Scientific output

This dataset shows the extent of mangroves along the entire Guyanese coastline in 2025. This can be visualised and estimated based on the area, expressed in hectares, of several hundred mangrove polygons (MangArea field). Coastal mangroves can be distinguished from estuarine mangroves using the CoastType field. The delineated areas either correspond to patches of forest with varying degrees of canopy closure, or to the outlines of individual tree canopies.

A quality-controlled, 10-year (2015–2025) biogeochemical dataset was published for the Saigon-Dong Nai River-estuary continuum in Ho Chi Minh City, Vietnam, addressing a critical observational gap in tropical Southeast Asia. The observing program couples a biweekly time series at four fixed stations with seasonal longitudinal transects across 27 sites, encompassing over 19,800 observations of physical parameters, nutrients, organic carbon, and chlorophyll-a.

The proximate controls on phytoplankton blooms and carbon dynamics were investigated in the eutrophic, wastewater-impacted Saigon River Estuary (Ho Chi Minh City, Vietnam) using a transient 1D reactive-transport model (C-GEM) evaluated against 24 months of monitoring data.

7th Mangrove Macrobenthos and Management Conference (MMM7)

IMPROVING THE FINE-SCALE CHARACTERIZATION OF THE STRUCTURAL DIVERSITY OF MANGROVE FORESTS IN FRENCH GUIANA TO REFINE CARBON MAPPING

By Quentin Marsal (1,3), Christophe Proisy (1,2), Thibault Catry (3,4), Elodie Blanchard (3), Maxime Dutour (1,2) and Jean-Luc Maeght (1)

1: IRD UMR AMAP, Montpellier, France

2: IRD UMR AMAP, Cayenne, French Guiana, France

3: IRD UMR ESPACE-DEV, Montpellier, France

4: KHEOBS Laboratory, Phnom Penh, Cambodia

• Dissolved organic carbon content is higher in deeper soil layers.
• The deep dissolved organic matter is older and more humified than at the surface.
• The vertical gradients studied are amplified during neap tides.
• Cr and Mn follow the dissolved organic carbon vertical gradient.
• Ni and Mo follow an opposite vertical gradient to dissolved organic carbon.

Estuaries exchange greenhouse gases with the atmosphere and can either potentially warm or cool the climate. Most studies focus on CO2, but other gases such as CH4 and N2O can also be important. In several tropical deltas, mixing between river water and sea water can lower CO2 levels, leading these systems to act as CO2 sinks even without biological uptake. Here, we measured air‐water CH4 and N2O fluxes in a tropical estuarine delta in Brazil and combined these data with CO2 flux measurements collected at the same time and locations.