Palinologia do componente herbáceo na atmosfera de Caxias do Sul, RS, Brasil

Vergamini, Sandra Maria; Valencia-Barrera, Rosa María; Sbersi, Francieli; Maffazzioli, Taísa Fedrizzi

doi:10.1590/s0102-33062006000400017

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…There were 61 pollen types that could not be identified, because the grains were crushed, deformed, or in positions unfavorable to the observation of important exine characters. Such situations are commonly reported in palynological studies (Salgado-Labouriau 1973;Ávila & Bauermann 2001;Vergamini et al 2006).…”

Section: Resultsmentioning

confidence: 69%

First records of pollen rain in bromeliad tanks in an area of caatinga in northeastern Brazil

et al. 2014

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Species of Bromeliaceae have leaves in a spiral configuration. Because of the shape of the rosette thus formed and the imbricate configuration of the leaf sheaths, there is usually a tank in which rainwater and other components of the environment, including pollen grains, accumulate, making such tanks effective pollen rain collectors. The objective of this study was to use bromeliads as a tool to increase knowledge about the vegetation of the caatinga (shrublands) in the Canudos region of the state of Bahia, located in the semi-arid zone of Brazil, as well as to analyze the dynamics of pollen dispersal and deposition. To that end, we collected samples of the water from the tanks of bromeliads at the Canudos Biological Station. A total of 149 pollen types were detected, 88 of which could be identified botanically. The families that were the most well-represented among the pollen types were Fabaceae (with 25), Asteraceae (with 9), and Euphorbiaceae (with 7). Ten pollen types were presented as potential indicators of caatinga vegetation. We conclude that tank bromeliads are useful for gathering information about pollen rain and pollen dynamics, as well as about the transport and deposition of pollen in the caatinga.

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Section: Resultsmentioning

confidence: 69%

First records of pollen rain in bromeliad tanks in an area of caatinga in northeastern Brazil

et al. 2014

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“…Four studies were performed in Rio Grande do Sul State, which is dominated by Campos Sulinos. However, three of the studies were conducted in urban areas with high levels of human disturbance (Bauermann et al 1998;Bauermann & Neves 1999;Ávila & Bauermann 2001), and the other restricted the analysis to pollen types of herbaceous plants (Vergamini et al 2006). Because these studies did not reflect the natural aspects of vegetation, the results were not considered for comparison in this study.…”

Section: Discussionmentioning

confidence: 99%

First report of modern pollen deposition in moss polsters in a semiarid area of Bahia, Brazil

et al. 2015

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Recent studies have shown that pollen analyses of natural substrates can produce data valuable for understanding the local pollen productivity and dispersal, deposition, and preservation potential of pollen grains. In this study, we aimed to acquire novel information about the dynamics and preservation of pollen in Caatinga environment through the palynological study of moss polsters. Samples of moss polsters in soil (MPS) and on rock (MPR) were collected from the Canudos Biological Station in the Bahia State (Brazil) and subjected to standard chemical treatments for the extraction of pollen residues. In total, 372 pollen types were recorded from the samples of which the taxonomical affinity of 140 was determined. The most represented families were Fabaceae (23 pollen types/16.42%) and Asteraceae (12 pollen types/8.57%). The MPS samples had a higher pollen concentration (21,042.04 pollen grains/cm²) than the MPR samples (7,829.35 pollen grains/cm²). On the other hand, the MPR samples had a greater diversity (68.26% of the identified pollen types). Qualitative analysis showed that the plants of shrub and subshrub habits had the greatest representation among the pollen types (35.0%). Overall, moss polsters proved to be excellent natural air pollen collectors in Caatinga environment, provided they had moist microhabitats for their development.

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“…Espécies da família Poaceae são consideradas anemófilas por apresentarem grãos de pólen com superfície psilada e serem encontrados dispersos em abundância na atmosfera (AVILA; BAUERMANN, 2001;VERGAMINI et al, 2006a;2006b), assim como por sua morfologia loral ser apropriada para a anemoilia Produção polínica de Bromus catharticus e Guadua trinii (Poaceae) para dados fósseis PIJL, 1979;GUILHERME;RESSEL, 2001). Muitas espécies dessa família estão envolvidas com doenças respiratórias devido à grande concentração de seus grãos de pólen considerados alergógenos no ambiente (FUCHS, 2007), podendo os grãos de pólen de gramíneas permanecerem lutuando por um período de 24h (PEEL et al, 2014).…”

Section: Grãos De Pólen De Gramíneas Dominam Os Registros Polínicos Funclassified

Avaliação da produção polínica de Bromus catharticus Vahl e Guadua trinii (Nees) Nees ex Rupr. (Poaceae) para a interpretação de dados fósseis

Radaeski

Bauermann

2016

Biotemas

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ResumoNeste trabalho é apresentada a produção polínica por antera, por lor e por espigueta das espécies Bromus catharicus (campestre) e Guadua trinii (lorestal), ambas da família Poaceae, que apresentam a síndrome da polinização divergente. Com o objetivo de averiguar diferenças de produção polínica dependente do sistema de polinização, foram coletadas dez anteras de cada táxon que após maceradas foram contabilizados os grãos de pólen em câmara de Neubauer. As morfologias polínicas também foram observadas sob microscopia óptica para estabelecer relação entre produção-morfologia dos grãos de pólen. A espécie anemóila Bromus catharticus (2.556.000 grãos de pólen por espigueta) apresenta o dobro de produção polínica por antera e por espigueta em relação à espécie com assistência biótica para polinização Guadua trinii (1.716.000 grãos de pólen por espigueta). O tamanho do grão de pólen é inversamente proporcional à produção polínica. A ornamentação microequinada não esperada para espécies anemóilas foi observada nos dois táxons. Os resultados indicam que a frequência de espécies lorestais de Poaceae em registros quaternários pode ser subestimada, enquanto táxons campestres de gramíneas são superestimados, interferindo na representação de suas respectivas loras no passado. Palavras-chave: Dinâmica de transporte polínico; Gramíneas; Tafonomia polínica AbstractEvaluation of pollen production in Bromus catharticus Vahl and Guadua trinii (Nees) Nees ex Rupr. (Poaceae) for interpretation of fossil data. We evaluated pollen production per anther, per lower, and per spikelet of the grassland species Bromus catharticus and the forest taxon Guadua trinii (Poaceae), which have divergent pollination syndrome. We collected ten anthers of each taxon to determine differences in pollen production based on pollination system. Anthers were macerated and pollen grains were counted in a Neubauer chamber. Pollen morphology was observed using optical and scanning electron microscopy to establish relationships between pollen grain production and morphology. The anemophilous species Bromus catharticus (2,556,000 pollen grains/spikelet) has twice the pollen production per anther and per spikelet compared to Guadua trinii (1,716,000 pollen grains/spikelet), a species that requires biotic assistance for pollination. Pollen grain size is inversely proportional to production. Microechinate ornamentation, which is not expected to

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Palinologia do componente herbáceo na atmosfera de Caxias do Sul, RS, Brasil

Cited by 4 publications

References 6 publications

First records of pollen rain in bromeliad tanks in an area of caatinga in northeastern Brazil

First records of pollen rain in bromeliad tanks in an area of caatinga in northeastern Brazil

First report of modern pollen deposition in moss polsters in a semiarid area of Bahia, Brazil

Avaliação da produção polínica de Bromus catharticus Vahl e Guadua trinii (Nees) Nees ex Rupr. (Poaceae) para a interpretação de dados fósseis

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