Banca de DEFESA: ELOI BISPO BEZERRA NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELOI BISPO BEZERRA NETO
DATE: 14/07/2023
TIME: 14:00
LOCAL: meet.google.com/yxc-ords-hzz
TITLE:

SPATIAL AND SEASONAL EFFECTS ON FISH ASSEMBLAGES OF EDGE RIVERS IN THE SOUTHWEST OF THE AMAZON BASIN

KEY WORDS:

Abundance Index. Species Richness. River Continuum Concept. Flood Pulse Concept

PAGES: 25
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

This study evaluated the seasonal, spatial and limnilogical aspects that influence the distribution of fish assemblages along the São Miguel River, in the southwest of the Amazon Basin, Brazil. The results indicated the existence of spatial effects, with differences in the fish populations in the headwaters, intermediate section and at the mouth of the river, PERMANOVA (F = 2.059, df = 2, 16, p = 0.001), seasonal differences between the high- and low-water periods (F = 3.331, df = 1, 16, p = 0.001), and with the effect of spatial and seasonal interaction (F = 1.606, df = 2, 16, p = 0.012). There were also significant differences (RDA) in the composition of the fish assemblages in the different regions, considering the pH values (F = 1.417, p = 0.059) and electrical conductivity (F = 1.363, p = 0.086), but there was no effect for dissolved oxygen (F = 1.261, p = 0.152) and temperature (F = 1.339, p = 0.103). These results indicate that the differences observed in the organizational composition of the fish assemblages sampled along the São Miguel River are distributed in a longitudinal gradient, which is linked to the structural particularities of the environment, such as the presence or absence of vegetation cover, width, depth, climate and seasonality of the waters. These are factors that characterize a different pattern for the behavior and distribution of aquatic biota in the rivers existing in the region of the basin’s edge when compared to those found in the floodplains in the central part of the Amazon basin where the flood pulse is the main controller of aquatic biota.

COMMITTEE MEMBERS:
Presidente - 1692690 - RANIERE GARCEZ COSTA SOUSA
Externo ao Programa - 3122885 - DONOVAN FILIPE HENRIQUE PINTO - UNIRExterno à Instituição - AMAZONINO LEMOS DE CASTRO - UFAM
Externo à Instituição - DIEGO MAIA ZACARDI - UFOPA