FN Archimer Export Format PT J TI Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis BT AF Guazzelli Gonzalez, Julio Ménard, Frédéric Le Loc'h, François Agrelli de Andrade, Humber Pontes Viana, Andréa Ferreira, Valdimere Frédou, Flávia Lucena Lira, Alex Souza Munaron, Jean-Marie Frédou, Thierry AS 1:1;2:2;3:3;4:1;5:1;6:1;7:1;8:1;9:3;10:1; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:; C1 Universidade Federal Rural de Pernambuco, UFRPE, Departamento de Recursos Pesqueiros e Aquicultura, Rua Dom Manuel de Medeiros, s/n, Recife, PE. CEP: 52.171-900, Brazil Aix Marseille Univ, Univ Toulon, CNRS, IRD, MIO, UM110, Marseille, France IRD, Laboratoire des Sciences de L'Environnement Marin, UMR 6539, CNRS, UBO, IRD, Ifremer, 29280, Plouzané, France C2 UNIV FED RURAL PERNAMBUCO UFRPE, BRAZIL UNIV AIX MARSEILLE, FRANCE IRD, FRANCE UM LEMAR IN WOS Cotutelle UMR copubli-france copubli-univ-france copubli-int-hors-europe copubli-sud IF 2.333 TC 15 UR https://archimer.ifremer.fr/doc/00506/61767/65745.pdf LA English DT Article DE ;Brackish water fish;Trophic relationships;Carbon;Nitrogen;Centropomus AB We investigated the trophic niches and the resource partitioning of two snook species, the common (Centropomus undecimalis) and the fat snook (C. parallelus), in four tropical estuaries of the northeastern Brazil, using stable isotope analyses of carbon (δ13C) and nitrogen (δ15N). Fish specimens, mainly juveniles, basal resources and a primary consumer were collected in 2015 during dry and rainy seasons in all estuaries, which exhibited differences in system size, geomorphologic shapes, levels of sea access and anthropic pressures. Potential effect of factors like fish body length, estuary and seasonality on isotope ratios were investigated. Positive relationships between the size of fish and δ15N values were found, regardless the species. Our results indicated that snooks can be characterized as secondary consumers and have close trophic niches in most estuaries. Trophic overlaps were more pronounced within the largest estuaries (Catuama and Santa Cruz), whereas smaller systems that have restricted connections to the sea presented low isotopic niche overlap between both species (Suape and Sirinhaém). Moreover, a higher variability of δ13C and δ15N values in snooks was found in larger estuaries undergoing stronger influences from coastal adjacent waters. Although we were not able to detect clear seasonal effects, greater isotopic overlaps were found during the rainy season. Despite the lack of intrinsic differences in life history traits, both species, dominated by juveniles, shared similar trophic niches in these environments. PY 2019 PD OCT SO Estuarine Coastal And Shelf Science SN 0272-7714 PU Elsevier BV VL 226 UT 000482495700025 DI 10.1016/j.ecss.2019.106287 ID 61767 ER EF