Browsing by Author "Medel Contreras, Rodrigo"
Now showing items 1-20 of 22
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Pérez, Fernanda; Arroyo, Mary T. K.; Medel Contreras, Rodrigo; Hershkovitz, Mark (BOTANICAL SOC AMER INC, 2006-07)Concerted changes in flower morphology and pollinators provide strong evidence on adaptive evolution. Schizanthus (Solanaccae) has zygomorphic flowers and consists of 12 species of annual or biennial herbs that are distributed ...
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Valiente Banuet, Alfonso; Aizen, Marcelo A.; Alcántara, Julio M.; Arroyo, Juan; Cocucci, Andrea; Galetti, Mauro; García, María B.; García, Daniel; Gómez, José M.; Jordano, Pedro; Medel Contreras, Rodrigo; Navarro, Luis; Obeso, José R.; Oviedo, Ramona; Ramírez, Nelson; Rey, Pedro J.; Traveset, Anna; Verdú, Miguel; Zamora, Regino (John Wiley, 2015)1. The effects of the present biodiversity crisis have been largely focused on the loss of species. However, a missed component of biodiversity loss that often accompanies or even precedes species disappearance is the ...
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Bozinovic, Francisco; Medel Contreras, Rodrigo (Springer-Verlag, 1988)An inferential analysis of the foraging mode (opportunist or mediate by prey selection) of a taxonomic assemblage of raptors in central Chile was conducted. The analysis of energetic aspects such as daily requirements of ...
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Botto Mahan, Carezza; Cattan Ayala, Pedro; Medel Contreras, Rodrigo (ELSEVIER, 2006-07)Parasites have been shown to manipulate the feeding behaviour of their invertebrate vectors, which results in an increased probability of transmission to definitive hosts. Most evidence for this hypothesis comes from ...
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Medel Contreras, Rodrigo (1995)In this paper I examine the extent to which contemporary ecological patterns in 42 harvester ant assemblages of three continents can be explained as a result of present-day environments or from differences in the history ...
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Botto Mahan, Carezza; Ossa, Carmen Gloria; Medel Contreras, Rodrigo (BLACKWELL PUBLISHING, 2008-03)Parasites can reduce host fitness through short-term mortality, complete or partial castration, or slight reductions in host fecundity. Hosts may reduce reproductive effort as an adaptive strategy to tolerate parasitism. ...
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Medel Contreras, Rodrigo; Jiménez, Jaime E.; Jaksic, Fabián; Yáñez, JoséL L.; Armesto, Juan J. (1990)The rare Darwin's fox Dusicyon fulvipes (Martin, 1837) was thought to be restricted to Chiloé Island in southern Chile, and to be a subspecies of Dusicyon griseus. We report the finding of a continental population of D. ...
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Murúa, Maureen; Espinoza, Claudia; Bustamante Araya, Ramiro; Marín Briano, Víctor; Medel Contreras, Rodrigo (Springer, 2010)Pollinator-mediated selection is one of the most important factors driving adaptation in flowering plants. However, as ecological conditions change through habitat loss and fragmentation, the interactions among species ...
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Carvallo, Gastón; Medel Contreras, Rodrigo (SPRINGER, 2009-08-23)Self-pollination mechanisms are often invoked to explain plant reproduction in environments devoid of pollinators. However, populations may evolve a diverse variety of strategies depending on the ecological context of ...
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Cares, Rocío A.; Muñoz, Pablo A.; Medel Contreras, Rodrigo; Botto Mahan, Carezza (Elsevier GmbH., 2013)The nurse-protégé hypothesis states that adult plants of one species provide micro-environmental conditions that favor the establishment of seedlings of a second species with no effect for the first species. Several studies ...
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Gonzáles, Wilfredo L.; Caballero, Paula P.; Medel Contreras, Rodrigo (2005)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 ...
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Medel Contreras, Rodrigo; Valiente, Angela; Botto Mahan, Carezza; Carvallo, Gastón; Pérez, Fernanda; Pohl, Nélida; Navarro, Luis (BLACKWELL, 2007-12)We describe the geographical variation of corolla and nectar guide size in seven populations of Mimulus luteus (Phrymaceae) in central Chile, and examine whether flower phenotypes associate with taxonomic composition and ...
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Fonturbel, Francisco; Candia, Alina; Malebrán, Javiera; Salazar, Daniela; González Browne, Daniela; Medel Contreras, Rodrigo (Wiley-Blackwell, 2015)Anthropogenic habitat disturbance is a strong biodiversity change driver that compromises not only the species persistence but also the ecological interactions in which they are involved. Even though seed dispersal is a ...
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Carvallo, Gastón; Medel Contreras, Rodrigo (SOCIEDAD BIOLGIA CHILE, 2005-12)Most studies of multivariate evolution on the floral phenotype assume that traits evolve independently one from each other, ignoring the modular structure that results from genetic correlations or developmental constraints. ...
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Nonadditive effects of flower damage and hummingbird pollination on the fecundity of Mimulus luteus Pohl, Nélida; Carvallo, Gastón; Botto Mahan, Carezza; Medel Contreras, Rodrigo (SPRINGER, 2006-10)Flower herbivory and pollination have been described as interactive processes that influence each other in their effects on plant reproductive success. Few studies, however, have so far examined their joint effects in ...
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Gonzáles, Wilfredo L.; Suárez, Lorena H.; Medel Contreras, Rodrigo (SPRINGER, 2007-03)Most studies on the fitness advantage of outbreeding in host–parasite systems have been assessed from the host rather than the parasite perspective. Here, we performed experimental pollination treatments to evaluate the ...
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Cuartas Domínguez, Marcela; Medel Contreras, Rodrigo (WILEY-BLACKWELL, 2010-05-20)1. While many studies of flower evolution have relied on the assessment of selection coefficients, these estimates represent correlative evidence of selection. Few studies have combined correlative with experimental ...
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Nattero, J.; Cocucci, A. A.; Medel Contreras, Rodrigo (WILEY-BLACKWELL PUBLISHING, 2010-06-17)Most studies on pollinator-mediated selection have been performed in generalized rather than specialized pollination systems. This situation has impeded evaluation of the extent to which selection acts on attraction ...
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Navarro, Luis; Medel Contreras, Rodrigo (WILEY-BLACKWELL PUBLISHING, 2008-06-02)Although nectar robbing is a common phenomenon in plant species with tubular flowers or flowers with nectar spurs, the potential effect of this illegitimate interaction on plant reproductive success has not received ...
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Fontúrbel, Francisco E.; Jordano, Pedro; Medel Contreras, Rodrigo (Wiley & Sons, 2015)Transformed habitats are the result of deliberate replacement of native species by an exotic monoculture, involving changes in biotic and abiotic conditions. Despite the fact that transformed habitats are becoming more ...