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OSSA,CARMEN G; MEDEL,RODRIGO. |
We report some aspects of the floral biology ofEchinopsis chiloensis ssp. chiloensis in a population near to the northern limit of its distribution. Anthesis is strictly diurnal and flowers remain open during 492 min on the average. Echinopsis chiloensis is self-incompatible. Flower longevity, nectar production along day, and floral visitors indicate that this population fits well to a diurnal insect pollination syndrome. These results contrast with a previous report indicating nocturnal anthesis and mixed mellitophylous-sphingophylous pollination syndrome in populations near to the southern limit of the distribution range. We suggest that the pollination syndrome of E. chiloensis is a labile rather than fixed condition that may depend on the abiotic... |
Tipo: Journal article |
Palavras-chave: Flower longevity; Nectar production; Pollination syndrome; Flower adaptation. |
Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200012 |
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MEDEL,RODRIGO; BOTTO-MAHAN,CAREZZA; SMITH-RAMÍREZ,CECILIA; MÉNDEZ,MARCO A.; OSSA,CARMEN G.; CAPUTO,LUCIANO; GONZÁLES,WILFREDO L.. |
Presentamos información cuantitativa de la historia natural de la relación parásito-hospedero constituida por el muérdago holoparásito Tristerix aphyllus (Loranthaceae) y sus hospederos cactáceas. Más específicamente, indagamos en los determinantes históricos y biogeográficos de la interacción y cuantificamos la autoecología de la biología floral, polinización, dispersión y parasitismo en este sistema. El impacto del parasitismo sobre la evolución de sistemas defensivos en las cactáceas hospederas es considerado tanto a nivel intraespecífico como interespecífico, tomando en cuenta el potencial para selección mediada por parásitos y la estructura geográfica de la interacción. Finalmente, sugerimos futuras avenidas de investigación en este sistema que... |
Tipo: Journal article |
Palavras-chave: Loranthaceae; Cactaceae; Parasitismo; Estrategias defensivas; Mosaico geográfico; Muérdago; Coevolución. |
Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100012 |
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ESPINOZA,CLAUDIA L; MURÚA,MAUREEN; BUSTAMANTE,RAMIRO O; MARÍN,VÍCTOR H; MEDEL,RODRIGO. |
The indirect impact of flower herbivory on plant reproduction depends on the pollination environment, particularly on the presence or absence of pollinator species with the ability to discriminate damaged from undamaged flowers. The change in pollinator assemblages, due to habitat modification, may modify the impact of flower herbivory on plant reproductive success. In this work, we evaluate the effect of flower herbivory on the seed production of Viola portalesia (Gay) in two contrasting environments, a native and low-disturbed habitat and an extensively transformed habitat characterized by Pinus radiata plantations. Even though the two habitats differed substantially in the composition of pollinator assemblages and visitation rate, the flower damage... |
Tipo: Journal article |
Palavras-chave: Flower herbivory; Habitat loss; Maulino forest; Pinus radiata; Pollination. |
Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400012 |
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GONZÁLES,WILFREDO L.; CABALLERO,PAULA P.; MEDEL,RODRIGO. |
We evaluated experimentally the effect of a gall-maker insect on vegetative and reproductive traits of the shrub Colliguaja integerrima (Euphorbiaceae). We performed two experiments: (1) a chemical (insecticide) exclusion to prevent gall formation, and (2) a mechanical removal of new galls at the early stage to prevent gall growth. In the study area, galled shrubs were common (77 %). Because the pattern of insect attack may influence plant fitness, the distribution of egg clusters deposited by the galler and the number of galls among shrubs were also evaluated. Fruit production was inversely associated with the number of galls, but did not correlate with shrub height, shrub cover, and number of shoots. Ungalled shoots were longer than galled shoots after... |
Tipo: Journal article |
Palavras-chave: Bud-galling insect; Central Chile; Mediterranean ecosystem. |
Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300003 |
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