Sediment organic carbon stocks were similar among four species compositions in a tropical seagrass meadow
Fecha
2022
Tipo
artículo original
Autores
Samper Villarreal, Jimena
Mazarrasa, Inés
Masqué, Pere
Serrano, Oscar
Cortés Núñez, Jorge
Título de la revista
ISSN de la revista
Título del volumen
Editor
Resumen
Seagrass meadows composed of larger species are assumed to store larger sediment organic carbon (Corg)
stocks, storing more Corg in their tissues and larger leaves promoting greater burial of seagrass and non-seagrass
Corg. However, the influence of species composition on sediment Corg stocks remains poorly understood mainly
from challenges in isolating it from confounding factors. We assessed Corg stocks in seagrass biomass and sediment of four species compositions in a tropical Caribbean meadow. We hypothesized that larger species would
lead to higher sediment Corg stocks, within a limited geomorphic setting and time frame. Seagrass biomass and
surficial and sediment profiles were collected to measure seagrass morphometrics, δ13C and δ15N, dry bulk density, Corg and inorganic carbon (Cinorg) stocks, and grain size. Seagrass biomass Corg stocks ranged from 0.04 to
3.7 Mg ha 1
, with higher biomass Corg stocks in compositions with larger species. Surficial sediment Corg and
Cinorg stocks (to 1.5 cm) averaged 2.6 0.6 Mg Corg ha 1 and 68.8 14.6 Mg Cinorg ha 1
, respectively, and did
not vary among species compositions. Isotopic analyses revealed a 50% contribution of seagrasses to surficial
sediment Corg in compositions with larger species, compared to a contribution of 35% for those of smaller
species. This study provides novel blue carbon data from an understudied region and contributes to understanding the role of seagrass species composition on sediment carbon storage.
Descripción
Palabras clave
Marine biodiversity, Tropical seagrass, Organic carbon, Sediment, BIOLOGÍA MARINA