Frugivoria e especificidade por hospedeiros na erva-de-passarinho Phoradendron rubrum (L.) Griseb. (Viscaceae)

Cazetta, Eliana; Galetti, Mauro

doi:10.1590/s0100-84042007000200017

Cited by 13 publications

(16 citation statements)

References 23 publications

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“…The spatial pattern of seed dispersal of mistletoes depends on the dispersal vectors, usually small frugivorous birds, including Euphonia tanagers and tyrant flycatchers, such as Elaenia spp. (Restrepo 1987;Cazetta & Galetti 2007;Guerra & Pizo 2014). The seed rain of mistletoes is tied to the post-feeding behavior and plant visiting frequency of their dispersal counterparts (López de Buen & Ornelas 1999;Roxburgh & Nicolson 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Some mistletoes are considered generalists and show low host specificity, being able to parasitize several species of host plants, whereas others are considered specialists and infect one or a few common hosts (Norton & Carpenter 1998;Fadini 2011). However, even generalist mistletoes may show preferences for certain hosts (Sargent 1995;Cazetta & Galetti 2007;Arruda et al 2012). Empirical data indicate that mistletoes are much more dependent on the bird seed dispersers than vice versa (Guerra & Pizo 2014).…”

Section: Introductionmentioning

confidence: 99%

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Host specificity and experimental assessment of the early establishment of the mistletoe Phoradendron crassifolium (Pohl ex DC.) Eichler (Santalaceae) in a fragment of Atlantic Forest in southeast Brazil

et al. 2014

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Mistletoe establishment relies heavily on a seed reaching a proper host plant. Small frugivorous birds usually disperse large numbers of mistletoe seeds. However, in the field, mistletoes are absent from some potential available hosts. We investigated whether the mistletoe Phoradendron crassifolium has some preferences for specific host trees in a fragment of Atlantic Forest in southeast Brazil. We surveyed 397 tree individuals of 50 species within 25 families. Seven of those species (14%) bore P. crassifolium infections. Although prevalence at the individual level was low (11.6%), there were marked deviations in infection levels among species and families. Most (87%) of the infections (40 of 46) occurred in species belonging to the families Anacardiaceae (Lithraea molleoides and Tapirira guianensis) and Siparunaceae (Siparuna guianensis), which nevertheless accounted for only 26% of the potential individual hosts (103 of 397). We also performed an experiment simulating bird behavior. We inoculated 480 mistletoe seeds to the bark of four potential hosts in field, following the fate of the seeds for five months. No differences in host preference were observed. The low specificity detected at the local level was confirmed by a survey of exsiccata collected over the geographical distribution of the mistletoe, suggesting that P. crassifolium prevalence is more dependent on dispersal limitation than on mistletoe-host compatibility.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Host specificity and experimental assessment of the early establishment of the mistletoe Phoradendron crassifolium (Pohl ex DC.) Eichler (Santalaceae) in a fragment of Atlantic Forest in southeast Brazil

et al. 2014

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“…The seed dispersal in Phoradendron, as in most mistletoe genera, takes place by birds (Kuijt 2003). Cazetta & Galetti (2007) showed that Phoradendron quadrangulare is almost exclusively dispersed by Euphonia (Fringillidae), which defecate seeds in clumps on host branches. Visceae-bird interactions are performed by birds that belong to Thraupinae and Euphonia/Chlorophonia groups (Restrepo et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Structural development of the fruits and seeds in three mistletoe species of Phoradendron (Visceae: Santalaceae)

2016

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Phoradendron is a New World genus of chlorophyllous hemiparasite plants with the distribution extending from the United States to Argentina, including the West Indies. The names given to the fruits within the Visceae are variable and include a viscous berry or pseudoberry bearing a single seed lacking the testa. Here, it was performed an anatomical study about the development of fruit and seed of three species of Phoradendron. During the fruit development the structure of the mesocarp undergoes intense activity of cell division, and it differentiates onto two new mesocarpic regions: the parenchyma and the viscid layer. In its maturity, the seed is ategmic, presenting the embryo entirely embedded within a chlorophyllous endosperm. The occurrence of chlorophyll in the endosperm may be associated to absence of integuments on the seed, which allows the light to reach the seminal tissues throughout the somewhat transparent pericarp. In addition, the Pomaceous fruit, "viscidio" type is proposed as an alternative classification for Phoradendron fruits. Key words: anatomy, chlorophyllous endosperm, fruit classification, semiparasite plant. ResumoPhoradendron é um gênero de plantas hemiparasitas clorofiladas do Novo Mundo, que tem distribuição desde os Estados Unidos até a Argentina, incluindo o leste da Índia. Os nomes dados aos frutos de representantes de Visceae são variáveis, incluindo baga viscosa ou pseudobaga, apresentando uma única semente sem testa. Nesse trabalho, foi realizado um estudo anatômico para investigar o desenvolvimento do fruto e da semente de três espécies de Phorodendron. Durante o desenvolvimento do fruto, a estrutura do mesocarpo sofre intensa atividade de divisão celular; diferenciando-se em duas novas regiões mesocárpicas: uma camada parenquimática e outra de viscina. Quando o fruto amadurece, a semente atégmica, apresenta embrião inteiramente embebido em um endosperma clorofiliano. A ocorrência de clorofila no endosperma pode estar associada à ausência de tegumentos seminais, permitindo que a luz alcance os tecidos da semente, através do um pericarpo relativamente transparente. Em adição, fruto Pomaceo do tipo viscidio é proposto como uma alternativa para a classificação de frutos para o gênero Phoradendron. Palavras-chave: anatomia, endosperma clorofiliano, classificação de frutos, planta hemiparasita.

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“…Many factors may determine the local degree of host specifi city in mistletoes, e.g., the relative abundance of hosts (Norton & Carpenter 1998), bird perch preferences (Monteiro et al 1992;Cazetta & Galetti 2007), branch architecture (Arruda & Carvalho 2004;Arruda et al 2006), bark thickness (Sargent 1995) and mistletoe-host compatibility (perhaps determined by chemical, physiological and physical processes at the mistletoe-host interface) (Lamont 1983;López de Buen & Ornelas 2002;Fadini 2011). Birds provide the initial fi lter in determining the frequency of seed distribution onto the available hosts, whereas the hosts provide the fi nal fi lter for mistletoe establishment.…”

Section: Mistletoe-host Interactionsmentioning

confidence: 99%

“…Th ere are few detailed studies on mistletoe frugivory and seed dispersal in Brazil. Cazetta & Galetti (2007) showed that Phoradendron quadrangulare (Kunth) Griseb. (as well as Phoradendron rubrum (L.) Griseb.)…”

Section: Mistletoe Pollination and Seed Dispersalmentioning

confidence: 99%

Ecology of neotropical mistletoes: an important canopy-dwelling component of Brazilian ecosystems

et al. 2012

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Ecology of neotropical mistletoes: an important canopy-dwelling component of Brazilian ecosystems RESUMO (Ecologia de ervas-de-passarinho Neotropicais: um importante componente do dossel de ecossistemas brasileiros). Ervas-de-passarinho têm sim sido regularmente estudadas em países temperados por afetar negativamente espécies cultivadas e fl orestas manejadas. Em comparação com ambientes temperados pouco se conhece sobre a ecologia das ervas-de-passarinho neotropicais. Desta forma, é necessário maior conhecimento sobre o grupo porque são importantes elementos de comunidades vegetais, atuando como recurso-chave para polinizadores, dispersores de sementes e herbívoros. Através de uma combinação de trabalhos clássicos já publicados com evidências empíricas recentes, nós apresentamos padrões emergentes da interação entre ervas-de-passarinho com os organismos associados e questionamentos para estudos adicionais. Existe um crescente interesse neste grupo no Brasil. E embora existam informações sobre dispersão de sementes, estudos sobre biologia reprodutiva são raros e representam um campo a ser explorado. O conhecimento da biologia básica das ervas-de-passarinho será relevante para modelar sua distribuição espacial usando uma abordagem metapopulacional ou epidemiológica. Nesta revisão nós sumarizamos os principais estudos conduzidos na região Neotropical para fornecer um panorama atual das pesquisas desenvolvidas, bem como novas ideias para futuras investigações, especialmente no Brasil. Palavras ABSTRACT(Ecology of neotropical mistletoes: an important canopy-dwelling component of Brazilian ecosystems). 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 fi ndings 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. Th ere has been increasing interest in working with mistletoes in Brazil. Although there are some data on the ecology of mistletoe seed dispersal, reproductive biology studies are scarce and represent a wide range of fi eldwork to be explored. Knowledge of the basic biology of mistletoes will be very important for modeling their spatial distribution using metapopulation or epidemiological approaches. In this review, we summarize the studies conducted in the neotropical region in order to provide a framework for current research and new ideas for future investigations of mistletoes, especially in Brazil. Revisão / ReviewActa bot. bras. 26(2): 264-274. 2012.Ecology of neotropical mistletoes: an important canopy-dwelling component of Brazilian ecosystems

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Frugivoria e especificidade por hospedeiros na erva-de-passarinho Phoradendron rubrum (L.) Griseb. (Viscaceae)

Cited by 13 publications

References 23 publications

Host specificity and experimental assessment of the early establishment of the mistletoe Phoradendron crassifolium (Pohl ex DC.) Eichler (Santalaceae) in a fragment of Atlantic Forest in southeast Brazil

Host specificity and experimental assessment of the early establishment of the mistletoe Phoradendron crassifolium (Pohl ex DC.) Eichler (Santalaceae) in a fragment of Atlantic Forest in southeast Brazil

Structural development of the fruits and seeds in three mistletoe species of Phoradendron (Visceae: Santalaceae)

Ecology of neotropical mistletoes: an important canopy-dwelling component of Brazilian ecosystems

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