Nematode trophic structure differed significantly among lagoon typologies. While closed lagoons were largely dominated by predator/omnivores (mean of 54%), in ICOLLs and open lagoons nonselective deposit feeders and epigrowth feeders were significantly more abundant (mean of 39% and 32% respectively) (Fig 4 and S5 Table). Selective deposit feeders (with a mean around 16%) did not differ significantly among typologies (S5 Table). Abundances of vascular plant feeders significantly decreased with openness (Fig 4, S5 and S6 Tables). The index of trophic diversity was significantly lower in closed lagoons, intermediate in ICOLLs and higher in the open lagoons (Fig 4 and Table 2). Significant variations in trophic diversity among lagoons within individual typology and at scale of locations within the lagoon were not detected (Table 2).