Banca de QUALIFICAÇÃO: GABRIELA NERES DE OLIVEIRA E SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : GABRIELA NERES DE OLIVEIRA E SILVA
DATE: 06/11/2025
TIME: 13:00
LOCAL: SALA DE REUNIOES DO DECOL
TITLE:

Effects of Land Use and Flow Intermittence on the components of Beta Diversity in stream macroinvertebrate metacommunities

KEY WORDS:

local contribution to beta diversity; species turnover; richness difference; context dependency; aquatic macroinvertebrate; temporal variation

PAGES: 28
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Freshwater ecosystems harbor a high biodiversity that is threatened by climate change and human pressures. In river ecosystems, these threats are increasing the proportion of intermittent rivers and ephemeral streams. These rivers alternate between flowing, pool, and dry phases, supporting regional biodiversity through communities adapted to hydrological variability. However, more frequent and severe droughts are undermining community resilience, decreasing local diversity and changing species composition. Furthermore, land conversion for agriculture, pasture, and urbanization alters river hydrology. Therefore, the primary objective of this study is to investigate how flow intermittence and land use influence the structure of aquatic macroinvertebrate metacommunities by interpreting the components of beta diversity (species turnover and richness difference) using the Local Contribution to Beta Diversity (LCBD) metric. In the first chapter, 9 river metacommunities from southeastern France were investigated. In the results, land use, flow intermittence and stream order were important predictors related to species turnover; however, each metacommunity showed a different pattern, revealing context dependency. As for the richness difference component, land use was the most prominent predictor in most metacommunities. From this, it was observed that more preserved areas harbor assemblages with a more unique species composition, thus representing priority areas for conservation. To expand the study of these systems, the second chapter aims to investigate temporal variation in functional LCBD across metacommunities.

COMMITTEE MEMBERS:
Interno - 1837921 - ALEXANDRE FADIGAS DE SOUZA
Presidente - 3060333 - ANDROS TAROUCO GIANUCA
Interno - 1678202 - CARLOS ROBERTO SORENSEN DUTRA DA FONSECA
Externa ao Programa - ***.618.874-** - MARIE-CHRISTINE RUFENER - UFRN