20 research outputs found
The Habitat Affects the Ecological Interactions between Azteca Forel (Hymenoptera: Formicidae) and Cecropia Loefl. (Urticaceae Juss.)
In order to understand the effects of human impacts on structure and functioning of tropical forests, we should consider studies on animal-plant interactions such as antplant mutualistic interactions.We investigated the mutualistic interactions between ants (Azteca genera) and Cecropia plants in habitats of secondary forest and pasture used as cattle fields. We tested for the following hyphothesis: (i) Cecropia from pasture are more susceptible to foliar herbivory than the Cecropia from the forest, and (ii) the defense promoted by ants of Azteca genus is less efficient in the pasture when compared to the forested areas. We selected four areas inserted in Atlantic rain forest domain surrounded by secondary forest and by cattle pastures. The herbivory was more intense in the pasture than in the secondary forest. The presence of Azteca species diminished foliar herbivory only in the forested areas, where we observed a significant increase in herbivory after the removal of A. alfari colony. We argue that the greater herbivory in pasture occurs probably due the lack of other plant resource, being Cecropia paschystachya Trécul and C. glaziovii Snethl., isolated in a “sea of grass” without connection with other tree vegetation, opposite scenario observed in forested habitats. The defense of Azteca only in the secondary forest, leading us to suppose that: 1) not even the your aggressive behavior is able to reduce the intense herbivory in the pasture; 2) the your behavioral pattern in forest is not the same in deforested environments and / or 3) mutualism may be undergoing changes due to abiotic effects on pasture
Gimnospermas no Parque Ibirapuera, SĂŁo Paulo, SP, Brasil
As Gimnospermas incluem as plantas vasculares com sementes nĂŁo inseridas no interior de frutos. Recentes estudos moleculares corroboram para a monofilia das Gimnospermas atuais. Constituem um grupo de espĂ©cies amplamente utilizadas para fins econĂ´micos e ornamentais. Contudo, há poucos estudos sobre esse grupo no Brasil. No presente estudo foi realizado o levantamento das espĂ©cies e contagem de espĂ©cimes ocorrentes no Parque Ibirapuera, SĂŁo Paulo, SP, Brasil. Foi elaborada uma chave dicotĂ´mica de identificação para as espĂ©cies do Parque e descrição para cada uma das espĂ©cies. Foram encontradas 20 espĂ©cies de Gimnospermas, pertencendo a 13 gĂŞneros, em cinco famĂlias. Registraram‑se 352 indivĂduos distribuĂdos por 35 setores do Parque. O Parque Ibirapuera apresentou o maior nĂşmero de espĂ©cies de Gimnospermas, em comparação com outros levantamentos realizados no municĂpio, alĂ©m de apresentar seis espĂ©cies como primeira ocorrĂŞncia registrada, demonstrando a importância deste local para a conservação
FIGURE 5. Morphological differences between C. alnifolia, C. chichape, C in Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia
FIGURE 5. Morphological differences between C. alnifolia, C. chichape, C. flumeniana, and C. iguanaea.—A: C. alnifolia, trunk.; B: C. chichape, trunk.; C: C. flumeniana, trunk.; D: C. iguanaea, trunk.; E: C. alnifolia, staminate flower.; F: C. chichape, staminate flower.; G: C. flumeniana, staminate flower.; H: C. iguanaea, staminate flower.; I: C. alnifolia, pistillate flower.; J: C. chichape, pistillate flower.; K: C. flumeniana, pistillate flower.; L: C. iguanaea, pistillate flower.; M: C. alnifolia, mature drupe.; N: C. chichape, mature drupe.; O: C. flumeniana, mature drupe.; P: C. iguanaea, mature drupe.; Q: C. alnifolia, pyrene.; Q1: C. alnifolia, arrow pointing to the apiculum scar.; R: C. chichape, pyrene.; S: C. flumeniana, pyrene.; S1: C. flumeniana, arrow pointing to the apiculum scar.; T: C. iguanaea, pyrene. T1: C. iguanaea, arrow pointing to the apiculum scar.Published as part of <i>Zamengo, Henrique Borges, Gaglioti, André Luiz & Pederneiras, Leandro Cardoso, 2023, Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia, pp. 251-263 in Phytotaxa 620 (4)</i> on page 258, DOI: 10.11646/phytotaxa.620.4.1, <a href="http://zenodo.org/record/10080550">http://zenodo.org/record/10080550</a>
FIGURE 1 in Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia
FIGURE 1. Main characteristics of Celtis flumeniana Zamengo.—A. Habit. B. Trunk. C. Leaf, abaxial surface. D. Domatia. E. Cyme. F. Staminate flower. G. Pistillate flower. H. Immature drupes. I. Mature drupe. J. Pyrenes. J1. Monoapiculate pyrene. J2. Biapiculate pyrene.Published as part of <i>Zamengo, Henrique Borges, Gaglioti, André Luiz & Pederneiras, Leandro Cardoso, 2023, Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia, pp. 251-263 in Phytotaxa 620 (4)</i> on page 254, DOI: 10.11646/phytotaxa.620.4.1, <a href="http://zenodo.org/record/10080550">http://zenodo.org/record/10080550</a>
FIGURE 3 in Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia
FIGURE 3. Holotype of Celtis flumeniana Zamengo.Published as part of <i>Zamengo, Henrique Borges, Gaglioti, André Luiz & Pederneiras, Leandro Cardoso, 2023, Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia, pp. 251-263 in Phytotaxa 620 (4)</i> on page 256, DOI: 10.11646/phytotaxa.620.4.1, <a href="http://zenodo.org/record/10080550">http://zenodo.org/record/10080550</a>
FIGURE 2 in Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia
FIGURE 2. Illustration of Celtis flumeniana Zamengo.—A. Fruit branch. B. Adult leaf. C. Domatia. E. Staminate flower. F. Pistillate flower. G. Drupe. H. Pyrene. Illustrator Klei Sousa.Published as part of <i>Zamengo, Henrique Borges, Gaglioti, André Luiz & Pederneiras, Leandro Cardoso, 2023, Celtis flumeniana (Cannabaceae): a new species from Brazil and reestablishment of Celtis alnifolia, pp. 251-263 in Phytotaxa 620 (4)</i> on page 255, DOI: 10.11646/phytotaxa.620.4.1, <a href="http://zenodo.org/record/10080550">http://zenodo.org/record/10080550</a>
Flora das cangas da Serra dos Carajás, Pará, Brasil: Moraceae
Resumo Este trabalho compreende um tratamento para Moraceae nas cangas da Serra dos Carajás, no estado do Pará. São apresentados descrição, fotografia e comentário para Ficus americana subsp. guianensis, a única espécie registrada na área de cangas
Nomenclatural revision of the names of Celtis (Cannabaceae) described for Africa, and lectotypification of one Asian name
ZAMENGO, HENRIQUE BORGES, CHAMORRO, DEBORA, GAGLIOTI, ANDRÉ LUIZ, PEDERNEIRAS, LEANDRO CARDOSO (2023): Nomenclatural revision of the names of Celtis (Cannabaceae) described for Africa, and lectotypification of one Asian name. Phytotaxa 607 (2): 160-160, DOI: 10.11646/phytotaxa.607.2.5, URL: http://dx.doi.org/10.11646/phytotaxa.607.2.
Flora das cangas da Serra dos Carajás, Pará, Brasil: Urticaceae
Resumo Este estudo engloba as espécies de Urticaceae registradas nas vegetações de cangas da Serra dos Carajás, Pará, trazendo descrições detalhadas, ilustrações e comentários morfológicos das espécies. Foram encontrados cinco gêneros e sete espécies de Urticaceae para a área de estudo
Urticaceae Juss. do Parque Estadual das Fontes do Ipiranga, SĂŁo Paulo, SP, Brasil
Urticaceae está representada por sete gĂŞneros e 14 espĂ©cies na área do Parque. Destas, 11 sĂŁo nativas e trĂŞs cultivadas (Pilea cadierei Gagnep. & Guillaumin, Pilea nummulariifolia (Sw.) Wedd. e Boehmeria nivea Jacq.). Foram incluĂdos os gĂŞneros Cecropia com trĂŞs espĂ©cies e Coussapoa com uma espĂ©cie