Banca de QUALIFICAÇÃO: VICTOR ROCHA DI CAVALCANTI

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : VICTOR ROCHA DI CAVALCANTI
DATE: 11/09/2023
TIME: 13:00
LOCAL: Google Meet (meet.google.com/mif-nnpo-got)
TITLE:

Land-Use and Flow Intermittence Effects on Biodiversity-Stability Relationships Across Spatial Scales

KEY WORDS:

Land-use; Biodiversity; Intermittence flow; Regional stability; Local stability;Spatial Asynchorony;

PAGES: 48
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Land-use changes associated with urbanization and agriculture can impact biodiversity locally, regionally and globally, with potential negative consequences on the stability of ecosystems. However, the majority of studies on biodiversity-stability relationships have been conducted locally. Only recently it has been proposed that such relationships could become decoupled across spatial scales. Spatial decoupling happens when many local communities are unstable, but they vary asynchronously in space, leading to regional stabilization. Spatial decoupling can thus result in misleading interpretation of local scale stability patterns when the goal is to design regional management strategies. Focusing on multiple metacommunities of French rivers experiencing contrasting levels of flow intermittence, we investigate (i) whether and how land-use influences  acroinvertebrate diversity and stability across multiple spatial scales and (ii) whether connectivity loss due to increasing intermittence enhances the relative stabilizing force of spatial asynchrony over local stability, resulting in higher spatial decoupling of diversity-stability relationships. Overall, we found that land-use negatively influenced local species diversity and the spatial asynchrony of populations and communities, indirectly reducing the stability of metacommunities through different pathways. However, the significance and strength of those pathways changed depending on the intermittence level and organism group analyzed. Specifically, the diversity of insects responded strongly to land-use, whereas the diversity of aquatic species did not. In addition, the relative contribution of spatial asynchrony to regional stability was higher for metacommunities of intermittent than perennial sites, implying the need to conserve multiple sites to attain regional stability in those systems. Considering predictions of increasing flow intermittence due to climate change, our results suggest that managers seeking to enhance regional stability will increasingly need to focus on the spatial dynamics of metacommunities instead of relying on local scale processes. Our study also indicates the need to mitigate impacts of urbanization and agriculture to increase diversity and stability of insects, both locally and regionally.

COMMITTEE MEMBERS:
Presidente - 3060333 - ANDROS TAROUCO GIANUCA
Interno - 1362202 - JOSE LUIZ DE ATTAYDE
Interno - 1103317 - KEMAL ALI GER