Carbon and nitrogen isotopic compositions (δ¹³C and δ¹⁵N, ‰) of S. senilis (n=179) collected at 2 seasons and 4 stations located along the Sine Saloum delta, Senegal. The ellipses at the 95% confidence interval of the bivalves are represented by colors varying according to the stations (blue for station 1, yellow for station 2, red for station 3, and green for station 4), and the shape of the points varies according to the season (empty circles for April and full squares for October).