caa a22 4500 475806638 CHVBK 20180406123748.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/BF00986342 doi (NATIONALLICENCE)springer-10.1007/BF00986342 Competition between the oligolectic bee Ptilothrix plumata (Anthophoridae) and the flower closing beetle Pristimerus calcaratus (Curculionidae) for floral resources of Pavonia cancellata (Malvaceae) [Elektronische Daten] [C. Schlindwein, C. Martins] The flowers ofPavonia cancellata, a creeping ruderal half-shrub of northeastern Brazil, open synchronously at 6:00 h with all anthers already dehisced. The oligolectic beePtilothrix plumata was the most effective pollinator. During 90—180 min, female bees make up to 40 brief pollen collection trips to provision their brood cells. The pollen of about 40 flowers ofP. cancellata is needed to feed one bee larva. The most frequent flower visitors, however, are the specialized curculionid beetlesPristimerus calcaratus, which do not crosspollinate the flowers. They perforate the epidermis with their mouthparts, provoking dehydration, and then actively close the loose petals with their legs. Two hours after opening, half of the flowers had already been closed by the beetles. We interpret the fast, uninterrupted pollen foraging ofPtilothrix plumata bees as a strategy adapted to synchronous pollen presentation ofPavonia and to competition withPristimerus calcaratus: the female bees have to provision their brood cells before the beetles succeed in closing the flowers. Springer-Verlag, 2000 Pollination nationallicence Pavonia cancellata nationallicence Malvaceae nationallicence Ptilothrix plumata nationallicence Anthophoridae nationallicence bees nationallicence Pristimerus calcaratus nationallicence Curculionidae nationallicence northeastern Brazil nationallicence foraging behavior nationallicence pollen presentation nationallicence Schlindwein C. Departamento de Botânica, Universidade Federal de Pernambuco, Av. Prof. Moraes Rêgo s/n, Cidade Universitária, 50670-901, Recife, PE, Brazil aut Martins C. Departamento de Sistemática e Ecologia — CCEN, Universidade Federal da Paraiba, 58059-900, João Pessoa, PB, Brazil aut Plant Systematics and Evolution Springer-Verlag 224/3-4(2000-09-01), 183-194 0378-2697 224:3-4<183 2000 224 606 https://doi.org/10.1007/BF00986342 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00986342 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schlindwein C. Departamento de Botânica, Universidade Federal de Pernambuco, Av. Prof. Moraes Rêgo s/n, Cidade Universitária, 50670-901, Recife, PE, Brazil aut NATIONALLICENCE 700 1- Martins C. Departamento de Sistemática e Ecologia — CCEN, Universidade Federal da Paraiba, 58059-900, João Pessoa, PB, Brazil aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 224/3-4(2000-09-01), 183-194 0378-2697 224:3-4<183 2000 224 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer