RT journal article
T1 Seagrass Patch Complexity Affects Macroinfaunal Community Structure in Intertidal Areas: An In Situ Experiment Using Seagrass Mimics
A1 Brun Murillo, Fernando Guillermo
A1 Cobo-Díaz, José F.
A1 González-Ortiz, Vanesa
A1 Varela Fuentes, José Luis
A1 Pérez Lloréns, José Lucas
A1 Vergara Oñate, Juan José
A2 Biología
K1 diversity
K1 ecosystem engineers
K1 facilitation
K1 edge effect
K1 seagrass
K1 hydrodynamics
K1 food availability
K1 stable isotopes
K1 mimics
AB Seagrasses, as key ecosystem engineers in coastal ecosystems, contribute to enhancing diversity in comparison with nearby bare areas. It has been proved mainly for epifauna, but data on infauna are still scarce. The present study addresses how seagrass structural complexity (i.e., canopy properties) affects the diversity of infaunal organisms inhabiting those meadows. Canopy attributes were achieved using seagrass mimics, which were used to construct in situ vegetation patches with two contrasting canopy properties (i.e., shoot density and morphology) resembling the two seagrass species thriving in the inner Cadiz Bay: Zostera noltei and Cymodocea nodosa. After three months, bare nearby areas, two mimicked seagrass patches ('Zostera' and 'Cymodocea'), and the surrounding natural populations of Zostera noltei were sampled in a spatially explicit way. Shifts in organism diets were also determined using N-15 and C-13 analyses in available food sources and main infaunal organisms, mixing models, and niche metrics (standard ellipse area). Seagrass-mimicked habitats increased the species richness (two-fold), organism abundance (three to four times), and functional diversity compared with bare nearby areas. The clam Scrobicularia plana (deposit/filter feeder) and the worm Hediste diversicolor (omnivore) were dominant in all of the samples (> 85%) and showed an opposite spatial distribution in the reconstructed patches: whilst S. plana accumulated in the outer-edge parts of the meadow, H. diversicolor abounded in the center. Changes in the isotopic signature of both species depending on the treatment suggest that this faunal distribution was associated with a shift in the diet of the organisms. Based on our results, we concluded that facilitation processes (e.g., reduction in predation and in bioturbation pressures) and changes in food availability (quality and quantity) mediated by seagrass canopies were the main driving forces structuring this community in an intertidal muddy area of low diversity.
PB MDPI
SN 1424-2818
YR 2021
FD 2021-11
LK http://hdl.handle.net/10498/27249
UL http://hdl.handle.net/10498/27249
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026