Banca de DEFESA: JANAÍNA TAVARES DE OLIVEIRA TEIXEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JANAÍNA TAVARES DE OLIVEIRA TEIXEIRA
DATE: 29/09/2022
TIME: 16:00
LOCAL: Sala Google Meet
TITLE:

Variation of phycoperiphytic communities in experimental fish ponds with aquaponics system in Western Pará

KEY WORDS:

Algae, Amazon, ammonia, hydroponic, periphyton

PAGES: 40
BIG AREA: Ciências Biológicas
AREA: Biologia Geral
SUMMARY:

Periphytic communities are of fundamental importance, essential to the balance and metabolism of aquatic environments, they are the base of the food chain and primary producers responsible for releasing oxygen to the environment. The aim of this study was to determine the variation of phycoperiphytic communities in experimental fish farming ponds, comparing ponds with and without hydroponics. The study took place at the external facility of the Federal University of Oeste do Pará, in the city of Oriximiná-Pará, for four months. Four experimental fish farming tanks with aquaponics system, two Treatment tanks (TA; TB) containing hydroponics with the species Acmella oleracea (L.) R. K. Jansen (Jambú) and two Control tanks (CA; CB) without hydroponics were installed. For periphyton sampling, artificial substrates with dimensions (area) of 10 x 5 cm were used. A set of three substrates was inserted into each tank, which remained for a period of 30 days for colonization. After this period, the periphytic material was scraped off, fixed with 1% Lugol and stored with approximately 100 ml of distilled water. Phycoperiphyton quantification was performed using sedimentation chambers under an inverted microscope. The phycoperiphytic community was classified at taxonomic class level, density calculations, ANOVA+Tukey and diversity indices (Shannon-Wiener), equitability and dominance were applied. Abiotic parameters were sampled weekly using portable devices (SensoDirect-150; Secchi disk and photometer). The results showed that the classes Chlorophyceae, Bacillariophyceae and Cyanophyceae constituted respectively 84%, 8% and 8% of the phycoperiphytic component of the treatment tanks. For the Control tanks, the classes Chlorophyceae, Bacillariophyceae and Cyanophyceae constituted respectively 69%, 21% and 10%. The highest total algal density values were identified in the Treatment tanks, however, ANOVA showed that the density data did not differ significantly between the Treatment and Control tanks (p= 0.1274). Shannon's index presented the values; 1,303 (Treatment tanks) and 1,502 (Control tanks). The dominance values were; 0.3352 (Treatment tanks) and 0.2561 (Control tanks). The evenness values were 0.7271 (Treatment tanks) and 0.7719 (Control tanks). For the abiotic data, the ANOVA results showed that there was no significant difference between the Treatment and Control tanks for most of the analyzed parameters, with the exception of water transparency and nitrite, which showed p<0.05 between Treatment and Control. The conclusion is that the hydroponics with Acmella Oleracea did not cause alterations in the density of periphytic algae in this experimental cultivation system, as well as most of the abiotic parameters, the differences occurred only for the diversity indices and for the transparency of water and nitrite. Probably the size of the Jambú hydroponic beds and the amount inserted in them were not enough to cause significant changes in the density of phycoperiphytic algae and in the abiotic parameters oxygen, pH, temperature and electrical conductivity and ammonia.

BANKING MEMBERS:
Presidente - 2391001 - DAVIA MARCIANA TALGATTI
Interno - 2394508 - GUSTAVO HALLWASS
Externo ao Programa - 1254701 - VINICIUS JOSE GIGLIO FERNANDES