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Effect of nectar pillaging by native stingless bees (Hymenoptera: Apidae) in the abscission of flowers of Bougainvillea spectabilis Willd. (Nyctaginaceae) =Efeito da pilhagem de néctar por abelhas nativas sem ferrão (Hymenoptera: Apidae) na abscisão floral de Bougainvillea spectabilis Willd. (Nyctaginaceae)

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Author(s): Rodrigo Arand | Gisele Catian | Paulo Alexandre Bogiani | Igor Inforzato

Journal: Acta Scientiarum : Biological Sciences
ISSN 1679-9283

Volume: 33;
Issue: 4;
Start page: 399;
Date: 2011;
Original page

Keywords: insect-plant interaction | floral damage | neotropical bees | reproductive success | ornamental plant | interação inseto-planta | danos florais | abelhas neotropicais | sucesso reprodutivo | planta ornamental

ABSTRACT
This study had as objective to evaluate whether the pillaging activity by native bees influences floral abscission. Samples were collected in ten individuals of Bougainvillea spectabilis. In the period between May 4 and June 1st, 2009, 2,874 flowers were collected on the ground and 2,895 from the plants, with three-day intervals between each collection and a total of 10 repetitions in each plant. We measured the total of closed flowers, open flowers, robbed flowers, normal flowers, open robbed flowers and nonrobber open flowers, in both soil and plant. For the statistical analysis, the T-test was used to see whether there was a difference between the averages obtained from the evaluated characteristics between the soil flowers and plant flowers. Simple linear regression was used to see whether there was a relationship between the closed flowers and robbed closed flowers found on the ground and open flowers and non-robbed open flowers in the plant. There were significant differences regarding all variables measured between soil and plant.A correlation was found at both closed flowers and robbed closed flowers found on the ground and open flowers and non-robbed open flowers in the plant.O presente trabalho teve como objetivo avaliar a atividade de pilhagemde abelhas nativas influenciando a abscisão floral de Bougainvillea spectabilis. As coletas foram realizadas em dez indivíduos de B. spectabilis. Foram coletadas 2.874 flores no solo e 2.895 na planta no período de 4/5/2009 a 1/6/2009 com intervalo de três dias entre cada coleta, totalizando 10 repetições em cada indivíduo. Foram mensuradas as flores fechadas, flores abertas, flores fechadas pilhadas, flores fechadas não pilhadas, flores abertas pilhadas e flores abertas não pilhadas tanto no solo como na planta. Para as análises estatísticas foi utilizado o Teste-T para verificar se houve diferença entre as médias obtidas das características avaliadas entre as flores do solo e as flores da planta, além de regressão linear simples para verificar se houve relação entre as flores fechadas e flores fechadas pilhadas; flores abertas e flores abertas pilhadas, encontradas no solo e flores fechadas e flores fechadas pilhadas; flores abertas e flores abertas pilhadas na planta. Houve diferença significativa em relação a todas as variáveis entre o solo e a planta. Foi verificada correlação tanto nas flores fechadas e florespilhadas fechadas encontradas no solo quanto nas flores abertas e flores abertas não pilhadas na planta.
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