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Effects of the parasitism of Struthanthus flexicaulis (Mart.) Mart. (Loranthaceae) on the fitness of Mimosa calodendron Mart. (Fabaceae), an endemic shrub from rupestrian fields over ironstone outcrops, Minas Gerais State, Brazil Acta Botanica
Mourão,Fabiana Alves; Jacobi,Claudia Maria; Figueira,José Eugênio Côrtes; Batista,Eugênia Kelly Luciano.
Parasitic plants (mistletoes) may alter the growth, reproduction and physiology of their hosts. Mimosa calodendron (Fabaceae) is a legume abundant in rupestrian fields on ironstone outcrops, frequently attacked by the hemiparasite Struthanthus flexicaulis (Loranthaceae). The objective of this study was to evaluate the consequences of parasitism by S. flexicaulis on the fitness of M. calodendron. The intensity of parasitism and mortality on hosts of different sizes was evaluated, and foliage cover, fruit and seed set in parasitized and non-parasitized individuals were compared. More than 65% of a population of 1820 individuals was attacked. Host density positively influenced parasitism. The mortality and number of attacked hosts increased with their crown...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ironstone; Mimosa; Parasitism; Reproductive success; Struthanthus.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000300023
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Ecology of neotropical mistletoes: an important canopy-dwelling component of Brazilian ecosystems Acta Botanica
Arruda,Rafael; Fadini,Rodrigo Ferreira; Carvalho,Lucélia Nobre; Del-Claro,Kleber; Mourão,Fabiana Alves; Jacobi,Claudia Maria; Teodoro,Grazielle Sales; Berg,Eduardo van den; Caires,Claudenir Simões; Dettke,Greta Aline.
Mistletoes have been studied in temperate countries regularly because they can be pests of cultivated plants and forest plantations. In comparison with temperate habitats, little is known about the ecology of mistletoes in the Neotropics. More emphasis should be given to neotropical mistletoes because they could be important elements of plant communities, acting as key resources for pollinators, seed dispersers and herbivores. Using a combination of findings from early mistletoe studies and empirical evidence from several recent case studies, we report emerging patterns of mistletoe interactions with associated organisms and propose aims for further studies. There has been increasing interest in working with mistletoes in Brazil. Although there are some...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemiparasites; Biological conservation; Host specificity; Host compatibility.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000200003
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Two mistletoes are too many?: Interspecific occurrence of mistletoes on the same host tree Acta Botanica
Arruda,Rafael; Lunardelli,Caroline; Kitagawa,Clóvis; Caires,Claudenir Simões; Teodoro,Grazielle Sales; Mourão,Fabiana Alves.
Mistletoe can have a major impact on the fitness of the host plant. If there is more than one species of mistletoe on the same host tree, the overall impact might be amplified. We report the occurrence of more than one species of mistletoe on the same host tree. Although it is not a rule in the field, to our knowledge, there have been no studies of this topic. In most cases, two species of mistletoe were recorded on the same host tree, although we recorded three species of mistletoe on one occasion. This demonstrates that different species of mistletoe can be compatible with the same host species. Therefore, compatibility (structural and physiological) might be an important factor for the occurrence of mistletoe. Recent studies have shown that if the...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Parasite-host relationship; Compatibility; Specificity; Parasitic plants; Red Queen hypothesis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100021
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Host preference of the hemiparasite Struthanthus flexicaulis (Loranthaceae) in ironstone outcrop plant communities, southeast Brazil Acta Botanica
Mourão,Fabiana Alves; Pinheiro,Rafael Barros Pereira; Jacobi,Claudia Maria; Figueira,José Eugênio Côrtes.
Struthanthus flexicaulis is a hemiparasite abundant in ironstone outcrops in southeast Brazil. We evaluated its host preference among species of the plant community, taking into account the abundance and foliage cover of the hosts. The importance of each species in the community and the mortality caused by the parasite were assessed based on a quantitative survey in 10 strips measuring 1m x 50m. The 10,290 individuals belonged to 42 species. Only 15 had a relative abundance in the plant community greater than 1%, of which 12 showed vestiges of parasitism. More than 80% of deaths in the community were associated with parasitism. Non-infected individuals had significantly less mortality rates (7%) than those infected (83%) (²= 1102.4, df = 1, p < 0.001)....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canga; Iron Quadrangle; Ironstone outcrop; Plant-plant interaction; Parasitism.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100041
Registros recuperados: 4
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