Rafael Arruda
Universidade Federal de Mato Grosso
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Publication
Featured researches published by Rafael Arruda.
Acta Botanica Brasilica | 2012
Rafael Arruda; Rodrigo Ferreira Fadini; Lucélia Nobre Carvalho; Kleber Del-Claro; Fabiana Alves Mourão; Claudia Maria Jacobi; Grazielle Sales Teodoro; Eduardo van den Berg; Claudenir Simões Caires; Greta Aline Dettke
Ervas-de-passarinho tem sim sido regularmente estudadas em paises temperados por afetar negativamente especies cultivadas e florestas manejadas. Em comparacao com ambientes temperados pouco se conhece sobre a ecologia das ervas-de-passarinho neotropicais. Desta forma, e necessario maior conhecimento sobre o grupo porque sao importantes elementos de comunidades vegetais, atuando como recurso-chave para polinizadores, dispersores de sementes e herbivoros. Atraves de uma combinacao de trabalhos classicos ja publicados com evidencias empiricas recentes, nos apresentamos padroes emergentes da interacao entre ervas-de-passarinho com os organismos associados e questionamentos para estudos adicionais. Existe um crescente interesse neste grupo no Brasil. E embora existam informacoes sobre dispersao de sementes, estudos sobre biologia reprodutiva sao raros e representam um campo a ser explorado. O conhecimento da biologia basica das ervas-de-passarinho sera relevante para modelar sua distribuicao espacial usando uma abordagem metapopulacional ou epidemiologica. Nesta revisao nos sumarizamos os principais estudos conduzidos na regiao Neotropical para fornecer um panorama atual das pesquisas desenvolvidas, bem como novas ideias para futuras investigacoes, especialmente no Brasil.
PLOS ONE | 2013
Grazielle Sales Teodoro; Eduardo van den Berg; Rafael Arruda
Mistletoes are aerial hemiparasitic plants which occupy patches of favorable habitat (host trees) surrounded by unfavorable habitat and may be possibly modeled as a metapopulation. A metapopulation is defined as a subdivided population that persists due to the balance between colonization and extinction in discrete habitat patches. Our aim was to evaluate the dynamics of the mistletoe Psittacanthus robustus and its host Vochysia thyrsoidea in three Brazilian savanna areas using a metapopulation approach. We also evaluated how the differences in terms of fire occurrence affected the dynamic of those populations (two areas burned during the study and one was fire protected). We monitored the populations at six-month intervals. P. robustus population structure and dynamics met the expected criteria for a metapopulation: i) the suitable habitats for the mistletoe occur in discrete patches; (ii) local populations went extinct during the study and (iii) colonization of previously non-occupied patches occurred. The ratio of occupied patches decreased in all areas with time. Local mistletoe populations went extinct due to two different causes: patch extinction in area with no fire and fire killing in the burned areas. In a burned area, the largest decrease of occupied patch ratios occurred due to a fire event that killed the parasites without, however, killing the host trees. The greatest mortality of V. thyrsoidea occurred in the area without fire. In this area, all the dead trees supported mistletoe individuals and no mortality was observed for parasite-free trees. Because P. robustus is a fire sensitive species and V. thyrsoidea is fire tolerant, P. robustus seems to increase host mortality, but its effect is lessened by periodic burning that reduces the parasite loads.
Neotropical Ichthyology | 2013
Lucélia Nobre Carvalho; Luana Fidelis; Rafael Arruda; André Vieira Galuch; Jansen Zuanon
Floating litter banks are an ephemeral habitat consisting of branches, twigs, flowers, seeds, and fruits that are trapped on the stream water surface by a variety of retention mechanisms. These heterogeneous materials form a deep layer of dead plant matter that is colonized by a variety of organisms, including fish that forage on the aquatic macroinvertebrates found in this unique habitat. In this study, we aimed to characterize which fish species occupy the floating litter banks and their trophic characteristics, as well as determine if fish assemblage composition and species richness can be predicted by the size of the floating litter banks. Fish sampling was conducted in five rivers located in the Amazon basin. Of the 31 floating litter banks sampled that contained fish, 455 individuals were recorded and were distributed within 40 species, 15 families and five orders. Siluriformes were the most representative order among the samples and contained the largest number of families and species. The fish fauna sampled was mainly composed of carnivorous species that are typically found in submerged litter banks of Amazonian streams. The fish assemblage composition in the kinon can be predicted by the volume of the floating litter banks using both presence/absence and abundance data, but not its species richness. In conclusion, kinon banks harbor a rich fish assemblage that utilizes this habitat for shelter and feeding, and may function as a refuge for the fishes during the peak of the flooding season.
Wetlands | 2015
Francielli Bao; Marco Antonio Assis; Rafael Arruda; Arnildo Pott
Studies on species invasion in wetlands are fundamental to understanding the consequences of the introduction of exotic plants, which are often utilized in grasslands. The loss of native plant diversity is of increasing concern. We evaluated the effect of Urochloa humidicola on floristic similarity between native and cultivated grasslands and the differences in spatial distributions between species. To analyze the effect of seasonality, we collected samples at the end of flood and dry periods. In native grasslands and another area cultivated with U. humidicola, samples were collected at three elevations (bottom; intermediate; and top). We identified 90 species and observed a high similarity between the cultivated and native grassland during the flood period; both grasslands exhibited significant differences during the drought period. This difference was due to an increased presence of grasses, mainly U. humidicola, in the cultivated grassland. Increased similarity between bottom and intermediate elevations was due to an increased proportion of aquatic macrophytes. In contrast, the top elevation differed due to the contribution of terrestrial species. We conclude that the native and cultivated grasslands exhibit differences in vegetation composition and are primarily structured by seasonal flooding, and small variations in elevation promote zonation within the plant community.
Anais Da Academia Brasileira De Ciencias | 2017
Francielli Bao; Thales D. Leandro; Maíra da Rocha; Vanessa Samúdio dos Santos; Thiago Henrique Stefanello; Rafael Arruda; Arnildo Pott; Geraldo Alves Damasceno-Junior
The Brazilian Pantanal is an extensive wetland with heterogeneous habitats, primarily due to the river-floodplain system and plants with differential adaptations and reproductive strategies. Factors such as altitude, distance among plant formations, and flood pulse must be considered to better understand its diversity. Aiming to assess the influence of biogeographic patterns in this system, we analyzed the floristic composition of six areas along the Paraguay River, including residual relieves, verifying the pattern of similarity, and effects of distance and altitude. We recorded 356 species in 87 families, mostly perennial (75%), and some annuals (15%) and pluriannuals (5%). Herbaceous plants were the most represented (48%), followed by arboreal (23%), shrubby (15%) and epiphytic (14%) habits, only 12% being endemic to Brazil. The studied areas showed low floristic similarity, but higher resemblance of species between neighboring areas, and no relation with altitude. The upper Paraguay River is diverse, with high spatial variability of species, predominantly perennial. The river-floodplain connectivity may be a determinant factor in species richness and occurrence of endemic species.
Check List | 2012
Márcia Cléia Vilela-Santos; Luciane F. Barbosa; Natalie A. Coutinho; Marcelo Henrique Ongaro Pinheiro; Domingos de Jesus Rodrigues; Larissa Cavalheiro; Rafael Arruda; Everton José Almeida; Robyn J. Burnham
We found six species of the genus Gurania that are described here as new records for the state of Mato Grosso, Central Brazil. The species of Gurania recorded here occur in the north of Mato Grosso state, Brazil in the biome recognized as “ Floresta Amazonica ”. This is an area of southern Amazonia that has been poorly inventoried. We carried out the surveys in permanent plots using the RAPELD-PPBio system and along trails giving access to the permanent plots.
Brazilian Journal of Botany | 2014
Francielli Bao; Arnildo Pott; Fernando Alves Ferreira; Rafael Arruda
Biotropica | 2012
João Alves de Lima Filho; Jhany Martins; Rafael Arruda; Lucélia Nobre Carvalho
Acta Botanica Brasilica | 2015
Marcelo Henrique Ongaro Pinheiro; Lucélia Nobre Carvalho; Rafael Arruda; Frederico Augusto Guimarães Guilherme
Acta Botanica Brasilica | 2013
Rafael Arruda; Caroline Lunardelli; Clóvis Kitagawa; Claudenir Simões Caires; Grazielle Sales Teodoro; Fabiana Alves Mourão