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Experimental ecological studies on stream macroalgae: effects of habitat complexity, hydraulic conditions and physical disturbances and the presence of herbicides on the establishment and development of these organisms

Grant number: 14/22952-6
Support type:Regular Research Grants
Duration: March 01, 2015 - February 28, 2017
Field of knowledge:Biological Sciences - Botany
Principal Investigator:Ciro Cesar Zanini Branco
Grantee:Ciro Cesar Zanini Branco
Home Institution: Faculdade de Ciências e Letras (FCL-ASSIS). Universidade Estadual Paulista (UNESP). Campus de Assis. Assis , SP, Brazil
Assoc. researchers:Aurélio Fajar Tonetto ; Pitágoras da Conceição Bispo ; Ricardo Cardoso Leite


Despite several observational studies have produced important contributions to knowledge of stream macroalgal ecology, gaps still remain about the relationship of the environment and ecological distribution patterns of these organisms. As an alternative to improve the understanding of the ecology of these algae, experimental investigations began to be conducted in Brazil. Exactly in experimental ecology of tropical stream macroalgae that this research intends to make its main contributions. In this context, two experimental studies are being proposed in order to assess (1) the influences of substrate complexity, hydraulic conditions and physical disturbances and (2) the effects of anthropogenic substances on the establishment and development of stream macroalgae. In the first study, experiments will be carried out simulating the occurrence of physical disturbances on artificial substrates with five different levels of structural complexity and specific hydraulic conditions. The effects of these variables will be assessed considering as response variables richness (number of species) and abundance (percent cover and chlorophyll a content) of macroalgae. In the second study, experiments will be conducted in the laboratory aiming evaluate the effects of different concentrations of glyphosate herbicides on photosynthetic responses of macroalgal species belonging to the phyla Cyanobacteria, Chlorophyta and Rhodophyta. Photosynthetic responses will be evaluated by two techniques: (i) chlorophyll fluorescence and (ii) dissolved oxygen evolution. The research team involved in this proposal is qualified and has previous experience. The expected outcomes of this research include the production of scientific articles, monographs and thesis, the formation of highly qualified human resources and the consolidation of this research line in our research group. (AU)

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)
VILAS BOAS, LUCAS K.; OLIVEIRA, REGIS DE C.; NECCHI, ORLANDO; BRANCO, CIRO C. Z. Temperature effects on photosynthesis in gametophytic and sporophytic stages of the freshwater red alga Sirodotia delicatula (Rhodophyta, Batrachospermales) under a global warming perspective. PHYCOLOGICAL RESEARCH, v. 67, n. 1, p. 39-44, JAN 2019. Web of Science Citations: 0.
BRANCO, CIRO C. Z.; RIOLFI, THAIS A.; CRULHAS, BRUNO P.; TONETTO, AURELIO F.; BAUTISTA, ANNA I. N.; NECCHI JUNIOR, ORLANDO. Tropical lotic primary producers: Who has the most efficient photosynthesis in low-order stream ecosystems?. Freshwater Biology, v. 62, n. 9, p. 1623-1636, SEP 2017. Web of Science Citations: 1.
ROCHA, JOSE CELSO; PERES, CLETO K.; BUZZO, JOSE LEONEL L.; DE SOUZA, VINICIUS; KRAUSE, ERIC A.; BISPO, PITAGORAS C.; FREI, FERNANDO; COSTA, LUCAS S. M.; BRANCO, CIRO C. Z. Modeling the species richness and abundance of lotic macroalgae based on habitat characteristics by artificial neural networks: a potentially useful tool for stream biomonitoring programs. JOURNAL OF APPLIED PHYCOLOGY, v. 29, n. 4, p. 2145-2153, AUG 2017. Web of Science Citations: 1.
TONETTO, AURELIO FAJAR; BISPO, PITAGORAS CONCEICAO; ZANINI BRANCO, CIRO CESAR. Diversity Assessment of Lotic Macroalgal Flora by the Application of Taxonomic Distinctness Index. Biota Neotropica, v. 16, n. 1 JAN-MAR 2016. Web of Science Citations: 0.
OLIVEIRA, REGIS DE CAMPOS; VILAS BOAS, LUCAS KORTZ; ZANINI BRANCO, CIRO CESAR. Assessment of the potential toxicity of glyphosate-based herbicides on the photosynthesis of Nitella microcarpa var. wrightii (Charophyceae). PHYCOLOGIA, v. 55, n. 5, p. 577-584, 2016. Web of Science Citations: 6.

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