Banca de DEFESA: VICTOR ROCHA DI CAVALCANTI

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : VICTOR ROCHA DI CAVALCANTI
DATE: 26/02/2024
TIME: 14:00
LOCAL: Sala de Reuniões
TITLE:

Land-use and flow intermittence influence biodiversity-stability relationships across spatial scales: implications for an uncertain future

KEY WORDS:

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

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

Global change and associated increasing anthropogenic pressures on Earth are impacting biodiversity locally, regionally and globally, with 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 macroinvertebrate 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. We found that urbanization and agriculture 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 aerial organisms responded strongly to urbanization, 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 rivers, implying the need to conserve multiple sites to attain regional stability in those systems. Considering that climate change is increasing flow intermittence across river networks, our results suggest that managers need to focus on the spatial dynamics of metacommunities more than on local-scale processes to monitor, restore and conserve freshwater biodiversity.

COMMITTEE MEMBERS:
Externo à Instituição - VICTOR SATORU SAITO - UFSCAR
Interno - 1714892 - ADRIANO CALIMAN FERREIRA DA SILVA
Presidente - 3060333 - ANDROS TAROUCO GIANUCA