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♦ ¹Food of an endangered cyprinodont (Aphanius iberus): ontogenetic diet shift and prey electivity, Carles Alcaraz & Emili García-Berthou, Environmental Biology of Fishes (2007) 78:193–207
♦ ²Energy flow of a boreal intertidal ecosystem, the Sylt-Rømø Bight, Dan Baird, Harald Asmus, Ragnhild Asmus, Mar Ecol Prog Ser 279: 45–61, 2004