Lira A. S., Lucena-Fredou F., Ménard Frédéric, Fredou T., Gonzalez J. G., Ferreira V., Rosa J. S., Munaron Jean-Marie, Le Loc'h François. (2021). Trophic structure of a nektobenthic community exploited by a multispecific bottom trawling fishery in Northeastern Brazil. PLoS One, 16 (2), e0246491 [18 p.]. ISSN 1932-6203.
Titre du document
Trophic structure of a nektobenthic community exploited by a multispecific bottom trawling fishery in Northeastern Brazil
Année de publication
2021
Auteurs
Lira A. S., Lucena-Fredou F., Ménard Frédéric, Fredou T., Gonzalez J. G., Ferreira V., Rosa J. S., Munaron Jean-Marie, Le Loc'h François
Source
PLoS One, 2021,
16 (2), e0246491 [18 p.] ISSN 1932-6203
We used complementary stable isotope (SIA) and stomach content (SCA) analyses to investigate feeding relationships among species of the nektobenthic communities and the potential ecological effects of the bottom trawling of a coastal ecosystem in northeastern Brazil. Carbon (delta C-13) and nitrogen (delta N-15) compositions were determined for five basal sources and 28 consumers, from zooplankton to shrimp and fish species. Fishes and basal sources showed a broad range of delta N-15 (fishes: 6.49-14.94 parts per thousand; sources: 2.58-6.79 parts per thousand) and delta C-13 values (fishes: -23.86 to -13.71 parts per thousand; sources: -24.32 to -13.53 parts per thousand), while shrimps and crabs exhibited similar nitrogen and carbon ratios. Six trophic consumer groups were determined among zooplankton, crustaceans and fishes by SIA, with trophic pathways associated mostly with benthic sources. SCA results indicated a preference for benthic invertebrates, mainly worms, crabs and shrimps, as prey for the fish fauna, highlighting their importance in the food web. In overall, differences between SCA and the SIA approaches were observed, except for groups composed mainly for shrimps and some species of high delta N-15 values, mostly piscivorous and zoobenthivores. Given the absence of regulation for bottom trawling activities in the area, the cumulative effects of trawling on population parameters, species composition, potentially decreasing the abundance of benthic preys (e.g., shrimps, worms and crabs) may lead to changes in the trophic structure potentially affect the food web and the sustainability of the fishery.
Plan de classement
Limnologie biologique / Océanographie biologique [034]
;
Ressources halieutiques [040]
Description Géographique
BRESIL ; ATLANTIQUE
Localisation
Fonds IRD [F B010081080]
Identifiant IRD
fdi:010081080
