ANAEROBIC DECOMPOSITION OF REFRACTORY ORGANIC MATTER IN DIFFERENT TROPHIC CONDITIONS

• Grant number: 12/21829-0
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: January 01, 2013
• End date: December 31, 2014
• Field of knowledge: Biological Sciences - Ecology - Ecosystems Ecology
• Principal Investigator: Irineu Bianchini Júnior
• Grantee: Flávia Bottino
• Host Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

This research reports the effects of nutrient concentration (N and P) and carbon in the detritus and in the environment on the anaerobic decomposition of refractory organic matter from two macrophyte species (1 emerged and 1 free-floating). To assess the aims the initial nutrient concentrations will be analyzed in the detritus and in the environment. The refractory detritus will be obtained from the macrophytes leachate and decomposition chambers with the detritus and water from the reservoir where the macrophytes were sampled will be maintained in the dark and in anaerobic conditions (by nitrogen bubbling). N and P will be added to simulate different N:P ratio. In the sampling days (10, 20, 30, 60, 90 and 120) TOC concentration will be analyzed and then the samples will be filtered (0.22 µm) for TOC, NT and TP determinations. This research admits the particulate organic carbon concentration (> 0,22 µm) will correspond to microorganisms biomass. Cellulase and ²-xylanase activities will indicate the heterotrophic efficiency in different N:P conditions. A kinetic model will be adopted to explain the refractory mass decay. Non-parametric variance test will compare the mass decay and enzyme activities among the macrophytes. Linear regressions will evaluate the effect of nutrient concentrations in the mass decay and enzymes activities.

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

BOTTINO, FLAVIA; CUNHA-SANTINO, MARCELA B.; BIANCHINI, JR., IRINEU. Decomposition of Particulate Organic Carbon from Aquatic Macrophytes Under Different Nutrient Conditions. AQUATIC GEOCHEMISTRY, v. 22, n. 1, p. 17-33, JAN 2016. (12/21829-0)

BOTTINO, FLAVIA; CUNHA-SANTINO, MARCELA BIANCHESSI; BIANCHINI, JR., IRINEU. Kinetic aspects of humic substances derived from macrophyte detritus decomposition under different nutrient conditions. Environmental Science and Pollution Research, v. 26, n. 16, p. 15931-15942, JUN 2019. (12/21829-0)

BOTTINO, FLAVIA; VARGAS, SARAH REGINA; POLI MIWA, ADRIANA CRISTINA; CALIJURI, MARIA DO CARMO; BIANCHINI, JR., IRINEU; FERNANDES CUNHA, DAVI GASPARINI. Effects of macrophyte leachate on Anabaena sp and Chlamydomonas moewusii growth in freshwater tropical ecosystems. LIMNOLOGY, v. 19, n. 2, p. 171-176, APR 2018. (12/21829-0)

BOTTINO, FLAVIA; CUNHA-SANTINO, MARCELA BIANCHESSI; BIANCHINI, JR., IRINEU. Cellulase activity and dissolved organic carbon release from lignocellulose macrophyte-derived in four trophic conditions. Brazilian Journal of Microbiology, v. 47, n. 2, p. 352-358, APR-JUN 2016. (12/21829-0)

BOTTINO, F.; SOUZA, B. P.; ROCHA, R. J. S.; CUNHA-SANTINO, M. B.; BIANCHINI JR, I. Characterization of humic substances from five macrophyte species decomposed under different nutrient conditions. LIMNETICA, v. 40, n. 2, p. 267-278, 2021. (12/21829-0)