viridis is their principal pollinator, with Euffiesea violacea a sporadic co-pollinator. Visitation started soon after flower opening, and attractiveness remained high for about 2 h, decreasing abruptly at sunrise. Flower anthesis with subsequent fragrance release seems to be correlated with bee attraction. Observations using chemical baits were carried out at Serra do japi, and in the Atlantic Rain Forest of Picinguaba. Three euglossine species were captured with pollinaria of C dependens in Picinguaba, whereas only E. violacea was attracted in Serra do japi. In Picinguaba, C dependens occurs sympatrically with C saccata and C loddigesii. Each species attracted different pollinators. The specificity and resulting reproductive isolation are due to the production of different odours by each orchid species. Cirrhaea dependens is self-compatible but pollinator-dependent. The reproductive success was low and appears to result from a combination of factors discussed here, such as the production of short-lived flowers, presence of floral mechanisms avoiding self-pollination, non-synchronization of flower phases among plants, and populations with few and sparsely distributed individuals.
Subject: Cirrhaea
Euglossini
Orchidaceae
pollination
reproductive biology
reproductive success
Stanhopeinae
Country: Alemanha
Editor: Georg Thieme Verlag Kg
Rights: fechado
Identifier DOI: 10.1055/s-2006-923800
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
WOS000239561100009.pdf287.5 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.