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      Reproductive biology in species of Bidens L. (Asteraceae) Translated title: Biologia reprodutiva em espécies de Bidens L. (Asteraceae)

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          Abstract

          Studies about reproductive biology of weed species can have implications on the establishment of controlling practices that minimize the effects of these weed populations on agricultural fields. The pollination biology of Bidens alba (L.) DC., B. pilosa L., and Bidens subalternans DC., was studied at different sites and climatic seasons. Bidens pilosa and B. subalternans are widely distributed in agricultural areas, in disturbed habitats, and along road sides. Bidens alba occur only along the coast. The three species are self-compatible and non agamospermous. The composition of the pollinator community changes during the year and between sites. Hymenopterans and lepidopterans are the most frequent visitors to Bidens species in both areas studied. Although the species are self-compatible, the presence of pollinators may affect the levels of inbreeding. The attraction of insects by Bidens species may be benefical to agricultural crop and may also have important implications for conservation biology.

          Translated abstract

          Estudos de biologia reprodutiva de espécies invasoras podem ter implicações sobre o estabelecimento de práticas de controle que minimizem o efeito das populações destas espécies em áreas agrícolas. A biologia da polinização de Bidens alba (L.) DC., B. pilosa L. e Bidens subalternans DC. foi estudada em diferentes locais e estações climáticas. Bidens pilosa e B. subalternans são espécies amplamente distribuídas em áreas agrícolas, em habitats perturbados e em margens de estradas. Bidens alba ocorre somente em regiões litorâneas. As três espécies são auto-compatíveis e não são agamospérmicas. A composição da comunidade de polinizadores apresenta diferenças durante o ano e entre locais. Himenópteros e lepidópteros são os visitantes mais freqüentes nas espécies de Bidens. Embora as espécies sejam auto compatíveis, a presença de polinizadores pode afetar os níveis de endocruzamento. A atração de insetos por espécies de Bidens pode beneficiar as culturas agrícolas e apresentar importantes implicações para a biologia da conservação.

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          Most cited references24

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          Daily Patterns of Pollinator Activity, Differential Pollinating Effectiveness, and Floral Resource Availability, in a Summer-Flowering Mediterranean Shrub

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            Pollinator Foraging Behavior and Gene Dispersal in Senecio (Compositae)

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              [Incidence, evolution and prognosis of posthemorrhagic ventriculomegaly in a population of newborns of less than 33 weeks gestational age].

              Posthemorrhagic ventriculomegaly is one of the most important neurological problems encountered in the premature new-born. The aim of this study was to evaluate its incidence in a tertiary neonatal unit at Lille, France, to study its evolution, the risk of ventriculoperitoneal shunt and the neurodevelopmental outcome.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                sa
                Scientia Agricola
                Sci. agric. (Piracicaba, Braz.)
                São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" (Piracicaba )
                1678-992X
                April 2004
                : 61
                : 2
                : 185-189
                Affiliations
                [1 ] Universidade Estadual de Campinas Brazil
                [2 ] Universidade Estadual de Campinas Brazil
                Article
                S0103-90162004000200010
                10.1590/S0103-90162004000200010
                e1268f32-13a5-4da8-86a9-5f12c7916f4d

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-9016&lng=en
                Categories
                AGRICULTURE, MULTIDISCIPLINARY

                General agriculture
                floral visitors,pollination biology,weed species,visitantes florais,biologia da polinização,plantas daninhas

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