Biologia reprodutiva, visitantes florais e dispersão de Ocotea duckei Vattimo-Gil (Lauraceae) na Reserva Biológica Guaribas, Paraíba, Brasil

Nóbrega, Sanna Rocha; Fortunato, Márcia Emanuelle Madruga; Quirino, Zelma Glebya Maciel

doi:10.21707/gs.v10.n04a20

Cited by 2 publications

(3 citation statements)

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“…The predominance of Diptera as major floral visitors, herein described for O. catharinensis , was also recorded to O. duckeii (Nóbrega et al . ). Pollinator type is often related to nectar sugar composition, either sucrose or hexoses (Baker & Baker ; Pacini & Nepi ), and Diptera insects are linked to sucrose‐poor/hexose‐rich nectar (Baker & Baker ; Wolff ).…”

Section: Discussionmentioning

confidence: 97%

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Reproductive ecology ofOcotea catharinensis, an endangered tree species

et al. 2018

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Ocotea catharinensis (Lauraceae) is an endangered tree species from the Brazilian Atlantic Rainforest. Currently, little is known about the reproductive ecology of this species. Aiming to propose conservation measures, we described aspects related to phenology, floral biology, pollination, seed dispersal and mating system of O. catharinensis. We conducted phenological observations in 62 individuals for 2 years. In one reproductive event, we evaluated nectar production, stigmatic receptivity and pollen viability. Floral visitors were observed, identified and classified on a scale of pollination effectiveness. Seed dispersers were observed and identified using camera traps. Finally, the mating system was evaluated through pollen/ovule ratios, experimental pollination treatments and genetic analysis with molecular markers. Ocotea catharinensis presented a supra-annual fruiting pattern with a substantial reduction of reproducing individuals from bud phase to ripe fruit phase. Several mechanisms prompting cross-fertilisation were identified, such as attractive, herkogamic and protogynic flowers. The main floral visitors and pollinators were from the Diptera order, and all seed dispersers were birds. The species presented a predominantly outcrossed mixed mating system with significant selfing rate (17.3%). Although based on restricted evidence, we hypothesised that selfing is an escape mechanism for situations unfavourable to cross-fertilisation. Specifically, for the studied population selfing is a response to reduced population size, which is caused by the non-reproduction of all potentially reproductive individuals and by past exploitation events. Therefore, conservation efforts should be able to enhance population sizes, as well as prevent overexploitation.

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Section: Discussionmentioning

confidence: 97%

“…), Diptera (Nóbrega et al . ), Hemiptera (Souza & Moscheta ) and Thysanoptera (Danieli‐Silva & Varassin ). Nevertheless, hymenopterans seem to be the more frequent and diverse floral visitors to Lauraceae species.…”

Section: Discussionmentioning

confidence: 99%

Reproductive ecology ofOcotea catharinensis, an endangered tree species

et al. 2018

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“…As angiospermas têm evoluído de sistemas unissexuados na tentativa de evitar depressão endogâmica (Gibson & Diggle 1997). E no caso da espécie gimnodióica, O. duckei, esse sistema sexual é considerado uma condição evolutiva intermediária (Gibson & Diggle 1997, Nóbrega et al 2016.…”

Section: Resultsunclassified

Sistemas de Polinização em um remanescente de Mata Atlântica Paraibana

Nóbrega

Quirino

2020

RSD

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Os processos de interação planta-animal são importantes para a compreensão da dinâmica na comunidade, entre eles a polinização, que é a transferência de pólen das anteras para o estigma através de vetores bióticos e/ou abióticos. Neste estudo foram descritos os sistemas de polinização presentes em uma área de Mata Atlântica paraibana e caracterizada a morfologia floral das espécies. A Reserva Biológica Guaribas localiza-se no município de Mamanguape – PB, nesta área foi coletado o material botânico em trilhas pré-existentes e posteriormente analisado em laboratório. Foram estudadas 111 espécies, pertencentes a 96 gêneros e 46 famílias, nas quais, predominaram: flores de cor clara, com ausência de odor, tamanho pequeno, corola tubular, simetria actinomorfa e hermafroditas. As espécies se distribuíram entre cinco principais síndromes de polinização, predominando a melitofilia (82%), seguida da ornitofilia (8%), psicofilia e esfingofilia (4,5%), e quiropterofilia (1%). Em ecossistemas naturais as interações planta-animal são importantes na estrutura e dinâmica ambiental. A ocorrência de espécies melitófilas tem sido descrita como um atributo predominante no domínio Mata Atlântica, o que também foi constatado neste estudo.

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Biologia reprodutiva, visitantes florais e dispersão de Ocotea duckei Vattimo-Gil (Lauraceae) na Reserva Biológica Guaribas, Paraíba, Brasil

Cited by 2 publications

References 4 publications

Reproductive ecology ofOcotea catharinensis, an endangered tree species

Reproductive ecology ofOcotea catharinensis, an endangered tree species

Sistemas de Polinização em um remanescente de Mata Atlântica Paraibana

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