Banca de QUALIFICAÇÃO: JADNA NAYARA DE SOUZA BEZERRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JADNA NAYARA DE SOUZA BEZERRA
DATE: 15/02/2022
TIME: 09:00
LOCAL: Google Meet
TITLE:

Evaluation of the performance of macroalga Gracilaria domingensis under different sources of nutrients within a nutritional context

KEY WORDS:

cultivation; nutrient pulse; biomass; growth

PAGES: 41
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

As macroalgae are important natural resources of the oceans. In addition to their importance as an in natura food, they are also used in the production of animal feed, fertilizers and hydrocolloid and bioactive sources. Many algae have the ability to use excess nutrients as fertilizer for their growth. Because of this ability, the use of nutrient pulses in the cultivation of macroalgae can be a very advantageous technique. This study aimed to investigate the performance (biomass, growth rates and nutritional composition) of the red macroalgae Gracilaria domingensis, cultivated on weekly nutrient pulses in different proportions of nitrogen and phosphorus. For this study, the algae were exposed to three treatments using nitrogen and phosphorus pulses (N:P), in the proportions of 10:1 (T1), 20:2 (T2) and 50:5 (T3). In all treatments, biomass values showed a significant increase during the experimental period (p < 0.001). When comparing the performance of seaweed between treatments, it can be seen that the highest values were recorded when she was submitted to the lowest pulse concentrations (10:1), especially in the last weeks of cultivation. The RGRs obtained for Gracilaria domingensis, cultivated in treatments T1 and T2 were the ones that indicated the most constant growth patterns throughout the experiment (p>0.05), being considered the highest general means (T1 - 1.16 ± 0.04 %.d1; and T2 - 1.15 ± 0.07 %.d-1). For the control group, there was a significant reduction in these values during cultivation. Combined with the results of biomass and RGR, the success shown by the T1 treatment suggests that the application of N:P pulses, in the lower proportions, is the most appropriate treatment for the cultivation of the seaweed G. domingensis. However, to prove the efficiency of this macroalgae as a resource in human food and, thus, achieve the objectives proposed in this research, it will be necessary to evaluate whether there was an improvement in the nutritional composition of algae submitted to different nutrient pulses (under analysis).

BANKING MEMBERS:
Presidente - 1279472 - ELIANE MARINHO SORIANO
Interno - 1149351 - JORGE EDUARDO LINS OLIVEIRA
Externa à Instituição - MARIANA SANTANA SANTOS PEREIRA DA COSTA - IFRN