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      Plantas trepadeiras em afloramentos rochosos no nordeste do Brasil: padrões de riqueza, similaridade florística e síndromes de dispersão Translated title: Climbing plants in rocky outcrops in Northeast Brazil: patterns of richness, floristic similarity and dispersion syndromes

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          Abstract

          Resumo Afloramentos rochosos são relevos residuais montanhosos que ocorrem em regiões tropicais, subtropicais e temperadas de todo o mundo. Nesse trabalho, nossos objetivos foram entender os padrões de riqueza e similaridade florística de plantas trepadeiras em afloramentos rochosos no nordeste do Brasil, bem como, compreender aspectos morfológicos e formas de dispersão dessas espécies. As análises foram realizadas utilizando uma lista florística de plantas trepadeiras registradas em inventários de afloramentos rochosos, nos estados da Paraíba e Pernambuco. Foram identificadas 143 espécies, 66 gêneros e 25 famílias. Quanto ao aspecto morfológico, 72% das espécies são trepadeiras herbáceas e 28% são lenhosas (lianas). O mecanismo de ascensão mais frequente foi o volúvel (66%) e a síndrome de dispersão mais representativa foi autocoria (44%). A riqueza de trepadeiras herbáceas e lenhosas foi positivamente correlacionada com a altitude e negativamente correlacionada com a distância do litoral e a temperatura; correlação negativa também foi observada entre a riqueza de trepadeiras herbáceas e a precipitação, enquanto para as lenhosas a riqueza se manteve constante nessa variável. A análise de similaridade florística resultou na formação de três grupos, sugerindo uma composição florística característica da matriz circundante, influenciada por fatores abióticos e tipos vegetacionais onde os afloramentos rochosos estão inseridos.

          Translated abstract

          Abstract Rocky outcrops are residual reliefs mountainous that occur in tropical, subtropical and temperate regions from all over the world. In this work, our objectives were to understand the richness patterns and floristic similarity of climbing plants, in rocky outcrops in Northeast Brazil, as well as to understand morphological aspects and dispersion forms of these species. The analyzes were carried out using a floristic list of climbing plants recorded in inventories of rocky outcrops, in the states of Paraíba and Pernambuco. We identified 143 species, 66 genera and 25 families. As for the morphological aspect, 72% of the species are herbaceous climbers and 28% are woody climbers (lianas). The most frequent ascending mechanism was the voluble (66%), and the most representative dispersion syndrome was autochory (44%). The richness of herbaceous and woody climbers was positively correlated with altitude, and negatively correlated with distance from the coast and temperature; negative correlation was also observed between richness of herbaceous climbers and precipitation, while for the woody the richness remained constant for this variable. The analysis of floristic similarity resulted in the formation of three groups, suggesting a floristic composition characteristic of the surrounding matrix, influenced by abiotic factors and vegetation types where rock outcrops are inserted.

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          WorldClim 2: new 1-km spatial resolution climate surfaces for global land areas

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            Biostatistical Analysis

            Presents a broad collection of data analysis techniques suitable for biological investigations, either as an introductory textbook assuming no prior knowledge of statistics, or as a reference on concepts and procedures of statistical analysis for professional use in the biological disciplines. Each
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              A mechanistic explanation for global patterns of liana abundance and distribution.

              One of the main goals in ecology is determining the mechanisms that control the abundance and distribution of organisms. Using data from 69 tropical forests worldwide, I demonstrate that liana (woody vine) abundance is correlated negatively with mean annual precipitation and positively with seasonality, a pattern precisely the opposite of most other plant types. I propose a general mechanistic hypothesis integrating both ecological and ecophysiological approaches to explain this pattern. Specifically, the deep root and efficient vascular systems of lianas enable them to suffer less water stress during seasonal droughts while many competitors are dormant, giving lianas a competitive advantage during the dry season. Testing this hypothesis in central Panama, I found that lianas grew approximately seven times more in height than did trees during the dry season but only twice as much during the wet season. Over time, this dry season advantage may allow lianas to increase in abundance in seasonal forests. In aseasonal wet forests, however, lianas gain no such advantage because competing plants are rarely limited by water. I extend this theory to account for the local, within-forest increase in liana abundance in response to disturbance as well as the conspicuous decrease in liana abundance at high latitudes.
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                Author and article information

                Journal
                rod
                Rodriguésia
                Rodriguésia
                Instituto de Pesquisas Jardim Botânico do Rio de Janeiro (Rio de Janeiro, RJ, Brazil )
                0370-6583
                2175-7860
                2020
                : 71
                : e02402018
                Affiliations
                [1] Recife PE orgnameUniversidade Federal de Pernambuco - UFPE orgdiv1Centro de Biociências Brasil
                [2] Fortaleza Ceará orgnameUniversidade Federal do Ceará orgdiv1Centro de Ciências orgdiv2Depto. Biologia Brazil
                Article
                S2175-78602020000100304 S2175-7860(20)07100000304
                10.1590/2175-7860202071145
                8c181eab-3589-481a-9090-e6e73318266a

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 21 August 2018
                : 17 September 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 78, Pages: 0
                Product

                SciELO Brazil

                Categories
                Artigos Originais

                mechanisms of ascension,fatores abióticos,dispersion,inselbergues,flora,mecanismos de ascensão,abiotic factors,dispersão

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