Banca de DEFESA: OTÁVIO DE SENA MONTE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : OTÁVIO DE SENA MONTE
DATE: 20/02/2025
TIME: 09:00
LOCAL: Google Meet (meet.google.com/bpg-qqdi-tka)
TITLE:

When Origin Matters: Temporal Intensification of Land Use in the Catchments of Lakes and Reservoirs Varies Inversely with Distance from Their Shores

KEY WORDS:

Deforestation; Land cover; Land-use classification; Semi-arid; Shallow lakes; Watersheds

PAGES: 34
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Land-use change is a major driver of terrestrial and aquatic ecosystem transformations, affecting carbon fluxes, biodiversity, and ecosystem services worldwide. Understanding catchment land-use dynamics is critical, as these areas are shaped by several socio-environmental factors. However, whether and how the ecosystem origin and the distance from the shore influence catchment land-use dynamics remains limited. This study investigates the spatiotemporal land-use dynamics in 98 tropical catchments, encompassing natural lakes and reservoirs in northeast Brazil. For this, we used the MapBiomas Land-Use/Land-Cover Collection (1985–2022). The land-use dynamics (LUd) were depicted by a composite variable derived from principal component analysis (PCA) scores, which incorporated the current relative extent of land use, the land-use change rate, and long-term land-use trends. We hypothesized that: i) LUd is greater in reservoir catchments; ii) LUd increases with greater distance from the shore, in both lake and reservoir catchments; and iii) the distance-mediated increase in LUd is stronger in reservoir catchments. Using regression tree analysis (RTA), we explored how demographic and catchment characteristics influence the spatiotemporal land-use index (SLUi), calculated as the effect sizes (Fisher’s z) of LUd as a function of distance from the shore. Our results reveal that LUd is more intense in lake catchments and differs significantly between lake and reservoir catchments: LUd increases with distance in lakes but decreases in reservoirs. This suggests that areas closer to lakes are more effectively protected than those further away, whereas in reservoir catchments, headwater regions are less impacted than areas closer to the reservoir shores. Human population size, slope, longitude, and catchment area are the key land-use predictors in the studied catchments irrespective of the ecosystem origin. These findings provide new insights into the mechanisms driving land-use dynamics in catchments of tropical ecosystems, highlighting the importance of considering ecosystem origin as a predictor of catchment land-use dynamics.

COMMITTEE MEMBERS:
Presidente - 1714892 - ADRIANO CALIMAN FERREIRA DA SILVA
Interna - 1434166 - LUCIANA SILVA CARNEIRO
Externo à Instituição - RAFAEL DETTOGNI GUARIENTO - UFMS