Padrão temporal de herbivoria e defesas antiherbivoria em população natural de Laguncularia racemosa (Combretaceae) em manguezal predado maciçamente por Hyblaea puera (Lepidoptera)
| Autor: | Barbara Schminsky de França, Bruno Francisco Sant'Anna-Santos, João Carlos Ferreira Melo Júnior |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Atmospheric Science
Combretaceae biology Nutritional content Geography Planning and Development Perforation (oil well) Laguncularia racemosa Mechanical resistance biology.organism_classification Saturation index Horticulture Hyblaea puera Geophysics Computers in Earth Sciences Earth-Surface Processes General Environmental Science |
| Zdroj: | Revista Brasileira de Geografia Física. 13:3151 |
| ISSN: | 1984-2295 |
| DOI: | 10.26848/rbgf.v13.07.p3151-3158 |
| Popis: | Interacoes entre plantas e animais resultam em uma ampla variedade de adaptacoes nos individuos. Os herbivoros normalmente escolhem as plantas segundo o seu conteudo nutricional, sendo assim, as alteracoes na anatomia foliar, bem como na sua composicao quimica afetam diretamente os herbivoros. O objetivo deste trabalho foi investigar, em perspectiva temporal, se houve alteracoes estruturais e/ou quimicas nas folhas de Laguncularia racemosa em resposta ao desfolhamento macico de um bosque de manguezal causado pelo herbivoro exotico Hyblaea puera. Foram selecionados 10 individuos, dos quais foram coletadas, em intervalo de um ano, 25 folhas totalmente expandidas e fixadas nos 3° e 4° nos para a analise de atributos morfoanatomicos e histoquimica. Analise quimica do solo foi realizada em triplicata. Os dados foram avaliados estatisticamente por meio do teste t de Student e PCA em ambiente R. A PCA do solo evidenciou a diminuicao na salinidade inversamente relacionada com o aumento do indice de saturacao do Aluminio (H. AL) e da capacidade de troca cationica do solo (CTC). A PCA mostrou que os tres primeiros componentes explicaram 58,15% da variância total de dados analisados, sendo estes respectivamente a massa fresca, area herbivorada e espessura do limbo. Isso foi acompanhado pelo aumento da massa seca foliar, gerando maior resistencia a perfuracao do limbo, o que resultou na reducao de 92,40% da area foliar atacada pela herbivoria. Os testes histoquimicos evidenciaram alteracao na producao de composto metabolitos, com diminuicao na producao de taninos nos tecidos vasculares, o que possivelmente se justifica pela maior resistencia mecânica das folhas. Conclui-se que a herbivoria macica em L. racemosa foi preditora de ajustes ligados a defesa antiherbivoria de forma a reduzir o impacto negativo em outro evento predatorio de sua copa. Temporal pattern of herbivory and anti-hereditary fenders in the natural population of Laguncularia racemosa (Combretaceae) in mangroves massively predated by exotic herbivore of the species Hyblaea puera (Lepidoptera) A B S T R A C T Interactions between plants and animals result in a wide variety of adaptations in individuals. Herbivores typically choose plants according to their nutritional content, so changes in leaf anatomy as well as chemical composition directly affect herbivores. The aim of this work was to investigate, in a temporal perspective, if there were structural and / or chemical alterations in the leaves of Laguncularia racemosa in response to the massive defoliation of a mangrove forest caused by the exotic herbivore Hyblaea puera . Ten individuals were selected, from which 25 fully expanded and fixed at the 3rd and 4th nodes leaves were collected, in a one year interval, for the analysis of morphoanatomic and histochemical attributes. Soil chemical analysis was performed in triplicate. Data were statistically evaluated by Student's t-test and PCA in R environment. Soil PCA showed a decrease in salinity inversely related to an increase in Aluminum saturation index (H. AL) and soil cation exchange capacity (CTC). The PCA showed that the first three components accounted for 58.15% of the total variance of analyzed data, which were fresh mass, herbivorous area and limb thickness respectively. This was accompanied by an increase in leaf dry mass, leading to greater resistance to limb perforation, which resulted in a reduction of 92.40% of the leaf area attacked by herbivory. The histochemical tests showed alteration in the production of compound metabolites, with decrease in the production of tannins in the vascular tissues, which possibly is justified by the greater mechanical resistance of the leaves. It was concluded that the massive herbivory in L. racemosa was a predictor of adjustments related to the antiherbivory defense in order to reduce the negative impact on another predatory event of its crown. Key-words: functional adjustments, histochemistry; plant-herbivorous interactions; white mangrove. |
| Databáze: | OpenAIRE |
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