DINÂMICA NUTRICIONAL DOS DETRITOS VEGETAIS ALÓCTONES EM UMA MATA RIPÁRIA SUBTROPICAL
DOI:
https://doi.org/10.4257/oeco.2020.2403.06Keywords:
temporal variation, nutritional content, plant input, subtropical streamAbstract
O presente estudo avaliou as mudanças temporais no aporte de carbono, nitrogênio e fósforo presente nos detritos foliares alóctones em uma mata ripária subtropical, correlacionando os índices de precipitação e temperatura do ar. As hipóteses formuladas para este trabalho foram: (1) os dez táxons mais abundantes no local terão maior importância ecológica para o sistema aquático contribuindo nutricionalmente de forma mais representativa, entretanto, essa contribuição e importância podem se alterar temporalmente; (2) quanto menor a temperatura e maior o índice de precipitação, maiores serão as concentrações de nutrientes nos detritos foliares. Os procedimentos de coletas foram realizados mensalmente, durante dois anos, no riacho Cachoeira Grande, de Floresta Ombrófila Densa preservada, localizado em Florianópolis/SC. Foram demarcados em campo cinco pontos de coleta onde foram instalados os coletores verticais, laterais e terrestres. Os detritos vegetais coletados foram levados para o laboratório, secos em estufa, identificados, triados, pesados e triturados para as análises químicas. Os resultados deste trabalho mostraram que, conforme a hipótese 1, alguns táxons, como por exemplo Tetrorchidium rubrivenium e Sebastiania sp., apresentaram importância ecológica variável ao longo do tempo. Enquanto alguns detritos foliares continham concentrações nutricionais menores, outros táxons continham os nutrientes em maior quantidade. Mas, contrariando a hipótese 2, os índices de precipitação e as variações de temperatura não proporcionaram maiores entradas de nutrientes no sistema aquático, sugerindo-se que essas concentrações sejam influenciadas por outros fatores. Apesar das principais espécies do sistema apresentarem razões estequiométricas foliares diferentes, não houve período observado de carência no aporte de nutrientes, que, diferentemente a observações da literatura, não sofreram influência de variações na temperatura ou precipitação.
NUTRITIONAL DYNAMICS OF ALLOCHTHONOUS VEGETAL DEBRIS IN A SUBTROPICAL RIPARIAN FOREST: This study evaluated the temporal changes of carbon, nitrogen and phosphorus leaf litter content in the allochthonous input of a subtropical riparian forest, making correlations with precipitation and air temperature. We formulated the following hypotheses: (1) the 10 most abundant taxa will have greater ecological importance to the aquatic system by contributing nutritionally more, and this contribution can vary temporarily; (2) lower temperatures and higher the precipitations rates will increase the nutrition content of leaf litter. Samples were performed monthly during two years, in the Cachoeira Grande stream, located in a preserved Atlantic Rainforest segment in Florianopolis city, SC, Brazil. Five sample points were chosen to install vertical and terrestrial samplers. Leaf litter sampled was taken to laboratory, dried in oven, identified, weighted and triturated for chemical analyses. Results demonstrated that, as hypothesis 1 suggested, some taxa (e.g. Tetrorchidium rubrivenium and Sebastiania sp.) presented temporal variation in the ecological importance for the system. While some taxa showed lower nutritional content, others presented higher nutrient concentrations. However, against hypothesis 2, precipitation index and temperature variations were not correlated with higher nutrient input to the aquatic system, suggesting that this dynamic is influenced by other factors. Despite different stoichiometric values of the leaves, it was not observed a shortage period of nutrients input to the system. Differently to the observed literature, the nutrient content of the leaves did not suffer influence of temperature or precipitation variations.
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