UvA-DARE (Digital Academic Repository) PAIAF/It tc0t0G~ Amazonia during the last glacial

Amazonia during the last glacial van der Hammen, T.; Absy, M.L. Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract New data on the vegetational history and Quaternary geology of Amazonia permit an improved reconstruction of past environments in Amazonia during the last glacial period. Although limited, data from Rondonia, Carajas and Guyana show that, in certain areas, savanna-type vegetation and savanna forest had replaced the rain forest during the late Pleniglacial (ca

Decentralised velocity feedback control unit using a triangular piezoelectric actuator

The Solanaceae family has a wide distribution, mainly in the tropical and subtropical areas of South America. Solanum L. is one of the most important genera of the family with approximately 1,200 species. The objective of this work was to study the floral biology, pollen morphology as well as to investigate the bee visitors of S. stramoniifolium. Preliminary data indicate the presence of one species of stinging bee and four species of stingless bees as visitors to S. stramoniifolium. The pollen of S. stramoniifolium is tricolporate and psilate or without ornamentation. In a word, S. stramoniifolium constitutes a potential source of pollen for different species of bees with and without sting, providing an interesting field for germination studies, insect-plant interactions and floral biology that are already under way.A família Solanaceae tem ampla distribuição, principalmente nas áreas tropicais e subtropicais da América do Sul. Solanum L. é um dos mais importantes gêneros desta família com aproximadamente 1.200 espécies. O objetivo deste trabalho foi o de estudar a biologia floral com enfoque na morfologia polínica e no registro de algumas abelhas visitantes de S. stramoniifolium. Dados preliminares indicam a presença de uma espécie de abelha com ferrão e quatro espécies sem ferrão como visitantes de S. stramoniifolium. O pólen de S. stramoniifolium é tricolporado e psilado, ou seja, sem ornamentação. Conclui-se, após o estudo da biologia floral, que S. stramoniifolium constitui fonte potencial de pólen para diferentes espécies de abelhas com e sem ferrão, representando interessante campo para estudos de germinação, interações inseto-planta e biologia floral

Pollen niche of Melipona

Monthly corbicular samples derived from weekly collections of Melipona (Melikerria) interrupta (Apidae: Meliponini) were analyzed alongside a single honey sample between January to December 2012. The botanical families Arecaceae, Melastomataceae and Solanaceae were the most representative in the corbicular load samples, with five temporary specialization events (>90%) being detected for representatives of Melastomataceae and Solanaceae. Furthermore, Melastomataceae also exhibited a greater contribution of pollen types in the honey samples, particularly because of the occurrence of Miconia type (87.17%), followed by Solanaceae, represented by types Solanum stramonifolium (5.00%) and Solanum aculeatissimum (2.50%). The low richness of pollen types in the corbicular pollen samples (n = 16) in this study suggests that M. interrupta may act as a specialist due to the low availability of apiculture resources in terra-firme environments, where intraspecific competition might affect not only the maintenance of these colonies in this environment but also their honey production. © 2017 AASP–The Palynological Society