Banca de QUALIFICAÇÃO: PEDRO PAULO SOUZA LOPES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : PEDRO PAULO SOUZA LOPES
DATE: 18/09/2025
TIME: 08:00
LOCAL: Google Meet (http://meet.google.com/srx- xihq-ocu)
TITLE:

Disentangling species-area relationship of aquatic invertebrates in non-perennial rivers: a macroecological approach.

 

KEY WORDS:

Metacommunity properties; Land use and land cover change; Flow intermittence; Species abundance distribution; Intraspecific aggregation; Scale-dependent effects

 

PAGES: 40
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Globally, rivers are facing rapid biodiversity loss due to human impacts, such as land cover conversion and increased flow intermittence associated with climate change. However, the effect of those stressors on river ecosystems are often scale-dependent, which can generate controversy among studies conducted at different spatial scales. Thus, the Species-Area Relationship (SAR) is a powerful tool to investigate scale-dependent effects of stressors on biodiversity. Here, we investigate whether, how and by which metacommunity properties (intraspecific aggregation, species abundance distribution, number of individuals and regional species pool) land use and land cover changes and flow intermittence bends the shape of SAR for river invertebrate metacommunities. In the first chapter we used a large database of southeastern France containing 54 metacommunities. As hypothesized, we found that both stressors reduce the intercept and increase the steepness of SAR by similar mechanisms, thus, local diversity loss might be compensated by regional heterogeneity among non-perennial river reaches. Yet, for urbanized land cover, the regional species pool is lower even with this trade-off, resulting in consistent diversity loss across scales. Our results indicate the need for tailored conservation strategies to protect and restore riverine ecosystems composed of non-perennial reaches in the face of global change while considering multiple spatial scales. For the second chapter, we aim to apply a similar methodology to Caatinga rivers, and expect to find similar results.

 

COMMITTEE MEMBERS:
Interno - 1714892 - ADRIANO CALIMAN FERREIRA DA SILVA
Presidente - 3060333 - ANDROS TAROUCO GIANUCA
Interno - 1678202 - CARLOS ROBERTO SORENSEN DUTRA DA FONSECA
Externa à Instituição - MARIE-CHRISTINE RUFENER