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Title: Habitat disturbance determines the strength of isolating barriers in autumnal hybridizing species of Narcissus
Authors: Marques, Isabel
Aguilar, Javier Fuertes Aguilar
Martins-Loução, Maria Amélia
Feliner, Gonzalo Nieto
Keywords: Pollinator fidelity
Flowering phenology
Reproductive isolation
Natural hybridization
Habitat disturbance
Issue Date: 2010
Citation: Proceedings B, 2010, 1-34
Abstract: Evolutionary outcomes of hybridization between congeneric speciesn with overlapping flowering periods depend on the strength of reproductive isolating barriers. Here, we address the role of two major pre-zygotic barriers in preventing hybridization between three hybridizing species of Narcissus. Field experiments, performed during five years in eight populations, showed that flowering asynchrony and especially pollinator fidelity significantly reduced interspecific gene flow. In some populations,pollinator fidelity was so strong that isolation was complete and a strong negative correlation was found between the strength of this barrier and the abundance of hybrid plants. This result is striking given that the three species are pollinated by generalist insects and thus, pollinator specificity is not a major expectation. The patterns of pollinator fidelity, which are consistent for each population, may be explained by local characteristics such as the abundance of open flowers or the degree of habitat disturbance. Our results indicates that hybrid formation between these species occurs repeatedly and independently in disturbed sites where pollinator fidelity patterns have been broken and therefore that the evolutionary fate of hybrids differs for each population.
Peer review: yes
ISSN: 0962-8452
Appears in Collections:FC - Artigos em Revistas Internacionais

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