Population structure and gene flow of the Brazilian shrub Helicteres brevispira

Franceschinelli, Edivani Villaron; Kesseli, Rick

doi:10.1038/sj.hdy.6884790

Cited by 29 publications

(29 citation statements)

References 32 publications

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“…As fêmeas de C. aureoventris, assim como os indivíduos de P. pretrei, no entanto, atuam como "traplining", promovendo o fluxo gênico a distâncias mais longas. Este fato favorece a coesão genética dentro de uma população (Franceschinelli & Kesseli 1999, Franceschinelli & Bawa 2000, assim como entre populações conspecíficas próximas, e também favorece o cruzamento entre espécies simpátricas. Este último caso justificaria a presença de híbridos em muitos locais de ocorrência destas espécies com outras congenéricas (Taylor 1991, Lambert et al 2006.…”

Section: Resultsunclassified

Biologia reprodutiva de Melocactus glaucescens Buining & Brederoo e M. paucispinus G. Heimen & R. Paul (Cactaceae), na Chapada Diamantina, Nordeste do Brasil

Colaço¹,

Fonseca²,

Lambert³

et al. 2006

Rev. bras. Bot.

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-(Reproductive biology of Melocactus glaucescens Buining & Brederoo and M. paucispinus G. Heimen & R. Paul (Cactaceae), in the Chapada Diamantina, northeastern Brazil). The reproductive biology of Melocactus glaucescens and M. paucispinus (Cactaceae) was studied in the municipality of Morro do Chapéu, Chapada Diamantina, Bahia State, comprising the phenology, floral biology, pollination and mating system of the species. It was recorded flowering and fruiting periods, flower visitors, frequency and kind of visits, and the strategy and behavior of the visitors on the flowers. Experimental pollinations were carried out to determine the mating systems of the species. The flowering period of both Melocactus species overlapped during the study period. The floral characteristics of the species are typical of ornithophily: showy colors, tubular structure, and nectar with low concentration of solutes, between 20% and 30%. The hummingbird Chlorostilbon aureoventris Boucier & Mulsant (1948) was the most frequent flower visitor, performing 82% and 89% of the visits in M. paucispinus and M. glaucescens, respectively. Other hummingbird and butterfly species also visited the flowers of both species. The overlap in the flowering period and the similarity in the guild of pollinators of those and other sympatric species of Melocactus favour the occurrence of hybridization, as it has been observed in that area. Melocactus glaucescens presented self-incompatibility and allogamy. Conversely, M. paucispinus is self-compatible and autogamous, however presenting lower fruit set in selfing than in outcrossing, possibly due to the occurrence of inbreeding depression.

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Section: Resultsunclassified

Biologia reprodutiva de Melocactus glaucescens Buining & Brederoo e M. paucispinus G. Heimen & R. Paul (Cactaceae), na Chapada Diamantina, Nordeste do Brasil

Colaço¹,

Fonseca²,

Lambert³

et al. 2006

Rev. bras. Bot.

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“…However, some authors have argued that the difference between these two estimates gives little indication of biparental inbreeding ( Ritland, 1985; Coates & Sokolowski, 1992). There are also indications that this population is substructured ( Franceschinelli & Kesseli, 1999). Substructuring could have induced biparental inbreeding and high fixation index ( F ) in this population.…”

Section: Discussionmentioning

confidence: 99%

The effect of ecological factors on the mating system of a South American shrub species (Helicteres brevispira)

2000

Self Cite

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Mating systems are in¯uenced by several ecological factors, including plant density, number of owers per plant, and pollinator movements. In this study, we investigated the simultaneous eects of these three factors on the mating system of a self-compatible Brazilian shrub species: Helicteres brevispira St. Hil. Outcrossing rate is directly correlated with plant density. Changes in the number of owers per plant aect outcrossing rate through their eect on the density of¯owers. Variation in foraging behaviour of hummingbird pollinators is a consequence of the interaction between plant density and number of¯owers per plant. Territorialist pollinators are common in high density areas but visit few¯owers on each plant, thereby promoting outcrossing. In areas of low plant density, trapliners and rare territorialists visit several¯owers per plant, thus increasing sel®ng. Our results indicate that outcrossing rate is a dynamic parameter, with the extent of variation depending on a number of ecological factors. In successional species such as those in the genus Helicteres, demographic changes may be accompanied by alterations in mating system parameters, with concomitant eects on the genetic structure of populations.Keywords:¯ower density, Helicteres, mating system, outcrossing rate, plant density, pollinator behaviour. IntroductionMating systems in plants can be in¯uenced by several ecological factors. Wright (1946) demonstrated theoretically that inbreeding is inversely correlated with plant density and gene dispersal, if mating within neighbourhoods is random. As density increases, the eective number of reproducing individuals inside the neighbourhood areas also increases, as does the outcrossing rate. This is particularly true in plant species pollinated by animals, because pollinators tend to¯y to the closest neighbour and most of the pollen is exchanged among neighbouring plants (Levin, 1986; Parra et al., 1993; Boshier et al., 1995; Stacy et al., 1996).Several authors have suggested that high concentration of rewards in space may enhance pollinator activity between plants and thus pollen¯ow (e.g. Ausgspurger, 1980; Wyatt, 1980; Gerber, 1985). Others have suggested that this concentration may restrict pollinator movement and gene¯ow between plants and within populations (e.g. Linhart, 1973;Feinsinger, 1978;Schmitt, 1983; Stacy et al., 1996). Species with dierent spatial patterns of¯oral rewards can also attract guilds of pollinators with distinct foraging strategies. For example, Linhart (1973) andFeinsinger (1978) found that species that produce few¯owers per plant attract trapliner hummingbirds (which visit sequentially the same plants over a wide geographical area), whereas species that produce many¯owers per plant are pollinated by territorial hummingbirds (which visit and defend owering plants that are within their feeding territories). These authors have suggested that traplining and foraging over long distances should promote outcrossing, but that territorial foraging should result in inbreeding (see also B...

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“…However, not many authors studied this fact from individuals perspective, evaluating genetically substructured populations. Franceschinelli and Kesseli (1999) evaluated a population of the pioneer shrub, Helicteres brevispira (Sterculiaceae) and, although they concluded that it was genetically substructured, data did not fit for isolation by distance model. However, for M. fistulifera the model seemed to fit, as Mantel test demonstrated that closer individuals were more similar genetically than distant ones.…”

Section: Discussionmentioning

confidence: 99%

Genetic, morphological and spatial characterization of two populations of Mabea fistulifera Mart. (Euphorbiaceae), in different successional stages

Goulart

Ribeiro

Lovato

2005

Braz. arch. biol. technol.

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Population structure and gene flow of the Brazilian shrub Helicteres brevispira

Cited by 29 publications

References 32 publications

Biologia reprodutiva de Melocactus glaucescens Buining & Brederoo e M. paucispinus G. Heimen & R. Paul (Cactaceae), na Chapada Diamantina, Nordeste do Brasil

Biologia reprodutiva de Melocactus glaucescens Buining & Brederoo e M. paucispinus G. Heimen & R. Paul (Cactaceae), na Chapada Diamantina, Nordeste do Brasil

The effect of ecological factors on the mating system of a South American shrub species (Helicteres brevispira)

Genetic, morphological and spatial characterization of two populations of Mabea fistulifera Mart. (Euphorbiaceae), in different successional stages

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