Banca de DEFESA: Glênia Nunes de Mello

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Glênia Nunes de Mello
DATE: 29/05/2023
TIME: 10:00
LOCAL: Meio virtual
TITLE:

Strategies for monitoring the zooplankton community before and after construction of a Small Hydroelectric Plant in the Cerrado biome

KEY WORDS:

Verdão River; Reservoir; Biomonitoring; Taxonomic resolution; Substitute groups; Numerical resolution.

PAGES: 46
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

The construction of water reservoirs causes different types of pressures on the environment from the loss of chemical and biological quality of water and the loss of biodiversity in freshwater systems, causing changes in ecosystem processes and in the structure of aquatic communities, sufficient to consider the reservoirs as “new ecosystems”.These hydrological changes are reflected in the aquatic biota, affecting the different trophic levels of the zooplankton community, which is composed of organisms that respond quickly to environmental conditions. Therefore, for the optimization of longterm biomonitoring programs and wide spatial coverage, it is important to test the reliability of different cost reduction strategies, such as surrogate groups, taxonomic sufficiency and numerical sufficiency. Using information about the spatial structure of the zooplankton community over a long time scale, our objective was to test whether these optimization strategies could be applied to increase the efficiency of biomonitoring programs in hydroelectric reservoirs. Zooplankton data were collected in the Ypê Small Hydroelectric Power Plant reservoir, on the Verdão River, Goiás, Brazil, in the pre-operation and operation phases, between 2014 and 2020. The data were organized in different formats: taxonomic groups ( microcrustaceans, rotifers and testaceous amoebae), taxonomic resolution (species, genera and families matrices) and numerical resolution (data on abundance and presence/absence of species). The ordering patterns obtained with Principal Coordinate Analysis (PCoA) for the different matrices were compared using Procrustes analyses. Our results suggest that there are not enough consistent relationships between the biological matrices of the different zooplanktonic groups to suggest sampling only one (or some) of the groups in both pre-operation and operation phases. We found evidence supporting the use of the highest taxonomic approaches in biomonitoring programs for all groups studied in both the pre-operation and operation phases. Sorting patterns using presence/absence data were similar to those obtained from abundance data. We conclude that a zooplankton community monitoring program at PCH Ypê could be improved by replacing identification at the genus or family level, instead of species, for microcrustaceans and rotifers. Furthermore, it would also be possible to use presence/absence data to replace abundance data for all zooplanktonic groups.

BANKING MEMBERS:
Externa à Instituição - Priscilla de Carvalho - UFG
Presidente - 1524495 - LUDGERO CARDOSO GALLI VIEIRA
Interna - 2476936 - MARINA REGINA FRIZZAS
Interno - 1334398 - RICARDO BOMFIM MACHADO